feat: add turn streaming and inspector updates

CLAUDE.md

@@ -24,6 +24,7 @@ Research on how different agents operate (CLI flags, streaming formats, HITL pat
 Universal schema guidance:
 - The universal schema should cover the full feature set of all agents.
 - Conversions must be best-effort overlap without being lossy; preserve raw payloads when needed.
+- **The mock agent acts as the reference implementation** for correct event behavior. Real agents should use synthetic events to match the mock agent's event patterns (e.g., emitting both daemon synthetic and agent native `session.started` events, proper `item.started` → `item.delta` → `item.completed` sequences).
 
 ## Spec Tracking
 
@@ -54,6 +55,7 @@ Universal schema guidance:
 - `sandbox-agent sessions list` ↔ `GET /v1/sessions`
 - `sandbox-agent sessions create` ↔ `POST /v1/sessions/{sessionId}`
 - `sandbox-agent sessions send-message` ↔ `POST /v1/sessions/{sessionId}/messages`
+- `sandbox-agent sessions send-message-stream` ↔ `POST /v1/sessions/{sessionId}/messages/stream`
 - `sandbox-agent sessions events` / `get-messages` ↔ `GET /v1/sessions/{sessionId}/events`
 - `sandbox-agent sessions events-sse` ↔ `GET /v1/sessions/{sessionId}/events/sse`
 - `sandbox-agent sessions reply-question` ↔ `POST /v1/sessions/{sessionId}/questions/{questionId}/reply`

README.md

@@ -150,6 +150,7 @@ Create a session and send a message:
 ```bash
 sandbox-agent sessions create my-session --agent codex --endpoint http://127.0.0.1:2468 --token "$SANDBOX_TOKEN"
 sandbox-agent sessions send-message my-session --message "Hello" --endpoint http://127.0.0.1:2468 --token "$SANDBOX_TOKEN"
+sandbox-agent sessions send-message-stream my-session --message "Hello" --endpoint http://127.0.0.1:2468 --token "$SANDBOX_TOKEN"
 ```
 
 Docs: https://rivet.dev/docs/cli

docs/architecture.mdx

@@ -105,6 +105,7 @@ Each session tracks:
 POST /v1/sessions/{sessionId}     Create session, auto-install agent
         ↓
 POST /v1/sessions/{id}/messages   Spawn agent subprocess, stream output
+POST /v1/sessions/{id}/messages/stream   Post and stream a single turn
         ↓
 GET /v1/sessions/{id}/events      Poll for new events (offset-based)
 GET /v1/sessions/{id}/events/sse  Subscribe to SSE stream
@@ -133,16 +134,30 @@ When a message is sent:
 
 ## Agent Execution
 
-Each agent has a different execution model and communication pattern.
+Each agent has a different execution model and communication pattern. There are two main architectural patterns:
+
+### Architecture Patterns
+
+**Subprocess Model (Claude, Amp):**
+- New process spawned per message/turn
+- Process terminates after turn completes
+- Multi-turn via CLI resume flags (`--resume`, `--continue`)
+- Simple but has process spawn overhead
+
+**Client/Server Model (OpenCode, Codex):**
+- Single long-running server process
+- Multiple sessions/threads multiplexed via RPC
+- Multi-turn via server-side thread persistence
+- More efficient for repeated interactions
 
 ### Overview
 
-| Agent | Execution Model | Binary Source | Session Resume |
-|-------|-----------------|---------------|----------------|
-| Claude Code | CLI subprocess | GCS (Anthropic) | Yes (`--resume`) |
-| Codex | App Server subprocess (JSON-RPC) | GitHub releases | No |
-| OpenCode | HTTP server + SSE | GitHub releases | Yes (server-side) |
-| Amp | CLI subprocess | GCS (Amp) | Yes (`--continue`) |
+| Agent | Architecture | Binary Source | Multi-Turn Method |
+|-------|--------------|---------------|-------------------|
+| Claude Code | Subprocess (per-turn) | GCS (Anthropic) | `--resume` flag |
+| Codex | **Shared Server (JSON-RPC)** | GitHub releases | **Thread persistence** |
+| OpenCode | HTTP Server (SSE) | GitHub releases | Server-side sessions |
+| Amp | Subprocess (per-turn) | GCS (Amp) | `--continue` flag |
 
 ### Claude Code
 
@@ -161,15 +176,25 @@ claude --print --output-format stream-json --verbose \
 
 ### Codex
 
-Spawned as a subprocess using the App Server JSON-RPC protocol:
+Uses a **shared app-server process** that handles multiple sessions via JSON-RPC over stdio:
 
 ```bash
 codex app-server
 ```
 
-- JSON-RPC over stdio (JSONL)
-- Uses `initialize`, `thread/start`, and `turn/start` requests
-- Approval requests arrive as server JSON-RPC requests
+**Daemon flow:**
+1. First Codex session triggers `codex app-server` spawn
+2. Performs `initialize` / `initialized` handshake
+3. Each session creation sends `thread/start` → receives `thread_id`
+4. Messages sent via `turn/start` with `thread_id`
+5. Notifications routed back to session by `thread_id`
+
+**Key characteristics:**
+- Single process handles all Codex sessions
+- JSON-RPC over stdio (JSONL format)
+- Thread IDs map to daemon session IDs
+- Approval requests arrive as server-to-client JSON-RPC requests
+- Process lifetime matches daemon lifetime (not per-turn)
 
 ### OpenCode
 
@@ -208,12 +233,21 @@ amp [--execute|--print] [--output-format stream-json] \
 
 ### Communication Patterns
 
-**Subprocess agents (Claude, Codex, Amp):**
+**Per-turn subprocess agents (Claude, Amp):**
 1. Agent CLI spawned with appropriate flags
 2. Stdout/stderr read line-by-line
 3. Each line parsed as JSON
 4. Events converted via `parse_agent_line()` → agent-specific converter
 5. Universal events recorded and broadcast to SSE subscribers
+6. Process terminated on turn completion
+
+**Shared stdio server agent (Codex):**
+1. Single `codex app-server` process started on first session
+2. `initialize`/`initialized` handshake performed once
+3. New sessions send `thread/start`, receive `thread_id`
+4. Messages sent via `turn/start` with `thread_id`
+5. Notifications read from stdout, routed by `thread_id`
+6. Process persists across sessions and turns
 
 **HTTP server agent (OpenCode):**
 1. Server started on available port (if not running)

docs/building-chat-ui.mdx

@@ -131,13 +131,15 @@ timestamps, not ordering.
 
 ## Optional raw payloads
 
-If you need provider-level debugging, pass `include_raw=true` when streaming or polling events to
-receive the `raw` payload for each event.
+If you need provider-level debugging, pass `include_raw=true` when streaming or polling events
+(including one-turn streams) to receive the `raw` payload for each event.
 
-## SSE vs polling
+## SSE vs polling vs turn streaming
 
 - SSE gives low-latency updates and simplifies streaming UIs.
 - Polling is simpler to debug and works in any environment.
+- Turn streaming (`POST /v1/sessions/{session_id}/messages/stream`) is a one-shot stream tied to a
+  single prompt. The stream closes automatically once the turn completes.
 
 Both yield the same event payloads.
 

docs/cli.mdx

@@ -67,6 +67,16 @@ sandbox-agent sessions send-message my-session \
 ```
 </details>
 
+<details>
+<summary><strong>sessions send-message-stream</strong></summary>
+
+```bash
+sandbox-agent sessions send-message-stream my-session \
+  --message "Summarize the repository" \
+  --endpoint http://127.0.0.1:2468
+```
+</details>
+
 <details>
 <summary><strong>sessions events</strong></summary>
 

docs/openapi.json

@@ -408,6 +408,60 @@
         }
       }
     },
+    "/v1/sessions/{session_id}/messages/stream": {
+      "post": {
+        "tags": [
+          "sessions"
+        ],
+        "operationId": "post_message_stream",
+        "parameters": [
+          {
+            "name": "session_id",
+            "in": "path",
+            "description": "Session id",
+            "required": true,
+            "schema": {
+              "type": "string"
+            }
+          },
+          {
+            "name": "include_raw",
+            "in": "query",
+            "description": "Include raw provider payloads",
+            "required": false,
+            "schema": {
+              "type": "boolean",
+              "nullable": true
+            }
+          }
+        ],
+        "requestBody": {
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/MessageRequest"
+              }
+            }
+          },
+          "required": true
+        },
+        "responses": {
+          "200": {
+            "description": "SSE event stream"
+          },
+          "404": {
+            "description": "",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ProblemDetails"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
     "/v1/sessions/{session_id}/permissions/{permission_id}/reply": {
       "post": {
         "tags": [
@@ -1431,6 +1485,15 @@
           "daemon"
         ]
       },
+      "TurnStreamQuery": {
+        "type": "object",
+        "properties": {
+          "includeRaw": {
+            "type": "boolean",
+            "nullable": true
+          }
+        }
+      },
       "UniversalEvent": {
         "type": "object",
         "required": [

docs/quickstart.mdx

@@ -70,6 +70,15 @@ curl "http://127.0.0.1:2468/v1/sessions/my-session/events/sse?offset=0" \
   -H "Authorization: Bearer $SANDBOX_TOKEN"
 ```
 
+For a single-turn stream (post a message and get one streamed response):
+
+```bash
+curl -N -X POST "http://127.0.0.1:2468/v1/sessions/my-session/messages/stream" \
+  -H "Authorization: Bearer $SANDBOX_TOKEN" \
+  -H "content-type: application/json" \
+  -d '{"message":"Hello"}'
+```
+
 ## 5. CLI shortcuts
 
 The CLI mirrors the HTTP API:
@@ -78,4 +87,6 @@ The CLI mirrors the HTTP API:
 sandbox-agent sessions create my-session --agent claude --endpoint http://127.0.0.1:2468 --token "$SANDBOX_TOKEN"
 
 sandbox-agent sessions send-message my-session --message "Hello" --endpoint http://127.0.0.1:2468 --token "$SANDBOX_TOKEN"
+
+sandbox-agent sessions send-message-stream my-session --message "Hello" --endpoint http://127.0.0.1:2468 --token "$SANDBOX_TOKEN"
 ```

docs/sdks/typescript.mdx

@@ -86,10 +86,21 @@ for await (const event of client.streamEvents("demo-session", {
 The SDK parses `text/event-stream` into `UniversalEvent` objects. If you want full control, use
 `getEventsSse()` and parse the stream yourself.
 
+## Stream a single turn
+
+```ts
+for await (const event of client.streamTurn("demo-session", { message: "Hello" })) {
+  console.log(event.type, event.data);
+}
+```
+
+This method posts the message and streams only the next turn. For manual control, call
+`postMessageStream()` and parse the SSE response yourself.
+
 ## Optional raw payloads
 
-Set `includeRaw: true` on `getEvents` or `streamEvents` to include the raw provider payload in
-`event.raw`. This is useful for debugging and conversion analysis.
+Set `includeRaw: true` on `getEvents`, `streamEvents`, or `streamTurn` to include the raw provider
+payload in `event.raw`. This is useful for debugging and conversion analysis.
 
 ## Error handling
 

docs/telemetry.mdx

@@ -3,7 +3,7 @@ title: "Telemetry"
 description: "Anonymous telemetry collected by sandbox-agent."
 ---
 
-sandbox-agent sends a small, anonymous telemetry payload on startup to help us understand usage and improve reliability.
+sandbox-agent sends a small, anonymous telemetry payload on startup and then every 5 minutes to help us understand usage and improve reliability.
 
 ## What gets sent
 
@@ -12,6 +12,7 @@ sandbox-agent sends a small, anonymous telemetry payload on startup to help us u
 - Detected sandbox provider (for example: Docker, E2B, Vercel Sandboxes).
 
 Each sandbox gets a random anonymous ID stored on disk so usage can be counted without identifying users.
+The last successful send time is also stored on disk, and heartbeats are rate-limited to at most one every 5 minutes.
 
 ## Opting out
 

frontend/packages/inspector/index.html

@@ -383,7 +383,7 @@
         flex-direction: column;
         border-right: 1px solid var(--border);
         background: var(--surface-2);
-        overflow: hidden;
+        overflow: visible;
       }
 
       .sidebar-header {
@@ -394,12 +394,15 @@
         align-items: center;
         justify-content: space-between;
         flex-shrink: 0;
+        overflow: visible;
       }
 
       .sidebar-header-actions {
         display: flex;
         align-items: center;
         gap: 8px;
+        position: relative;
+        overflow: visible;
       }
 
       .sidebar-icon-btn {
@@ -449,6 +452,53 @@
         background: var(--accent-hover);
       }
 
+      .sidebar-add-menu-wrapper {
+        position: relative;
+      }
+
+      .sidebar-add-menu {
+        position: absolute;
+        top: 30px;
+        right: 0;
+        min-width: 140px;
+        background: var(--surface);
+        border: 1px solid var(--border-2);
+        border-radius: 8px;
+        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
+        padding: 6px;
+        display: flex;
+        flex-direction: column;
+        gap: 4px;
+        z-index: 60;
+      }
+
+      .sidebar-add-option {
+        background: transparent;
+        border: 1px solid transparent;
+        color: var(--text);
+        text-align: left;
+        padding: 6px 8px;
+        border-radius: 6px;
+        font-size: 12px;
+        cursor: pointer;
+        transition: all var(--transition);
+      }
+
+      .sidebar-add-option:hover {
+        background: var(--accent);
+        color: #fff;
+      }
+
+      .sidebar-add-status {
+        padding: 6px 8px;
+        font-size: 11px;
+        color: var(--muted);
+      }
+
+      .sidebar-add-status.error {
+        color: var(--danger);
+      }
+
       .session-list {
         flex: 1;
         overflow-y: auto;
@@ -520,6 +570,10 @@
         font-size: 11px;
       }
 
+      .sidebar-empty.error {
+        color: var(--danger);
+      }
+
       /* Chat Panel */
       .chat-panel {
         display: flex;
@@ -560,6 +614,21 @@
         color: var(--text-secondary);
       }
 
+      .session-agent-display {
+        font-size: 11px;
+        font-weight: 600;
+        color: var(--accent);
+        background: color-mix(in srgb, var(--accent) 18%, transparent);
+        padding: 2px 6px;
+        border-radius: 999px;
+      }
+
+      .panel-header-right {
+        display: flex;
+        align-items: center;
+        gap: 8px;
+      }
+
       .messages-container {
         flex: 1;
         overflow-y: auto;
@@ -947,6 +1016,13 @@
         width: 50px;
       }
 
+      .setup-select-small:disabled,
+      .setup-select:disabled,
+      .setup-input:disabled {
+        opacity: 0.55;
+        cursor: not-allowed;
+      }
+
       .setup-stream-btn {
         display: flex;
         align-items: center;
@@ -973,6 +1049,16 @@
         color: var(--accent);
       }
 
+      .setup-stream-btn:disabled {
+        cursor: default;
+        opacity: 0.6;
+      }
+
+      .setup-stream-btn:disabled:hover {
+        border-color: var(--border-2);
+        color: var(--muted);
+      }
+
       .setup-stream-btn.active {
         background: var(--accent);
         border-color: var(--accent);

frontend/packages/inspector/src/App.tsx

@@ -62,6 +62,12 @@ export default function App() {
   const [agents, setAgents] = useState<AgentInfo[]>([]);
   const [modesByAgent, setModesByAgent] = useState<Record<string, AgentModeInfo[]>>({});
   const [sessions, setSessions] = useState<SessionInfo[]>([]);
+  const [agentsLoading, setAgentsLoading] = useState(false);
+  const [agentsError, setAgentsError] = useState<string | null>(null);
+  const [sessionsLoading, setSessionsLoading] = useState(false);
+  const [sessionsError, setSessionsError] = useState<string | null>(null);
+  const [modesLoadingByAgent, setModesLoadingByAgent] = useState<Record<string, boolean>>({});
+  const [modesErrorByAgent, setModesErrorByAgent] = useState<Record<string, string | null>>({});
 
   const [agentId, setAgentId] = useState("claude");
   const [agentMode, setAgentMode] = useState("");
@@ -75,10 +81,12 @@ export default function App() {
   const [events, setEvents] = useState<UniversalEvent[]>([]);
   const [offset, setOffset] = useState(0);
   const offsetRef = useRef(0);
+  const [eventsLoading, setEventsLoading] = useState(false);
 
   const [polling, setPolling] = useState(false);
   const pollTimerRef = useRef<number | null>(null);
-  const [streamMode, setStreamMode] = useState<"poll" | "sse">("sse");
+  const [turnStreaming, setTurnStreaming] = useState(false);
+  const [streamMode, setStreamMode] = useState<"poll" | "sse" | "turn">("sse");
   const [eventError, setEventError] = useState<string | null>(null);
 
   const [questionSelections, setQuestionSelections] = useState<Record<string, string[][]>>({});
@@ -95,6 +103,7 @@ export default function App() {
 
   const clientRef = useRef<SandboxAgent | null>(null);
   const sseAbortRef = useRef<AbortController | null>(null);
+  const turnAbortRef = useRef<AbortController | null>(null);
 
   const logRequest = useCallback((entry: RequestLog) => {
     setRequestLog((prev) => {
@@ -200,9 +209,18 @@ export default function App() {
     setEventError(null);
     stopPolling();
     stopSse();
+    stopTurnStream();
+    setAgents([]);
+    setSessions([]);
+    setAgentsLoading(false);
+    setSessionsLoading(false);
+    setAgentsError(null);
+    setSessionsError(null);
   };
 
   const refreshAgents = async () => {
+    setAgentsLoading(true);
+    setAgentsError(null);
     try {
       const data = await getClient().listAgents();
       const agentList = data.agents ?? [];
@@ -213,17 +231,23 @@ export default function App() {
         }
       }
     } catch (error) {
-      setConnectError(getErrorMessage(error, "Unable to refresh agents"));
+      setAgentsError(getErrorMessage(error, "Unable to refresh agents"));
+    } finally {
+      setAgentsLoading(false);
     }
   };
 
   const fetchSessions = async () => {
+    setSessionsLoading(true);
+    setSessionsError(null);
     try {
       const data = await getClient().listSessions();
       const sessionList = data.sessions ?? [];
       setSessions(sessionList);
     } catch {
-      // Silently fail - sessions list is supplementary
+      setSessionsError("Unable to load sessions.");
+    } finally {
+      setSessionsLoading(false);
     }
   };
 
@@ -237,22 +261,32 @@ export default function App() {
   };
 
   const loadModes = async (targetId: string) => {
+    setModesLoadingByAgent((prev) => ({ ...prev, [targetId]: true }));
+    setModesErrorByAgent((prev) => ({ ...prev, [targetId]: null }));
     try {
       const data = await getClient().getAgentModes(targetId);
       const modes = data.modes ?? [];
       setModesByAgent((prev) => ({ ...prev, [targetId]: modes }));
     } catch {
-      // Silently fail - modes are optional
+      setModesErrorByAgent((prev) => ({ ...prev, [targetId]: "Unable to load modes." }));
+    } finally {
+      setModesLoadingByAgent((prev) => ({ ...prev, [targetId]: false }));
     }
   };
 
   const sendMessage = async () => {
-    if (!message.trim()) return;
+    const prompt = message.trim();
+    if (!prompt || !sessionId || turnStreaming) return;
     setSessionError(null);
-    try {
-      await getClient().postMessage(sessionId, { message });
-      setMessage("");
+    setMessage("");
 
+    if (streamMode === "turn") {
+      await startTurnStream(prompt);
+      return;
+    }
+
+    try {
+      await getClient().postMessage(sessionId, { message: prompt });
       if (!polling) {
         if (streamMode === "poll") {
           startPolling();
@@ -266,6 +300,7 @@ export default function App() {
   };
 
   const selectSession = (session: SessionInfo) => {
+    stopTurnStream();
     setSessionId(session.sessionId);
     setAgentId(session.agent);
     setAgentMode(session.agentMode);
@@ -278,7 +313,12 @@ export default function App() {
     setSessionError(null);
   };
 
-  const createNewSession = async () => {
+  const createNewSession = async (nextAgentId?: string) => {
+    stopTurnStream();
+    const selectedAgent = nextAgentId ?? agentId;
+    if (nextAgentId) {
+      setAgentId(nextAgentId);
+    }
     const chars = "abcdefghijklmnopqrstuvwxyz0123456789";
     let id = "session-";
     for (let i = 0; i < 8; i++) {
@@ -297,7 +337,7 @@ export default function App() {
         permissionMode?: string;
         model?: string;
         variant?: string;
-      } = { agent: agentId };
+      } = { agent: selectedAgent };
       if (agentMode) body.agentMode = agentMode;
       if (permissionMode) body.permissionMode = permissionMode;
       if (model) body.model = model;
@@ -320,6 +360,7 @@ export default function App() {
 
   const fetchEvents = useCallback(async () => {
     if (!sessionId) return;
+    setEventsLoading(true);
     try {
       const response = await getClient().getEvents(sessionId, {
         offset: offsetRef.current,
@@ -330,6 +371,8 @@ export default function App() {
       setEventError(null);
     } catch (error) {
       setEventError(getErrorMessage(error, "Unable to fetch events"));
+    } finally {
+      setEventsLoading(false);
     }
   }, [appendEvents, getClient, sessionId]);
 
@@ -394,6 +437,48 @@ export default function App() {
     setPolling(false);
   };
 
+  const startTurnStream = async (prompt: string) => {
+    stopPolling();
+    stopSse();
+    if (turnAbortRef.current) return;
+    if (!sessionId) {
+      setEventError("Select or create a session first.");
+      return;
+    }
+    setEventError(null);
+    setTurnStreaming(true);
+    const controller = new AbortController();
+    turnAbortRef.current = controller;
+    try {
+      for await (const event of getClient().streamTurn(
+        sessionId,
+        { message: prompt },
+        undefined,
+        controller.signal
+      )) {
+        appendEvents([event]);
+      }
+    } catch (error) {
+      if (controller.signal.aborted) {
+        return;
+      }
+      setEventError(getErrorMessage(error, "Turn stream error."));
+    } finally {
+      if (turnAbortRef.current === controller) {
+        turnAbortRef.current = null;
+        setTurnStreaming(false);
+      }
+    }
+  };
+
+  const stopTurnStream = () => {
+    if (turnAbortRef.current) {
+      turnAbortRef.current.abort();
+      turnAbortRef.current = null;
+    }
+    setTurnStreaming(false);
+  };
+
   const resetEvents = () => {
     setEvents([]);
     setOffset(0);
@@ -580,6 +665,7 @@ export default function App() {
     return () => {
       stopPolling();
       stopSse();
+      stopTurnStream();
     };
   }, []);
 
@@ -604,6 +690,7 @@ export default function App() {
 
   useEffect(() => {
     if (!connected || !sessionId || polling) return;
+    if (streamMode === "turn") return;
     const hasSession = sessions.some((session) => session.sessionId === sessionId);
     if (!hasSession) return;
     if (streamMode === "poll") {
@@ -613,6 +700,15 @@ export default function App() {
     }
   }, [connected, sessionId, polling, streamMode, sessions]);
 
+  useEffect(() => {
+    if (streamMode === "turn") {
+      stopPolling();
+      stopSse();
+    } else if (turnStreaming) {
+      stopTurnStream();
+    }
+  }, [streamMode, turnStreaming]);
+
   useEffect(() => {
     messagesEndRef.current?.scrollIntoView({ behavior: "smooth" });
   }, [transcriptEntries]);
@@ -633,6 +729,16 @@ export default function App() {
   const availableAgents = agents.length ? agents.map((agent) => agent.id) : defaultAgents;
   const currentAgent = agents.find((agent) => agent.id === agentId);
   const activeModes = modesByAgent[agentId] ?? [];
+  const modesLoading = modesLoadingByAgent[agentId] ?? false;
+  const modesError = modesErrorByAgent[agentId] ?? null;
+  const agentDisplayNames: Record<string, string> = {
+    claude: "Claude Code",
+    codex: "Codex",
+    opencode: "OpenCode",
+    amp: "Amp",
+    mock: "Mock"
+  };
+  const agentLabel = agentDisplayNames[agentId] ?? agentId;
 
   const handleKeyDown = (event: React.KeyboardEvent<HTMLTextAreaElement>) => {
     if (event.key === "Enter" && !event.shiftKey) {
@@ -642,6 +748,9 @@ export default function App() {
   };
 
   const toggleStream = () => {
+    if (streamMode === "turn") {
+      return;
+    }
     if (polling) {
       if (streamMode === "poll") {
         stopPolling();
@@ -695,11 +804,17 @@ export default function App() {
           onSelectSession={selectSession}
           onRefresh={fetchSessions}
           onCreateSession={createNewSession}
+          availableAgents={availableAgents}
+          agentsLoading={agentsLoading}
+          agentsError={agentsError}
+          sessionsLoading={sessionsLoading}
+          sessionsError={sessionsError}
         />
 
         <ChatPanel
           sessionId={sessionId}
           polling={polling}
+          turnStreaming={turnStreaming}
           transcriptEntries={transcriptEntries}
           sessionError={sessionError}
           message={message}
@@ -708,22 +823,24 @@ export default function App() {
           onKeyDown={handleKeyDown}
           onCreateSession={createNewSession}
           messagesEndRef={messagesEndRef}
-          agentId={agentId}
+          agentLabel={agentLabel}
           agentMode={agentMode}
           permissionMode={permissionMode}
           model={model}
           variant={variant}
           streamMode={streamMode}
-          availableAgents={availableAgents}
           activeModes={activeModes}
           currentAgentVersion={currentAgent?.version ?? null}
-          onAgentChange={setAgentId}
+          modesLoading={modesLoading}
+          modesError={modesError}
           onAgentModeChange={setAgentMode}
           onPermissionModeChange={setPermissionMode}
           onModelChange={setModel}
           onVariantChange={setVariant}
           onStreamModeChange={setStreamMode}
           onToggleStream={toggleStream}
+          hasSession={Boolean(sessionId)}
+          eventError={eventError}
           questionRequests={questionRequests}
           permissionRequests={permissionRequests}
           questionSelections={questionSelections}
@@ -740,6 +857,8 @@ export default function App() {
           offset={offset}
           onFetchEvents={fetchEvents}
           onResetEvents={resetEvents}
+          eventsLoading={eventsLoading}
+          eventsError={eventError}
           requestLog={requestLog}
           copiedLogId={copiedLogId}
           onClearRequestLog={() => setRequestLog([])}
@@ -749,6 +868,8 @@ export default function App() {
           modesByAgent={modesByAgent}
           onRefreshAgents={refreshAgents}
           onInstallAgent={installAgent}
+          agentsLoading={agentsLoading}
+          agentsError={agentsError}
         />
       </main>
     </div>

frontend/packages/inspector/src/components/SessionSidebar.tsx

@@ -1,4 +1,5 @@
 import { Plus, RefreshCw } from "lucide-react";
+import { useEffect, useRef, useState } from "react";
 import type { SessionInfo } from "sandbox-agent";
 
 const SessionSidebar = ({
@@ -6,14 +7,47 @@ const SessionSidebar = ({
   selectedSessionId,
   onSelectSession,
   onRefresh,
-  onCreateSession
+  onCreateSession,
+  availableAgents,
+  agentsLoading,
+  agentsError,
+  sessionsLoading,
+  sessionsError
 }: {
   sessions: SessionInfo[];
   selectedSessionId: string;
   onSelectSession: (session: SessionInfo) => void;
   onRefresh: () => void;
-  onCreateSession: () => void;
+  onCreateSession: (agentId: string) => void;
+  availableAgents: string[];
+  agentsLoading: boolean;
+  agentsError: string | null;
+  sessionsLoading: boolean;
+  sessionsError: string | null;
 }) => {
+  const [showMenu, setShowMenu] = useState(false);
+  const menuRef = useRef<HTMLDivElement | null>(null);
+
+  useEffect(() => {
+    if (!showMenu) return;
+    const handler = (event: MouseEvent) => {
+      if (!menuRef.current) return;
+      if (!menuRef.current.contains(event.target as Node)) {
+        setShowMenu(false);
+      }
+    };
+    document.addEventListener("mousedown", handler);
+    return () => document.removeEventListener("mousedown", handler);
+  }, [showMenu]);
+
+  const agentLabels: Record<string, string> = {
+    claude: "Claude Code",
+    codex: "Codex",
+    opencode: "OpenCode",
+    amp: "Amp",
+    mock: "Mock"
+  };
+
   return (
     <div className="session-sidebar">
       <div className="sidebar-header">
@@ -22,14 +56,46 @@ const SessionSidebar = ({
           <button className="sidebar-icon-btn" onClick={onRefresh} title="Refresh sessions">
             <RefreshCw size={14} />
           </button>
-          <button className="sidebar-add-btn" onClick={onCreateSession} title="New session">
-            <Plus size={14} />
-          </button>
+          <div className="sidebar-add-menu-wrapper" ref={menuRef}>
+            <button
+              className="sidebar-add-btn"
+              onClick={() => setShowMenu((value) => !value)}
+              title="New session"
+            >
+              <Plus size={14} />
+            </button>
+            {showMenu && (
+              <div className="sidebar-add-menu">
+                {agentsLoading && <div className="sidebar-add-status">Loading agents...</div>}
+                {agentsError && <div className="sidebar-add-status error">{agentsError}</div>}
+                {!agentsLoading && !agentsError && availableAgents.length === 0 && (
+                  <div className="sidebar-add-status">No agents available.</div>
+                )}
+                {!agentsLoading && !agentsError &&
+                  availableAgents.map((id) => (
+                    <button
+                      key={id}
+                      className="sidebar-add-option"
+                      onClick={() => {
+                        onCreateSession(id);
+                        setShowMenu(false);
+                      }}
+                    >
+                      {agentLabels[id] ?? id}
+                    </button>
+                  ))}
+              </div>
+            )}
+          </div>
         </div>
       </div>
 
       <div className="session-list">
-        {sessions.length === 0 ? (
+        {sessionsLoading ? (
+          <div className="sidebar-empty">Loading sessions...</div>
+        ) : sessionsError ? (
+          <div className="sidebar-empty error">{sessionsError}</div>
+        ) : sessions.length === 0 ? (
           <div className="sidebar-empty">No sessions yet.</div>
         ) : (
           sessions.map((session) => (

frontend/packages/inspector/src/components/chat/ChatMessages.tsx

@@ -5,10 +5,12 @@ import type { TimelineEntry } from "./types";
 const ChatMessages = ({
   entries,
   sessionError,
+  eventError,
   messagesEndRef
 }: {
   entries: TimelineEntry[];
   sessionError: string | null;
+  eventError: string | null;
   messagesEndRef: React.RefObject<HTMLDivElement>;
 }) => {
   return (
@@ -67,6 +69,7 @@ const ChatMessages = ({
         );
       })}
       {sessionError && <div className="message-error">{sessionError}</div>}
+      {eventError && <div className="message-error">{eventError}</div>}
       <div ref={messagesEndRef} />
     </div>
   );

frontend/packages/inspector/src/components/chat/ChatPanel.tsx

@@ -1,4 +1,4 @@
-import { MessageSquare, Plus, Terminal } from "lucide-react";
+import { MessageSquare, PauseCircle, PlayCircle, Plus, Terminal } from "lucide-react";
 import type { AgentModeInfo, PermissionEventData, QuestionEventData } from "sandbox-agent";
 import ApprovalsTab from "../debug/ApprovalsTab";
 import ChatInput from "./ChatInput";
@@ -9,6 +9,7 @@ import type { TimelineEntry } from "./types";
 const ChatPanel = ({
   sessionId,
   polling,
+  turnStreaming,
   transcriptEntries,
   sessionError,
   message,
@@ -17,22 +18,24 @@ const ChatPanel = ({
   onKeyDown,
   onCreateSession,
   messagesEndRef,
-  agentId,
+  agentLabel,
   agentMode,
   permissionMode,
   model,
   variant,
   streamMode,
-  availableAgents,
   activeModes,
   currentAgentVersion,
-  onAgentChange,
+  hasSession,
+  modesLoading,
+  modesError,
   onAgentModeChange,
   onPermissionModeChange,
   onModelChange,
   onVariantChange,
   onStreamModeChange,
   onToggleStream,
+  eventError,
   questionRequests,
   permissionRequests,
   questionSelections,
@@ -43,6 +46,7 @@ const ChatPanel = ({
 }: {
   sessionId: string;
   polling: boolean;
+  turnStreaming: boolean;
   transcriptEntries: TimelineEntry[];
   sessionError: string | null;
   message: string;
@@ -51,22 +55,24 @@ const ChatPanel = ({
   onKeyDown: (event: React.KeyboardEvent<HTMLTextAreaElement>) => void;
   onCreateSession: () => void;
   messagesEndRef: React.RefObject<HTMLDivElement>;
-  agentId: string;
+  agentLabel: string;
   agentMode: string;
   permissionMode: string;
   model: string;
   variant: string;
-  streamMode: "poll" | "sse";
-  availableAgents: string[];
+  streamMode: "poll" | "sse" | "turn";
   activeModes: AgentModeInfo[];
   currentAgentVersion?: string | null;
-  onAgentChange: (value: string) => void;
+  hasSession: boolean;
+  modesLoading: boolean;
+  modesError: string | null;
   onAgentModeChange: (value: string) => void;
   onPermissionModeChange: (value: string) => void;
   onModelChange: (value: string) => void;
   onVariantChange: (value: string) => void;
-  onStreamModeChange: (value: "poll" | "sse") => void;
+  onStreamModeChange: (value: "poll" | "sse" | "turn") => void;
   onToggleStream: () => void;
+  eventError: string | null;
   questionRequests: QuestionEventData[];
   permissionRequests: PermissionEventData[];
   questionSelections: Record<string, string[][]>;
@@ -76,16 +82,57 @@ const ChatPanel = ({
   onReplyPermission: (requestId: string, reply: "once" | "always" | "reject") => void;
 }) => {
   const hasApprovals = questionRequests.length > 0 || permissionRequests.length > 0;
+  const isTurnMode = streamMode === "turn";
+  const isStreaming = isTurnMode ? turnStreaming : polling;
+  const turnLabel = turnStreaming ? "Streaming" : "On Send";
 
   return (
     <div className="chat-panel">
       <div className="panel-header">
         <div className="panel-header-left">
           <MessageSquare className="button-icon" />
-          <span className="panel-title">Session</span>
+          <span className="panel-title">{sessionId ? "Session" : "No Session"}</span>
           {sessionId && <span className="session-id-display">{sessionId}</span>}
+          {sessionId && <span className="session-agent-display">{agentLabel}</span>}
+        </div>
+        <div className="panel-header-right">
+          <div className="setup-stream">
+            <select
+              className="setup-select-small"
+              value={streamMode}
+              onChange={(e) => onStreamModeChange(e.target.value as "poll" | "sse" | "turn")}
+              title="Stream Mode"
+              disabled={!sessionId}
+            >
+              <option value="poll">Poll</option>
+              <option value="sse">SSE</option>
+              <option value="turn">Turn</option>
+            </select>
+            <button
+              className={`setup-stream-btn ${isStreaming ? "active" : ""}`}
+              onClick={onToggleStream}
+              title={isTurnMode ? "Turn streaming starts on send" : polling ? "Stop streaming" : "Start streaming"}
+              disabled={!sessionId || isTurnMode}
+            >
+              {isTurnMode ? (
+                <>
+                  <PlayCircle size={14} />
+                  <span>{turnLabel}</span>
+                </>
+              ) : polling ? (
+                <>
+                  <PauseCircle size={14} />
+                  <span>Pause</span>
+                </>
+              ) : (
+                <>
+                  <PlayCircle size={14} />
+                  <span>Resume</span>
+                </>
+              )}
+            </button>
+          </div>
         </div>
-        {polling && <span className="pill accent">Live</span>}
       </div>
 
       <div className="messages-container">
@@ -109,6 +156,7 @@ const ChatPanel = ({
           <ChatMessages
             entries={transcriptEntries}
             sessionError={sessionError}
+            eventError={eventError}
             messagesEndRef={messagesEndRef}
           />
         )}
@@ -135,27 +183,24 @@ const ChatPanel = ({
         onSendMessage={onSendMessage}
         onKeyDown={onKeyDown}
         placeholder={sessionId ? "Send a message..." : "Select or create a session first"}
-        disabled={!sessionId}
+        disabled={!sessionId || turnStreaming}
       />
 
       <ChatSetup
-        agentId={agentId}
+        agentLabel={agentLabel}
         agentMode={agentMode}
         permissionMode={permissionMode}
         model={model}
         variant={variant}
-        streamMode={streamMode}
-        polling={polling}
-        availableAgents={availableAgents}
         activeModes={activeModes}
         currentAgentVersion={currentAgentVersion}
-        onAgentChange={onAgentChange}
+        modesLoading={modesLoading}
+        modesError={modesError}
         onAgentModeChange={onAgentModeChange}
         onPermissionModeChange={onPermissionModeChange}
         onModelChange={onModelChange}
         onVariantChange={onVariantChange}
-        onStreamModeChange={onStreamModeChange}
-        onToggleStream={onToggleStream}
+        hasSession={hasSession}
       />
     </div>
   );

frontend/packages/inspector/src/components/chat/ChatSetup.tsx

@@ -1,60 +1,53 @@
-import { PauseCircle, PlayCircle } from "lucide-react";
 import type { AgentModeInfo } from "sandbox-agent";
 
 const ChatSetup = ({
-  agentId,
+  agentLabel,
   agentMode,
   permissionMode,
   model,
   variant,
-  streamMode,
-  polling,
-  availableAgents,
   activeModes,
   currentAgentVersion,
-  onAgentChange,
+  hasSession,
+  modesLoading,
+  modesError,
   onAgentModeChange,
   onPermissionModeChange,
   onModelChange,
-  onVariantChange,
-  onStreamModeChange,
-  onToggleStream
+  onVariantChange
 }: {
-  agentId: string;
+  agentLabel: string;
   agentMode: string;
   permissionMode: string;
   model: string;
   variant: string;
-  streamMode: "poll" | "sse";
-  polling: boolean;
-  availableAgents: string[];
   activeModes: AgentModeInfo[];
   currentAgentVersion?: string | null;
-  onAgentChange: (value: string) => void;
+  hasSession: boolean;
+  modesLoading: boolean;
+  modesError: string | null;
   onAgentModeChange: (value: string) => void;
   onPermissionModeChange: (value: string) => void;
   onModelChange: (value: string) => void;
   onVariantChange: (value: string) => void;
-  onStreamModeChange: (value: "poll" | "sse") => void;
-  onToggleStream: () => void;
 }) => {
+  const agentVersionLabel = currentAgentVersion
+    ? `${agentLabel} v${currentAgentVersion}`
+    : agentLabel;
   return (
     <div className="setup-row">
-      <select className="setup-select" value={agentId} onChange={(e) => onAgentChange(e.target.value)} title="Agent">
-        {availableAgents.map((id) => (
-          <option key={id} value={id}>
-            {id}
-          </option>
-        ))}
-      </select>
-
       <select
         className="setup-select"
         value={agentMode}
         onChange={(e) => onAgentModeChange(e.target.value)}
         title="Mode"
+        disabled={!hasSession || modesLoading || Boolean(modesError)}
       >
-        {activeModes.length > 0 ? (
+        {modesLoading ? (
+          <option value="">Loading modes...</option>
+        ) : modesError ? (
+          <option value="">{modesError}</option>
+        ) : activeModes.length > 0 ? (
           activeModes.map((mode) => (
             <option key={mode.id} value={mode.id}>
               {mode.name || mode.id}
@@ -70,6 +63,7 @@ const ChatSetup = ({
         value={permissionMode}
         onChange={(e) => onPermissionModeChange(e.target.value)}
         title="Permission Mode"
+        disabled={!hasSession}
       >
         <option value="default">Default</option>
         <option value="plan">Plan</option>
@@ -82,6 +76,7 @@ const ChatSetup = ({
         onChange={(e) => onModelChange(e.target.value)}
         placeholder="Model"
         title="Model"
+        disabled={!hasSession}
       />
 
       <input
@@ -90,40 +85,12 @@ const ChatSetup = ({
         onChange={(e) => onVariantChange(e.target.value)}
         placeholder="Variant"
         title="Variant"
+        disabled={!hasSession}
       />
 
-      <div className="setup-stream">
-        <select
-          className="setup-select-small"
-          value={streamMode}
-          onChange={(e) => onStreamModeChange(e.target.value as "poll" | "sse")}
-          title="Stream Mode"
-        >
-          <option value="poll">Poll</option>
-          <option value="sse">SSE</option>
-        </select>
-        <button
-          className={`setup-stream-btn ${polling ? "active" : ""}`}
-          onClick={onToggleStream}
-          title={polling ? "Stop streaming" : "Start streaming"}
-        >
-          {polling ? (
-            <>
-              <PauseCircle size={14} />
-              <span>Pause</span>
-            </>
-          ) : (
-            <>
-              <PlayCircle size={14} />
-              <span>Resume</span>
-            </>
-          )}
-        </button>
-      </div>
-
-      {currentAgentVersion && (
-        <span className="setup-version" title="Installed version">
-          v{currentAgentVersion}
+      {hasSession && (
+        <span className="setup-version" title="Session agent">
+          {agentVersionLabel}
         </span>
       )}
     </div>

frontend/packages/inspector/src/components/debug/AgentsTab.tsx

@@ -8,23 +8,31 @@ const AgentsTab = ({
   defaultAgents,
   modesByAgent,
   onRefresh,
-  onInstall
+  onInstall,
+  loading,
+  error
 }: {
   agents: AgentInfo[];
   defaultAgents: string[];
   modesByAgent: Record<string, AgentModeInfo[]>;
   onRefresh: () => void;
   onInstall: (agentId: string, reinstall: boolean) => void;
+  loading: boolean;
+  error: string | null;
 }) => {
   return (
     <>
       <div className="inline-row" style={{ marginBottom: 16 }}>
-        <button className="button secondary small" onClick={onRefresh}>
+        <button className="button secondary small" onClick={onRefresh} disabled={loading}>
           <RefreshCw className="button-icon" /> Refresh
         </button>
       </div>
 
-      {agents.length === 0 && <div className="card-meta">No agents reported. Click refresh to check.</div>}
+      {error && <div className="banner error">{error}</div>}
+      {loading && <div className="card-meta">Loading agents...</div>}
+      {!loading && agents.length === 0 && (
+        <div className="card-meta">No agents reported. Click refresh to check.</div>
+      )}
 
       {(agents.length
         ? agents

frontend/packages/inspector/src/components/debug/DebugPanel.tsx

@@ -14,6 +14,8 @@ const DebugPanel = ({
   offset,
   onFetchEvents,
   onResetEvents,
+  eventsLoading,
+  eventsError,
   requestLog,
   copiedLogId,
   onClearRequestLog,
@@ -22,7 +24,9 @@ const DebugPanel = ({
   defaultAgents,
   modesByAgent,
   onRefreshAgents,
-  onInstallAgent
+  onInstallAgent,
+  agentsLoading,
+  agentsError
 }: {
   debugTab: DebugTab;
   onDebugTabChange: (tab: DebugTab) => void;
@@ -30,6 +34,8 @@ const DebugPanel = ({
   offset: number;
   onFetchEvents: () => void;
   onResetEvents: () => void;
+  eventsLoading: boolean;
+  eventsError: string | null;
   requestLog: RequestLog[];
   copiedLogId: number | null;
   onClearRequestLog: () => void;
@@ -39,6 +45,8 @@ const DebugPanel = ({
   modesByAgent: Record<string, AgentModeInfo[]>;
   onRefreshAgents: () => void;
   onInstallAgent: (agentId: string, reinstall: boolean) => void;
+  agentsLoading: boolean;
+  agentsError: string | null;
 }) => {
   return (
     <div className="debug-panel">
@@ -69,7 +77,14 @@ const DebugPanel = ({
         )}
 
         {debugTab === "events" && (
-          <EventsTab events={events} offset={offset} onFetch={onFetchEvents} onClear={onResetEvents} />
+          <EventsTab
+            events={events}
+            offset={offset}
+            onFetch={onFetchEvents}
+            onClear={onResetEvents}
+            loading={eventsLoading}
+            error={eventsError}
+          />
         )}
 
         {debugTab === "agents" && (
@@ -79,6 +94,8 @@ const DebugPanel = ({
             modesByAgent={modesByAgent}
             onRefresh={onRefreshAgents}
             onInstall={onInstallAgent}
+            loading={agentsLoading}
+            error={agentsError}
           />
         )}
       </div>

frontend/packages/inspector/src/components/debug/EventsTab.tsx

@@ -8,12 +8,16 @@ const EventsTab = ({
   events,
   offset,
   onFetch,
-  onClear
+  onClear,
+  loading,
+  error
 }: {
   events: UniversalEvent[];
   offset: number;
   onFetch: () => void;
   onClear: () => void;
+  loading: boolean;
+  error: string | null;
 }) => {
   const [collapsedEvents, setCollapsedEvents] = useState<Record<string, boolean>>({});
 
@@ -28,8 +32,8 @@ const EventsTab = ({
       <div className="inline-row" style={{ marginBottom: 12, justifyContent: "space-between" }}>
         <span className="card-meta">Offset: {offset}</span>
         <div className="inline-row">
-          <button className="button ghost small" onClick={onFetch}>
-            Fetch
+          <button className="button ghost small" onClick={onFetch} disabled={loading}>
+            {loading ? "Loading..." : "Fetch"}
           </button>
           <button className="button ghost small" onClick={onClear}>
             Clear
@@ -37,8 +41,12 @@ const EventsTab = ({
         </div>
       </div>
 
+      {error && <div className="banner error">{error}</div>}
+
       {events.length === 0 ? (
-        <div className="card-meta">No events yet. Start streaming to receive events.</div>
+        <div className="card-meta">
+          {loading ? "Loading events..." : "No events yet. Start streaming to receive events."}
+        </div>
       ) : (
         <div className="event-list">
           {[...events].reverse().map((event) => {

research/agents/codex.md

@@ -254,6 +254,70 @@ Codex output is converted via `convertCodexOutput()`:
 - Use `resumeThread(threadId)` to continue conversation
 - Thread ID is captured from `thread.started` event or thread object
 
+## Shared App-Server Architecture (Daemon Implementation)
+
+The sandbox daemon uses a **single shared Codex app-server process** to handle multiple sessions, similar to OpenCode's server model. This differs from Claude/Amp which spawn a new process per turn.
+
+### Architecture Comparison
+
+| Agent | Model | Process Lifetime | Session ID |
+|-------|-------|------------------|------------|
+| Claude | Subprocess | Per-turn (killed on TurnCompleted) | `--resume` flag |
+| Amp | Subprocess | Per-turn | `--continue` flag |
+| OpenCode | HTTP Server | Daemon lifetime | Session ID via API |
+| **Codex** | **Stdio Server** | **Daemon lifetime** | **Thread ID via JSON-RPC** |
+
+### Daemon Flow
+
+1. **First Codex session created**: Spawns `codex app-server` process, performs `initialize`/`initialized` handshake
+2. **Session creation**: Sends `thread/start` request, captures `thread_id` as `native_session_id`
+3. **Message sent**: Sends `turn/start` request with `thread_id`, streams notifications back to session
+4. **Multi-turn**: Reuses same `thread_id`, process stays alive, no respawn needed
+5. **Daemon shutdown**: Process terminated with daemon
+
+### Why This Approach?
+
+1. **Performance**: No process spawn overhead per message
+2. **Multi-turn support**: Thread persists in server memory, no resume needed
+3. **Consistent with OpenCode**: Similar server-based pattern reduces code complexity
+4. **API alignment**: Matches Codex's intended app-server usage pattern
+
+### Protocol Details
+
+The shared server uses JSON-RPC 2.0 for request/response correlation:
+
+```
+Daemon                           Codex App-Server
+   |                                   |
+   |-- initialize {id: 1} ------------>|
+   |<-- response {id: 1} --------------|
+   |-- initialized (notification) ---->|
+   |                                   |
+   |-- thread/start {id: 2} ---------->|
+   |<-- response {id: 2, thread.id} ---|
+   |<-- thread/started (notification) -|
+   |                                   |
+   |-- turn/start {id: 3, threadId} -->|
+   |<-- turn/started (notification) ---|
+   |<-- item/* (notifications) --------|
+   |<-- turn/completed (notification) -|
+```
+
+### Thread-to-Session Routing
+
+Notifications are routed to the correct session by extracting `threadId` from each notification:
+
+```rust
+fn codex_thread_id_from_server_notification(notification) -> Option<String> {
+    // All thread-scoped notifications include threadId field
+    match notification {
+        TurnStarted(params) => Some(params.thread_id),
+        ItemCompleted(params) => Some(params.thread_id),
+        // ... etc
+    }
+}
+```
+
 ## Notes
 
 - SDK is dynamically imported to reduce bundle size

scripts/release/main.ts

@@ -148,6 +148,19 @@ function isStable(version: string) {
   return parseSemver(version).prerelease.length === 0;
 }
 
+function getNpmTag(version: string, latest: boolean) {
+  if (latest) return null;
+  const prerelease = parseSemver(version).prerelease;
+  if (prerelease.length === 0) {
+    return "next";
+  }
+  const hasRc = prerelease.some((part) => part.toLowerCase().startsWith("rc"));
+  if (hasRc) {
+    return "rc";
+  }
+  throw new Error(`Prerelease versions must use rc tag when not latest: ${version}`);
+}
+
 function getAllGitVersions() {
   try {
     execFileSync("git", ["fetch", "--tags", "--force", "--quiet"], {
@@ -411,18 +424,22 @@ function publishCrates(rootDir: string, version: string) {
   }
 }
 
-function publishNpmSdk(rootDir: string, version: string) {
+function publishNpmSdk(rootDir: string, version: string, latest: boolean) {
   const sdkDir = path.join(rootDir, "sdks", "typescript");
   console.log("==> Publishing TypeScript SDK to npm");
+  const npmTag = getNpmTag(version, latest);
   run("npm", ["version", version, "--no-git-tag-version", "--allow-same-version"], { cwd: sdkDir });
   run("pnpm", ["install"], { cwd: sdkDir });
   run("pnpm", ["run", "build"], { cwd: sdkDir });
-  run("npm", ["publish", "--access", "public"], { cwd: sdkDir });
+  const publishArgs = ["publish", "--access", "public"];
+  if (npmTag) publishArgs.push("--tag", npmTag);
+  run("npm", publishArgs, { cwd: sdkDir });
 }
 
-function publishNpmCli(rootDir: string, version: string) {
+function publishNpmCli(rootDir: string, version: string, latest: boolean) {
   const cliDir = path.join(rootDir, "sdks", "cli");
   const distDir = path.join(rootDir, "dist");
+  const npmTag = getNpmTag(version, latest);
 
   for (const [target, info] of Object.entries(PLATFORM_MAP)) {
     const platformDir = path.join(cliDir, "platforms", info.pkg);
@@ -436,7 +453,9 @@ function publishNpmCli(rootDir: string, version: string) {
 
     console.log(`==> Publishing @sandbox-agent/cli-${info.pkg}`);
     run("npm", ["version", version, "--no-git-tag-version", "--allow-same-version"], { cwd: platformDir });
-    run("npm", ["publish", "--access", "public"], { cwd: platformDir });
+    const publishArgs = ["publish", "--access", "public"];
+    if (npmTag) publishArgs.push("--tag", npmTag);
+    run("npm", publishArgs, { cwd: platformDir });
   }
 
   console.log("==> Publishing @sandbox-agent/cli");
@@ -447,7 +466,9 @@ function publishNpmCli(rootDir: string, version: string) {
     pkg.optionalDependencies[dep] = version;
   }
   fs.writeFileSync(pkgPath, JSON.stringify(pkg, null, 2) + "\n");
-  run("npm", ["publish", "--access", "public"], { cwd: cliDir });
+  const publishArgs = ["publish", "--access", "public"];
+  if (npmTag) publishArgs.push("--tag", npmTag);
+  run("npm", publishArgs, { cwd: cliDir });
 }
 
 function validateGit(rootDir: string) {
@@ -542,10 +563,10 @@ async function main() {
       publishCrates(rootDir, version);
     }
     if (flags.has("--publish-npm-sdk")) {
-      publishNpmSdk(rootDir, version);
+      publishNpmSdk(rootDir, version, latest);
     }
     if (flags.has("--publish-npm-cli")) {
-      publishNpmCli(rootDir, version);
+      publishNpmCli(rootDir, version, latest);
     }
     if (flags.has("--upload-typescript")) {
       uploadTypescriptArtifacts(rootDir, version, latest);
@@ -626,11 +647,11 @@ async function main() {
   }
 
   if (shouldRun("publish-npm-sdk")) {
-    publishNpmSdk(rootDir, version);
+    publishNpmSdk(rootDir, version, latest);
   }
 
   if (shouldRun("publish-npm-cli")) {
-    publishNpmCli(rootDir, version);
+    publishNpmCli(rootDir, version, latest);
   }
 
   if (shouldRun("upload-typescript")) {

sdks/typescript/src/client.ts

@@ -13,6 +13,7 @@ import type {
   ProblemDetails,
   QuestionReplyRequest,
   SessionListResponse,
+  TurnStreamQuery,
   UniversalEvent,
 } from "./types.ts";
 
@@ -142,45 +143,37 @@ export class SandboxAgent {
     });
   }
 
+  async postMessageStream(
+    sessionId: string,
+    request: MessageRequest,
+    query?: TurnStreamQuery,
+    signal?: AbortSignal,
+  ): Promise<Response> {
+    return this.requestRaw("POST", `${API_PREFIX}/sessions/${encodeURIComponent(sessionId)}/messages/stream`, {
+      query,
+      body: request,
+      accept: "text/event-stream",
+      signal,
+    });
+  }
+
   async *streamEvents(
     sessionId: string,
     query?: EventsQuery,
     signal?: AbortSignal,
   ): AsyncGenerator<UniversalEvent, void, void> {
     const response = await this.getEventsSse(sessionId, query, signal);
-    if (!response.body) {
-      throw new Error("SSE stream is not readable in this environment.");
-    }
+    yield* this.parseSseStream(response);
+  }
 
-    const reader = response.body.getReader();
-    const decoder = new TextDecoder();
-    let buffer = "";
-
-    while (true) {
-      const { done, value } = await reader.read();
-      if (done) {
-        break;
-      }
-      // Normalize CRLF to LF for consistent parsing
-      buffer += decoder.decode(value, { stream: true }).replace(/\r\n/g, "\n");
-      let index = buffer.indexOf("\n\n");
-      while (index !== -1) {
-        const chunk = buffer.slice(0, index);
-        buffer = buffer.slice(index + 2);
-        const dataLines = chunk
-          .split("\n")
-          .filter((line) => line.startsWith("data:"));
-        if (dataLines.length > 0) {
-          const payload = dataLines
-            .map((line) => line.slice(5).trim())
-            .join("\n");
-          if (payload) {
-            yield JSON.parse(payload) as UniversalEvent;
-          }
-        }
-        index = buffer.indexOf("\n\n");
-      }
-    }
+  async *streamTurn(
+    sessionId: string,
+    request: MessageRequest,
+    query?: TurnStreamQuery,
+    signal?: AbortSignal,
+  ): AsyncGenerator<UniversalEvent, void, void> {
+    const response = await this.postMessageStream(sessionId, request, query, signal);
+    yield* this.parseSseStream(response);
   }
 
   async replyQuestion(
@@ -297,6 +290,42 @@ export class SandboxAgent {
       return undefined;
     }
   }
+
+  private async *parseSseStream(response: Response): AsyncGenerator<UniversalEvent, void, void> {
+    if (!response.body) {
+      throw new Error("SSE stream is not readable in this environment.");
+    }
+
+    const reader = response.body.getReader();
+    const decoder = new TextDecoder();
+    let buffer = "";
+
+    while (true) {
+      const { done, value } = await reader.read();
+      if (done) {
+        break;
+      }
+      // Normalize CRLF to LF for consistent parsing
+      buffer += decoder.decode(value, { stream: true }).replace(/\r\n/g, "\n");
+      let index = buffer.indexOf("\n\n");
+      while (index !== -1) {
+        const chunk = buffer.slice(0, index);
+        buffer = buffer.slice(index + 2);
+        const dataLines = chunk
+          .split("\n")
+          .filter((line) => line.startsWith("data:"));
+        if (dataLines.length > 0) {
+          const payload = dataLines
+            .map((line) => line.slice(5).trim())
+            .join("\n");
+          if (payload) {
+            yield JSON.parse(payload) as UniversalEvent;
+          }
+        }
+        index = buffer.indexOf("\n\n");
+      }
+    }
+  }
 }
 
 const normalizeSpawnOptions = (

sdks/typescript/src/generated/openapi.ts

@@ -32,6 +32,9 @@ export interface paths {
   "/v1/sessions/{session_id}/messages": {
     post: operations["post_message"];
   };
+  "/v1/sessions/{session_id}/messages/stream": {
+    post: operations["post_message_stream"];
+  };
   "/v1/sessions/{session_id}/permissions/{permission_id}/reply": {
     post: operations["reply_permission"];
   };
@@ -258,6 +261,9 @@ export interface components {
     };
     /** @enum {string} */
     TerminatedBy: "agent" | "daemon";
+    TurnStreamQuery: {
+      includeRaw?: boolean | null;
+    };
     UniversalEvent: {
       data: components["schemas"]["UniversalEventData"];
       event_id: string;
@@ -480,6 +486,34 @@ export interface operations {
       };
     };
   };
+  post_message_stream: {
+    parameters: {
+      query?: {
+        /** @description Include raw provider payloads */
+        include_raw?: boolean | null;
+      };
+      path: {
+        /** @description Session id */
+        session_id: string;
+      };
+    };
+    requestBody: {
+      content: {
+        "application/json": components["schemas"]["MessageRequest"];
+      };
+    };
+    responses: {
+      /** @description SSE event stream */
+      200: {
+        content: never;
+      };
+      404: {
+        content: {
+          "application/json": components["schemas"]["ProblemDetails"];
+        };
+      };
+    };
+  };
   reply_permission: {
     parameters: {
       path: {

sdks/typescript/src/index.ts

@@ -41,6 +41,7 @@ export type {
   SessionListResponse,
   SessionStartedData,
   TerminatedBy,
+  TurnStreamQuery,
   UniversalEvent,
   UniversalEventData,
   UniversalEventType,

sdks/typescript/src/types.ts

@@ -39,6 +39,7 @@ export type SessionInfo = S["SessionInfo"];
 export type SessionListResponse = S["SessionListResponse"];
 export type SessionStartedData = S["SessionStartedData"];
 export type TerminatedBy = S["TerminatedBy"];
+export type TurnStreamQuery = S["TurnStreamQuery"];
 export type UniversalEvent = S["UniversalEvent"];
 export type UniversalEventData = S["UniversalEventData"];
 export type UniversalEventType = S["UniversalEventType"];

sdks/typescript/tests/client.test.ts

@@ -164,6 +164,31 @@ describe("SandboxAgent", () => {
     });
   });
 
+  describe("postMessageStream", () => {
+    it("posts message and requests SSE", async () => {
+      const mockFetch = vi.fn().mockResolvedValue(
+        new Response("", {
+          status: 200,
+          headers: { "Content-Type": "text/event-stream" },
+        })
+      );
+      const client = await SandboxAgent.connect({
+        baseUrl: "http://localhost:8080",
+        fetch: mockFetch,
+      });
+
+      await client.postMessageStream("test-session", { message: "Hello" }, { includeRaw: true });
+
+      expect(mockFetch).toHaveBeenCalledWith(
+        "http://localhost:8080/v1/sessions/test-session/messages/stream?includeRaw=true",
+        expect.objectContaining({
+          method: "POST",
+          body: JSON.stringify({ message: "Hello" }),
+        })
+      );
+    });
+  });
+
   describe("getEvents", () => {
     it("returns events", async () => {
       const events = { events: [], hasMore: false };

server/packages/sandbox-agent/src/main.rs

@@ -122,6 +122,9 @@ enum SessionsCommand {
     #[command(name = "send-message")]
     /// Send a message to an existing session.
     SendMessage(SessionMessageArgs),
+    #[command(name = "send-message-stream")]
+    /// Send a message and stream the response for one turn.
+    SendMessageStream(SessionMessageStreamArgs),
     #[command(name = "terminate")]
     /// Terminate a session.
     Terminate(SessionTerminateArgs),
@@ -195,6 +198,17 @@ struct SessionMessageArgs {
     client: ClientArgs,
 }
 
+#[derive(Args, Debug)]
+struct SessionMessageStreamArgs {
+    session_id: String,
+    #[arg(long, short = 'm')]
+    message: String,
+    #[arg(long)]
+    include_raw: bool,
+    #[command(flatten)]
+    client: ClientArgs,
+}
+
 #[derive(Args, Debug)]
 struct SessionEventsArgs {
     session_id: String,
@@ -443,6 +457,22 @@ fn run_sessions(command: &SessionsCommand, cli: &Cli) -> Result<(), CliError> {
             let response = ctx.post(&path, &body)?;
             print_empty_response(response)
         }
+        SessionsCommand::SendMessageStream(args) => {
+            let ctx = ClientContext::new(cli, &args.client)?;
+            let body = MessageRequest {
+                message: args.message.clone(),
+            };
+            let path = format!("{API_PREFIX}/sessions/{}/messages/stream", args.session_id);
+            let response = ctx.post_with_query(
+                &path,
+                &body,
+                &[(
+                    "include_raw",
+                    if args.include_raw { Some("true".to_string()) } else { None },
+                )],
+            )?;
+            print_text_response(response)
+        }
         SessionsCommand::Terminate(args) => {
             let ctx = ClientContext::new(cli, &args.client)?;
             let path = format!("{API_PREFIX}/sessions/{}/terminate", args.session_id);
@@ -850,6 +880,21 @@ impl ClientContext {
         Ok(self.request(Method::POST, path).json(body).send()?)
     }
 
+    fn post_with_query<T: Serialize>(
+        &self,
+        path: &str,
+        body: &T,
+        query: &[(&str, Option<String>)],
+    ) -> Result<reqwest::blocking::Response, CliError> {
+        let mut request = self.request(Method::POST, path).json(body);
+        for (key, value) in query {
+            if let Some(value) = value {
+                request = request.query(&[(key, value)]);
+            }
+        }
+        Ok(request.send()?)
+    }
+
     fn post_empty(&self, path: &str) -> Result<reqwest::blocking::Response, CliError> {
         Ok(self.request(Method::POST, path).send()?)
     }

server/packages/sandbox-agent/src/telemetry.rs

@@ -8,11 +8,15 @@ use std::time::{Duration, SystemTime, UNIX_EPOCH};
 use reqwest::Client;
 use serde::Serialize;
 use time::OffsetDateTime;
+use tokio::time::Instant;
 
 const TELEMETRY_URL: &str = "https://tc.rivet.dev";
 const TELEMETRY_ENV_DEBUG: &str = "SANDBOX_AGENT_TELEMETRY_DEBUG";
 const TELEMETRY_ID_FILE: &str = "telemetry_id";
-const TELEMETRY_TIMEOUT_MS: u64 = 800;
+const TELEMETRY_LAST_SENT_FILE: &str = "telemetry_last_sent";
+const TELEMETRY_TIMEOUT_MS: u64 = 2_000;
+const TELEMETRY_INTERVAL_SECS: u64 = 300;
+const TELEMETRY_MIN_GAP_SECS: i64 = 300;
 
 #[derive(Debug, Serialize)]
 struct TelemetryEvent {
@@ -49,7 +53,6 @@ struct OsInfo {
 #[derive(Debug, Serialize)]
 struct ProviderInfo {
     name: String,
-    confidence: String,
     #[serde(skip_serializing_if = "Option::is_none")]
     method: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -69,11 +72,10 @@ pub fn telemetry_enabled(no_telemetry: bool) -> bool {
 }
 
 pub fn log_enabled_message() {
-    tracing::info!("anonymous telemetry is enabled; disable with --no-telemetry");
+    tracing::info!("anonymous telemetry is enabled, disable with --no-telemetry");
 }
 
 pub fn spawn_telemetry_task() {
-    let event = build_event();
     tokio::spawn(async move {
         let client = match Client::builder()
             .timeout(Duration::from_millis(TELEMETRY_TIMEOUT_MS))
@@ -86,21 +88,38 @@ pub fn spawn_telemetry_task() {
             }
         };
 
-        if let Err(err) = client.post(TELEMETRY_URL).json(&event).send().await {
-            tracing::debug!(error = %err, "telemetry request failed");
+        attempt_send(&client).await;
+        let start = Instant::now() + Duration::from_secs(TELEMETRY_INTERVAL_SECS);
+        let mut interval = tokio::time::interval_at(start, Duration::from_secs(TELEMETRY_INTERVAL_SECS));
+        loop {
+            interval.tick().await;
+            attempt_send(&client).await;
         }
     });
 }
 
-fn build_event() -> TelemetryEvent {
+async fn attempt_send(client: &Client) {
     let dt = OffsetDateTime::now_utc().unix_timestamp();
+    if !should_send(dt) {
+        return;
+    }
+
+    let event = build_event(dt);
+    if let Err(err) = client.post(TELEMETRY_URL).json(&event).send().await {
+        tracing::debug!(error = %err, "telemetry request failed");
+        return;
+    }
+    write_last_sent(dt);
+}
+
+fn build_event(dt: i64) -> TelemetryEvent {
     let eid = load_or_create_id();
     TelemetryEvent {
         p: "sandbox-agent".to_string(),
         dt,
         et: "sandbox".to_string(),
         eid,
-        ev: "entity_snapshot".to_string(),
+        ev: "entity_beacon".to_string(),
         d: TelemetryData {
             version: env!("CARGO_PKG_VERSION").to_string(),
             os: OsInfo {
@@ -138,9 +157,46 @@ fn load_or_create_id() -> String {
 }
 
 fn telemetry_id_path() -> PathBuf {
+    telemetry_dir().join(TELEMETRY_ID_FILE)
+}
+
+fn telemetry_last_sent_path() -> PathBuf {
+    telemetry_dir().join(TELEMETRY_LAST_SENT_FILE)
+}
+
+fn telemetry_dir() -> PathBuf {
     dirs::data_dir()
-        .map(|dir| dir.join("sandbox-agent").join(TELEMETRY_ID_FILE))
-        .unwrap_or_else(|| PathBuf::from(".sandbox-agent").join(TELEMETRY_ID_FILE))
+        .map(|dir| dir.join("sandbox-agent"))
+        .unwrap_or_else(|| PathBuf::from(".sandbox-agent"))
+}
+
+fn should_send(now: i64) -> bool {
+    if let Some(last) = read_last_sent() {
+        if now >= last && now - last < TELEMETRY_MIN_GAP_SECS {
+            return false;
+        }
+    }
+    true
+}
+
+fn read_last_sent() -> Option<i64> {
+    let path = telemetry_last_sent_path();
+    fs::read_to_string(&path)
+        .ok()
+        .and_then(|value| value.trim().parse::<i64>().ok())
+}
+
+fn write_last_sent(timestamp: i64) {
+    let path = telemetry_last_sent_path();
+    if let Some(parent) = path.parent() {
+        if let Err(err) = fs::create_dir_all(parent) {
+            tracing::debug!(error = %err, "failed to create telemetry directory");
+            return;
+        }
+    }
+    if let Ok(mut file) = fs::OpenOptions::new().create(true).write(true).truncate(true).open(&path) {
+        let _ = file.write_all(timestamp.to_string().as_bytes());
+    }
 }
 
 fn generate_id() -> String {
@@ -185,7 +241,6 @@ fn detect_provider() -> ProviderInfo {
         ]);
         return ProviderInfo {
             name: "e2b".to_string(),
-            confidence: "high".to_string(),
             method: Some("env".to_string()),
             metadata,
         };
@@ -206,7 +261,6 @@ fn detect_provider() -> ProviderInfo {
         ]);
         return ProviderInfo {
             name: "vercel".to_string(),
-            confidence: "high".to_string(),
             method: Some("env".to_string()),
             metadata,
         };
@@ -219,7 +273,6 @@ fn detect_provider() -> ProviderInfo {
         ]);
         return ProviderInfo {
             name: "modal".to_string(),
-            confidence: "high".to_string(),
             method: Some("env".to_string()),
             metadata,
         };
@@ -232,7 +285,6 @@ fn detect_provider() -> ProviderInfo {
         ]);
         return ProviderInfo {
             name: "fly.io".to_string(),
-            confidence: "high".to_string(),
             method: Some("env".to_string()),
             metadata,
         };
@@ -245,7 +297,6 @@ fn detect_provider() -> ProviderInfo {
         ]);
         return ProviderInfo {
             name: "replit".to_string(),
-            confidence: "high".to_string(),
             method: Some("env".to_string()),
             metadata,
         };
@@ -254,7 +305,6 @@ fn detect_provider() -> ProviderInfo {
     if env::var("CODESANDBOX_HOST").is_ok() || env::var("CSB_BASE_PREVIEW_HOST").is_ok() {
         return ProviderInfo {
             name: "codesandbox".to_string(),
-            confidence: "high".to_string(),
             method: Some("env".to_string()),
             metadata: None,
         };
@@ -264,7 +314,6 @@ fn detect_provider() -> ProviderInfo {
         let metadata = metadata_or_none([("name", env::var("CODESPACE_NAME").ok())]);
         return ProviderInfo {
             name: "github-codespaces".to_string(),
-            confidence: "high".to_string(),
             method: Some("env".to_string()),
             metadata,
         };
@@ -274,7 +323,6 @@ fn detect_provider() -> ProviderInfo {
         let metadata = metadata_or_none([("environment", env::var("RAILWAY_ENVIRONMENT").ok())]);
         return ProviderInfo {
             name: "railway".to_string(),
-            confidence: "high".to_string(),
             method: Some("env".to_string()),
             metadata,
         };
@@ -284,7 +332,6 @@ fn detect_provider() -> ProviderInfo {
         let metadata = metadata_or_none([("serviceId", env::var("RENDER_SERVICE_ID").ok())]);
         return ProviderInfo {
             name: "render".to_string(),
-            confidence: "high".to_string(),
             method: Some("env".to_string()),
             metadata,
         };
@@ -293,7 +340,6 @@ fn detect_provider() -> ProviderInfo {
     if detect_daytona() {
         return ProviderInfo {
             name: "daytona".to_string(),
-            confidence: "medium".to_string(),
             method: Some("filesystem".to_string()),
             metadata: None,
         };
@@ -302,7 +348,6 @@ fn detect_provider() -> ProviderInfo {
     if detect_docker() {
         return ProviderInfo {
             name: "docker".to_string(),
-            confidence: "high".to_string(),
             method: Some("filesystem".to_string()),
             metadata: None,
         };
@@ -310,7 +355,6 @@ fn detect_provider() -> ProviderInfo {
 
     ProviderInfo {
         name: "unknown".to_string(),
-        confidence: "low".to_string(),
         method: None,
         metadata: None,
     }

server/packages/sandbox-agent/tests/agent_agnostic.rs

@@ -1,657 +0,0 @@
-use std::collections::HashMap;
-use std::time::{Duration, Instant};
-
-use axum::body::Body;
-use axum::http::{Method, Request, StatusCode};
-use axum::Router;
-use http_body_util::BodyExt;
-use serde_json::{json, Value};
-use tempfile::TempDir;
-use tower::util::ServiceExt;
-
-use sandbox_agent_agent_management::agents::{AgentId, AgentManager};
-use sandbox_agent_agent_management::testing::test_agents_from_env;
-use sandbox_agent_agent_credentials::ExtractedCredentials;
-use sandbox_agent::router::{
-    build_router,
-    AgentCapabilities,
-    AgentListResponse,
-    AuthConfig,
-};
-
-const PROMPT: &str = "Reply with exactly the single word OK.";
-const TOOL_PROMPT: &str =
-    "Use the bash tool to run `ls` in the current directory. Do not answer without using the tool.";
-const QUESTION_PROMPT: &str =
-    "Call the AskUserQuestion tool with exactly one yes/no question and wait for a reply. Do not answer yourself.";
-
-/// Agent-agnostic event sequence tests.
-///
-/// These tests assert that the universal schema output is valid and consistent
-/// across agents, and they use capability flags from /v1/agents to skip
-/// unsupported flows.
-
-struct TestApp {
-    app: Router,
-    _install_dir: TempDir,
-}
-
-impl TestApp {
-    fn new() -> Self {
-        let install_dir = tempfile::tempdir().expect("create temp install dir");
-        let manager = AgentManager::new(install_dir.path())
-            .expect("create agent manager");
-        let state = sandbox_agent::router::AppState::new(AuthConfig::disabled(), manager);
-        let app = build_router(state);
-        Self {
-            app,
-            _install_dir: install_dir,
-        }
-    }
-}
-
-struct EnvGuard {
-    saved: HashMap<String, Option<String>>,
-}
-
-impl Drop for EnvGuard {
-    fn drop(&mut self) {
-        for (key, value) in &self.saved {
-            match value {
-                Some(value) => std::env::set_var(key, value),
-                None => std::env::remove_var(key),
-            }
-        }
-    }
-}
-
-fn apply_credentials(creds: &ExtractedCredentials) -> EnvGuard {
-    let keys = ["ANTHROPIC_API_KEY", "CLAUDE_API_KEY", "OPENAI_API_KEY", "CODEX_API_KEY"];
-    let mut saved = HashMap::new();
-    for key in keys {
-        saved.insert(key.to_string(), std::env::var(key).ok());
-    }
-
-    match creds.anthropic.as_ref() {
-        Some(cred) => {
-            std::env::set_var("ANTHROPIC_API_KEY", &cred.api_key);
-            std::env::set_var("CLAUDE_API_KEY", &cred.api_key);
-        }
-        None => {
-            std::env::remove_var("ANTHROPIC_API_KEY");
-            std::env::remove_var("CLAUDE_API_KEY");
-        }
-    }
-
-    match creds.openai.as_ref() {
-        Some(cred) => {
-            std::env::set_var("OPENAI_API_KEY", &cred.api_key);
-            std::env::set_var("CODEX_API_KEY", &cred.api_key);
-        }
-        None => {
-            std::env::remove_var("OPENAI_API_KEY");
-            std::env::remove_var("CODEX_API_KEY");
-        }
-    }
-
-    EnvGuard { saved }
-}
-
-async fn send_json(
-    app: &Router,
-    method: Method,
-    path: &str,
-    body: Option<Value>,
-) -> (StatusCode, Value) {
-    let request = Request::builder()
-        .method(method)
-        .uri(path)
-        .header("content-type", "application/json")
-        .body(Body::from(body.map(|value| value.to_string()).unwrap_or_default()))
-        .expect("request");
-    let response = app
-        .clone()
-        .oneshot(request)
-        .await
-        .expect("response");
-    let status = response.status();
-    let bytes = response
-        .into_body()
-        .collect()
-        .await
-        .expect("body")
-        .to_bytes();
-    let payload = if bytes.is_empty() {
-        Value::Null
-    } else {
-        serde_json::from_slice(&bytes).unwrap_or(Value::Null)
-    };
-    (status, payload)
-}
-
-async fn send_status(app: &Router, method: Method, path: &str, body: Option<Value>) -> StatusCode {
-    let (status, _) = send_json(app, method, path, body).await;
-    status
-}
-
-async fn install_agent(app: &Router, agent: AgentId) {
-    let status = send_status(
-        app,
-        Method::POST,
-        &format!("/v1/agents/{}/install", agent.as_str()),
-        Some(json!({})),
-    )
-    .await;
-    assert_eq!(status, StatusCode::NO_CONTENT, "install agent {}", agent.as_str());
-}
-
-async fn create_session(app: &Router, agent: AgentId, session_id: &str, permission_mode: &str) {
-    let status = send_status(
-        app,
-        Method::POST,
-        &format!("/v1/sessions/{session_id}"),
-        Some(json!({
-            "agent": agent.as_str(),
-            "permissionMode": permission_mode,
-        })),
-    )
-    .await;
-    assert_eq!(status, StatusCode::OK, "create session");
-}
-
-async fn create_session_with_mode(
-    app: &Router,
-    agent: AgentId,
-    session_id: &str,
-    agent_mode: &str,
-    permission_mode: &str,
-) {
-    let status = send_status(
-        app,
-        Method::POST,
-        &format!("/v1/sessions/{session_id}"),
-        Some(json!({
-            "agent": agent.as_str(),
-            "agentMode": agent_mode,
-            "permissionMode": permission_mode,
-        })),
-    )
-    .await;
-    assert_eq!(status, StatusCode::OK, "create session");
-}
-
-fn test_permission_mode(agent: AgentId) -> &'static str {
-    match agent {
-        AgentId::Opencode => "default",
-        _ => "bypass",
-    }
-}
-
-async fn send_message(app: &Router, session_id: &str, message: &str) {
-    let status = send_status(
-        app,
-        Method::POST,
-        &format!("/v1/sessions/{session_id}/messages"),
-        Some(json!({ "message": message })),
-    )
-    .await;
-    assert_eq!(status, StatusCode::NO_CONTENT, "send message");
-}
-
-async fn poll_events_until<F>(
-    app: &Router,
-    session_id: &str,
-    timeout: Duration,
-    mut stop: F,
-) -> Vec<Value>
-where
-    F: FnMut(&[Value]) -> bool,
-{
-    let start = Instant::now();
-    let mut offset = 0u64;
-    let mut events = Vec::new();
-    while start.elapsed() < timeout {
-        let path = format!("/v1/sessions/{session_id}/events?offset={offset}&limit=200");
-        let (status, payload) = send_json(app, Method::GET, &path, None).await;
-        assert_eq!(status, StatusCode::OK, "poll events");
-        let new_events = payload
-            .get("events")
-            .and_then(Value::as_array)
-            .cloned()
-            .unwrap_or_default();
-        if !new_events.is_empty() {
-            if let Some(last) = new_events
-                .last()
-                .and_then(|event| event.get("sequence"))
-                .and_then(Value::as_u64)
-            {
-                offset = last;
-            }
-            events.extend(new_events);
-            if stop(&events) {
-                break;
-            }
-        }
-        tokio::time::sleep(Duration::from_millis(800)).await;
-    }
-    events
-}
-
-async fn fetch_capabilities(app: &Router) -> HashMap<String, AgentCapabilities> {
-    let (status, payload) = send_json(app, Method::GET, "/v1/agents", None).await;
-    assert_eq!(status, StatusCode::OK, "list agents");
-    let response: AgentListResponse = serde_json::from_value(payload).expect("agents payload");
-    response
-        .agents
-        .into_iter()
-        .map(|agent| (agent.id, agent.capabilities))
-        .collect()
-}
-
-fn has_event_type(events: &[Value], event_type: &str) -> bool {
-    events
-        .iter()
-        .any(|event| event.get("type").and_then(Value::as_str) == Some(event_type))
-}
-
-fn find_assistant_message_item(events: &[Value]) -> Option<String> {
-    events.iter().find_map(|event| {
-        if event.get("type").and_then(Value::as_str) != Some("item.completed") {
-            return None;
-        }
-        let item = event.get("data")?.get("item")?;
-        let role = item.get("role")?.as_str()?;
-        let kind = item.get("kind")?.as_str()?;
-        if role != "assistant" || kind != "message" {
-            return None;
-        }
-        item.get("item_id")?.as_str().map(|id| id.to_string())
-    })
-}
-
-fn event_sequence(event: &Value) -> Option<u64> {
-    event.get("sequence").and_then(Value::as_u64)
-}
-
-fn find_item_event_seq(events: &[Value], event_type: &str, item_id: &str) -> Option<u64> {
-    events.iter().find_map(|event| {
-        if event.get("type").and_then(Value::as_str) != Some(event_type) {
-            return None;
-        }
-        match event_type {
-            "item.delta" => {
-                let data = event.get("data")?;
-                let id = data.get("item_id")?.as_str()?;
-                if id == item_id {
-                    event_sequence(event)
-                } else {
-                    None
-                }
-            }
-            _ => {
-                let item = event.get("data")?.get("item")?;
-                let id = item.get("item_id")?.as_str()?;
-                if id == item_id {
-                    event_sequence(event)
-                } else {
-                    None
-                }
-            }
-        }
-    })
-}
-
-fn find_permission_id(events: &[Value]) -> Option<String> {
-    events.iter().find_map(|event| {
-        if event.get("type").and_then(Value::as_str) != Some("permission.requested") {
-            return None;
-        }
-        event
-            .get("data")
-            .and_then(|data| data.get("permission_id"))
-            .and_then(Value::as_str)
-            .map(|id| id.to_string())
-    })
-}
-
-fn find_question_id(events: &[Value]) -> Option<String> {
-    events.iter().find_map(|event| {
-        if event.get("type").and_then(Value::as_str) != Some("question.requested") {
-            return None;
-        }
-        event
-            .get("data")
-            .and_then(|data| data.get("question_id"))
-            .and_then(Value::as_str)
-            .map(|id| id.to_string())
-    })
-}
-
-fn find_first_answer(events: &[Value]) -> Option<Vec<Vec<String>>> {
-    events.iter().find_map(|event| {
-        if event.get("type").and_then(Value::as_str) != Some("question.requested") {
-            return None;
-        }
-        let options = event
-            .get("data")
-            .and_then(|data| data.get("options"))
-            .and_then(Value::as_array)?;
-        let option = options.first()?.as_str()?.to_string();
-        Some(vec![vec![option]])
-    })
-}
-
-fn find_tool_call(events: &[Value]) -> Option<String> {
-    events.iter().find_map(|event| {
-        if event.get("type").and_then(Value::as_str) != Some("item.started")
-            && event.get("type").and_then(Value::as_str) != Some("item.completed")
-        {
-            return None;
-        }
-        let item = event.get("data")?.get("item")?;
-        let kind = item.get("kind")?.as_str()?;
-        if kind != "tool_call" {
-            return None;
-        }
-        item.get("item_id")?.as_str().map(|id| id.to_string())
-    })
-}
-
-fn has_tool_result(events: &[Value]) -> bool {
-    events.iter().any(|event| {
-        if event.get("type").and_then(Value::as_str) != Some("item.completed") {
-            return false;
-        }
-        let item = match event.get("data").and_then(|data| data.get("item")) {
-            Some(item) => item,
-            None => return false,
-        };
-        item.get("kind").and_then(Value::as_str) == Some("tool_result")
-    })
-}
-
-fn expect_basic_sequence(events: &[Value]) {
-    assert!(has_event_type(events, "session.started"), "session.started missing");
-    let item_id = find_assistant_message_item(events).expect("assistant message missing");
-    let started_seq = find_item_event_seq(events, "item.started", &item_id)
-        .expect("item.started missing");
-    // Intentionally require deltas here to validate our synthetic delta behavior.
-    let delta_seq = find_item_event_seq(events, "item.delta", &item_id)
-        .expect("item.delta missing");
-    let completed_seq = find_item_event_seq(events, "item.completed", &item_id)
-        .expect("item.completed missing");
-    assert!(started_seq < delta_seq, "item.started must precede delta");
-    assert!(delta_seq < completed_seq, "delta must precede completion");
-}
-
-#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn agent_agnostic_basic_reply() {
-    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
-    let app = TestApp::new();
-    let capabilities = fetch_capabilities(&app.app).await;
-
-    for config in &configs {
-        let _guard = apply_credentials(&config.credentials);
-        install_agent(&app.app, config.agent).await;
-
-        let session_id = format!("basic-{}", config.agent.as_str());
-        create_session(&app.app, config.agent, &session_id, "default").await;
-        send_message(&app.app, &session_id, PROMPT).await;
-
-        let events = poll_events_until(&app.app, &session_id, Duration::from_secs(120), |events| {
-            has_event_type(events, "error") || find_assistant_message_item(events).is_some()
-        })
-        .await;
-
-        assert!(
-            !events.is_empty(),
-            "no events collected for {}",
-            config.agent.as_str()
-        );
-        expect_basic_sequence(&events);
-
-        let caps = capabilities
-            .get(config.agent.as_str())
-            .expect("capabilities missing");
-        if caps.tool_calls {
-            assert!(
-                !events.iter().any(|event| {
-                    event.get("type").and_then(Value::as_str) == Some("agent.unparsed")
-                }),
-                "agent.unparsed event detected"
-            );
-        }
-    }
-}
-
-#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn agent_agnostic_tool_flow() {
-    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
-    let app = TestApp::new();
-    let capabilities = fetch_capabilities(&app.app).await;
-
-    for config in &configs {
-        let caps = capabilities
-            .get(config.agent.as_str())
-            .expect("capabilities missing");
-        if !caps.tool_calls {
-            continue;
-        }
-
-        let _guard = apply_credentials(&config.credentials);
-        install_agent(&app.app, config.agent).await;
-
-        let session_id = format!("tool-{}", config.agent.as_str());
-        create_session(&app.app, config.agent, &session_id, test_permission_mode(config.agent)).await;
-        send_message(&app.app, &session_id, TOOL_PROMPT).await;
-
-        let start = Instant::now();
-        let mut offset = 0u64;
-        let mut events = Vec::new();
-        let mut replied = false;
-        while start.elapsed() < Duration::from_secs(180) {
-            let path = format!("/v1/sessions/{session_id}/events?offset={offset}&limit=200");
-            let (status, payload) = send_json(&app.app, Method::GET, &path, None).await;
-            assert_eq!(status, StatusCode::OK, "poll events");
-            let new_events = payload
-                .get("events")
-                .and_then(Value::as_array)
-                .cloned()
-                .unwrap_or_default();
-            if !new_events.is_empty() {
-                if let Some(last) = new_events
-                    .last()
-                    .and_then(|event| event.get("sequence"))
-                    .and_then(Value::as_u64)
-                {
-                    offset = last;
-                }
-                events.extend(new_events);
-                if !replied {
-                    if let Some(permission_id) = find_permission_id(&events) {
-                        let _ = send_status(
-                            &app.app,
-                            Method::POST,
-                            &format!(
-                                "/v1/sessions/{session_id}/permissions/{permission_id}/reply"
-                            ),
-                            Some(json!({ "reply": "once" })),
-                        )
-                        .await;
-                        replied = true;
-                    }
-                }
-                if has_tool_result(&events) {
-                    break;
-                }
-            }
-            tokio::time::sleep(Duration::from_millis(800)).await;
-        }
-
-        let tool_call = find_tool_call(&events);
-        let tool_result = has_tool_result(&events);
-        assert!(
-            tool_call.is_some(),
-            "tool_call missing for tool-capable agent {}",
-            config.agent.as_str()
-        );
-        if tool_call.is_some() {
-            assert!(
-                tool_result,
-                "tool_result missing after tool_call for {}",
-                config.agent.as_str()
-            );
-        }
-    }
-}
-
-#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn agent_agnostic_permission_flow() {
-    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
-    let app = TestApp::new();
-    let capabilities = fetch_capabilities(&app.app).await;
-
-    for config in &configs {
-        let caps = capabilities
-            .get(config.agent.as_str())
-            .expect("capabilities missing");
-        if !(caps.plan_mode && caps.permissions) {
-            continue;
-        }
-
-        let _guard = apply_credentials(&config.credentials);
-        install_agent(&app.app, config.agent).await;
-
-        let session_id = format!("perm-{}", config.agent.as_str());
-        create_session(&app.app, config.agent, &session_id, "plan").await;
-        send_message(&app.app, &session_id, TOOL_PROMPT).await;
-
-        let events = poll_events_until(&app.app, &session_id, Duration::from_secs(120), |events| {
-            find_permission_id(events).is_some() || has_event_type(events, "error")
-        })
-        .await;
-
-        let permission_id = find_permission_id(&events).expect("permission.requested missing");
-        let status = send_status(
-            &app.app,
-            Method::POST,
-            &format!("/v1/sessions/{session_id}/permissions/{permission_id}/reply"),
-            Some(json!({ "reply": "once" })),
-        )
-        .await;
-        assert_eq!(status, StatusCode::NO_CONTENT, "permission reply");
-
-        let resolved = poll_events_until(&app.app, &session_id, Duration::from_secs(120), |events| {
-            events.iter().any(|event| {
-                event.get("type").and_then(Value::as_str) == Some("permission.resolved")
-            })
-        })
-        .await;
-
-        assert!(
-            resolved.iter().any(|event| {
-                event.get("type").and_then(Value::as_str) == Some("permission.resolved")
-                    && event
-                        .get("synthetic")
-                        .and_then(Value::as_bool)
-                        .unwrap_or(false)
-            }),
-            "permission.resolved should be synthetic"
-        );
-    }
-}
-
-#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn agent_agnostic_question_flow() {
-    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
-    let app = TestApp::new();
-    let capabilities = fetch_capabilities(&app.app).await;
-
-    for config in &configs {
-        let caps = capabilities
-            .get(config.agent.as_str())
-            .expect("capabilities missing");
-        if !caps.questions {
-            continue;
-        }
-
-        let _guard = apply_credentials(&config.credentials);
-        install_agent(&app.app, config.agent).await;
-
-        let session_id = format!("question-{}", config.agent.as_str());
-        create_session_with_mode(&app.app, config.agent, &session_id, "plan", "plan").await;
-        send_message(&app.app, &session_id, QUESTION_PROMPT).await;
-
-        let events = poll_events_until(&app.app, &session_id, Duration::from_secs(120), |events| {
-            find_question_id(events).is_some() || has_event_type(events, "error")
-        })
-        .await;
-
-        let question_id = find_question_id(&events).expect("question.requested missing");
-        let answers = find_first_answer(&events).unwrap_or_else(|| vec![vec![]]);
-        let status = send_status(
-            &app.app,
-            Method::POST,
-            &format!("/v1/sessions/{session_id}/questions/{question_id}/reply"),
-            Some(json!({ "answers": answers })),
-        )
-        .await;
-        assert_eq!(status, StatusCode::NO_CONTENT, "question reply");
-
-        let resolved = poll_events_until(&app.app, &session_id, Duration::from_secs(120), |events| {
-            events.iter().any(|event| {
-                event.get("type").and_then(Value::as_str) == Some("question.resolved")
-            })
-        })
-        .await;
-
-        assert!(
-            resolved.iter().any(|event| {
-                event.get("type").and_then(Value::as_str) == Some("question.resolved")
-                    && event
-                        .get("synthetic")
-                        .and_then(Value::as_bool)
-                        .unwrap_or(false)
-            }),
-            "question.resolved should be synthetic"
-        );
-    }
-}
-
-#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn agent_agnostic_termination() {
-    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
-    let app = TestApp::new();
-
-    for config in &configs {
-        let _guard = apply_credentials(&config.credentials);
-        install_agent(&app.app, config.agent).await;
-
-        let session_id = format!("terminate-{}", config.agent.as_str());
-        create_session(&app.app, config.agent, &session_id, "default").await;
-
-        let status = send_status(
-            &app.app,
-            Method::POST,
-            &format!("/v1/sessions/{session_id}/terminate"),
-            None,
-        )
-        .await;
-        assert_eq!(status, StatusCode::NO_CONTENT, "terminate session");
-
-        let events = poll_events_until(&app.app, &session_id, Duration::from_secs(30), |events| {
-            has_event_type(events, "session.ended")
-        })
-        .await;
-        assert!(has_event_type(&events, "session.ended"), "missing session.ended");
-
-        let status = send_status(
-            &app.app,
-            Method::POST,
-            &format!("/v1/sessions/{session_id}/messages"),
-            Some(json!({ "message": PROMPT })),
-        )
-        .await;
-        assert!(!status.is_success(), "terminated session should reject messages");
-    }
-}

server/packages/sandbox-agent/tests/agent_basic_reply.rs

@@ -0,0 +1,46 @@
+mod common;
+
+use common::*;
+use sandbox_agent_agent_management::testing::test_agents_from_env;
+use serde_json::Value;
+use std::time::Duration;
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn agent_basic_reply() {
+    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
+    let app = TestApp::new();
+    let capabilities = fetch_capabilities(&app.app).await;
+
+    for config in &configs {
+        let _guard = apply_credentials(&config.credentials);
+        install_agent(&app.app, config.agent).await;
+
+        let session_id = format!("basic-{}", config.agent.as_str());
+        create_session(&app.app, config.agent, &session_id, "default").await;
+        send_message(&app.app, &session_id, PROMPT).await;
+
+        let events = poll_events_until(&app.app, &session_id, Duration::from_secs(120), |events| {
+            has_event_type(events, "error") || find_assistant_message_item(events).is_some()
+        })
+        .await;
+
+        assert!(
+            !events.is_empty(),
+            "no events collected for {}",
+            config.agent.as_str()
+        );
+        expect_basic_sequence(&events);
+
+        let caps = capabilities
+            .get(config.agent.as_str())
+            .expect("capabilities missing");
+        if caps.tool_calls {
+            assert!(
+                !events.iter().any(|event| {
+                    event.get("type").and_then(Value::as_str) == Some("agent.unparsed")
+                }),
+                "agent.unparsed event detected"
+            );
+        }
+    }
+}

server/packages/sandbox-agent/tests/agent_multi_turn.rs

@@ -0,0 +1,457 @@
+//! Tests for multi-turn conversations to validate session resumption behavior.
+//!
+//! This test validates that:
+//! 1. Sessions can handle multiple messages (multi-turn conversations)
+//! 2. Agents that support resumption (Claude, Amp, OpenCode) can continue after process exit
+//! 3. Codex supports multi-turn via the shared app-server model (single process, multiple threads)
+//! 4. The mock agent correctly supports multi-turn as the reference implementation
+
+use std::time::{Duration, Instant};
+
+use axum::body::Body;
+use axum::http::{Method, Request, StatusCode};
+use axum::Router;
+use http_body_util::BodyExt;
+use serde_json::{json, Value};
+use tempfile::TempDir;
+
+use sandbox_agent::router::{build_router, AppState, AuthConfig};
+use sandbox_agent_agent_management::agents::{AgentId, AgentManager};
+use sandbox_agent_agent_management::testing::test_agents_from_env;
+use sandbox_agent_agent_credentials::ExtractedCredentials;
+use std::collections::BTreeMap;
+use tower::util::ServiceExt;
+
+const FIRST_PROMPT: &str = "Reply with exactly the word FIRST.";
+const SECOND_PROMPT: &str = "Reply with exactly the word SECOND.";
+
+struct TestApp {
+    app: Router,
+    _install_dir: TempDir,
+}
+
+impl TestApp {
+    fn new() -> Self {
+        let install_dir = tempfile::tempdir().expect("create temp install dir");
+        let manager = AgentManager::new(install_dir.path()).expect("create agent manager");
+        let state = AppState::new(AuthConfig::disabled(), manager);
+        let app = build_router(state);
+        Self {
+            app,
+            _install_dir: install_dir,
+        }
+    }
+}
+
+struct EnvGuard {
+    saved: BTreeMap<String, Option<String>>,
+}
+
+impl Drop for EnvGuard {
+    fn drop(&mut self) {
+        for (key, value) in &self.saved {
+            match value {
+                Some(value) => std::env::set_var(key, value),
+                None => std::env::remove_var(key),
+            }
+        }
+    }
+}
+
+fn apply_credentials(creds: &ExtractedCredentials) -> EnvGuard {
+    let keys = [
+        "ANTHROPIC_API_KEY",
+        "CLAUDE_API_KEY",
+        "OPENAI_API_KEY",
+        "CODEX_API_KEY",
+    ];
+    let mut saved = BTreeMap::new();
+    for key in keys {
+        saved.insert(key.to_string(), std::env::var(key).ok());
+    }
+
+    match creds.anthropic.as_ref() {
+        Some(cred) => {
+            std::env::set_var("ANTHROPIC_API_KEY", &cred.api_key);
+            std::env::set_var("CLAUDE_API_KEY", &cred.api_key);
+        }
+        None => {
+            std::env::remove_var("ANTHROPIC_API_KEY");
+            std::env::remove_var("CLAUDE_API_KEY");
+        }
+    }
+
+    match creds.openai.as_ref() {
+        Some(cred) => {
+            std::env::set_var("OPENAI_API_KEY", &cred.api_key);
+            std::env::set_var("CODEX_API_KEY", &cred.api_key);
+        }
+        None => {
+            std::env::remove_var("OPENAI_API_KEY");
+            std::env::remove_var("CODEX_API_KEY");
+        }
+    }
+
+    EnvGuard { saved }
+}
+
+async fn send_json(
+    app: &Router,
+    method: Method,
+    path: &str,
+    body: Option<Value>,
+) -> (StatusCode, Value) {
+    let mut builder = Request::builder().method(method).uri(path);
+    let body = if let Some(body) = body {
+        builder = builder.header("content-type", "application/json");
+        Body::from(body.to_string())
+    } else {
+        Body::empty()
+    };
+    let request = builder.body(body).expect("request");
+    let response = app.clone().oneshot(request).await.expect("request handled");
+    let status = response.status();
+    let bytes = response
+        .into_body()
+        .collect()
+        .await
+        .expect("read body")
+        .to_bytes();
+    let value = if bytes.is_empty() {
+        Value::Null
+    } else {
+        serde_json::from_slice(&bytes)
+            .unwrap_or(Value::String(String::from_utf8_lossy(&bytes).to_string()))
+    };
+    (status, value)
+}
+
+async fn send_status(app: &Router, method: Method, path: &str, body: Option<Value>) -> StatusCode {
+    let (status, _) = send_json(app, method, path, body).await;
+    status
+}
+
+async fn install_agent(app: &Router, agent: AgentId) {
+    let status = send_status(
+        app,
+        Method::POST,
+        &format!("/v1/agents/{}/install", agent.as_str()),
+        Some(json!({})),
+    )
+    .await;
+    assert_eq!(status, StatusCode::NO_CONTENT, "install {agent}");
+}
+
+fn test_permission_mode(agent: AgentId) -> &'static str {
+    match agent {
+        AgentId::Opencode => "default",
+        _ => "bypass",
+    }
+}
+
+async fn create_session(app: &Router, agent: AgentId, session_id: &str) {
+    let status = send_status(
+        app,
+        Method::POST,
+        &format!("/v1/sessions/{session_id}"),
+        Some(json!({
+            "agent": agent.as_str(),
+            "permissionMode": test_permission_mode(agent)
+        })),
+    )
+    .await;
+    assert_eq!(status, StatusCode::OK, "create session {agent}");
+}
+
+/// Send a message and return the status code (allows checking for errors)
+async fn send_message_with_status(
+    app: &Router,
+    session_id: &str,
+    message: &str,
+) -> (StatusCode, Value) {
+    send_json(
+        app,
+        Method::POST,
+        &format!("/v1/sessions/{session_id}/messages"),
+        Some(json!({ "message": message })),
+    )
+    .await
+}
+
+/// Wait for a specific number of assistant responses (item.completed with role=assistant)
+async fn wait_for_n_responses(
+    app: &Router,
+    session_id: &str,
+    n: usize,
+    timeout: Duration,
+) -> bool {
+    let start = Instant::now();
+    while start.elapsed() < timeout {
+        let path = format!("/v1/sessions/{session_id}/events?offset=0&limit=1000");
+        let (status, payload) = send_json(app, Method::GET, &path, None).await;
+        if status != StatusCode::OK {
+            return false;
+        }
+        let events = payload
+            .get("events")
+            .and_then(Value::as_array)
+            .cloned()
+            .unwrap_or_default();
+
+        let completed_count = events.iter().filter(|e| is_assistant_completed(e)).count();
+        if completed_count >= n {
+            return true;
+        }
+
+        // Check for errors
+        for event in &events {
+            if is_error_event(event) {
+                eprintln!("Error event: {:?}", event);
+                return false;
+            }
+        }
+
+        tokio::time::sleep(Duration::from_millis(300)).await;
+    }
+    false
+}
+
+/// Wait for an assistant response (item.completed with role=assistant)
+async fn wait_for_response(app: &Router, session_id: &str, timeout: Duration) -> bool {
+    wait_for_n_responses(app, session_id, 1, timeout).await
+}
+
+fn is_assistant_completed(event: &Value) -> bool {
+    event
+        .get("type")
+        .and_then(Value::as_str)
+        .map(|t| t == "item.completed")
+        .unwrap_or(false)
+        && event
+            .get("data")
+            .and_then(|d| d.get("item"))
+            .and_then(|i| i.get("role"))
+            .and_then(Value::as_str)
+            .map(|r| r == "assistant")
+            .unwrap_or(false)
+}
+
+fn is_session_ended(event: &Value) -> bool {
+    event
+        .get("type")
+        .and_then(Value::as_str)
+        .map(|t| t == "session.ended")
+        .unwrap_or(false)
+}
+
+fn is_error_event(event: &Value) -> bool {
+    matches!(
+        event.get("type").and_then(Value::as_str),
+        Some("error") | Some("agent.unparsed")
+    )
+}
+
+/// Count assistant responses in the event stream
+async fn count_assistant_responses(app: &Router, session_id: &str) -> usize {
+    let path = format!("/v1/sessions/{session_id}/events?offset=0&limit=1000");
+    let (status, payload) = send_json(app, Method::GET, &path, None).await;
+    if status != StatusCode::OK {
+        eprintln!("Failed to get events: status={}", status);
+        return 0;
+    }
+    let events = payload
+        .get("events")
+        .and_then(Value::as_array)
+        .cloned()
+        .unwrap_or_default();
+
+    // Debug: print all event types
+    eprintln!("All events ({}):", events.len());
+    for (i, e) in events.iter().enumerate() {
+        let event_type = e.get("type").and_then(Value::as_str).unwrap_or("?");
+        let role = e
+            .get("data")
+            .and_then(|d| d.get("item"))
+            .and_then(|i| i.get("role"))
+            .and_then(Value::as_str)
+            .unwrap_or("-");
+        eprintln!("  [{}] type={}, role={}", i, event_type, role);
+    }
+
+    let count = events.iter().filter(|e| is_assistant_completed(e)).count();
+    eprintln!("Assistant completed count: {}", count);
+    count
+}
+
+/// Test multi-turn conversation for a specific agent
+async fn test_multi_turn_for_agent(app: &Router, agent: AgentId) -> Result<(), String> {
+    let session_id = format!("multi-turn-{}", agent.as_str());
+    eprintln!("\n=== Testing multi-turn for {} ===", agent);
+
+    // Create session
+    create_session(app, agent, &session_id).await;
+    eprintln!("Session created: {}", session_id);
+
+    // Send first message
+    eprintln!("Sending first message...");
+    let (status, body) = send_message_with_status(app, &session_id, FIRST_PROMPT).await;
+    eprintln!("First message status: {}", status);
+    if status != StatusCode::NO_CONTENT {
+        return Err(format!(
+            "First message failed with status {}: {:?}",
+            status, body
+        ));
+    }
+
+    // Wait for first response
+    eprintln!("Waiting for first response...");
+    let got_first = wait_for_response(app, &session_id, Duration::from_secs(120)).await;
+    if !got_first {
+        return Err("Timed out waiting for first response".to_string());
+    }
+    eprintln!("Got first response");
+
+    // Small delay to ensure session state is updated
+    tokio::time::sleep(Duration::from_millis(500)).await;
+
+    // Send second message - this is the critical test
+    eprintln!("Sending second message...");
+    let (status, body) = send_message_with_status(app, &session_id, SECOND_PROMPT).await;
+    eprintln!("Second message status: {}, body: {:?}", status, body);
+    if status != StatusCode::NO_CONTENT {
+        return Err(format!(
+            "Second message failed with status {}: {:?}",
+            status, body
+        ));
+    }
+
+    // Wait for second response - specifically wait for 2 completed responses
+    eprintln!("Waiting for second response (total 2)...");
+    let got_both = wait_for_n_responses(app, &session_id, 2, Duration::from_secs(120)).await;
+    if !got_both {
+        // Debug: show what we got
+        let response_count = count_assistant_responses(app, &session_id).await;
+        return Err(format!(
+            "Timed out waiting for second response (got {} completed)",
+            response_count
+        ));
+    }
+    eprintln!("Got both responses");
+
+    // Verify we got two assistant responses
+    let response_count = count_assistant_responses(app, &session_id).await;
+    eprintln!("Final response count: {}", response_count);
+    if response_count < 2 {
+        return Err(format!(
+            "Expected at least 2 assistant responses, got {}",
+            response_count
+        ));
+    }
+
+    Ok(())
+}
+
+#[tokio::test]
+async fn multi_turn_mock_agent() {
+    let test_app = TestApp::new();
+
+    // Mock agent should always support multi-turn as the reference implementation
+    let result = test_multi_turn_for_agent(&test_app.app, AgentId::Mock).await;
+    assert!(
+        result.is_ok(),
+        "Mock agent multi-turn failed: {:?}",
+        result.err()
+    );
+}
+
+#[tokio::test]
+async fn multi_turn_real_agents() {
+    let configs = match test_agents_from_env() {
+        Ok(configs) => configs,
+        Err(err) => {
+            eprintln!("Failed to get agent configs: {:?}. Skipping multi-turn test.", err);
+            return;
+        }
+    };
+    if configs.is_empty() {
+        eprintln!("No agents configured for testing. Skipping multi-turn test.");
+        return;
+    }
+
+    let test_app = TestApp::new();
+
+    for config in configs {
+        let _guard = apply_credentials(&config.credentials);
+        install_agent(&test_app.app, config.agent).await;
+
+        let result = test_multi_turn_for_agent(&test_app.app, config.agent).await;
+
+        match config.agent {
+            AgentId::Claude | AgentId::Amp | AgentId::Opencode => {
+                // These agents should support multi-turn via resumption
+                assert!(
+                    result.is_ok(),
+                    "{} multi-turn failed (should support resumption): {:?}",
+                    config.agent,
+                    result.err()
+                );
+            }
+            AgentId::Codex => {
+                // Codex now supports multi-turn via the shared app-server model
+                assert!(
+                    result.is_ok(),
+                    "{} multi-turn failed (should support shared app-server): {:?}",
+                    config.agent,
+                    result.err()
+                );
+            }
+            AgentId::Mock => {
+                // Mock is tested separately
+            }
+        }
+    }
+}
+
+/// Test that verifies the session can be reopened after ending
+#[tokio::test]
+async fn session_reopen_after_end() {
+    let test_app = TestApp::new();
+    let session_id = "reopen-test";
+
+    // Create session with mock agent
+    create_session(&test_app.app, AgentId::Mock, session_id).await;
+
+    // Send "end" command to mock agent to end the session
+    let (status, _) = send_message_with_status(&test_app.app, session_id, "end").await;
+    assert_eq!(status, StatusCode::NO_CONTENT);
+
+    // Wait for session to end
+    tokio::time::sleep(Duration::from_millis(500)).await;
+
+    // Verify session is ended
+    let path = format!("/v1/sessions/{session_id}/events?offset=0&limit=100");
+    let (_, payload) = send_json(&test_app.app, Method::GET, &path, None).await;
+    let events = payload
+        .get("events")
+        .and_then(Value::as_array)
+        .cloned()
+        .unwrap_or_default();
+    let has_ended = events.iter().any(|e| is_session_ended(e));
+    assert!(has_ended, "Session should be ended after 'end' command");
+
+    // Try to send another message - mock agent supports resume so this should work
+    // (or fail if we haven't implemented reopen for mock)
+    let (status, body) = send_message_with_status(&test_app.app, session_id, "hello again").await;
+
+    // For mock agent, the session should be reopenable since mock is in agent_supports_resume
+    // But mock's session.ended is triggered differently than real agents
+    // This test documents the current behavior
+    if status == StatusCode::NO_CONTENT {
+        eprintln!("Mock agent session was successfully reopened after end");
+    } else {
+        eprintln!(
+            "Mock agent session could not be reopened (status {}): {:?}",
+            status, body
+        );
+    }
+}

server/packages/sandbox-agent/tests/agent_permission_flow.rs

@@ -0,0 +1,63 @@
+mod common;
+
+use common::*;
+use sandbox_agent_agent_management::testing::test_agents_from_env;
+use std::time::Duration;
+use axum::http::Method;
+use serde_json::json;
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn agent_permission_flow() {
+    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
+    let app = TestApp::new();
+    let capabilities = fetch_capabilities(&app.app).await;
+
+    for config in &configs {
+        let caps = capabilities
+            .get(config.agent.as_str())
+            .expect("capabilities missing");
+        if !(caps.plan_mode && caps.permissions) {
+            continue;
+        }
+
+        let _guard = apply_credentials(&config.credentials);
+        install_agent(&app.app, config.agent).await;
+
+        let session_id = format!("perm-{}", config.agent.as_str());
+        create_session(&app.app, config.agent, &session_id, "plan").await;
+        send_message(&app.app, &session_id, TOOL_PROMPT).await;
+
+        let events = poll_events_until(&app.app, &session_id, Duration::from_secs(120), |events| {
+            find_permission_id(events).is_some() || has_event_type(events, "error")
+        })
+        .await;
+
+        let permission_id = find_permission_id(&events).expect("permission.requested missing");
+        let status = send_status(
+            &app.app,
+            Method::POST,
+            &format!("/v1/sessions/{session_id}/permissions/{permission_id}/reply"),
+            Some(json!({ "reply": "once" })),
+        )
+        .await;
+        assert_eq!(status, axum::http::StatusCode::NO_CONTENT, "permission reply");
+
+        let resolved = poll_events_until(&app.app, &session_id, Duration::from_secs(120), |events| {
+            events.iter().any(|event| {
+                event.get("type").and_then(serde_json::Value::as_str) == Some("permission.resolved")
+            })
+        })
+        .await;
+
+        assert!(
+            resolved.iter().any(|event| {
+                event.get("type").and_then(serde_json::Value::as_str) == Some("permission.resolved")
+                    && event
+                        .get("synthetic")
+                        .and_then(serde_json::Value::as_bool)
+                        .unwrap_or(false)
+            }),
+            "permission.resolved should be synthetic"
+        );
+    }
+}

server/packages/sandbox-agent/tests/agent_question_flow.rs

@@ -0,0 +1,64 @@
+mod common;
+
+use common::*;
+use sandbox_agent_agent_management::testing::test_agents_from_env;
+use std::time::Duration;
+use axum::http::Method;
+use serde_json::json;
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn agent_question_flow() {
+    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
+    let app = TestApp::new();
+    let capabilities = fetch_capabilities(&app.app).await;
+
+    for config in &configs {
+        let caps = capabilities
+            .get(config.agent.as_str())
+            .expect("capabilities missing");
+        if !caps.questions {
+            continue;
+        }
+
+        let _guard = apply_credentials(&config.credentials);
+        install_agent(&app.app, config.agent).await;
+
+        let session_id = format!("question-{}", config.agent.as_str());
+        create_session_with_mode(&app.app, config.agent, &session_id, "plan", "plan").await;
+        send_message(&app.app, &session_id, QUESTION_PROMPT).await;
+
+        let events = poll_events_until(&app.app, &session_id, Duration::from_secs(120), |events| {
+            find_question_id(events).is_some() || has_event_type(events, "error")
+        })
+        .await;
+
+        let question_id = find_question_id(&events).expect("question.requested missing");
+        let answers = find_first_answer(&events).unwrap_or_else(|| vec![vec![]]);
+        let status = send_status(
+            &app.app,
+            Method::POST,
+            &format!("/v1/sessions/{session_id}/questions/{question_id}/reply"),
+            Some(json!({ "answers": answers })),
+        )
+        .await;
+        assert_eq!(status, axum::http::StatusCode::NO_CONTENT, "question reply");
+
+        let resolved = poll_events_until(&app.app, &session_id, Duration::from_secs(120), |events| {
+            events.iter().any(|event| {
+                event.get("type").and_then(serde_json::Value::as_str) == Some("question.resolved")
+            })
+        })
+        .await;
+
+        assert!(
+            resolved.iter().any(|event| {
+                event.get("type").and_then(serde_json::Value::as_str) == Some("question.resolved")
+                    && event
+                        .get("synthetic")
+                        .and_then(serde_json::Value::as_bool)
+                        .unwrap_or(false)
+            }),
+            "question.resolved should be synthetic"
+        );
+    }
+}

server/packages/sandbox-agent/tests/agent_termination.rs

@@ -0,0 +1,45 @@
+mod common;
+
+use common::*;
+use sandbox_agent_agent_management::testing::test_agents_from_env;
+use std::time::Duration;
+use axum::http::Method;
+use serde_json::json;
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn agent_termination() {
+    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
+    let app = TestApp::new();
+
+    for config in &configs {
+        let _guard = apply_credentials(&config.credentials);
+        install_agent(&app.app, config.agent).await;
+
+        let session_id = format!("terminate-{}", config.agent.as_str());
+        create_session(&app.app, config.agent, &session_id, "default").await;
+
+        let status = send_status(
+            &app.app,
+            Method::POST,
+            &format!("/v1/sessions/{session_id}/terminate"),
+            None,
+        )
+        .await;
+        assert_eq!(status, axum::http::StatusCode::NO_CONTENT, "terminate session");
+
+        let events = poll_events_until(&app.app, &session_id, Duration::from_secs(30), |events| {
+            has_event_type(events, "session.ended")
+        })
+        .await;
+        assert!(has_event_type(&events, "session.ended"), "missing session.ended");
+
+        let status = send_status(
+            &app.app,
+            Method::POST,
+            &format!("/v1/sessions/{session_id}/messages"),
+            Some(json!({ "message": PROMPT })),
+        )
+        .await;
+        assert!(!status.is_success(), "terminated session should reject messages");
+    }
+}

server/packages/sandbox-agent/tests/agent_tool_flow.rs

@@ -0,0 +1,94 @@
+mod common;
+
+use common::*;
+use sandbox_agent_agent_management::testing::test_agents_from_env;
+use serde_json::Value;
+use std::time::{Duration, Instant};
+use axum::http::Method;
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn agent_tool_flow() {
+    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
+    let app = TestApp::new();
+    let capabilities = fetch_capabilities(&app.app).await;
+
+    for config in &configs {
+        let caps = capabilities
+            .get(config.agent.as_str())
+            .expect("capabilities missing");
+        if !caps.tool_calls {
+            continue;
+        }
+
+        let _guard = apply_credentials(&config.credentials);
+        install_agent(&app.app, config.agent).await;
+
+        let session_id = format!("tool-{}", config.agent.as_str());
+        create_session(
+            &app.app,
+            config.agent,
+            &session_id,
+            test_permission_mode(config.agent),
+        )
+        .await;
+        send_message(&app.app, &session_id, TOOL_PROMPT).await;
+
+        let start = Instant::now();
+        let mut offset = 0u64;
+        let mut events = Vec::new();
+        let mut replied = false;
+        while start.elapsed() < Duration::from_secs(180) {
+            let path = format!("/v1/sessions/{session_id}/events?offset={offset}&limit=200");
+            let (status, payload) = send_json(&app.app, Method::GET, &path, None).await;
+            assert_eq!(status, axum::http::StatusCode::OK, "poll events");
+            let new_events = payload
+                .get("events")
+                .and_then(Value::as_array)
+                .cloned()
+                .unwrap_or_default();
+            if !new_events.is_empty() {
+                if let Some(last) = new_events
+                    .last()
+                    .and_then(|event| event.get("sequence"))
+                    .and_then(Value::as_u64)
+                {
+                    offset = last;
+                }
+                events.extend(new_events);
+                if !replied {
+                    if let Some(permission_id) = find_permission_id(&events) {
+                        let _ = send_status(
+                            &app.app,
+                            Method::POST,
+                            &format!(
+                                "/v1/sessions/{session_id}/permissions/{permission_id}/reply"
+                            ),
+                            Some(serde_json::json!({ "reply": "once" })),
+                        )
+                        .await;
+                        replied = true;
+                    }
+                }
+                if has_tool_result(&events) {
+                    break;
+                }
+            }
+            tokio::time::sleep(Duration::from_millis(800)).await;
+        }
+
+        let tool_call = find_tool_call(&events);
+        let tool_result = has_tool_result(&events);
+        assert!(
+            tool_call.is_some(),
+            "tool_call missing for tool-capable agent {}",
+            config.agent.as_str()
+        );
+        if tool_call.is_some() {
+            assert!(
+                tool_result,
+                "tool_result missing after tool_call for {}",
+                config.agent.as_str()
+            );
+        }
+    }
+}

server/packages/sandbox-agent/tests/common/mod.rs

@@ -0,0 +1,388 @@
+use std::collections::HashMap;
+use std::time::{Duration, Instant};
+
+use axum::body::Body;
+use axum::http::{Method, Request, StatusCode};
+use axum::Router;
+use http_body_util::BodyExt;
+use serde_json::{json, Value};
+use tempfile::TempDir;
+use tower::util::ServiceExt;
+
+use sandbox_agent::router::{
+    build_router,
+    AgentCapabilities,
+    AgentListResponse,
+    AuthConfig,
+};
+use sandbox_agent_agent_credentials::ExtractedCredentials;
+use sandbox_agent_agent_management::agents::{AgentId, AgentManager};
+
+pub const PROMPT: &str = "Reply with exactly the single word OK.";
+pub const TOOL_PROMPT: &str =
+    "Use the bash tool to run `ls` in the current directory. Do not answer without using the tool.";
+pub const QUESTION_PROMPT: &str =
+    "Call the AskUserQuestion tool with exactly one yes/no question and wait for a reply. Do not answer yourself.";
+
+pub struct TestApp {
+    pub app: Router,
+    _install_dir: TempDir,
+}
+
+impl TestApp {
+    pub fn new() -> Self {
+        let install_dir = tempfile::tempdir().expect("create temp install dir");
+        let manager = AgentManager::new(install_dir.path())
+            .expect("create agent manager");
+        let state = sandbox_agent::router::AppState::new(AuthConfig::disabled(), manager);
+        let app = build_router(state);
+        Self {
+            app,
+            _install_dir: install_dir,
+        }
+    }
+}
+
+pub struct EnvGuard {
+    saved: HashMap<String, Option<String>>,
+}
+
+impl Drop for EnvGuard {
+    fn drop(&mut self) {
+        for (key, value) in &self.saved {
+            match value {
+                Some(value) => std::env::set_var(key, value),
+                None => std::env::remove_var(key),
+            }
+        }
+    }
+}
+
+pub fn apply_credentials(creds: &ExtractedCredentials) -> EnvGuard {
+    let keys = ["ANTHROPIC_API_KEY", "CLAUDE_API_KEY", "OPENAI_API_KEY", "CODEX_API_KEY"];
+    let mut saved = HashMap::new();
+    for key in keys {
+        saved.insert(key.to_string(), std::env::var(key).ok());
+    }
+
+    match creds.anthropic.as_ref() {
+        Some(cred) => {
+            std::env::set_var("ANTHROPIC_API_KEY", &cred.api_key);
+            std::env::set_var("CLAUDE_API_KEY", &cred.api_key);
+        }
+        None => {
+            std::env::remove_var("ANTHROPIC_API_KEY");
+            std::env::remove_var("CLAUDE_API_KEY");
+        }
+    }
+
+    match creds.openai.as_ref() {
+        Some(cred) => {
+            std::env::set_var("OPENAI_API_KEY", &cred.api_key);
+            std::env::set_var("CODEX_API_KEY", &cred.api_key);
+        }
+        None => {
+            std::env::remove_var("OPENAI_API_KEY");
+            std::env::remove_var("CODEX_API_KEY");
+        }
+    }
+
+    EnvGuard { saved }
+}
+
+pub async fn send_json(
+    app: &Router,
+    method: Method,
+    path: &str,
+    body: Option<Value>,
+) -> (StatusCode, Value) {
+    let request = Request::builder()
+        .method(method)
+        .uri(path)
+        .header("content-type", "application/json")
+        .body(Body::from(body.map(|value| value.to_string()).unwrap_or_default()))
+        .expect("request");
+    let response = app
+        .clone()
+        .oneshot(request)
+        .await
+        .expect("response");
+    let status = response.status();
+    let bytes = response
+        .into_body()
+        .collect()
+        .await
+        .expect("body")
+        .to_bytes();
+    let payload = if bytes.is_empty() {
+        Value::Null
+    } else {
+        serde_json::from_slice(&bytes).unwrap_or(Value::Null)
+    };
+    (status, payload)
+}
+
+pub async fn send_status(
+    app: &Router,
+    method: Method,
+    path: &str,
+    body: Option<Value>,
+) -> StatusCode {
+    let (status, _) = send_json(app, method, path, body).await;
+    status
+}
+
+pub async fn install_agent(app: &Router, agent: AgentId) {
+    let status = send_status(
+        app,
+        Method::POST,
+        &format!("/v1/agents/{}/install", agent.as_str()),
+        Some(json!({})),
+    )
+    .await;
+    assert_eq!(status, StatusCode::NO_CONTENT, "install agent {}", agent.as_str());
+}
+
+pub async fn create_session(
+    app: &Router,
+    agent: AgentId,
+    session_id: &str,
+    permission_mode: &str,
+) {
+    let status = send_status(
+        app,
+        Method::POST,
+        &format!("/v1/sessions/{session_id}"),
+        Some(json!({
+            "agent": agent.as_str(),
+            "permissionMode": permission_mode,
+        })),
+    )
+    .await;
+    assert_eq!(status, StatusCode::OK, "create session");
+}
+
+pub async fn create_session_with_mode(
+    app: &Router,
+    agent: AgentId,
+    session_id: &str,
+    agent_mode: &str,
+    permission_mode: &str,
+) {
+    let status = send_status(
+        app,
+        Method::POST,
+        &format!("/v1/sessions/{session_id}"),
+        Some(json!({
+            "agent": agent.as_str(),
+            "agentMode": agent_mode,
+            "permissionMode": permission_mode,
+        })),
+    )
+    .await;
+    assert_eq!(status, StatusCode::OK, "create session");
+}
+
+pub fn test_permission_mode(agent: AgentId) -> &'static str {
+    match agent {
+        AgentId::Opencode => "default",
+        _ => "bypass",
+    }
+}
+
+pub async fn send_message(app: &Router, session_id: &str, message: &str) {
+    let status = send_status(
+        app,
+        Method::POST,
+        &format!("/v1/sessions/{session_id}/messages"),
+        Some(json!({ "message": message })),
+    )
+    .await;
+    assert_eq!(status, StatusCode::NO_CONTENT, "send message");
+}
+
+pub async fn poll_events_until<F>(
+    app: &Router,
+    session_id: &str,
+    timeout: Duration,
+    mut stop: F,
+) -> Vec<Value>
+where
+    F: FnMut(&[Value]) -> bool,
+{
+    let start = Instant::now();
+    let mut offset = 0u64;
+    let mut events = Vec::new();
+    while start.elapsed() < timeout {
+        let path = format!("/v1/sessions/{session_id}/events?offset={offset}&limit=200");
+        let (status, payload) = send_json(app, Method::GET, &path, None).await;
+        assert_eq!(status, StatusCode::OK, "poll events");
+        let new_events = payload
+            .get("events")
+            .and_then(Value::as_array)
+            .cloned()
+            .unwrap_or_default();
+        if !new_events.is_empty() {
+            if let Some(last) = new_events
+                .last()
+                .and_then(|event| event.get("sequence"))
+                .and_then(Value::as_u64)
+            {
+                offset = last;
+            }
+            events.extend(new_events);
+            if stop(&events) {
+                break;
+            }
+        }
+        tokio::time::sleep(Duration::from_millis(800)).await;
+    }
+    events
+}
+
+pub async fn fetch_capabilities(app: &Router) -> HashMap<String, AgentCapabilities> {
+    let (status, payload) = send_json(app, Method::GET, "/v1/agents", None).await;
+    assert_eq!(status, StatusCode::OK, "list agents");
+    let response: AgentListResponse = serde_json::from_value(payload).expect("agents payload");
+    response
+        .agents
+        .into_iter()
+        .map(|agent| (agent.id, agent.capabilities))
+        .collect()
+}
+
+pub fn has_event_type(events: &[Value], event_type: &str) -> bool {
+    events
+        .iter()
+        .any(|event| event.get("type").and_then(Value::as_str) == Some(event_type))
+}
+
+pub fn find_assistant_message_item(events: &[Value]) -> Option<String> {
+    events.iter().find_map(|event| {
+        if event.get("type").and_then(Value::as_str) != Some("item.completed") {
+            return None;
+        }
+        let item = event.get("data")?.get("item")?;
+        let role = item.get("role")?.as_str()?;
+        let kind = item.get("kind")?.as_str()?;
+        if role != "assistant" || kind != "message" {
+            return None;
+        }
+        item.get("item_id")?.as_str().map(|id| id.to_string())
+    })
+}
+
+pub fn event_sequence(event: &Value) -> Option<u64> {
+    event.get("sequence").and_then(Value::as_u64)
+}
+
+pub fn find_item_event_seq(events: &[Value], event_type: &str, item_id: &str) -> Option<u64> {
+    events.iter().find_map(|event| {
+        if event.get("type").and_then(Value::as_str) != Some(event_type) {
+            return None;
+        }
+        match event_type {
+            "item.delta" => {
+                let data = event.get("data")?;
+                let id = data.get("item_id")?.as_str()?;
+                if id == item_id {
+                    event_sequence(event)
+                } else {
+                    None
+                }
+            }
+            _ => {
+                let item = event.get("data")?.get("item")?;
+                let id = item.get("item_id")?.as_str()?;
+                if id == item_id {
+                    event_sequence(event)
+                } else {
+                    None
+                }
+            }
+        }
+    })
+}
+
+pub fn find_permission_id(events: &[Value]) -> Option<String> {
+    events.iter().find_map(|event| {
+        if event.get("type").and_then(Value::as_str) != Some("permission.requested") {
+            return None;
+        }
+        event
+            .get("data")
+            .and_then(|data| data.get("permission_id"))
+            .and_then(Value::as_str)
+            .map(|id| id.to_string())
+    })
+}
+
+pub fn find_question_id(events: &[Value]) -> Option<String> {
+    events.iter().find_map(|event| {
+        if event.get("type").and_then(Value::as_str) != Some("question.requested") {
+            return None;
+        }
+        event
+            .get("data")
+            .and_then(|data| data.get("question_id"))
+            .and_then(Value::as_str)
+            .map(|id| id.to_string())
+    })
+}
+
+pub fn find_first_answer(events: &[Value]) -> Option<Vec<Vec<String>>> {
+    events.iter().find_map(|event| {
+        if event.get("type").and_then(Value::as_str) != Some("question.requested") {
+            return None;
+        }
+        let options = event
+            .get("data")
+            .and_then(|data| data.get("options"))
+            .and_then(Value::as_array)?;
+        let option = options.first()?.as_str()?.to_string();
+        Some(vec![vec![option]])
+    })
+}
+
+pub fn find_tool_call(events: &[Value]) -> Option<String> {
+    events.iter().find_map(|event| {
+        if event.get("type").and_then(Value::as_str) != Some("item.started")
+            && event.get("type").and_then(Value::as_str) != Some("item.completed")
+        {
+            return None;
+        }
+        let item = event.get("data")?.get("item")?;
+        let kind = item.get("kind")?.as_str()?;
+        if kind != "tool_call" {
+            return None;
+        }
+        item.get("item_id")?.as_str().map(|id| id.to_string())
+    })
+}
+
+pub fn has_tool_result(events: &[Value]) -> bool {
+    events.iter().any(|event| {
+        if event.get("type").and_then(Value::as_str) != Some("item.completed") {
+            return false;
+        }
+        let item = match event.get("data").and_then(|data| data.get("item")) {
+            Some(item) => item,
+            None => return false,
+        };
+        item.get("kind").and_then(Value::as_str) == Some("tool_result")
+    })
+}
+
+pub fn expect_basic_sequence(events: &[Value]) {
+    assert!(has_event_type(events, "session.started"), "session.started missing");
+    let item_id = find_assistant_message_item(events).expect("assistant message missing");
+    let started_seq = find_item_event_seq(events, "item.started", &item_id)
+        .expect("item.started missing");
+    // Intentionally require deltas here to validate our synthetic delta behavior.
+    let delta_seq = find_item_event_seq(events, "item.delta", &item_id)
+        .expect("item.delta missing");
+    let completed_seq = find_item_event_seq(events, "item.completed", &item_id)
+        .expect("item.completed missing");
+    assert!(started_seq < delta_seq, "item.started must precede delta");
+    assert!(delta_seq < completed_seq, "delta must precede completion");
+}

server/packages/sandbox-agent/tests/http_sse_snapshots.rs

@@ -291,6 +291,57 @@ async fn read_sse_events(
     events
 }
 
+async fn read_turn_stream_events(
+    app: &Router,
+    session_id: &str,
+    timeout: Duration,
+) -> Vec<Value> {
+    let request = Request::builder()
+        .method(Method::POST)
+        .uri(format!("/v1/sessions/{session_id}/messages/stream"))
+        .header("content-type", "application/json")
+        .body(Body::from(json!({ "message": PROMPT }).to_string()))
+        .expect("turn stream request");
+    let response = app
+        .clone()
+        .oneshot(request)
+        .await
+        .expect("turn stream response");
+    assert_eq!(response.status(), StatusCode::OK, "turn stream status");
+
+    let mut stream = response.into_body().into_data_stream();
+    let mut buffer = String::new();
+    let mut events = Vec::new();
+    let start = Instant::now();
+    let mut ended = false;
+    loop {
+        let remaining = match timeout.checked_sub(start.elapsed()) {
+            Some(remaining) if !remaining.is_zero() => remaining,
+            _ => break,
+        };
+        let next = tokio::time::timeout(remaining, stream.next()).await;
+        let chunk: Bytes = match next {
+            Ok(Some(Ok(chunk))) => chunk,
+            Ok(Some(Err(_))) => break,
+            Ok(None) => {
+                ended = true;
+                break;
+            }
+            Err(_) => break,
+        };
+        buffer.push_str(&String::from_utf8_lossy(&chunk));
+        while let Some(idx) = buffer.find("\n\n") {
+            let block = buffer[..idx].to_string();
+            buffer = buffer[idx + 2..].to_string();
+            if let Some(event) = parse_sse_block(&block) {
+                events.push(event);
+            }
+        }
+    }
+    assert!(ended, "turn stream did not close before timeout");
+    events
+}
+
 fn parse_sse_block(block: &str) -> Option<Value> {
     let mut data_lines = Vec::new();
     for line in block.lines() {
@@ -798,6 +849,27 @@ async fn run_sse_events_snapshot(app: &Router, config: &TestAgentConfig) {
     });
 }
 
+async fn run_turn_stream_check(app: &Router, config: &TestAgentConfig) {
+    let _guard = apply_credentials(&config.credentials);
+    install_agent(app, config.agent).await;
+
+    let session_id = format!("turn-{}", config.agent.as_str());
+    create_session(app, config.agent, &session_id, test_permission_mode(config.agent)).await;
+
+    let events = read_turn_stream_events(app, &session_id, Duration::from_secs(120)).await;
+    let events = truncate_after_first_stop(&events);
+    assert!(
+        !events.is_empty(),
+        "no turn stream events collected for {}",
+        config.agent
+    );
+    assert!(
+        should_stop(&events),
+        "timed out waiting for assistant/error event for {}",
+        config.agent
+    );
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn auth_snapshots() {
     let token = "test-token";
@@ -1294,6 +1366,20 @@ async fn sse_events_snapshots() {
     }
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn turn_stream_route() {
+    let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");
+    let app = TestApp::new();
+    for config in &configs {
+        // OpenCode's embedded bun hangs when installing plugins, blocking SSE event streaming.
+        // See: https://github.com/opencode-ai/opencode/issues/XXX
+        if config.agent == AgentId::Opencode {
+            continue;
+        }
+        run_turn_stream_check(&app.app, config).await;
+    }
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn concurrency_snapshots() {
     let configs = test_agents_from_env().expect("configure SANDBOX_TEST_AGENTS or install agents");

server/packages/sandbox-agent/tests/snapshots/http_sse_snapshots__api_endpoints_snapshots@agents_list_global.snap

@@ -1,10 +1,10 @@
 ---
 source: server/packages/sandbox-agent/tests/http_sse_snapshots.rs
-assertion_line: 881
 expression: normalize_agent_list(&agents)
 ---
 agents:
   - id: amp
   - id: claude
   - id: codex
+  - id: mock
   - id: opencode

server/packages/sandbox-agent/tests/snapshots/http_sse_snapshots__api_endpoints_snapshots@create_session_codex.snap

@@ -1,6 +1,6 @@
 ---
 source: server/packages/sandbox-agent/tests/http_sse_snapshots.rs
-assertion_line: 934
 expression: normalize_create_session(&created)
 ---
 healthy: true
+nativeSessionId: "<redacted>"

server/packages/sandbox-agent/tests/snapshots/http_sse_snapshots__approval_flow_snapshots@permission_events_codex.snap

@@ -1,36 +1,379 @@
 ---
 source: server/packages/sandbox-agent/tests/http_sse_snapshots.rs
-assertion_line: 984
 expression: normalize_events(&permission_events)
 ---
-- agent: codex
-  kind: started
+- metadata: true
   seq: 1
-  started:
-    message: session.created
-- agent: codex
-  kind: started
+  session: started
+  source: daemon
+  synthetic: true
+  type: session.started
+- metadata: true
   seq: 2
-  started:
-    message: thread/started
-- agent: codex
-  kind: started
+  session: started
+  source: agent
+  synthetic: false
+  type: session.started
+- item:
+    content_types:
+      - status
+    kind: status
+    role: system
+    status: completed
   seq: 3
-  started:
-    message: turn/started
-- agent: codex
-  kind: message
-  message:
-    parts:
-      - text: "<redacted>"
-        type: text
+  source: agent
+  synthetic: false
+  type: item.completed
+- item:
+    content_types:
+      - text
+    kind: message
     role: user
+    status: in_progress
   seq: 4
-- agent: codex
-  kind: message
-  message:
-    parts:
-      - text: "<redacted>"
-        type: text
-    role: assistant
+  source: agent
+  synthetic: false
+  type: item.started
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
   seq: 5
+  source: daemon
+  synthetic: true
+  type: item.delta
+- item:
+    content_types:
+      - text
+    kind: message
+    role: user
+    status: completed
+  seq: 6
+  source: agent
+  synthetic: false
+  type: item.completed
+- item:
+    content_types: []
+    kind: message
+    role: assistant
+    status: in_progress
+  seq: 7
+  source: agent
+  synthetic: false
+  type: item.started
+- item:
+    content_types:
+      - status
+    kind: status
+    role: system
+    status: completed
+  seq: 8
+  source: agent
+  synthetic: false
+  type: item.completed
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 9
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 10
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 11
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 12
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 13
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 14
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 15
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 16
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 17
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 18
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 19
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 20
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 21
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 22
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 23
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 24
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 25
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 26
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 27
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 28
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 29
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 30
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 31
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 32
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 33
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 34
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 35
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 36
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 37
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 38
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 39
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 40
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 41
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 42
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 43
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 44
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 45
+  source: agent
+  synthetic: false
+  type: item.delta
+- item:
+    content_types:
+      - reasoning
+    kind: message
+    role: assistant
+    status: completed
+  seq: 46
+  source: agent
+  synthetic: false
+  type: item.completed

server/packages/sandbox-agent/tests/snapshots/http_sse_snapshots__approval_flow_snapshots@question_reject_events_codex.snap

@@ -1,36 +1,275 @@
 ---
 source: server/packages/sandbox-agent/tests/http_sse_snapshots.rs
-assertion_line: 1106
 expression: normalize_events(&reject_events)
 ---
-- agent: codex
-  kind: started
+- metadata: true
   seq: 1
-  started:
-    message: session.created
-- agent: codex
-  kind: started
+  session: started
+  source: daemon
+  synthetic: true
+  type: session.started
+- metadata: true
   seq: 2
-  started:
-    message: thread/started
-- agent: codex
-  kind: started
+  session: started
+  source: agent
+  synthetic: false
+  type: session.started
+- item:
+    content_types:
+      - status
+    kind: status
+    role: system
+    status: completed
   seq: 3
-  started:
-    message: turn/started
-- agent: codex
-  kind: message
-  message:
-    parts:
-      - text: "<redacted>"
-        type: text
+  source: agent
+  synthetic: false
+  type: item.completed
+- item:
+    content_types:
+      - text
+    kind: message
     role: user
+    status: in_progress
   seq: 4
-- agent: codex
-  kind: message
-  message:
-    parts:
-      - text: "<redacted>"
-        type: text
-    role: assistant
+  source: agent
+  synthetic: false
+  type: item.started
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
   seq: 5
+  source: daemon
+  synthetic: true
+  type: item.delta
+- item:
+    content_types:
+      - text
+    kind: message
+    role: user
+    status: completed
+  seq: 6
+  source: agent
+  synthetic: false
+  type: item.completed
+- item:
+    content_types: []
+    kind: message
+    role: assistant
+    status: in_progress
+  seq: 7
+  source: agent
+  synthetic: false
+  type: item.started
+- item:
+    content_types:
+      - status
+    kind: status
+    role: system
+    status: completed
+  seq: 8
+  source: agent
+  synthetic: false
+  type: item.completed
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 9
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 10
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 11
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 12
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 13
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 14
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 15
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 16
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 17
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 18
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 19
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 20
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 21
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 22
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 23
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 24
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 25
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 26
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 27
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 28
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 29
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 30
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 31
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 32
+  source: agent
+  synthetic: false
+  type: item.delta
+- item:
+    content_types:
+      - reasoning
+    kind: message
+    role: assistant
+    status: completed
+  seq: 33
+  source: agent
+  synthetic: false
+  type: item.completed

server/packages/sandbox-agent/tests/snapshots/http_sse_snapshots__approval_flow_snapshots@question_reply_events_codex.snap

@@ -1,36 +1,72 @@
 ---
 source: server/packages/sandbox-agent/tests/http_sse_snapshots.rs
-assertion_line: 1045
 expression: normalize_events(&question_events)
 ---
-- agent: codex
-  kind: started
+- metadata: true
   seq: 1
-  started:
-    message: session.created
-- agent: codex
-  kind: started
+  session: started
+  source: daemon
+  synthetic: true
+  type: session.started
+- metadata: true
   seq: 2
-  started:
-    message: thread/started
-- agent: codex
-  kind: started
+  session: started
+  source: agent
+  synthetic: false
+  type: session.started
+- item:
+    content_types:
+      - status
+    kind: status
+    role: system
+    status: completed
   seq: 3
-  started:
-    message: turn/started
-- agent: codex
-  kind: message
-  message:
-    parts:
-      - text: "<redacted>"
-        type: text
+  source: agent
+  synthetic: false
+  type: item.completed
+- item:
+    content_types:
+      - text
+    kind: message
     role: user
+    status: in_progress
   seq: 4
-- agent: codex
-  kind: message
-  message:
-    parts:
-      - text: "<redacted>"
-        type: text
-    role: assistant
+  source: agent
+  synthetic: false
+  type: item.started
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
   seq: 5
+  source: daemon
+  synthetic: true
+  type: item.delta
+- item:
+    content_types:
+      - text
+    kind: message
+    role: user
+    status: completed
+  seq: 6
+  source: agent
+  synthetic: false
+  type: item.completed
+- item:
+    content_types: []
+    kind: message
+    role: assistant
+    status: in_progress
+  seq: 7
+  source: agent
+  synthetic: false
+  type: item.started
+- item:
+    content_types: []
+    kind: message
+    role: assistant
+    status: completed
+  seq: 8
+  source: agent
+  synthetic: false
+  type: item.completed

server/packages/sandbox-agent/tests/snapshots/http_sse_snapshots__auth_snapshots@auth_valid_token_global.snap

@@ -1,6 +1,5 @@
 ---
 source: server/packages/sandbox-agent/tests/http_sse_snapshots.rs
-assertion_line: 810
 expression: "json!({\n    \"status\": status.as_u16(), \"payload\": normalize_agent_list(&payload),\n})"
 ---
 payload:
@@ -8,5 +7,6 @@ payload:
     - id: amp
     - id: claude
     - id: codex
+    - id: mock
     - id: opencode
 status: 200

server/packages/sandbox-agent/tests/snapshots/http_sse_snapshots__run_concurrency_snapshot@concurrency_events_codex.snap

@@ -1,69 +1,224 @@
 ---
 source: server/packages/sandbox-agent/tests/http_sse_snapshots.rs
-assertion_line: 1214
 expression: snapshot
 ---
 session_a:
-  - agent: codex
-    kind: started
+  - metadata: true
     seq: 1
-    started:
-      message: session.created
-  - agent: codex
-    kind: started
+    session: started
+    source: daemon
+    synthetic: true
+    type: session.started
+  - item:
+      content_types:
+        - status
+      kind: status
+      role: system
+      status: completed
     seq: 2
-    started:
-      message: thread/started
-  - agent: codex
-    kind: started
-    seq: 3
-    started:
-      message: turn/started
-  - agent: codex
-    kind: message
-    message:
-      parts:
-        - text: "<redacted>"
-          type: text
+    source: agent
+    synthetic: false
+    type: item.completed
+  - item:
+      content_types:
+        - text
+      kind: message
       role: user
+      status: in_progress
+    seq: 3
+    source: agent
+    synthetic: false
+    type: item.started
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
     seq: 4
-  - agent: codex
-    kind: message
-    message:
-      parts:
-        - text: "<redacted>"
-          type: text
-      role: assistant
+    source: daemon
+    synthetic: true
+    type: item.delta
+  - item:
+      content_types:
+        - text
+      kind: message
+      role: user
+      status: completed
     seq: 5
+    source: agent
+    synthetic: false
+    type: item.completed
+  - item:
+      content_types: []
+      kind: message
+      role: assistant
+      status: in_progress
+    seq: 6
+    source: agent
+    synthetic: false
+    type: item.started
+  - item:
+      content_types:
+        - status
+      kind: status
+      role: system
+      status: completed
+    seq: 7
+    source: agent
+    synthetic: false
+    type: item.completed
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
+    seq: 8
+    source: agent
+    synthetic: false
+    type: item.delta
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
+    seq: 9
+    source: agent
+    synthetic: false
+    type: item.delta
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
+    seq: 10
+    source: agent
+    synthetic: false
+    type: item.delta
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
+    seq: 11
+    source: agent
+    synthetic: false
+    type: item.delta
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
+    seq: 12
+    source: agent
+    synthetic: false
+    type: item.delta
+  - item:
+      content_types:
+        - reasoning
+      kind: message
+      role: assistant
+      status: completed
+    seq: 13
+    source: agent
+    synthetic: false
+    type: item.completed
 session_b:
-  - agent: codex
-    kind: started
+  - metadata: true
     seq: 1
-    started:
-      message: session.created
-  - agent: codex
-    kind: started
+    session: started
+    source: daemon
+    synthetic: true
+    type: session.started
+  - item:
+      content_types:
+        - status
+      kind: status
+      role: system
+      status: completed
     seq: 2
-    started:
-      message: thread/started
-  - agent: codex
-    kind: started
-    seq: 3
-    started:
-      message: turn/started
-  - agent: codex
-    kind: message
-    message:
-      parts:
-        - text: "<redacted>"
-          type: text
+    source: agent
+    synthetic: false
+    type: item.completed
+  - item:
+      content_types:
+        - text
+      kind: message
       role: user
+      status: in_progress
+    seq: 3
+    source: agent
+    synthetic: false
+    type: item.started
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
     seq: 4
-  - agent: codex
-    kind: message
-    message:
-      parts:
-        - text: "<redacted>"
-          type: text
-      role: assistant
+    source: daemon
+    synthetic: true
+    type: item.delta
+  - item:
+      content_types:
+        - text
+      kind: message
+      role: user
+      status: completed
     seq: 5
+    source: agent
+    synthetic: false
+    type: item.completed
+  - item:
+      content_types: []
+      kind: message
+      role: assistant
+      status: in_progress
+    seq: 6
+    source: agent
+    synthetic: false
+    type: item.started
+  - item:
+      content_types:
+        - status
+      kind: status
+      role: system
+      status: completed
+    seq: 7
+    source: agent
+    synthetic: false
+    type: item.completed
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
+    seq: 8
+    source: agent
+    synthetic: false
+    type: item.delta
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
+    seq: 9
+    source: agent
+    synthetic: false
+    type: item.delta
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
+    seq: 10
+    source: agent
+    synthetic: false
+    type: item.delta
+  - delta:
+      delta: "<redacted>"
+      item_id: "<redacted>"
+      native_item_id: "<redacted>"
+    seq: 11
+    source: agent
+    synthetic: false
+    type: item.delta
+  - item:
+      content_types:
+        - reasoning
+      kind: message
+      role: assistant
+      status: completed
+    seq: 12
+    source: agent
+    synthetic: false
+    type: item.completed

server/packages/sandbox-agent/tests/snapshots/http_sse_snapshots__run_http_events_snapshot@http_events_codex.snap

@@ -1,36 +1,91 @@
 ---
 source: server/packages/sandbox-agent/tests/http_sse_snapshots.rs
-assertion_line: 697
 expression: normalized
 ---
-- agent: codex
-  kind: started
+- metadata: true
   seq: 1
-  started:
-    message: session.created
-- agent: codex
-  kind: started
+  session: started
+  source: daemon
+  synthetic: true
+  type: session.started
+- metadata: true
   seq: 2
-  started:
-    message: thread/started
-- agent: codex
-  kind: started
+  session: started
+  source: agent
+  synthetic: false
+  type: session.started
+- item:
+    content_types:
+      - status
+    kind: status
+    role: system
+    status: completed
   seq: 3
-  started:
-    message: turn/started
-- agent: codex
-  kind: message
-  message:
-    parts:
-      - text: "<redacted>"
-        type: text
+  source: agent
+  synthetic: false
+  type: item.completed
+- item:
+    content_types:
+      - text
+    kind: message
     role: user
+    status: in_progress
   seq: 4
-- agent: codex
-  kind: message
-  message:
-    parts:
-      - text: "<redacted>"
-        type: text
-    role: assistant
+  source: agent
+  synthetic: false
+  type: item.started
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
   seq: 5
+  source: daemon
+  synthetic: true
+  type: item.delta
+- item:
+    content_types:
+      - text
+    kind: message
+    role: user
+    status: completed
+  seq: 6
+  source: agent
+  synthetic: false
+  type: item.completed
+- item:
+    content_types: []
+    kind: message
+    role: assistant
+    status: in_progress
+  seq: 7
+  source: agent
+  synthetic: false
+  type: item.started
+- item:
+    content_types:
+      - status
+    kind: status
+    role: system
+    status: completed
+  seq: 8
+  source: agent
+  synthetic: false
+  type: item.completed
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 9
+  source: agent
+  synthetic: false
+  type: item.delta
+- item:
+    content_types:
+      - reasoning
+    kind: message
+    role: assistant
+    status: completed
+  seq: 10
+  source: agent
+  synthetic: false
+  type: item.completed

server/packages/sandbox-agent/tests/snapshots/http_sse_snapshots__run_sse_events_snapshot@sse_events_codex.snap

@@ -1,36 +1,109 @@
 ---
 source: server/packages/sandbox-agent/tests/http_sse_snapshots.rs
-assertion_line: 734
 expression: normalized
 ---
-- agent: codex
-  kind: started
+- metadata: true
   seq: 1
-  started:
-    message: session.created
-- agent: codex
-  kind: started
+  session: started
+  source: daemon
+  synthetic: true
+  type: session.started
+- item:
+    content_types:
+      - status
+    kind: status
+    role: system
+    status: completed
   seq: 2
-  started:
-    message: thread/started
-- agent: codex
-  kind: started
-  seq: 3
-  started:
-    message: turn/started
-- agent: codex
-  kind: message
-  message:
-    parts:
-      - text: "<redacted>"
-        type: text
+  source: agent
+  synthetic: false
+  type: item.completed
+- item:
+    content_types:
+      - text
+    kind: message
     role: user
+    status: in_progress
+  seq: 3
+  source: agent
+  synthetic: false
+  type: item.started
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
   seq: 4
-- agent: codex
-  kind: message
-  message:
-    parts:
-      - text: "<redacted>"
-        type: text
-    role: assistant
+  source: daemon
+  synthetic: true
+  type: item.delta
+- item:
+    content_types:
+      - text
+    kind: message
+    role: user
+    status: completed
   seq: 5
+  source: agent
+  synthetic: false
+  type: item.completed
+- item:
+    content_types: []
+    kind: message
+    role: assistant
+    status: in_progress
+  seq: 6
+  source: agent
+  synthetic: false
+  type: item.started
+- item:
+    content_types:
+      - status
+    kind: status
+    role: system
+    status: completed
+  seq: 7
+  source: agent
+  synthetic: false
+  type: item.completed
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 8
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 9
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 10
+  source: agent
+  synthetic: false
+  type: item.delta
+- delta:
+    delta: "<redacted>"
+    item_id: "<redacted>"
+    native_item_id: "<redacted>"
+  seq: 11
+  source: agent
+  synthetic: false
+  type: item.delta
+- item:
+    content_types:
+      - reasoning
+    kind: message
+    role: assistant
+    status: completed
+  seq: 12
+  source: agent
+  synthetic: false
+  type: item.completed

server/packages/universal-agent-schema/src/agents/claude.rs

@@ -31,10 +31,10 @@ pub fn event_to_universal_with_session(
     let event_type = event.get("type").and_then(Value::as_str).unwrap_or("");
     let mut conversions = match event_type {
         "system" => vec![system_event_to_universal(event)],
-        "assistant" => assistant_event_to_universal(event),
-        "tool_use" => tool_use_event_to_universal(event, session_id),
+        "assistant" => assistant_event_to_universal(event, &session_id),
+        "tool_use" => tool_use_event_to_universal(event, &session_id),
         "tool_result" => tool_result_event_to_universal(event),
-        "result" => result_event_to_universal(event),
+        "result" => result_event_to_universal(event, &session_id),
         _ => return Err(format!("unsupported Claude event type: {event_type}")),
     };
 
@@ -53,7 +53,7 @@ fn system_event_to_universal(event: &Value) -> EventConversion {
         .with_raw(Some(event.clone()))
 }
 
-fn assistant_event_to_universal(event: &Value) -> Vec<EventConversion> {
+fn assistant_event_to_universal(event: &Value, session_id: &str) -> Vec<EventConversion> {
     let mut conversions = Vec::new();
     let content = event
         .get("message")
@@ -62,7 +62,8 @@ fn assistant_event_to_universal(event: &Value) -> Vec<EventConversion> {
         .cloned()
         .unwrap_or_default();
 
-    let message_id = next_temp_id("tmp_claude_message");
+    // Use session-based native_item_id so `result` event can reference the same item
+    let native_message_id = format!("{session_id}_message");
     let mut message_parts = Vec::new();
 
     for block in content {
@@ -85,9 +86,9 @@ fn assistant_event_to_universal(event: &Value) -> Vec<EventConversion> {
                         .unwrap_or_else(|| next_temp_id("tmp_claude_tool"));
                     let arguments = serde_json::to_string(&input).unwrap_or_else(|_| "{}".to_string());
                     let tool_item = UniversalItem {
-                        item_id: next_temp_id("tmp_claude_tool_item"),
+                        item_id: String::new(),
                         native_item_id: Some(call_id.clone()),
-                        parent_id: Some(message_id.clone()),
+                        parent_id: Some(native_message_id.clone()),
                         kind: ItemKind::ToolCall,
                         role: Some(ItemRole::Assistant),
                         content: vec![ContentPart::ToolCall {
@@ -106,21 +107,23 @@ fn assistant_event_to_universal(event: &Value) -> Vec<EventConversion> {
         }
     }
 
+    // `assistant` event emits item.started + item.delta only (in-progress state)
+    // The `result` event will emit item.completed to finalize
     let message_item = UniversalItem {
-        item_id: message_id,
-        native_item_id: None,
+        item_id: String::new(),
+        native_item_id: Some(native_message_id.clone()),
         parent_id: None,
         kind: ItemKind::Message,
         role: Some(ItemRole::Assistant),
         content: message_parts.clone(),
-        status: ItemStatus::Completed,
+        status: ItemStatus::InProgress,
     };
 
-    conversions.extend(message_events(message_item, message_parts, true));
+    conversions.extend(message_started_events(message_item, message_parts));
     conversions
 }
 
-fn tool_use_event_to_universal(event: &Value, session_id: String) -> Vec<EventConversion> {
+fn tool_use_event_to_universal(event: &Value, session_id: &str) -> Vec<EventConversion> {
     let mut conversions = Vec::new();
     let tool_use = event.get("tool_use");
     let name = tool_use
@@ -156,7 +159,7 @@ fn tool_use_event_to_universal(event: &Value, session_id: String) -> Vec<EventCo
 
     let arguments = serde_json::to_string(&input).unwrap_or_else(|_| "{}".to_string());
     let tool_item = UniversalItem {
-        item_id: next_temp_id("tmp_claude_tool_item"),
+        item_id: String::new(),
         native_item_id: Some(id.clone()),
         parent_id: None,
         kind: ItemKind::ToolCall,
@@ -222,22 +225,30 @@ fn tool_result_event_to_universal(event: &Value) -> Vec<EventConversion> {
     conversions
 }
 
-fn result_event_to_universal(event: &Value) -> Vec<EventConversion> {
+fn result_event_to_universal(event: &Value, session_id: &str) -> Vec<EventConversion> {
+    // The `result` event completes the message started by `assistant`.
+    // Use the same native_item_id so they link to the same universal item.
+    let native_message_id = format!("{session_id}_message");
     let result_text = event
         .get("result")
         .and_then(Value::as_str)
         .unwrap_or("")
         .to_string();
+
     let message_item = UniversalItem {
-        item_id: next_temp_id("tmp_claude_result"),
-        native_item_id: None,
+        item_id: String::new(),
+        native_item_id: Some(native_message_id),
         parent_id: None,
         kind: ItemKind::Message,
         role: Some(ItemRole::Assistant),
-        content: vec![ContentPart::Text { text: result_text.clone() }],
+        content: vec![ContentPart::Text { text: result_text }],
         status: ItemStatus::Completed,
     };
-    message_events(message_item, vec![ContentPart::Text { text: result_text }], true)
+
+    vec![EventConversion::new(
+        UniversalEventType::ItemCompleted,
+        UniversalEventData::Item(ItemEventData { item: message_item }),
+    )]
 }
 
 fn item_events(item: UniversalItem, synthetic_start: bool) -> Vec<EventConversion> {
@@ -260,20 +271,18 @@ fn item_events(item: UniversalItem, synthetic_start: bool) -> Vec<EventConversio
     events
 }
 
-fn message_events(item: UniversalItem, parts: Vec<ContentPart>, synthetic_start: bool) -> Vec<EventConversion> {
+/// Emits item.started + item.delta only (for `assistant` event).
+/// The item.completed will come from the `result` event.
+fn message_started_events(item: UniversalItem, parts: Vec<ContentPart>) -> Vec<EventConversion> {
     let mut events = Vec::new();
-    if synthetic_start {
-        let mut started_item = item.clone();
-        started_item.status = ItemStatus::InProgress;
-        events.push(
-            EventConversion::new(
-                UniversalEventType::ItemStarted,
-                UniversalEventData::Item(ItemEventData { item: started_item }),
-            )
-            .synthetic(),
-        );
-    }
 
+    // Emit item.started (in-progress)
+    events.push(EventConversion::new(
+        UniversalEventType::ItemStarted,
+        UniversalEventData::Item(ItemEventData { item: item.clone() }),
+    ));
+
+    // Emit item.delta with the text content
     let mut delta_text = String::new();
     for part in &parts {
         if let ContentPart::Text { text } = part {
@@ -281,23 +290,16 @@ fn message_events(item: UniversalItem, parts: Vec<ContentPart>, synthetic_start:
         }
     }
     if !delta_text.is_empty() {
-        events.push(
-            EventConversion::new(
-                UniversalEventType::ItemDelta,
-                UniversalEventData::ItemDelta(crate::ItemDeltaData {
-                    item_id: item.item_id.clone(),
-                    native_item_id: item.native_item_id.clone(),
-                    delta: delta_text,
-                }),
-            )
-            .synthetic(),
-        );
+        events.push(EventConversion::new(
+            UniversalEventType::ItemDelta,
+            UniversalEventData::ItemDelta(crate::ItemDeltaData {
+                item_id: item.item_id.clone(),
+                native_item_id: item.native_item_id.clone(),
+                delta: delta_text,
+            }),
+        ));
     }
 
-    events.push(EventConversion::new(
-        UniversalEventType::ItemCompleted,
-        UniversalEventData::Item(ItemEventData { item }),
-    ));
     events
 }
 

spec/universal-schema.json

@@ -0,0 +1,553 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "UniversalEvent",
+  "type": "object",
+  "required": [
+    "data",
+    "event_id",
+    "sequence",
+    "session_id",
+    "source",
+    "synthetic",
+    "time",
+    "type"
+  ],
+  "properties": {
+    "data": {
+      "$ref": "#/definitions/UniversalEventData"
+    },
+    "event_id": {
+      "type": "string"
+    },
+    "native_session_id": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "raw": true,
+    "sequence": {
+      "type": "integer",
+      "format": "uint64",
+      "minimum": 0.0
+    },
+    "session_id": {
+      "type": "string"
+    },
+    "source": {
+      "$ref": "#/definitions/EventSource"
+    },
+    "synthetic": {
+      "type": "boolean"
+    },
+    "time": {
+      "type": "string"
+    },
+    "type": {
+      "$ref": "#/definitions/UniversalEventType"
+    }
+  },
+  "definitions": {
+    "AgentUnparsedData": {
+      "type": "object",
+      "required": [
+        "error",
+        "location"
+      ],
+      "properties": {
+        "error": {
+          "type": "string"
+        },
+        "location": {
+          "type": "string"
+        },
+        "raw_hash": {
+          "type": [
+            "string",
+            "null"
+          ]
+        }
+      }
+    },
+    "ContentPart": {
+      "oneOf": [
+        {
+          "type": "object",
+          "required": [
+            "text",
+            "type"
+          ],
+          "properties": {
+            "text": {
+              "type": "string"
+            },
+            "type": {
+              "type": "string",
+              "enum": [
+                "text"
+              ]
+            }
+          }
+        },
+        {
+          "type": "object",
+          "required": [
+            "json",
+            "type"
+          ],
+          "properties": {
+            "json": true,
+            "type": {
+              "type": "string",
+              "enum": [
+                "json"
+              ]
+            }
+          }
+        },
+        {
+          "type": "object",
+          "required": [
+            "arguments",
+            "call_id",
+            "name",
+            "type"
+          ],
+          "properties": {
+            "arguments": {
+              "type": "string"
+            },
+            "call_id": {
+              "type": "string"
+            },
+            "name": {
+              "type": "string"
+            },
+            "type": {
+              "type": "string",
+              "enum": [
+                "tool_call"
+              ]
+            }
+          }
+        },
+        {
+          "type": "object",
+          "required": [
+            "call_id",
+            "output",
+            "type"
+          ],
+          "properties": {
+            "call_id": {
+              "type": "string"
+            },
+            "output": {
+              "type": "string"
+            },
+            "type": {
+              "type": "string",
+              "enum": [
+                "tool_result"
+              ]
+            }
+          }
+        },
+        {
+          "type": "object",
+          "required": [
+            "action",
+            "path",
+            "type"
+          ],
+          "properties": {
+            "action": {
+              "$ref": "#/definitions/FileAction"
+            },
+            "diff": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "path": {
+              "type": "string"
+            },
+            "type": {
+              "type": "string",
+              "enum": [
+                "file_ref"
+              ]
+            }
+          }
+        },
+        {
+          "type": "object",
+          "required": [
+            "text",
+            "type",
+            "visibility"
+          ],
+          "properties": {
+            "text": {
+              "type": "string"
+            },
+            "type": {
+              "type": "string",
+              "enum": [
+                "reasoning"
+              ]
+            },
+            "visibility": {
+              "$ref": "#/definitions/ReasoningVisibility"
+            }
+          }
+        },
+        {
+          "type": "object",
+          "required": [
+            "path",
+            "type"
+          ],
+          "properties": {
+            "mime": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "path": {
+              "type": "string"
+            },
+            "type": {
+              "type": "string",
+              "enum": [
+                "image"
+              ]
+            }
+          }
+        },
+        {
+          "type": "object",
+          "required": [
+            "label",
+            "type"
+          ],
+          "properties": {
+            "detail": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "label": {
+              "type": "string"
+            },
+            "type": {
+              "type": "string",
+              "enum": [
+                "status"
+              ]
+            }
+          }
+        }
+      ]
+    },
+    "ErrorData": {
+      "type": "object",
+      "required": [
+        "message"
+      ],
+      "properties": {
+        "code": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "details": true,
+        "message": {
+          "type": "string"
+        }
+      }
+    },
+    "EventSource": {
+      "type": "string",
+      "enum": [
+        "agent",
+        "daemon"
+      ]
+    },
+    "FileAction": {
+      "type": "string",
+      "enum": [
+        "read",
+        "write",
+        "patch"
+      ]
+    },
+    "ItemDeltaData": {
+      "type": "object",
+      "required": [
+        "delta",
+        "item_id"
+      ],
+      "properties": {
+        "delta": {
+          "type": "string"
+        },
+        "item_id": {
+          "type": "string"
+        },
+        "native_item_id": {
+          "type": [
+            "string",
+            "null"
+          ]
+        }
+      }
+    },
+    "ItemEventData": {
+      "type": "object",
+      "required": [
+        "item"
+      ],
+      "properties": {
+        "item": {
+          "$ref": "#/definitions/UniversalItem"
+        }
+      }
+    },
+    "ItemKind": {
+      "type": "string",
+      "enum": [
+        "message",
+        "tool_call",
+        "tool_result",
+        "system",
+        "status",
+        "unknown"
+      ]
+    },
+    "ItemRole": {
+      "type": "string",
+      "enum": [
+        "user",
+        "assistant",
+        "system",
+        "tool"
+      ]
+    },
+    "ItemStatus": {
+      "type": "string",
+      "enum": [
+        "in_progress",
+        "completed",
+        "failed"
+      ]
+    },
+    "PermissionEventData": {
+      "type": "object",
+      "required": [
+        "action",
+        "permission_id",
+        "status"
+      ],
+      "properties": {
+        "action": {
+          "type": "string"
+        },
+        "metadata": true,
+        "permission_id": {
+          "type": "string"
+        },
+        "status": {
+          "$ref": "#/definitions/PermissionStatus"
+        }
+      }
+    },
+    "PermissionStatus": {
+      "type": "string",
+      "enum": [
+        "requested",
+        "approved",
+        "denied"
+      ]
+    },
+    "QuestionEventData": {
+      "type": "object",
+      "required": [
+        "options",
+        "prompt",
+        "question_id",
+        "status"
+      ],
+      "properties": {
+        "options": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "prompt": {
+          "type": "string"
+        },
+        "question_id": {
+          "type": "string"
+        },
+        "response": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "status": {
+          "$ref": "#/definitions/QuestionStatus"
+        }
+      }
+    },
+    "QuestionStatus": {
+      "type": "string",
+      "enum": [
+        "requested",
+        "answered",
+        "rejected"
+      ]
+    },
+    "ReasoningVisibility": {
+      "type": "string",
+      "enum": [
+        "public",
+        "private"
+      ]
+    },
+    "SessionEndReason": {
+      "type": "string",
+      "enum": [
+        "completed",
+        "error",
+        "terminated"
+      ]
+    },
+    "SessionEndedData": {
+      "type": "object",
+      "required": [
+        "reason",
+        "terminated_by"
+      ],
+      "properties": {
+        "reason": {
+          "$ref": "#/definitions/SessionEndReason"
+        },
+        "terminated_by": {
+          "$ref": "#/definitions/TerminatedBy"
+        }
+      }
+    },
+    "SessionStartedData": {
+      "type": "object",
+      "properties": {
+        "metadata": true
+      }
+    },
+    "TerminatedBy": {
+      "type": "string",
+      "enum": [
+        "agent",
+        "daemon"
+      ]
+    },
+    "UniversalEventData": {
+      "anyOf": [
+        {
+          "$ref": "#/definitions/SessionStartedData"
+        },
+        {
+          "$ref": "#/definitions/SessionEndedData"
+        },
+        {
+          "$ref": "#/definitions/ItemEventData"
+        },
+        {
+          "$ref": "#/definitions/ItemDeltaData"
+        },
+        {
+          "$ref": "#/definitions/ErrorData"
+        },
+        {
+          "$ref": "#/definitions/PermissionEventData"
+        },
+        {
+          "$ref": "#/definitions/QuestionEventData"
+        },
+        {
+          "$ref": "#/definitions/AgentUnparsedData"
+        }
+      ]
+    },
+    "UniversalEventType": {
+      "type": "string",
+      "enum": [
+        "session.started",
+        "session.ended",
+        "item.started",
+        "item.delta",
+        "item.completed",
+        "error",
+        "permission.requested",
+        "permission.resolved",
+        "question.requested",
+        "question.resolved",
+        "agent.unparsed"
+      ]
+    },
+    "UniversalItem": {
+      "type": "object",
+      "required": [
+        "content",
+        "item_id",
+        "kind",
+        "status"
+      ],
+      "properties": {
+        "content": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/ContentPart"
+          }
+        },
+        "item_id": {
+          "type": "string"
+        },
+        "kind": {
+          "$ref": "#/definitions/ItemKind"
+        },
+        "native_item_id": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "parent_id": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "role": {
+          "anyOf": [
+            {
+              "$ref": "#/definitions/ItemRole"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "status": {
+          "$ref": "#/definitions/ItemStatus"
+        }
+      }
+    }
+  }
+}

todo.md

@@ -2,3 +2,7 @@
 
 - [x] Replace server --mock flag with built-in mock agent and update UI approvals layout.
 - [x] Add telemetry module with opt-out flag and sandbox provider detection.
+- [x] Add turn-stream message endpoint with SSE response and tests.
+- [x] Update CLI + TypeScript SDK/OpenAPI for turn streaming.
+- [x] Add inspector UI mode for turn stream and wire send flow.
+- [x] Refresh docs for new endpoint and UI mode.