diff --git a/.turbo b/.turbo
new file mode 120000
index 0000000..0b7d9ca
--- /dev/null
+++ b/.turbo
@@ -0,0 +1 @@
+/home/nathan/sandbox-agent/.turbo
\ No newline at end of file
diff --git a/dist b/dist
new file mode 120000
index 0000000..f02d77f
--- /dev/null
+++ b/dist
@@ -0,0 +1 @@
+/home/nathan/sandbox-agent/dist
\ No newline at end of file
diff --git a/node_modules b/node_modules
new file mode 120000
index 0000000..501480b
--- /dev/null
+++ b/node_modules
@@ -0,0 +1 @@
+/home/nathan/sandbox-agent/node_modules
\ No newline at end of file
diff --git a/server/packages/sandbox-agent/src/opencode_compat.rs b/server/packages/sandbox-agent/src/opencode_compat.rs
index 427d440..93357a8 100644
--- a/server/packages/sandbox-agent/src/opencode_compat.rs
+++ b/server/packages/sandbox-agent/src/opencode_compat.rs
@@ -460,6 +460,51 @@ struct DirectoryQuery {
     directory: Option<String>,
 }
 
+#[derive(Debug, Deserialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+struct TuiAppendPromptRequest {
+    text: String,
+}
+
+#[derive(Debug, Deserialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+struct TuiExecuteCommandRequest {
+    command: String,
+}
+
+#[derive(Debug, Deserialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+struct TuiShowToastRequest {
+    title: Option<String>,
+    message: String,
+    variant: String,
+    duration: Option<f64>,
+}
+
+#[derive(Debug, Deserialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+struct TuiSelectSessionRequest {
+    #[serde(rename = "sessionID")]
+    session_id: String,
+}
+
+#[derive(Debug, Deserialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+struct TuiPublishRequest {
+    #[serde(rename = "type")]
+    event_type: String,
+    properties: Value,
+}
+
+#[derive(Debug, Deserialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+struct TuiControlResponseRequest {
+    #[serde(rename = "requestID")]
+    request_id: String,
+    body: Option<Value>,
+    error: Option<Value>,
+}
+
 #[derive(Debug, Deserialize, IntoParams)]
 struct ToolQuery {
     directory: Option<String>,
@@ -4088,29 +4133,79 @@ async fn oc_skill_list() -> impl IntoResponse {
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_next() -> impl IntoResponse {
+async fn oc_tui_next(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    let next = state
+        .inner
+        .session_manager()
+        .next_tui_control(directory)
+        .await;
+    if let Some(request) = next {
+        return (
+            StatusCode::OK,
+            Json(json!({
+                "path": request.path,
+                "body": request.body,
+                "requestID": request.id,
+            })),
+        );
+    }
     (StatusCode::OK, Json(json!({"path": "", "body": {}})))
 }
 
 #[utoipa::path(
     post,
     path = "/tui/control/response",
-    request_body = String,
+    request_body = TuiControlResponseRequest,
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_response() -> impl IntoResponse {
-    bool_ok(true)
+async fn oc_tui_response(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+    Json(body): Json<TuiControlResponseRequest>,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    let response = json!({
+        "body": body.body,
+        "error": body.error,
+    });
+    let accepted = state
+        .inner
+        .session_manager()
+        .respond_tui_control(directory, &body.request_id, response)
+        .await;
+    bool_ok(accepted)
 }
 
 #[utoipa::path(
     post,
     path = "/tui/append-prompt",
-    request_body = String,
+    request_body = TuiAppendPromptRequest,
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_append_prompt() -> impl IntoResponse {
+async fn oc_tui_append_prompt(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+    Json(body): Json<TuiAppendPromptRequest>,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(
+            directory,
+            "/tui/append-prompt".to_string(),
+            json!({"text": body.text}),
+        )
+        .await;
     bool_ok(true)
 }
 
@@ -4120,7 +4215,17 @@ async fn oc_tui_append_prompt() -> impl IntoResponse {
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_open_help() -> impl IntoResponse {
+async fn oc_tui_open_help(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(directory, "/tui/open-help".to_string(), json!({}))
+        .await;
     bool_ok(true)
 }
 
@@ -4130,7 +4235,17 @@ async fn oc_tui_open_help() -> impl IntoResponse {
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_open_sessions() -> impl IntoResponse {
+async fn oc_tui_open_sessions(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(directory, "/tui/open-sessions".to_string(), json!({}))
+        .await;
     bool_ok(true)
 }
 
@@ -4140,7 +4255,17 @@ async fn oc_tui_open_sessions() -> impl IntoResponse {
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_open_themes() -> impl IntoResponse {
+async fn oc_tui_open_themes(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(directory, "/tui/open-themes".to_string(), json!({}))
+        .await;
     bool_ok(true)
 }
 
@@ -4150,18 +4275,37 @@ async fn oc_tui_open_themes() -> impl IntoResponse {
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_open_models() -> impl IntoResponse {
+async fn oc_tui_open_models(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(directory, "/tui/open-models".to_string(), json!({}))
+        .await;
     bool_ok(true)
 }
 
 #[utoipa::path(
     post,
     path = "/tui/submit-prompt",
-    request_body = String,
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_submit_prompt() -> impl IntoResponse {
+async fn oc_tui_submit_prompt(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(directory, "/tui/submit-prompt".to_string(), json!({}))
+        .await;
     bool_ok(true)
 }
 
@@ -4171,51 +4315,179 @@ async fn oc_tui_submit_prompt() -> impl IntoResponse {
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_clear_prompt() -> impl IntoResponse {
+async fn oc_tui_clear_prompt(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(directory, "/tui/clear-prompt".to_string(), json!({}))
+        .await;
     bool_ok(true)
 }
 
 #[utoipa::path(
     post,
     path = "/tui/execute-command",
-    request_body = String,
+    request_body = TuiExecuteCommandRequest,
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_execute_command() -> impl IntoResponse {
+async fn oc_tui_execute_command(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+    Json(body): Json<TuiExecuteCommandRequest>,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(
+            directory,
+            "/tui/execute-command".to_string(),
+            json!({"command": body.command}),
+        )
+        .await;
     bool_ok(true)
 }
 
 #[utoipa::path(
     post,
     path = "/tui/show-toast",
-    request_body = String,
+    request_body = TuiShowToastRequest,
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_show_toast() -> impl IntoResponse {
+async fn oc_tui_show_toast(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+    Json(body): Json<TuiShowToastRequest>,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(
+            directory,
+            "/tui/show-toast".to_string(),
+            json!({
+                "title": body.title,
+                "message": body.message,
+                "variant": body.variant,
+                "duration": body.duration,
+            }),
+        )
+        .await;
     bool_ok(true)
 }
 
 #[utoipa::path(
     post,
     path = "/tui/publish",
-    request_body = String,
+    request_body = TuiPublishRequest,
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_publish() -> impl IntoResponse {
+async fn oc_tui_publish(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+    Json(body): Json<TuiPublishRequest>,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    let (path, payload) = match body.event_type.as_str() {
+        "tui.prompt.append" => {
+            let Some(text) = body.properties.get("text").and_then(|v| v.as_str()) else {
+                return bad_request("text is required").into_response();
+            };
+            ("/tui/append-prompt", json!({"text": text}))
+        }
+        "tui.command.execute" => {
+            let Some(command) = body
+                .properties
+                .get("command")
+                .and_then(|v| v.as_str())
+            else {
+                return bad_request("command is required").into_response();
+            };
+            ("/tui/execute-command", json!({"command": command}))
+        }
+        "tui.toast.show" => {
+            let Some(message) = body.properties.get("message").and_then(|v| v.as_str()) else {
+                return bad_request("message is required").into_response();
+            };
+            let Some(variant) = body.properties.get("variant").and_then(|v| v.as_str()) else {
+                return bad_request("variant is required").into_response();
+            };
+            let title = body.properties.get("title").cloned();
+            let duration = body.properties.get("duration").cloned();
+            (
+                "/tui/show-toast",
+                json!({
+                    "title": title,
+                    "message": message,
+                    "variant": variant,
+                    "duration": duration,
+                }),
+            )
+        }
+        "tui.session.select" => {
+            let Some(session_id) = body
+                .properties
+                .get("sessionID")
+                .and_then(|v| v.as_str())
+            else {
+                return bad_request("sessionID is required").into_response();
+            };
+            let sessions = state.opencode.sessions.lock().await;
+            if !sessions.contains_key(session_id) {
+                return not_found("session not found").into_response();
+            }
+            ("/tui/select-session", json!({"sessionID": session_id}))
+        }
+        _ => return bad_request("unsupported TUI event").into_response(),
+    };
+
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(directory, path.to_string(), payload)
+        .await;
     bool_ok(true)
 }
 
 #[utoipa::path(
     post,
     path = "/tui/select-session",
-    request_body = String,
+    request_body = TuiSelectSessionRequest,
     responses((status = 200)),
     tag = "opencode"
 )]
-async fn oc_tui_select_session() -> impl IntoResponse {
+async fn oc_tui_select_session(
+    State(state): State<Arc<OpenCodeAppState>>,
+    Query(query): Query<DirectoryQuery>,
+    headers: HeaderMap,
+    Json(body): Json<TuiSelectSessionRequest>,
+) -> impl IntoResponse {
+    let directory = state.opencode.directory_for(&headers, query.directory.as_ref());
+    let sessions = state.opencode.sessions.lock().await;
+    if !sessions.contains_key(&body.session_id) {
+        return not_found("session not found").into_response();
+    }
+    state
+        .inner
+        .session_manager()
+        .enqueue_tui_control(
+            directory,
+            "/tui/select-session".to_string(),
+            json!({"sessionID": body.session_id}),
+        )
+        .await;
     bool_ok(true)
 }
 
diff --git a/server/packages/sandbox-agent/src/router.rs b/server/packages/sandbox-agent/src/router.rs
index 92460d5..c57fed8 100644
--- a/server/packages/sandbox-agent/src/router.rs
+++ b/server/packages/sandbox-agent/src/router.rs
@@ -50,6 +50,7 @@ use sandbox_agent_agent_management::credentials::{
 
 const MOCK_EVENT_DELAY_MS: u64 = 200;
 static USER_MESSAGE_COUNTER: AtomicU64 = AtomicU64::new(1);
+static TUI_CONTROL_COUNTER: AtomicU64 = AtomicU64::new(1);
 
 #[derive(Debug)]
 pub struct AppState {
@@ -360,6 +361,20 @@ struct PendingQuestion {
     options: Vec<String>,
 }
 
+#[derive(Debug, Clone)]
+pub(crate) struct TuiControlRequest {
+    pub(crate) id: String,
+    pub(crate) path: String,
+    pub(crate) body: Value,
+}
+
+#[derive(Debug, Default)]
+struct TuiControlQueue {
+    pending: VecDeque<TuiControlRequest>,
+    inflight: HashMap<String, TuiControlRequest>,
+    responses: HashMap<String, Value>,
+}
+
 impl SessionState {
     fn new(
         session_id: String,
@@ -818,6 +833,7 @@ pub(crate) struct SessionManager {
     sessions: Mutex<Vec<SessionState>>,
     server_manager: Arc<AgentServerManager>,
     http_client: Client,
+    tui_controls: Mutex<HashMap<String, TuiControlQueue>>,
 }
 
 /// Shared Codex app-server process that handles multiple sessions via JSON-RPC.
@@ -1538,6 +1554,7 @@ impl SessionManager {
             sessions: Mutex::new(Vec::new()),
             server_manager,
             http_client: Client::new(),
+            tui_controls: Mutex::new(HashMap::new()),
         }
     }
 
@@ -1960,6 +1977,59 @@ impl SessionManager {
         items
     }
 
+    pub(crate) async fn enqueue_tui_control(
+        &self,
+        directory: String,
+        path: String,
+        body: Value,
+    ) -> String {
+        let id = format!(
+            "tui_{}",
+            TUI_CONTROL_COUNTER.fetch_add(1, Ordering::Relaxed)
+        );
+        let request = TuiControlRequest {
+            id: id.clone(),
+            path,
+            body,
+        };
+        let mut controls = self.tui_controls.lock().await;
+        let queue = controls.entry(directory).or_default();
+        queue.pending.push_back(request);
+        id
+    }
+
+    pub(crate) async fn next_tui_control(
+        &self,
+        directory: String,
+    ) -> Option<TuiControlRequest> {
+        let mut controls = self.tui_controls.lock().await;
+        let queue = controls.entry(directory).or_default();
+        if let Some(request) = queue.pending.pop_front() {
+            queue
+                .inflight
+                .insert(request.id.clone(), request.clone());
+            return Some(request);
+        }
+        None
+    }
+
+    pub(crate) async fn respond_tui_control(
+        &self,
+        directory: String,
+        request_id: &str,
+        response: Value,
+    ) -> bool {
+        let mut controls = self.tui_controls.lock().await;
+        let Some(queue) = controls.get_mut(&directory) else {
+            return false;
+        };
+        if queue.inflight.remove(request_id).is_some() {
+            queue.responses.insert(request_id.to_string(), response);
+            return true;
+        }
+        false
+    }
+
     async fn subscribe_for_turn(
         &self,
         session_id: &str,
diff --git a/server/packages/sandbox-agent/tests/opencode-compat/tui.test.ts b/server/packages/sandbox-agent/tests/opencode-compat/tui.test.ts
new file mode 100644
index 0000000..28ed3ed
--- /dev/null
+++ b/server/packages/sandbox-agent/tests/opencode-compat/tui.test.ts
@@ -0,0 +1,102 @@
+/**
+ * Tests for OpenCode-compatible TUI control endpoints.
+ */
+
+import { describe, it, expect, beforeAll, beforeEach, afterEach } from "vitest";
+import { createOpencodeClient, type OpencodeClient } from "@opencode-ai/sdk";
+import { spawnSandboxAgent, buildSandboxAgent, type SandboxAgentHandle } from "./helpers/spawn";
+
+type TuiClient = {
+  appendPrompt: (args: unknown) => Promise<{ data?: unknown }>;
+  executeCommand: (args: unknown) => Promise<{ data?: unknown }>;
+  showToast: (args: unknown) => Promise<{ data?: unknown }>;
+  control: {
+    next: (args?: unknown) => Promise<{ data?: unknown }>;
+    response: (args: unknown) => Promise<{ data?: unknown }>;
+  };
+};
+
+describe("OpenCode-compatible TUI Control API", () => {
+  let handle: SandboxAgentHandle;
+  let client: OpencodeClient;
+  let tui: TuiClient;
+
+  beforeAll(async () => {
+    await buildSandboxAgent();
+  });
+
+  beforeEach(async () => {
+    handle = await spawnSandboxAgent({ opencodeCompat: true });
+    client = createOpencodeClient({
+      baseUrl: `${handle.baseUrl}/opencode`,
+      headers: { Authorization: `Bearer ${handle.token}` },
+    });
+    tui = client.tui as unknown as TuiClient;
+  });
+
+  afterEach(async () => {
+    await handle?.dispose();
+  });
+
+  it("queues TUI control requests in order", async () => {
+    await tui.appendPrompt({ body: { text: "First" } });
+    await tui.executeCommand({ body: { command: "prompt.clear" } });
+    await tui.showToast({ body: { message: "Hello", variant: "info" } });
+
+    const first = (await tui.control.next({})).data as {
+      path: string;
+      body: { text?: string };
+      requestID?: string;
+    };
+    const second = (await tui.control.next({})).data as {
+      path: string;
+      body: { command?: string };
+      requestID?: string;
+    };
+    const third = (await tui.control.next({})).data as {
+      path: string;
+      body: { message?: string };
+      requestID?: string;
+    };
+
+    expect(first.path).toBe("/tui/append-prompt");
+    expect(first.body.text).toBe("First");
+    expect(first.requestID).toBeDefined();
+
+    expect(second.path).toBe("/tui/execute-command");
+    expect(second.body.command).toBe("prompt.clear");
+    expect(second.requestID).toBeDefined();
+
+    expect(third.path).toBe("/tui/show-toast");
+    expect(third.body.message).toBe("Hello");
+    expect(third.requestID).toBeDefined();
+
+    const empty = (await tui.control.next({})).data as {
+      path: string;
+      body: Record<string, unknown>;
+    };
+    expect(empty.path).toBe("");
+    expect(empty.body).toEqual({});
+  });
+
+  it("handles control responses with request IDs", async () => {
+    await tui.appendPrompt({ body: { text: "Ack me" } });
+    const next = (await tui.control.next({})).data as { requestID?: string };
+    expect(next.requestID).toBeDefined();
+
+    const accepted = await tui.control.response({
+      body: { requestID: next.requestID, body: { ok: true } },
+    });
+    expect(accepted.data).toBe(true);
+
+    const duplicate = await tui.control.response({
+      body: { requestID: next.requestID, body: { ok: false } },
+    });
+    expect(duplicate.data).toBe(false);
+
+    const missing = await tui.control.response({
+      body: { requestID: "tui_missing" },
+    });
+    expect(missing.data).toBe(false);
+  });
+});
diff --git a/target b/target
new file mode 120000
index 0000000..3d6ad8c
--- /dev/null
+++ b/target
@@ -0,0 +1 @@
+/home/nathan/sandbox-agent/target
\ No newline at end of file