co-mono/packages/coding-agent/docs/json.md
Mario Zechner 5340862910 docs(coding-agent): update README-NEW.md, tui.md, add new docs
- README-NEW.md: add environment variables, philosophy extras (no built-in to-dos, no background bash), session ID support, pi config command, plain git URLs, version pinning
- tui.md: fix hooks->extensions terminology, update Component interface (invalidate required, add wantsKeyRelease)
- Add new docs: settings.md, development.md, json.md
- Add screenshots: tree-view.png, doom-extension.png
2026-01-26 02:27:19 +01:00

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# JSON Event Stream Mode
```bash
pi --mode json "Your prompt"
```
Outputs all session events as JSON lines to stdout. Useful for integrating pi into other tools or custom UIs.
## Event Types
Events are defined in [`AgentSessionEvent`](https://github.com/badlogic/pi-mono/blob/main/packages/coding-agent/src/core/agent-session.ts#L102):
```typescript
type AgentSessionEvent =
| AgentEvent
| { type: "auto_compaction_start"; reason: "threshold" | "overflow" }
| { type: "auto_compaction_end"; result: CompactionResult | undefined; aborted: boolean; willRetry: boolean; errorMessage?: string }
| { type: "auto_retry_start"; attempt: number; maxAttempts: number; delayMs: number; errorMessage: string }
| { type: "auto_retry_end"; success: boolean; attempt: number; finalError?: string };
```
Base events from [`AgentEvent`](https://github.com/badlogic/pi-mono/blob/main/packages/agent/src/types.ts#L179):
```typescript
type AgentEvent =
// Agent lifecycle
| { type: "agent_start" }
| { type: "agent_end"; messages: AgentMessage[] }
// Turn lifecycle
| { type: "turn_start" }
| { type: "turn_end"; message: AgentMessage; toolResults: ToolResultMessage[] }
// Message lifecycle
| { type: "message_start"; message: AgentMessage }
| { type: "message_update"; message: AgentMessage; assistantMessageEvent: AssistantMessageEvent }
| { type: "message_end"; message: AgentMessage }
// Tool execution
| { type: "tool_execution_start"; toolCallId: string; toolName: string; args: any }
| { type: "tool_execution_update"; toolCallId: string; toolName: string; args: any; partialResult: any }
| { type: "tool_execution_end"; toolCallId: string; toolName: string; result: any; isError: boolean };
```
## Message Types
Base messages from [`packages/ai/src/types.ts`](https://github.com/badlogic/pi-mono/blob/main/packages/ai/src/types.ts#L134):
- `UserMessage` (line 134)
- `AssistantMessage` (line 140)
- `ToolResultMessage` (line 152)
Extended messages from [`packages/coding-agent/src/core/messages.ts`](https://github.com/badlogic/pi-mono/blob/main/packages/coding-agent/src/core/messages.ts#L29):
- `BashExecutionMessage` (line 29)
- `CustomMessage` (line 46)
- `BranchSummaryMessage` (line 55)
- `CompactionSummaryMessage` (line 62)
## Output Format
Each line is a JSON object. The first line is the session header:
```json
{"type":"session","version":3,"id":"uuid","timestamp":"...","cwd":"/path"}
```
Followed by events as they occur:
```json
{"type":"agent_start"}
{"type":"turn_start"}
{"type":"message_start","message":{"role":"assistant","content":[],...}}
{"type":"message_update","message":{...},"assistantMessageEvent":{"type":"text_delta","delta":"Hello",...}}
{"type":"message_end","message":{...}}
{"type":"turn_end","message":{...},"toolResults":[]}
{"type":"agent_end","messages":[...]}
```
## Example
```bash
pi --mode json "List files" 2>/dev/null | jq -c 'select(.type == "message_end")'
```