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Allow extensions to modify system prompt in before_agent_start

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- Add systemPrompt to BeforeAgentStartEvent so extensions can see current prompt
- Change systemPromptAppend to systemPrompt in BeforeAgentStartEventResult for full replacement
- Extensions can now chain modifications (each sees the result of previous)
- Update ssh.ts to replace local cwd with remote cwd in system prompt
- Update pirate.ts, claude-rules.ts, preset.ts to use new API

fixes #575
This commit is contained in:
Mario Zechner 2026-01-08 19:54:34 +01:00
parent 0774db2e5a
commit 17cb328ca1
10 changed files with 65 additions and 27 deletions
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11
packages/coding-agent/docs/extensions.md
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@ -255,7 +255,7 @@ pi starts
▼
user sends prompt ─────────────────────────────────────────┐
│ │
├─► before_agent_start (can inject message, append to system prompt)
├─► before_agent_start (can inject message, modify system prompt)
├─► agent_start │
│ │
│ ┌─── turn (repeats while LLM calls tools) ───┐ │
@ -414,12 +414,13 @@ pi.on("session_shutdown", async (_event, ctx) => {
#### before_agent_start
Fired after user submits prompt, before agent loop. Can inject a message and/or append to the system prompt.
Fired after user submits prompt, before agent loop. Can inject a message and/or modify the system prompt.
```typescript
pi.on("before_agent_start", async (event, ctx) => {
// event.prompt - user's prompt text
// event.images - attached images (if any)
// event.systemPrompt - current system prompt
return {
// Inject a persistent message (stored in session, sent to LLM)
@ -428,13 +429,13 @@ pi.on("before_agent_start", async (event, ctx) => {
content: "Additional context for the LLM",
display: true,
},
// Append to system prompt for this turn only
systemPromptAppend: "Extra instructions for this turn...",
// Replace the system prompt for this turn (chained across extensions)
systemPrompt: event.systemPrompt + "\n\nExtra instructions for this turn...",
};
});
```
**Examples:** [claude-rules.ts](../examples/extensions/claude-rules.ts), [pirate.ts](../examples/extensions/pirate.ts), [plan-mode.ts](../examples/extensions/plan-mode.ts), [preset.ts](../examples/extensions/preset.ts)
**Examples:** [claude-rules.ts](../examples/extensions/claude-rules.ts), [pirate.ts](../examples/extensions/pirate.ts), [plan-mode.ts](../examples/extensions/plan-mode.ts), [preset.ts](../examples/extensions/preset.ts), [ssh.ts](../examples/extensions/ssh.ts)
#### agent_start / agent_end