40 lines
1.9 KiB
Markdown
40 lines
1.9 KiB
Markdown
---
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name: pi-extension-lifecycle
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description: Pi extension lifecycle and registration patterns. Use when adding or reviewing extension tools, commands, resources, providers, event handlers, session hooks, or context-sensitive Pi API usage.
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---
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# pi-extension-lifecycle
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Use this skill when working on Pi extension registration or lifecycle behavior.
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## Source patterns distilled
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- Pi core: `source/pi-mono/packages/coding-agent/src/core/extensions/types.ts`, `loader.ts`, `runner.ts`
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- Pi examples: `source/pi-mono/packages/coding-agent/examples/extensions/`
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- pi-crew extension entry: `src/extension/register.ts`, `src/extension/registration/*.ts`
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## Rules
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- Register tools, commands, shortcuts, widgets, providers, and event handlers from the extension factory or lifecycle callbacks.
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- Tool definitions should use a TypeBox schema and an `execute(toolCallId, params, signal, onUpdate, ctx)` handler.
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- Use fresh `ExtensionContext`/`ExtensionCommandContext` after session replacement (`newSession`, `fork`, `switchSession`, `reload`). Do not retain old context references for later work.
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- For session-scoped work, derive session identity from `ctx.sessionManager.getSessionId()` and pass it into pi-crew `TeamContext`.
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- Prefer small registration modules under `src/extension/registration/`; keep `index.ts` minimal.
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- Clean up intervals, event subscriptions, child processes, and watchers on session switch/shutdown.
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- Wrap optional Pi API hooks in compatibility checks/try-catch when supporting older Pi versions.
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## Anti-patterns
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- Do not use stale context objects after session switch.
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- Do not register duplicate tool/command names and assume override behavior.
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- Do not perform blocking filesystem or network work inside extension render callbacks.
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- Do not add hardcoded global keybindings without config or collision review.
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## Verification
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```bash
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cd pi-crew
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npx tsc --noEmit
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npm test
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```
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