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98 lines
3.2 KiB
Markdown
98 lines
3.2 KiB
Markdown
# Hooks Examples
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Example hooks for pi-coding-agent.
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## Examples
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### permission-gate.ts
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Prompts for confirmation before running dangerous bash commands (rm -rf, sudo, chmod 777, etc.).
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### git-checkpoint.ts
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Creates git stash checkpoints at each turn, allowing code restoration when branching.
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### protected-paths.ts
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Blocks writes to protected paths (.env, .git/, node_modules/).
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### file-trigger.ts
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Watches a trigger file and injects its contents into the conversation. Useful for external systems (CI, file watchers, webhooks) to send messages to the agent.
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### confirm-destructive.ts
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Prompts for confirmation before destructive session actions (clear, switch, branch). Demonstrates how to cancel `before_*` session events.
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### dirty-repo-guard.ts
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Prevents session changes when there are uncommitted git changes. Blocks clear/switch/branch until you commit.
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### auto-commit-on-exit.ts
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Automatically commits changes when the agent exits (shutdown event). Uses the last assistant message to generate a commit message.
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### full-compaction.ts
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Custom context compaction that summarizes the entire conversation instead of keeping recent turns. Uses the `before_compact` hook event to intercept compaction and generate a comprehensive summary using `complete()` from the AI package. Useful when you want maximum context window space at the cost of losing exact conversation history.
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## Usage
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```bash
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# Test directly
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pi --hook examples/hooks/permission-gate.ts
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# Or copy to hooks directory for persistent use
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cp permission-gate.ts ~/.pi/agent/hooks/
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```
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## Writing Hooks
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See [docs/hooks.md](../../docs/hooks.md) for full documentation.
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### Key Points
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**Hook structure:**
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```typescript
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import type { HookAPI } from "@mariozechner/pi-coding-agent/hooks";
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export default function (pi: HookAPI) {
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pi.on("session", async (event, ctx) => {
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// event.reason: "start" | "before_switch" | "switch" | "before_clear" | "clear" |
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// "before_branch" | "branch" | "shutdown"
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// event.targetTurnIndex: number (only for before_branch/branch)
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// ctx.ui, ctx.exec, ctx.cwd, ctx.sessionFile, ctx.hasUI
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// Cancel before_* actions:
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if (event.reason === "before_clear") {
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return { cancel: true };
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}
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return undefined;
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});
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pi.on("tool_call", async (event, ctx) => {
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// Can block tool execution
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if (dangerous) {
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return { block: true, reason: "Blocked" };
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}
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return undefined;
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});
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pi.on("tool_result", async (event, ctx) => {
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// Can modify result
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return { result: "modified result" };
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});
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}
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```
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**Available events:**
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- `session` - lifecycle events with before/after variants (can cancel before_* actions)
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- `agent_start` / `agent_end` - per user prompt
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- `turn_start` / `turn_end` - per LLM turn
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- `tool_call` - before tool execution (can block)
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- `tool_result` - after tool execution (can modify)
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**UI methods:**
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```typescript
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const choice = await ctx.ui.select("Title", ["Option A", "Option B"]);
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const confirmed = await ctx.ui.confirm("Title", "Are you sure?");
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const input = await ctx.ui.input("Title", "placeholder");
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ctx.ui.notify("Message", "info"); // or "warning", "error"
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```
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**Sending messages:**
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```typescript
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pi.send("Message to inject into conversation");
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```
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