# mcp and hook

> Stdio helpers Cursor launches. Do not run these by hand unless debugging.

Cursor starts these. They print JSON only. No Clack UI.

```bash
stacktaste mcp
stacktaste hook sessionStart
```

`mcp` uses the CLI host (API when a token exists). See [MCP overview](/mcp/overview).

`hook <event>` reads JSON on stdin. Events: `sessionStart`, `beforeSubmitPrompt`, `afterFileEdit`, `stop`, `preToolUse`.