# Pi Packages

Self-contained extensions and tools bundled as npm packages, distributed via the `pi install` system. Each package contains extensions, skills, prompts, or themes.

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## Concept Files

* [pi-browser-use](pi-browser-use.md) — Browser automation extension wrapping chrome-devtools-mcp with `browser_` prefix, full config reference, session modes, and vision model setup.
* [pi-permission-system](pi-permission-system.md) — Permission enforcement and policy configuration system with 10 interconnected docs.

## Cross-References

- All packages are installed via `pi install npm:<name>` and loaded by pi's extension system.
- See [Npx Skills](../skills/npx-skills.md) for the pi-package distribution mechanism and package.json manifest format.