singularity-forge/docs/dev/extending-pi/05-extension-structure-styles.md

Extension Structure & Styles

Single File (simplest)

~/.sf/agent/extensions/
└── my-extension.ts

Directory with index.ts (multi-file)

~/.sf/agent/extensions/
└── my-extension/
    ├── index.ts        # Entry point (must export default function)
    ├── tools.ts
    └── utils.ts

Package with Dependencies (npm packages needed)

~/.sf/agent/extensions/
└── my-extension/
    ├── package.json
    ├── package-lock.json
    ├── node_modules/
    └── src/
        └── index.ts

// package.json
{
  "name": "my-extension",
  "dependencies": { "zod": "^3.0.0" },
  "pi": { "extensions": ["./src/index.ts"] }
}

Run npm install in the extension directory. Imports from node_modules/ resolve automatically.

Available Imports

Package	Purpose
@mariozechner/pi-coding-agent	Extension types (ExtensionAPI, ExtensionContext, event types, utilities)
@sinclair/typebox	Schema definitions for tool parameters (Type.Object, Type.String, etc.)
@mariozechner/pi-ai	AI utilities (StringEnum for Google-compatible enums)
@mariozechner/pi-tui	TUI components (Text, Box, Container, SelectList, etc.)
Node.js built-ins	node:fs, node:path, node:child_process, etc.

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