doc

/doc — Local Documentation Caching

Cache any external documentation locally for your project:

• Libraries (npm packages, Python packages)
• Frameworks (Next.js, Convex, FastAPI)
• Services (Tailscale, OCI, Docker)
• CLIs and tools
• Anything with online docs

Why Cache Docs Locally?

1. Validate against actual docs — not stale training data
2. Avoid repeated web fetches during development
3. Version docs with your project — docs travel with code
4. Reference with @filename — simple markdown inclusion

No MCP required — just fetch once, save to markdown, reference with @.

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Usage

# Cache documentation
/doc convex https://docs.convex.dev
/doc nextjs https://nextjs.org/docs
/doc tailscale https://tailscale.com/kb/api
/doc poetry https://python-poetry.org/docs

# List cached docs
/doc --list

# Show path to docs
/doc --show convex

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Directory Structure

Docs are saved to $PROJECT/docs/external/:

$PROJECT/docs/external/
├── convex/
│   └── README.md           # Full documentation
├── nextjs/
│   └── README.md
├── tailscale/
│   └── README.md
├── poetry/
│   └── README.md
└── .index.md               # List of all cached docs with source URLs

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How It Works

1. Uses Jina.ai reader (https://r.jina.ai/<url>) to fetch docs as markdown
2. Saves to $PROJECT/docs/external/<name>/README.md
3. Updates $PROJECT/docs/external/.index.md with all cached docs
4. Reference later with @docs/external/<name>/README.md

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Session Start: Check Local Docs First

Before using WebSearch for docs:

# Check what's cached locally
ls docs/external/

# Read the index
cat docs/external/.index.md

# Reference a doc
@docs/external/convex/README.md

If no local docs exist:

1. Suggest running /doc <name> <url> to cache them
2. Auto-detect: When you see external imports/dependencies, prompt to cache docs

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Examples

Cache Convex Docs

/doc convex https://docs.convex.dev

Cache Next.js Docs

/doc nextjs https://nextjs.org/docs

Cache Poetry Docs

/doc poetry https://python-poetry.org/docs

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Integration with docs-first.md

The docs-first.md rule now checks $PROJECT/docs/external/ before using WebSearch:

1. Check local docs first — ls docs/external/
2. Use WebSearch only if — no local docs exist
3. Suggest caching — /doc <name> <url> if docs would be useful

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Verification

After caching docs:

# Verify file was created
ls -la docs/external/convex/

# Check index was updated
cat docs/external/.index.md

# Reference in conversation
@docs/external/convex/README.md

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Keywords

documentation, docs, cache, fetch, download, reference, external, api docs, library docs