---

name: opensrc description: Fetch npm package source code for implementation analysis. Use when types/docs aren't enough and you need to understand HOW a library works internally. allowed-tools:

• Bash
• Read
• Glob
• Grep

---

opensrc

Fetch npm package source code locally when you need to understand implementation details.

When to Use

• Debugging unexpected library behavior
• Understanding internal patterns before extending a library
• Types/docs are insufficient

Commands

# Fetch package(s)
npx opensrc <package>
npx opensrc ai zod @anthropic-ai/sdk

# Check what's fetched
cat opensrc/sources.json

# Clean up when done
rm -rf opensrc/<package>

Exploration Pattern

# 1. Fetch
npx opensrc ai

# 2. Check structure (many are monorepos)
ls opensrc/ai/packages/

# 3. Find what you need
grep -r "functionName" opensrc/ai/src/

# 4. Read the implementation
# (use Read tool)

# 5. Clean up
rm -rf opensrc/ai

Tips

• Check sources.json first - don't re-fetch what's already there
• Target specific files - don't read entire packages
• Monorepos: Check packages/ directory for subpackages
• Clean up - source code takes disk space, remove when done

Common Packages

Package	Structure
ai	Monorepo: packages/anthropic/, packages/openai/, etc.
@anthropic-ai/sdk	Single package: src/
zod	Single package: src/types/