# Context7 Lookup Skill

Fetches up-to-date, version-specific library documentation via Context7 MCP server (68,000+ libraries). **Fully language-agnostic** - works with Node.js, Python, Java, Rust, Go, Ruby, PHP, C#, Swift, and more.

## Purpose

Prevent hallucinated APIs and outdated code examples by fetching current documentation from official sources.

## Auto-detects Versions From

Node.js • Python • Java • Rust • Ruby • Go • PHP • C#/.NET • Swift

(package.json, requirements.txt, Cargo.toml, pom.xml, Gemfile, go.mod, composer.json, *.csproj, Podfile)

## Integration

- **Planner**: Research phase (Step 4) for library investigation
- **Developer**: Pre-implementation (Step 2.5) to verify APIs
- **Reviewer**: Optional verification during code review

## How It Works

1. **Detect Version**: `grep_search` dependency files
2. **Resolve Library**: `mcp_context7_resolve-library-id`
3. **Fetch Docs**: `mcp_context7_query-docs`
4. **Apply**: Use verified API patterns

## Examples

**Python**: Django ORM • Flask routes • SQLAlchemy
**Rust**: Tokio async • Serde serialization
**Java**: Spring Boot • Hibernate
**JS/TS**: Next.js • React • Express
**Go**: Gin router • GORM

## Benefits

✅ Current, version-specific docs
✅ No hallucinated APIs
✅ Official examples
✅ Prevents "method not found" errors

See [SKILL.md](SKILL.md) for complete documentation.