# Context7 > Look up external library documentation using Context7 to get current API references instead of guessing from training data. Use when this capability is needed. - Skill: `tomevault-io/context7` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/context7` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/context7/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Docs & Writing - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/context7 --- # Context7: External Library Documentation Use Context7 to look up current library APIs instead of guessing from training data. ## When to Use 1. **Implementing with external libraries** - Check current API before writing code 2. **Debugging library errors** - Verify correct usage patterns 3. **User asks "how do I use X"** - Get up-to-date examples 4. **Uncertain about library API** - Don't guess, look it up 5. **Library version matters** - Context7 has version-specific docs ## Workflow ``` resolve-library-id(libraryName="tokio", query="async runtime spawn tasks") query-docs(libraryId="/tokio-rs/tokio", query="how to spawn async tasks") ``` Always call `resolve-library-id` first to get the correct library ID, then `query-docs` with a specific question. ## When NOT to Use - Standard library features (Rust std, Python builtins, etc.) - Confident in the API from recent experience - Simple operations with well-known patterns ## Example User asks about async file reading with tokio: 1. `resolve-library-id(libraryName="tokio", query="async file reading")` 2. `query-docs(libraryId="/tokio-rs/tokio", query="async file reading tokio::fs")` 3. Use the returned docs to write correct code --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/conarylabs) — claim your Tome and manage your conversions.