context7-api_skill

Overview

This skill fetches up-to-date library documentation from the Context7 API to provide current, authoritative information about third-party packages. It is designed to be used proactively whenever working with external libraries so answers reflect the latest APIs, patterns, and best practices rather than outdated training data. The skill is implemented as a small CLI that searches libraries and retrieves contextual documentation snippets for specific queries.

How this skill works

You first search for a library to obtain its Context7 identifier, then request documentation context for a precise query using that identifier. The CLI returns searchable metadata and formatted context (plain text or markdown) and supports limiting output size via token limits. Use the search step to locate the exact repo or package, then the context step to fetch targeted docs, examples, or API details.

When to use it

• Before implementing features that depend on any external library (React, Next.js, Supabase, etc.).
• When a user asks about library APIs, signature changes, or recommended patterns.
• To debug behavior that might be version- or implementation-specific.
• When you need documentation published after your model training cutoff.
• To confirm best practices and migration paths for updated libraries.

Best practices

• Always run a search for the exact library name or repository to get the correct identifier before fetching context.
• Frame queries narrowly (specific function, hook, or pattern) to receive concise, relevant documentation snippets.
• Prefer fetched docs over in-model guesses for API signatures and behavior.
• Use token limits to keep responses focused when you only need a short excerpt.
• Choose the output format (txt or md) that best fits the consumer workflow or downstream display.

Example use cases

• Search and retrieve the current Next.js app router middleware docs when implementing route-level middleware.
• Fetch React hook cleanup semantics for useEffect to ensure correct lifecycle handling.
• Pull Supabase authentication and row-level security guidelines when integrating auth and database rules.
• Confirm breaking changes or new parameters for a library before upgrading dependencies.
• Provide precise code examples from upstream docs when answering developer questions in chat or code reviews.