Context7

What it does

Models often know an old version of a library, or invent APIs that do not exist. Context7 fetches current documentation and code examples for the library and version you use, and places them in the prompt.

Why it is useful

• Fewer made-up functions and outdated patterns.
• Works with the major coding agents through MCP.

How to use it

npx ctx7 setup

Then ask your agent to use Context7 when you work with a library.

Watch out for

• It adds documentation to your context, which costs tokens. Ask for the topic you need, not the whole library.