An MCP server that fetches live, version-specific documentation for thousands of popular libraries and injects it into the Claude Code context before code generation — eliminating stale-API hallucinations caused by training data cutoffs.
Key facts
- Type: MCP server / documentation injection tool
- Status: Active
- Coverage: Thousands of libraries including Next.js, React, MongoDB, and other popular targets
- Setup: Single install command; invoked by prompting Claude to “use Context7”
- Output: Live documentation prose + working code examples for the specific library version in the project
What problem it solves
Claude’s training data has a cutoff. When writing code against popular libraries, it sometimes suggests renamed or deprecated API functions that worked in older versions but fail in current releases. Context7 intercepts this by pulling the current library documentation into context before the first line of code is written. [011]
Related
- See also: Claude Code
- Concepts: Context Engineering, Mcp Vs Cli Token Tradeoff
Source references
- [011] Nate Herk — Claude Code power features cluster (2026-04-20 to 2026-04-27)
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