| FMRS | 57 / 100 · C | 80 / 100 · B | 79 / 100 · B |
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| Reliability | 9 / 20 | 14 / 20 | 12 / 20 |
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| Security and permissions | 11 / 20 | 16 / 20 | 16 / 20 |
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| Maintenance | 12 / 20 | 17 / 20 | 18 / 20 |
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| Documentation | 13 / 20 | 15 / 20 | 18 / 20 |
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| Setup experience | 12 / 20 | 18 / 20 | 15 / 20 |
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| Best for | - Developers working in JavaScript/TypeScript with Fetch-compatible frameworks
- Teams wanting one handler that serves both new and legacy MCP clients
- Stateless, per-request deployments that do not need Redis sessions
- Projects needing RFC 9728 / RFC 8414 compliant authorization surfaces
| - Developers using fast-moving frameworks/libraries worried about the AI suggesting stale code
- Scenarios wanting zero-config documentation lookup
| - Developers auditing NPM dependencies within AI workflows
- Teams performing supply chain security assessments
- Users of Claude Desktop, Cursor, or VS Code
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| Not for | - Frameworks built on Node.js IncomingMessage/ServerResponse such as Express without a Web Request adapter
- Projects still on @modelcontextprotocol/sdk 1.x (use mcp-handler 1.x instead)
- Deployments requiring the HTTP+SSE (2024-11-05) transport, removed in 2.x
- Environments running Node.js below 20
| - Looking up internal/private codebase documentation (Context7 targets publicly published open-source libraries)
- Cases needing very high coverage of obscure, niche libraries (coverage depends on what Context7's platform has indexed)
| - Projects outside the NPM ecosystem (e.g., pure Python/Go)
- Environments without network access to deps.dev, OSV.dev, and the npm registry
- Scenarios requiring maintenance by an official upstream vendor
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| Required permissions | - Access to the exposed HTTP route
- Access to the authorization server that issues bearer tokens
- Ability to configure protected resource metadata endpoints
- Network access from the deployment to the authorization server when verifying tokens
| - Usable without an API key (subject to a free-tier rate limit); CONTEXT7_API_KEY is an optional credential for higher quota
- Read-only documentation lookup — no code execution or local filesystem access involved
| - Network access to the NPM registry and external services (deps.dev, OSV.dev, OpenSSF, npms.io, GitHub)
- Read access to workspace lockfiles (pnpm-lock.yaml, package-lock., yarn.lock) for cache invalidation
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| Risks and side effects | - Exposing the MCP handler publicly without auth can let arbitrary callers invoke registered tools
- Tool return content flows into the model context, so sensitive data could leak
- 2.x is stateless, so GET/DELETE session operations return 405 and session-dependent clients may misbehave
- Migrating from 1.x is a breaking change (full Standard Schema for inputSchema, removal of variadic methods, ctx.http?.authInfo), and improper upgrades cause runtime errors
| - The free tier has limited quota — high-frequency use may hit rate limits
- Documentation content comes from Context7's platform index, so its accuracy and freshness depend on that platform's crawl cadence
| - Third-party READMEs and changelogs are untrusted external content; they are wrapped in tags with _meta flags but should still be handled cautiously
- Depends on availability and accuracy of external services
- Batch requests are capped at 25 packages to prevent registry enumeration; larger sets require batching
- Third-party open source project, not officially maintained by NPM or Anthropic
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| Supported clients | Claude Desktop, Cursor, Windsurf | Claude Code, VS Code, Cursor, Cline, Amp | Claude Desktop, VS Code, Cursor, Smithery.ai |
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| Tools | 1 | 2 | 19 |
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