| FMRS | 63 / 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 | 14 / 20 | 16 / 20 | 16 / 20 |
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| Maintenance | 10 / 20 | 17 / 20 | 18 / 20 |
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| Documentation | 17 / 20 | 15 / 20 | 18 / 20 |
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| Setup experience | 13 / 20 | 18 / 20 | 15 / 20 |
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| Best for | - Node.js/Fastify developers who need to build a scalable, authenticated MCP server from scratch
- Teams deploying multiple server instances behind a load balancer with Redis for shared state
- Projects that want TypeBox-based compile-time and runtime type safety for tool inputs
| - 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 | - End users looking for a ready-made server that already exposes a fixed set of tools (e.g. filesystem or database access)
- Teams not using Node.js/Fastify
- Simple single-instance prototypes that don't need scaling, OAuth, or session persistence
| - 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 | - Runs as a library inside the developer's own Fastify process — actual filesystem/network access depends entirely on the tool handlers the developer implements
- Requires network access to a Redis instance when horizontal scaling is enabled (session store and message broker)
- Requires network access to the configured JWKS or token-introspection endpoint when OAuth 2.1 authorization is enabled
- URL-mode elicitation sends the end user out of band to an external URL to complete sensitive interactions
| - 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 | - The plugin ships with no built-in tools, so its real-world security depends on the handlers developers write on top of it
- Without authorization enabled, tasks are protected only by their random UUID — anyone holding a task ID can reach it, since no requestor identity exists to bind it to
- Production-grade rate limiting must be added by the integrator; the plugin only provides basic DoS protections (length, depth, and property-count limits)
- Multiple SSE connections are intentionally allowed per session and receive broadcast messages, a deliberate deviation from the MCP spec's single-stream delivery rule that can cause duplicate message delivery
- `transformRouteSchema` only edits OpenAPI documentation metadata — it does not enforce authentication, so real auth hooks must be configured separately
| - 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 Code, VS Code, Cursor, Cline, Amp | Claude Desktop, VS Code, Cursor |
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| Tools | 0 | 2 | 19 |
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