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DimensionFastify MCP ServerFastify plugin for building MCP servers with SSE, stdio, OAuth 2.1, and Redis-backed scaling.NPM Sentinel MCP ServerAI-powered NPM package analysis MCP server
FMRS63 / 100 · C79 / 100 · B
Reliability9 / 2012 / 20
Security and permissions14 / 2016 / 20
Maintenance10 / 2018 / 20
Documentation17 / 2018 / 20
Setup experience13 / 2015 / 20
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 auditing NPM dependencies within AI workflows
  • Teams performing supply chain security assessments
  • Users of Claude Desktop, Cursor, or VS Code
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
  • 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
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
  • 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
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
  • 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
Supported clientsClaude Desktop, VS Code, Cursor
Tools019