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Compare MCP servers

Compare scores, permissions, risks, and fit in one decision-focused table.

DimensionMCP InspectorVisual testing tool for MCP serversNPM Sentinel MCP ServerAI-powered NPM package analysis MCP server
FMRS73 / 100 · B79 / 100 · B
Reliability10 / 2012 / 20
Security and permissions15 / 2016 / 20
Maintenance17 / 2018 / 20
Documentation18 / 2018 / 20
Setup experience13 / 2015 / 20
Best for
  • Engineers building or maintaining an MCP server who need to verify protocol behavior
  • Teams that want automated regression checks of an MCP server in CI
  • Advanced users debugging low-level request/response details, such as custom headers or error codes
  • 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 who just want to chat with an AI assistant and don't care about the underlying protocol
  • Teams wanting a hosted, zero-setup inspection service (it must be run locally or self-hosted)
  • Anyone looking for an MCP server that provides business-facing tools to an AI client — Inspector is itself a client/testing tool, not a callable tool server
  • 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 Node.js and may spawn a target MCP server as a subprocess when using stdio transport
  • Makes outbound network connections to reach MCP servers over streamable-HTTP
  • In Web mode, binds a local port (default 6274) and runs a backend capable of spawning processes
  • Reads and writes local configuration files (e.g. `--config`/`--catalog` JSON)
  • 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 Web backend can spawn processes; setting `DANGEROUSLY_BIND_ALL_INTERFACES=true` exposes it to the local network, so pair it with an auth token
  • Setting `DANGEROUSLY_OMIT_AUTH=true` disables authentication and should only be used in fully trusted environments
  • When pointed at an untrusted or malicious MCP server, its responses are proxied and displayed as-is, so the trustworthiness of the server under inspection matters
  • 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