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The MCP Registry is currently in preview. Breaking changes or data resets may occur before general availability. If you encounter any issues, please report them on GitHub.

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General

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What is the difference between “Official MCP Registry”, “MCP Registry”, “MCP registry”, “MCP Registry API”, etc?

  • “MCP Registry API” — An API that implements the OpenAPI spec defined by the MCP Registry.
  • “Official MCP Registry API” — The REST API served at https://registry.modelcontextprotocol.io, which is a superset of the MCP Registry API. Its OpenAPI spec can be downloaded from https://registry.modelcontextprotocol.io/openapi.yaml.
  • “MCP registry” — A third-party service that provides an MCP Registry API.
  • “Official MCP Registry” (or “The MCP Registry”) — The service that lives at https://registry.modelcontextprotocol.io.

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Can I delete/unpublish my server?

Currently, no. At the time of writing, there is open discussion.

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How do I update my server metadata?

Submit a new server.json with a unique version string. Once published, version metadata is immutable (similar to npm).

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Can I add custom metadata when publishing?

Yes, custom metadata under _meta.io.modelcontextprotocol.registry/publisher-provided is preserved when publishing to the registry. This allows you to include custom metadata specific to your publishing process.
There is a 4KB size limit (4096 bytes of JSON). Publishing will fail if this limit is exceeded.

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Reporting Issues

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What if I need to report a spam or malicious server?

  1. Report it as abuse to the underlying package registry (e.g. NPM, PyPi, DockerHub, etc.); and
  2. Raise a GitHub issue on the registry repo with a title beginning Abuse report:

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What if I need to report a security vulnerability in the registry itself?

Follow the MCP community SECURITY.md.