Extensions

These are all of the extensions for specifications we came across as part of this market research, tracking on how companies are extending the specifications to accomodate different experiences in their services and tooling, helping standardize how each standard is being used.

1: x-mcp

1 - x-mcp

Using an x-mcp OpenAPI extension to generate MCP from OpenAPI.

The x-mcp OpenAPI extension is a custom extension used to document and configure Model Context Protocol (MCP) servers within an OpenAPI specification. MCP is an open protocol enabling AI models to interact with external systems and APIs in a standardized way.

Mintlify - https://www.mintlify.com/docs/api-playground/openapi-setup#mcp

Redocly - https://redocly.com/docs/realm/content/api-docs/openapi-extensions/x-mcp

speakeasy - https://www.speakeasy.com/mcp/tool-design/optimizing-openapi

openapi-mcp-generator - https://github.com/harsha-iiiv/openapi-mcp-generator

Christian Posta - https://blog.christianposta.com/semantics-matter-exposing-openapi-as-mcp-tools/