--- title: "Client ID Metadata Document (CIMD): definition | Agent MCP Directory" description: "Client ID Metadata Document (CIMD): A JSON file on the client's domain whose HTTPS URL is used as the OAuth client_id. Defined with a sourced example." canonical: https://agentmcpdirectory.com/glossary/client-id-metadata-document site: "Agent MCP Directory" last_updated: 2026-11-04 section: "Glossary" --- # Client ID Metadata Document (CIMD): definition | Agent MCP Directory > Client ID Metadata Document (CIMD): A JSON file on the client's domain whose HTTPS URL is used as the OAuth client_id. Defined with a sourced example. Source: https://agentmcpdirectory.com/glossary/client-id-metadata-document Site: Agent MCP Directory Last reviewed: 2026-11-04 # Client ID Metadata Document (CIMD) Client ID Metadata Document (CIMD): A JSON file on the client's domain whose HTTPS URL is used as the OAuth client\_id, the recommended MCP registration method. Example: Vercel MCP accepts CIMD clients without review since 2 Nov 2026. Also in the glossary is agents.json: An OpenAPI-based file at /.well-known/agents.json describing flows of API calls for agents. ## Definition A JSON file on the client's domain whose HTTPS URL is used as the OAuth client\_id, the recommended MCP registration method. ## Example, with source Vercel MCP accepts CIMD clients without review since 2 Nov 2026. ([vercel.com](https://vercel.com/changelog/vercel-mcp-now-supports-client-id-metadata-documents), read 4 November 2026) ## Where it appears on this site - [MCP](https://agentmcpdirectory.com/standards/mcp/) - [OAuth for MCP](https://agentmcpdirectory.com/guides/oauth-for-mcp-cimd-dcr/) ## Neighbouring terms - [AI gateway](https://agentmcpdirectory.com/glossary/ai-gateway/): A proxy in front of model APIs that adds caching, rate limits, logs and billing across providers. - [Code Mode](https://agentmcpdirectory.com/glossary/code-mode/): A Cloudflare approach where the agent writes code against a typed API instead of calling many tools one by one, set by portal policy. - [Confused deputy](https://agentmcpdirectory.com/glossary/confused-deputy/): An attack where a proxy with its own credentials is tricked into acting for someone else; MCP security guidance addresses it for OAuth proxies. Edition 4 November 2026 Method [How rows are verified](https://agentmcpdirectory.com/method/) Data [CSV and JSON](https://agentmcpdirectory.com/data/) Markdown [This page as markdown](https://agentmcpdirectory.com/glossary/client-id-metadata-document/index.md) ## Sources - [Source for the Client ID Metadata Document (CIMD) example](https://vercel.com/changelog/vercel-mcp-now-supports-client-id-metadata-documents), read 4 November 2026 Last reviewed 4 November 2026