---
type: Glossary Term
title: "Dynamic Client Registration & Client ID Metadata"
description: "Dynamic Client Registration (DCR, RFC 7591) and OAuth Client ID Metadata Documents allow an AI agent or MCP host to authenticate with a newly discovered authorization server without a human developer manually pre-registering a client_id on that site first."
resource: "https://agenticweb.wiki/terms/dynamic-client-registration/"
tags: ["glossary", "permit"]
status: stable
generated: { by: agenticweb-builder/1.0, at: 2026-10-23T00:00:00Z }
verified: { by: process:agenticweb-engine, at: 2026-10-23T00:00:00Z }
stale_after: 2026-11-22T00:00:00Z
sources:
  - id: ref-1
    resource: "https://modelcontextprotocol.io/specification/2026-07-28/basic/authorization/client-registration"
    last_modified: 2026-07-28T00:00:00Z
  - id: ref-2
    resource: "https://www.rfc-editor.org/rfc/rfc9728"
    last_modified: 2026-09-05T00:00:00Z
---

# Dynamic Client Registration & Client ID Metadata

**Dynamic Client Registration (DCR, RFC 7591)** and **OAuth Client ID Metadata Documents** allow an AI agent or MCP host to authenticate with a newly discovered authorization server without a human developer manually pre-registering a `client_id` on that site first. In the **MCP Authorization** specification (`2026-07-28`), an agent host can present an HTTPS URL as its `client_id` pointing to a JSON metadata document it controls (Client ID Metadata Document) or register dynamically via RFC 7591 after discovering endpoints through **RFC 9728 Protected Resource Metadata**. Used by: mcp, oauth-metadata-for-agents.

# Knowledge Graph

* **Related standards**: [Model Context Protocol](/okf/protocols/mcp.md), [OAuth Protected Resource and Authorization Server Metadata (as used for agent authorization)](/okf/protocols/oauth-metadata-for-agents.md)

[^ref-1]: https://modelcontextprotocol.io/specification/2026-07-28/basic/authorization/client-registration (https://modelcontextprotocol.io/specification/2026-07-28/basic/authorization/client-registration)
[^ref-2]: https://www.rfc-editor.org/rfc/rfc9728 (https://www.rfc-editor.org/rfc/rfc9728)