Dynamic Client Registration (DCR)

Dynamic Client Registration (DCR): RFC 7591 registration where a client POSTs to /register for credentials; deprecated in MCP 2026-07-28 and kept for compatibility. Example: Supabase's hosted server uses DCR so users sign in through the browser. Also in the glossary is document.modelContext: The WebMCP entry point on the document object that holds registerTool, getTools and executeTool.

Definition

RFC 7591 registration where a client POSTs to /register for credentials; deprecated in MCP 2026-07-28 and kept for compatibility.

Example, with source

Supabase's hosted server uses DCR so users sign in through the browser. (supabase.com, read 4 November 2026)

Where it appears on this site

• MCP
• OAuth for MCP

Neighbouring terms

• document.modelContext: The WebMCP entry point on the document object that holds registerTool, getTools and executeTool.
• Elicitation: A way for a server to ask the user, through the client, for more information, now handled through multi round-trip requests.
• HTTP+SSE transport: The older MCP HTTP transport with a separate SSE endpoint, deprecated since 2025-03-26 and reclassified Deprecated in 2026-07-28.