Solving Redirect URI Limitations in Model Context Protocol OAuth
November 4, 2026
MCP servers currently restrict OAuth redirect URIs to a hardcoded allowlist of major clients like Claude and Cursor. This prevents users from connecting custom agents or self-hosted MCP clients to private data sources due to invalid_redirect_uri errors.
HOW THIS AFFECTS YOU
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builderYou cannot currently use custom-built MCP clients with existing MCP servers without an operator updating their allowlist.