Exempt /auth/oauth/ from platform CSRF (MCP connector DCR/token) - #14
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Claude.ai's dynamic client registration and token exchange are cookieless machine-to-machine POSTs that can't carry the platform's double-submit CSRF token — they were 403'ing. /auth/oauth/register + /token are protected by PKCE + client validation, and the consent POST carries its own signed token, so the whole /auth/oauth/ prefix is safe to exempt (gated on oauth_server.enabled). Claude-Session: https://claude.ai/code/session_0154TnwYASjN1u1Hw97JQ2vd
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Claude.ai's DCR + token POSTs are cookieless and were 403'ing on the platform CSRF check. Exempt the /auth/oauth/ prefix (register/token are PKCE+client-protected; consent POST carries its own signed token). Gated on oauth_server.enabled. Verified against the live trufflepig_mcp connector.