claude-code - 💡(How to fix) Fix [BUG] Official Greptile Plugin won't Authenticate: Error: SDK auth failed: Incompatible auth server: does not support dynamic client registration [1 comments, 2 participants]

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anthropics/claude-code#45518Fetched 2026-04-09 08:03:33
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Error Message

Error: SDK auth failed: Incompatible auth server: does not support dynamic client registration

Code Example

Error: SDK auth failed: Incompatible auth server: does not support dynamic client registration

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Error: SDK auth failed: Incompatible auth server: does not support dynamic client registration
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

When I run /mcp in Claude Code I get this:

<img width="1428" height="742" alt="Image" src="https://github.com/user-attachments/assets/2313cb38-e7dc-4f8f-b0fc-e033837312b7" />

When I select the greptile entry, and then select "Authenticate", I get this:

<img width="1428" height="903" alt="Image" src="https://github.com/user-attachments/assets/2d8f44b0-9d62-4a04-827c-44546c30feb0" />

Error:

Error: SDK auth failed: Incompatible auth server: does not support dynamic client registration

What Should Happen?

Claude should authenticate the Greptile MCP.

Error Messages/Logs

Error: SDK auth failed: Incompatible auth server: does not support dynamic client registration

Steps to Reproduce

  1. Install Claude Code
  2. Run claude
  3. Type /mcp and press enter
  4. Navigate down to greptile and press enter
  5. Select "Authenticate" and observe error

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

2.1.97 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

No response

extent analysis

TL;DR

The error "Incompatible auth server: does not support dynamic client registration" suggests that the authentication issue is due to the auth server not supporting dynamic client registration, and a potential fix could involve updating the auth server configuration or using a different authentication method.

Guidance

  • The error message indicates that the auth server used by Claude Code does not support dynamic client registration, which is required for the Greptile MCP authentication.
  • To verify this, check the auth server configuration to see if dynamic client registration is enabled.
  • Consider updating the auth server to a version that supports dynamic client registration or using a different authentication method that does not require dynamic client registration.
  • If possible, try using a different auth server or authentication method to see if the issue is specific to the current setup.

Example

No code snippet is provided as the issue seems to be related to the auth server configuration rather than the Claude Code itself.

Notes

The issue may be specific to the Anthropic API and Windows platform, and more information about the auth server configuration and version may be needed to provide a definitive fix.

Recommendation

Apply workaround: The best course of action would be to apply a workaround, such as using a different authentication method or updating the auth server configuration, as the issue seems to be related to the auth server rather than the Claude Code itself.

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claude-code - 💡(How to fix) Fix [BUG] Official Greptile Plugin won't Authenticate: Error: SDK auth failed: Incompatible auth server: does not support dynamic client registration [1 comments, 2 participants]