Where does the bug appear (feature/product)? Cursor IDE Describe the Bug I successfully setup a github MCP server to provide access to the github ‘projects’ tools (30 days ago) and it was working correctly. I returned to working on this project a few days ago and find I now get an error in cursor settings: 2026-04-10 09:01:40.742 [info] [V2] Handling CreateClient action 2026-04-10 09:01:40.742 [info] [V2 FSM] connection:connect_start: conn=idle,auth=unknown -> conn=connecting,auth=unknown 2026-04-10 09:01:42.203 [info] No stored client information found 2026-04-10 09:01:42.206 [info] Using redirect URL 2026-04-10 09:01:42.207 [warning] Transient error connecting to streamableHttp server: Incompatible auth server: does not support dynamic client registration 2026-04-10 09:01:42.207 [warning] Connection failed: Incompatible auth server: does not support dynamic client registration 2026-04-10 09:01:42.207 [warning] [V2 FSM] connection:connect_failure: conn=connecting,auth=unknown -> conn=failed,auth=unknown 2026-04-10 09:01:42.207 [info] CreateClient completed, connected: false, statusType: error Steps to Reproduce Create an MCP entry with a github personal access token as follows: "github-projects": { "type": "http", "url": "https://api.githubcopilot.com/mcp/x/projects", "headers": { "Authorization": "Bearer ghp_my_key” } }, Expected Behavior Cursoe should authenticate with the github MCP server should provide the github projects tools. Operating System MacOS Version Information Version: 3.0.13 VSCode Version: 1.105.1 Commit: 48a15759f53cd5fc9b5c20936ad7d79847d914b0 Date: 2026-04-07T03:05:17.114Z Layout: editor Build Type: Stable Release Track: Default Electron: 39.8.1 Chromium: 142.0.7444.265 Node.js: 22.22.1 V8: 14.2.231.22-electron.0 OS: Darwin x64 24.6.0 For AI issues: which model did you use? N/A Additional Information I think this may be a similar issue: [image] Slack MCP plugin fails to connect — "does not support dynamic client registration" Bug Reports Where does the bug appear (feature/product)? Cursor IDE Describe the Bug The official Slack MCP plugin (https://mcp.slack.com/mcp) fails to authenticate. Cursor’s OAuth client attempts Dynamic Client Registration (DCR), but Slack’s auth server doesn’t support DCR, causing a fatal error on both streamableHttp and SSE transports. No “Connect” button or browser OAuth prompt ever appears. Steps to Reproduce Install the Slack MCP plugin from the Cursor marketplace Go to Settings > MCP — the slack … Does this stop you from using Cursor No - Cursor works, but with this issue

Hey, thanks for the report. This is a known bug. Cursor starts OAuth discovery before it sends the POST with your Authorization header. If the server (in this case api.githubcopilot.com) responds to the OAuth discovery endpoints, Cursor tries Dynamic Client Registration, but GitHub doesn’t support it. That’s why you see the error. More details on the root cause and discussion here: MCP headers config ignored when server has OAuth discovery Unfortunately there’s no client-side workaround. The issue is that the logic “if Authorization is already in headers, skip OAuth” is missing. The team is aware, but there’s no ETA yet. Your report helps with prioritization. Let me know if anything changes.

Regression: github projects endpoint no longer accessible

Support Bug Reports

Topic		Replies	Views
MCP headers config ignored when server has OAuth discovery Bug Reports mcp	9	742	May 22, 2026
GitHub MCP connects, then fails with "Client error: terminated" (Windows) Bug Reports mcp , github , plugins	3	79	November 7, 2026
Cursor MCP connector cannot load a remote MCP server (fails with and without OAuth) Bug Reports mcp , login , cloud-agents	1	236	August 12, 2026
Github MCP being loaded infinitely Bug Reports	3	343	December 19, 2025
Not all MCP tools working in Cursor CLI (authentication problem) Bug Reports cli	5	920	October 25, 2025

Regression: github projects endpoint no longer accessible

Related topics