[BUG] GitLab MCP plugin fails to reconnect - "Failed to reconnect to plugin:gitlab:gitlab"

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@shell362, did you find a working solution? I run into the same problem and don't know whether its an access level issue.

<img width="749" height="176" alt="Image" src="https://github.com/user-attachments/assets/c06b1afe-b454-44d9-b545-ead7af704429" />

Either way, there is no error message, which makes it quite hard to debug.

Nope, I didn't.

I'm also facing the same issue

Same issue here. I have a colleague on the same Gitlab team with no issues.

Same issue here. The same GitLab instance works fine for Codex MCP but not for GitLab. It worked fine previously, but today it suddenly stopped. I downgraded Claude Code to earlier versions, but they didn’t work either.

Update: It recovered automatically about 6 hours after I posted this comment, and I changed nothing.

Update: The problem occurred again about 12 hours after the last edit. I changed nothing, and Codex MCP continues to work fine.

Update: I can confirm I only have this problem in Zed’s terminal. I cannot re-authenticate in Zed, but when I use another terminal, authentication works, and after authenticating elsewhere, Zed’s terminal works again.

i see these logs when running claude with --debug but no clue what URL it's trying to hit that 404s

2026-03-02T07:33:43.488Z [DEBUG] MCP server "plugin:gitlab:gitlab": HTTP Connection failed after 328ms: Streamable HTTP error: Error POSTing to endpoint: {"message":"404 Not Found"} (code: 404, errno: none)
2026-03-02T07:33:43.488Z [ERROR] MCP server "plugin:gitlab:gitlab" Error: Streamable HTTP error: Error POSTing to endpoint: {"message":"404 Not Found"}
2026-03-02T07:33:43.488Z [DEBUG] MCP server "plugin:gitlab:gitlab": Connection failed after 328ms: Streamable HTTP error: Error POSTing to endpoint: {"message":"404 Not Found"}
2026-03-02T07:33:43.488Z [ERROR] MCP server "plugin:gitlab:gitlab" Connection failed: Streamable HTTP error: Error POSTing to endpoint: {"message":"404 Not Found"}

also i just started a trial of gitlab ultimate and still getting the error, so thats no help

I cleared Authentication and tried to authenticate again and got (with --debug)

╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ Gitlab MCP Server                                                                                                                                               │
│                                                                                                                                                                 │
│ Status: ✘ failed                                                                                                                                                │
│ Auth: ✘ not authenticated                                                                                                                                       │
│ URL: https://gitlab.com/api/v4/mcp                                                                                                                              │
│ Config location: /home/myuser/myproject/.mcp.json                                                                                      │
│                                                                                                                                                                 │
│ Error: HTTP 429: Invalid OAuth error response: SyntaxError: Unexpected token 'T', "This endpo"... is not valid JSON. Raw body: This endpoint has been requested │
│  too many times. Try again later.                                                                                                                               │
│                                                                                                                                                                 │
│ ❯ 1. Authenticate                                                                                                                                               │
│   2. Reconnect                                                                                                                                                  │
│   3. Disable                                                                                                                                                    │
╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

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Edit: I wasn't aware this MCP is only supported by GitLab Premium or Ultimate

Wow le suck that this is Feature Gated. Neggie Aura for Gitlab.

@shapeshed cloude-code is great at using the glab cli tool. Just give it a token.

@zoechi yep doing that, just prefer OAuth over PATs