Lumen MCP does not connect
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- Dominant language
- Go
- Stars
- 297
- Forks
- 35
- PR merge metrics
- No merged PRs in 30d
Description
Hello, after installing in Claude CLI via suggested commands from readme, Claude sessions fail to connect to lumen MCP. --debug log output is the following:
2026-04-24T13:23:04.349Z [ERROR] MCP server "plugin:lumen:lumen" Server stderr: Downloading lumen v0.0.37 for cygwin_nt-10.0-26200/amd64...
curl: (22) The requested URL returned error: 404
Version v0.0.37 not found, resolving latest release...
Falling back to v0.0.37...
curl: (22) The requested URL returned error: 404
2026-04-24T13:23:04.350Z [DEBUG] MCP server "plugin:lumen:lumen": Connection failed after 1039ms: MCP error -32000: Connection closed
2026-04-24T13:23:04.350Z [ERROR] MCP server "plugin:lumen:lumen" Connection failed: MCP error -32000: Connection closed
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the installation from the README's suggested Claude CLI commands on the reported Cygwin environment, then inspect the debug output showing the v0.0.37 download returning 404. Done means the Lumen MCP server downloads successfully and Claude sessions establish a connection.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- go
- Domain
- api
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100