[BUG] MCP Fails to connect

[sameehj]

Environment

• Platform:
  • [ ] Other: Claude CLI
• Claude CLI version: 1.0.17 (Claude Code)
• Operating System: 14.3.1 (23D60)
• Terminal: Cursor Terminal

Bug Description

I try to add the mcp server [0] which is mainly running [1] for mcp

claude mcp add -t sse ebpf http://localhost:8080/mcp

Steps to Reproduce

1. clone ebpf-mcp & run make
2. run ebpf-mcp-server (can be ran locally / on vm)
3. attach to claude mcp using the command above
4. run claude --debug

[0] https://github.com/sameehj/ebpf-mcp [1] https://github.com/mark3labs/mcp-go

Expected Behavior

MCP connected successfully

Actual Behavior

 ※ Tip: Send messages to Claude while it works to steer Claude in real-time
[DEBUG] MCP server "ebpf": SSE Connection error: {"url":"http://localhost:8080/mcp","error":"SSE error: Non-200 status code (202)","stack":"Error: SSE error: Non-200 status code (202)\n    at _eventSource.onerror (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1364:13931)\n    at wm.ro (file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1364:4946)\n    at file:///usr/local/lib/node_modules/@anthropic-ai/claude-code/cli.js:1364:1799\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)"}
[ERROR] MCP server "ebpf" Error: SSE error: Non-200 status code (202)

Additional Context

[ashwin-ant]

@sameehj does this server work with other MCP clients (like the MCP inspector)?

[sameehj]

It seems that the issue was caused by the mcp-go implementation I was using and is now fixed.

Thank you!

[rafaeljusto]

For the record, the issue was fixed here: https://github.com/mark3labs/mcp-go/pull/379

[github-actions[bot]]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.