Web Search tool - [github-mcp-server] error

[hellopahe]

Describe the bug

agent meet error when execute Web Search tools,

✗ Web Search (MCP: github-mcp-server) · Search Reddit for discussions mentioning "AI agent". Summarize common topics, notable thread…
  └ MCP server 'github-mcp-server': Error: Streamable HTTP error: Error POSTing to endpoint: [HTML error page omitted]

Affected version

1.0.25

Steps to reproduce the behavior

prompt copilot in interactive mode with this is a test, try to run web search for AI AGENT on reddit.

Expected behavior

No response

Additional context

No response

[quintindk]

Same issue experienced since 4/13/26

[hellopahe]

Same issue experienced since 4/13/26

@quintindk hey have you tried previous versions of cli?

[LelouchHe]

It has been failing since yesterday, though it was somehow recovered a few times for a short period.

and it sometimes has a different error message on my machine:

"Azure AI Agent request failed"

other github mcp tools are good, except this and web fetch tools for some sites. not stable

same on version 1.0.22 and latest 1.0.26

[hellopahe]

Seems like ok after update, web search has been ok with mine, how is it like on your side? @LelouchHe @quintindk

[quintindk]

All good, seems to have been resolved 17th April. Thank you! And keep up the good work!

[szabta89]

Thanks for reporting this.

We re-tested the reported behavior and confirmed it is resolved in GitHub Copilot CLI 1.0.78.

I'm closing this issue as completed. If you still encounter the problem on that version or newer, please share updated reproduction steps and we can take another look.