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MCP OAuth in headless session times out #3039
Description
Describe the bug
When performing OAuth authentication against a remote https mcp server on a machine without browser, it spins waiting to open a browser and eventually times out and fails.
Affected version
v1.0.40-0
Steps to reproduce the behavior
Created a basic ubuntu 24 docker image with no UI elements that I can ssh into, install copilot cli, and run through the /mcp add flow. It will fail during the authentication step.
Expected behavior
Ideally would like a fast fail if it can't identify a browser, and then device flow for oauth (assuming it's supported by the mcp)
Additional context
No response
Reacted by Benedikt Fischer, ecitaire-mpp, Artem Leshchev and Vitalik Gordon
Activity
patniko commentedon Oct 26, 2026
Thanks for the report. We've shipped fixes in this area since this was filed (most recently in Copilot CLI v1.0.69), and we believe this may now be resolved. Could you retest on the latest release (Copilot CLI v1.0.103) and let us know whether you still see it? If we don't hear back in a couple of weeks, we may close this issue — you can always reopen it.
Triaged as part of a Copilot SDK backlog review, with help from GitHub Copilot.