GitHub Copilot CLI v1.0.40: Headless MCP Auth via client_credentials OAuth, Subagent Model Evaluation Fix, and Orchestrator-Based /research

GitHub Copilot CLI Releases·medium signal

GitHub Copilot CLI v1.0.40 shipped May 1 with client_credentials OAuth grant type for MCP servers enabling fully headless authentication without a browser — critical for CI/CD agent deployments. Subagents now correctly evaluate tool search support for their own model instead of inheriting parent session settings. The /research command was rebuilt using an orchestrator/subagent architecture for more thorough and reliable deep research results.