GitHub Copilot CLI v1.0.89 adds Auto routing suggestions, fixes Gemini MCP 400 errors

copilot-cli-release-app[bot] · ghdev · 2026-09-26

GitHub released Copilot CLI v1.0.89-4.

Added: Auto mode now suggests a routing tier (switchable via shortcut or click), and shows a quick feedback prompt after you switch away from a manually selected model.
Improved: Plugin installs can be enabled/disabled; disabled plugins stop loading and can be re-enabled with copilot plugin enable.
Fixed:
Auto tier cycling in /model; removed unsupported Fast profile (stored Fast preferences fall back to Balance)
Wrapped gh/git commands like timeout 60 gh ... now run correctly in sandboxed sessions
ACP sessions stay connected when clients pause reading large responses
Gemini models no longer fail with 400 invalid request body when an MCP server's tool schema puts a type or properties beside anyOf (e.g. nullable discriminated unions)
GitHub MCP tools connect correctly on first CLI startup after sign-in

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