GitHub Copilot CLI v1.0.56

GitHub Copilot CLI v1.0.56 was released on .

Summary

2026-05-29 - Free and Student users can select models other than Auto in the model picker - ThemePicker side-by-side layout fits within a 120-column terminal without wrapping - Model picker shows a...

Release Context

  • This was the 99th GitHub Copilot CLI release of 2026 tracked by Havoptic.
  • It shipped 1 day after GitHub Copilot CLI v1.0.55 (May 28, 2026).

Shipped around the same time

Within 3 days of this release, other AI coding tools also shipped:

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Release Notes

2026-05-29 - Free and Student users can select models other than Auto in the model picker - ThemePicker side-by-side layout fits within a 120-column terminal without wrapping - Model picker shows accurate total context window size per pricing tier - Add builtInAgents.rubberDuck setting to enable or disable the rubber duck agent via copilot config - Extended key reporting works correctly in tmux when Kitty keyboard protocol is unavailable - Config and settings files are written atomically to prevent data loss when multiple CLI processes run concurrently - BYOK provider configuration now applies correctly to ACP sessions - MCP tools that return both human-readable content text and a structuredContent payload now surface both to the agent instead of dropping either side. When the text is the literal JSON serialization (per MCP spec §5.2.6) it is deduplicated; otherwise the two are concatenated. - Fix /context small-token legend formatting and free-space grid rounding - Reasoning effort picker respects model capabilities — options not supported by the model are no longer shown - File paths in /env output display with correct formatting - Reasoning text always displays above the assistant response in the conversation timeline - Assistant responses render without single-word orphan lines in the terminal timeline - Diff view uses a continuous scroll layout with sticky file and hunk headers, full terminal width, and theme-aware colors - webfetch tool prefers markdown content when available, using HTTP content negotiation for cleaner results from documentation sites - Cursor stays at correct position after pasting text that contains tab characters - Code review agent now uses the same model as the current session instead of a fixed default - When gh CLI is on PATH, GitHub MCP server now omits redundant gh-replaceable tools by default, reducing token usage - Context window tier selection now persists durably in session events and survives SDK-only resume paths so tier-derived limits are reapplied to request, compaction, and truncation logic without app-level repair - Remote session URL correctly uses the repository owner/name instead of literal 'copilot' - Trusted folder confirmation message clarifies that permissions may be remembered for the session

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