GitHub Copilot CLI — June 2026 Releases
11 releases in June 2026.
What's new in GitHub Copilot CLI, June 2026
GitHub Copilot CLI adds Rubber Duck, /settings, a new UI and sandbox bypass controls
GitHub Copilot CLI in June 2026 turned on Rubber Duck by default, added a /settings dialog and a new GitHub-themed UI, and gave users more control over the sandbox. Eleven releases shipped, from v1.0.57 to v1.0.67.
The Rubber Duck agent is enabled by default and gets a /rubber-duck command for adversarial feedback on code and designs; automatic invocation is controlled by builtInAgents.rubberDuckAutoInvoke and is off by default. Subagent model, reasoning effort and context tier can be set via /subagents. Scheduled prompts (/every, /after) arrived under /experimental. On models, the notes add max reasoning effort for Anthropic models, Claude Fable 5, Claude Opus 4.8 Fast (Opus 4.6 Fast is deprecated) and Claude Sonnet 5. MCP gained auto-loading from .github/mcp.json, a deferTools option and static OAuth client overrides. There is also an option to bypass the sandbox for shell commands, and disabling it for the session now applies immediately. The rest was terminal rendering, Windows and tmux fixes, and session resume reliability.
- Rubber Duck enabled by default (v1.0.58); /rubber-duck command added (v1.0.59); builtInAgents.rubberDuckAutoInvoke controls auto-invocation (v1.0.60)
- /settings interactive dialog to browse and edit all user settings in one place (v1.0.61)
- Option to bypass the sandbox for shell commands (v1.0.64); disabling it for the session takes effect immediately (v1.0.67)
- MCP servers auto-load from .github/mcp.json (v1.0.61); deferTools option keeps a server's tools always available (v1.0.63)
- New model support: Claude Fable 5 (v1.0.61), Claude Opus 4.8 Fast (v1.0.66), Claude Sonnet 5 (v1.0.67)
- Subagent model, reasoning effort and context tier configurable via settings or /subagents (v1.0.62)
Upgrading from v1.0.56? See every change through v1.0.67.
- v1.0.67 (June 30, 2026) — GitHub Copilot CLI v1.0.67 makes sandbox controls work instantly so you won't get interrupted mid-command, and adds Claude Sonnet 5 as a new model opt
- v1.0.66 (June 30, 2026) — GitHub Copilot CLI v1.0.66 now supports Claude Opus 4.8 Fast for smarter AI assistance and introduces a sleeker terminal experience with a non-blinkin
- v1.0.65 (June 24, 2026) — 2026-06-24 - /cd now persists the working directory so resuming a session returns to it, and discovers custom agents in the new directory - Commands w
- v1.0.64 (June 23, 2026) — 2026-06-23 - Path access prompt shows resolved symlink targets so you can see exactly what access is being granted - Show the pay-as-you-go additional
- v1.0.63 (June 16, 2026) — 2026-06-15 - Blocked image attachments now explain what to do — enable vision via the "Editor preview features" policy, switch to a vision-capable mod
- v1.0.62 (June 13, 2026) — 2026-06-13 - Ask and elicitation dialogs now scroll together with the timeline instead of taking over the screen, so a tall dialog no longer hides the
- v1.0.61 (June 9, 2026) — 2026-06-09 - Polish /agents picker and Create New Agent wizard with consistent borders, headers, and styled inputs - Fixed a bug where resuming a sess
- v1.0.60 (June 5, 2026) — 2026-06-05 - Tab completes .. parent traversal in slash-command path arguments instead of switching tabs - Add the max reasoning effort level for Anth
- v1.0.59 (June 2, 2026) — 2026-06-02 - Actionable error message shown when GitHub API rate limit is hit during copilot update - Add /rubber-duck command for adversarial feedbac
- v1.0.58 (June 2, 2026) — - Rubber Duck is now enabled by default - Remote JSON RPC is now enabled by default - /experimental schedule prompts with /every and /after - /experim
- v1.0.57 (June 1, 2026) — 2026-06-01 - Actionable error message shown when GitHub API rate limit is hit during copilot update - Plugin slash commands (/plugin install, uninstal