GitHub Copilot CLI v1.0.66

GitHub Copilot CLI v1.0.66 was released on June 30, 2026.

Summary

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-blinking cursor that restores your settings when you exit. We've also improved how the tool handles large outputs and made the timelin...

Release Notes

2026-06-30 - Use a non-blinking block cursor during interactive sessions, restoring your terminal's default cursor on exit - Add support for Claude Opus 4.8 Fast and deprecate Claude Opus 4.6 Fast - MCP add/edit form accepts HTTP-style Key: value headers - Keep LSP servers from starting twice during startup - Avoid blocking commands that contain Windows-style path fragments - Let Copilot read output from and stop detached background shell commands - Large output handling now respects custom output directories and a disable setting - Prevent PR description generation from crashing on empty assistant responses - Render the timeline as a compact "highlight reel" with single-line tool and reasoning rows for all users - Add @ file and GitHub ref completions in relay sessions - Show the correct session age when filesystem birthtime is missing - Prevent duplicate final assistant messages for GPT models - Terminal title updates work in more terminals - Show a (sandboxed) badge on compact Search timeline entries - Git commands work in sandboxed linked worktrees - Show the current pull request link as a status-line item - Show quota snapshots for WebSocket Responses requests - Show accurate Anthropic reasoning token counts - Let grep and glob retry blocked searches after sandbox approval - Format terminal titles with the session title and GitHub Copilot suffix - Skip synchronized output under tmux to avoid mouse pointer flicker - Session limits now apply across the current conversation, reset on /clear, and use the sessionLimits option key. - Hide excluded built-in agents from agent selection - BYOK sessions using Anthropic models no longer hit HTTP 400 errors from adaptive-thinking mismatches — neither from injecting adaptive thinking on models that don't support it, nor from sending standard thinking to models that require adaptive. Thinking-mode selection for dual-mode models is unchanged. - Allow skills with the same name from different plugins to coexist - Let integrations read and write CLI user settings - View LSP server logs in /lsp logs and readagent - Prompt to install gh CLI when it is missing in GitHub repositories - Add GitHub attachment variants to prompt rendering - Extension toggles preserve the selected mode - Return to the prompt after cancelling attached shell commands - Keep background git status checks from disrupting concurrent git commands - Recover corrupted session history on load - Preserve newlines in /after and /every scheduled prompts - Keep multi-line /worktree tasks intact when starting them - Make /cd path completion keep Enter, Escape, and Tab behavior in sync - Keep session-store searches and context lookups responsive - Show desktop notifications on macOS from the CLI - Paste WSL images when Windows env vars are unavailable - Keep selection on the adjacent task after removing one - readagent sinceturn: 0 now correctly returns all turns including turn 0 - Filter non-JSON stdout lines from MCP servers during startup - Perform tokenizer warmup in parallel on a background thread for better startup performance - Show submit times next to user prompts in the timeline - Improve /share to manage synced session visibility - Expand @-style imports in AGENTS.md, CLAUDE.md, and Copilot instruction files - Make /pr auto keep working through CI, review, and merge queue - Clicking to expand a compact timeline entry holds it in place and reveals its content downward - Configure subagent concurrency and depth limits in /settings (usage-based billing users) - Add /chronicle skills review for reviewing proposed draft skill changes, with options to accept, reject, or defer each draft - Add desktop notifications for attention prompts and idle sessions - Make /share use Mission Control links for session sharing - Snapshot creation retries transient HEAD lookup failures instead of crashing - Keep /chronicle reindex responsive and show progress in the timeline - Return to the last open GitHub issue, pull request, or gist view when switching tabs - Resolve package argument placeholders when installing MCP registry entries - Keep queued messages from getting stuck behind background work - Retry managed settings fetch after transient connection-pool errors - Stop showing broken-pipe errors when a sandboxed MCP server exits mid-request - Properly recover MCP host-delegated connections when OAuth tokens expire or need broader scopes - CLI git checks skip optional locks so status and branch lookups keep working in busy repositories - Collapse multi-line sub-items into one inline line in compact timeline rows - Inline hook settings now handle nested Claude-style hook groups correctly - Keep the CLI responsive during secret filtering - Search inputs match queries that have leading or trailing whitespace - Keep idle agents available after you cancel a turn - Show sandbox-bypass warnings and label bypassed commands - /pr auto now starts a self-paced loop that fixes one thing per run and paces itself around CI to drive the PR to green; /pr automerge keeps going until the PR is merged. Manage or stop it from /loop or /every. - Enable /rename in remote-hosted (cloud and relay) sessions - Add toggle to enable or disable MCP servers in the CLI from MCP list view - Add experimental response limits controls to CLI settings - Let managed settings configure OpenTelemetry export - MCP tools on OAuth-authenticated remote servers now recover automatically after a mid-session token expiry, matching the existing OIDC retry behaviour. A 401 during a tool call triggers a non-interactive reconnect, and servers needing interactive re-auth are retried at the start of the next turn. - Add persisted dynamicRetrieval setting (and --dynamic-retrieval skills=<on|off> flag) to enable or disable embeddings-based retrieval of skills - Let custom agents set reasoning effort in their definitions - Pass a task to /worktree (e.g. 'fix the login redirect') to name the branch for that task and run the sentence as the first prompt in the new worktree - Added runtime telemetry for the MCP host token-injection OAuth flow, recording when an OAuth broadcast is emitted to the host and how the host responds (token or cancelled) with response latency - Show merge status for each pull request in the Pull requests tab, and refresh the cached statuses on demand by pressing r - Fix a soft hang where the CLI stopped responding to input if a startup prompt (folder trust, screen reader, or Copilot free signup) opened while a non-Main home tab was focused - Guide the agent to format cross-repository issue/PR references as owner/reponumber (reserving bare number for the current repo) so they don't mislink to the current repository - Keep /restart working when shutdown teardown takes too long - Copy text to the clipboard on WSL when cmd.exe is not on PATH - COPILOTHOME and --config-dir stop loading skills from ~/.agents/skills - Keep per-extension disabled selections when switching extension mode in /extensions - Copying wrapped text from the scroll view keeps spacing correct - Voice mode turns itself off when the engine fails to start at boot - Quit cleanly with Ctrl+D during startup before authentication completes - Keep framed user messages from clipping trailing characters at the right edge - Inline images stop writing to the shell after exit - Display descriptions for slash command subcommands - Refresh MCP server headers automatically after authentication changes - LSP commands and tools resolve project configs and server paths more reliably - Add --allow-all-mcp-server-instructions to optionally include instructions from all MCP servers in system prompts - Auto-accept opt-in MCP consent prompts in --yolo sessions while still showing system permission prompts - Use the full terminal height in full-screen views - Use clearer icons for shell and search timeline entries - Match the terminal text color to the GitHub theme canvas - Show the active agent mode in the working footer text - /worktree keeps a valid branch name exactly as typed, e.g. feature/JIRA-123, instead of flattening it to a slug like feature-jira-123 - With no argument, /worktree names the branch from your uncommitted changes and recent conversation using your active model instead of a fixed small one - Consolidate color palette settings under /settings theme - Store CLI settings and session state more reliably

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Other Recent GitHub Copilot CLI Releases

• v1.0.71 (July 16, 2026)
• v1.0.70 (July 10, 2026)
• v1.0.69 (July 7, 2026)
• v1.0.68 (July 1, 2026)
• v1.0.64 (June 23, 2026)

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