Summary
GitHub shipped Copilot CLI v1.0.78, adding a live tool-call timeline that shows how long each tool call takes (ticking live for calls of five seconds or more, on by default), an experimental /new-worktree command that creates a git worktree and starts a fresh conversation in it, faster session resume, and improved sandbox, permissions, and MCP handling.
What changed
On August 3, 2026 GitHub released Copilot CLI v1.0.78, adding live per-tool-call durations in the timeline, an experimental /new-worktree command, faster session resume, browser-default login for local desktop subprocesses, and better sandbox, permissions, and MCP handling.
Why it matters
Terminal-based coding agents are competing on transparency and control of long-running tool calls. Live tool-call timing makes agent runs easier to reason about, and worktree support fits the parallel-agent workflow where developers run multiple agent sessions against isolated branches.
Evidence excerpt
Timeline headers show how long each tool call took, right-aligned and ticking live while it runs (for calls of at least 5 seconds).