GitHub Copilot CLI received an improvement called smarter subagent delegation, now rolled out to 100% of production traffic (version 1.0.42+). The change makes the main agent more selective about when to hand off work to subagents versus handling tasks directly. By using LLMs to analyze agent trajectories and identify unnecessary delegation patterns, the team refined the orchestration policy so simple, focused tasks stay with the main agent while subagents are reserved for broad, cross-cutting, or parallelizable work. In A/B testing, this reduced tool failures per session by 23% (including 27% fewer search tool failures and 18% fewer edit tool failures), improved P95 wait time by 5%, and P75 by 3%, with no quality regression. The improvement is entirely behind the scenes — developers don't change their workflow.
