Copilot Chat v0.43: Agent Discovery & Tool Fixes

TL;DR

• Agent discovery now finds AGENTS.md and CLAUDE.md at workspace roots
• Fixed tool_choice handling in summarization and speculative requests
• Improved session initialization and summarization budget management

New

• Agent discovery at workspace roots — AGENTS.md and CLAUDE.md files are now discovered and loaded from workspace root directories, making agent configuration more discoverable.
• CopilotCLI customization provider enhancements — Agent instructions now properly emit through the customization provider, and plugins are wired through for better extensibility.
• Session type context for skills — Explicit session type context is now available for skills, improving context awareness in chat sessions.

Fixed

• Tool choice in summarization — tool_choice is now only sent when tools are actually present, preventing malformed requests.
• Speculative request caching — Cached speculative results now correctly use speculativeRequestDelay instead of bypassing it.
• Malformed edits on fetch failure — Edits are no longer yielded when fetch operations fail or are cancelled.
• Tool call flushing — Only confirmed tool calls are now flushed, preventing stale or unconfirmed operations.
• Summarization fallback gaps — Background summarization fallback logic improved with better budget management.
• Backward compatibility guards — Added guards for hooks and plugins APIs to maintain compatibility with existing extensions.

Improved

• Dependency updates — Electron bumped to 39.8.5; Anthropic SDK packages updated (@anthropic-ai/sdk 0.81.0→0.82.0, @anthropic-ai/claude-agent-sdk 0.2.81→0.2.91).
• Model family hashing — Refined hash set logic with model family names for better model identification.

Update: Install the latest version via the VS Code Extensions marketplace or run code --install-extension GitHub.Copilot-Chat.

Source: Copilot Chat