Copilot Chat v0.40.2026031601: Session & Cache Fixes
Copilot Chat v0.40.2026031601 fixes session logging initialization, improves Anthropic cache handling, and adds context guardrails for agents.
TL;DR
- Fixed sessionLogDir not being set for new chats
- Improved cache breakpoint handling for Anthropic Messages API
- Added context management guardrails for Anthropic agents
Fixed
- sessionLogDir not set for new chats — Session logging directory now properly initialized when creating new chat sessions.
- Message-level cache breakpoints eviction — Stopped incorrectly evicting cache breakpoints when using Anthropic Messages API.
New
- Context management prompt guardrails — Added safety guardrails for Anthropic agents to manage context more reliably.
- View image tool setting — New configuration option for the view image tool in chat.
- Compaction summaries tracking — Now tracks compaction summaries as an array with detailed metrics metadata for better observability.
Improved
- Agent Debug display — Shows correct status and enriched runSubagent tool naming for better debugging visibility.
- Image resizing — View image tool now uses resizeImage from core for consistency.
- Dependencies — Updated undici from 7.22.0 to 7.24.0.
Update via VS Code extensions marketplace or run: code --install-extension GitHub.Copilot-Chat
Source: Copilot Chat
