Show Notes
Learn about changes in Claude Code 2.1.312 that alter default system prompts and refusal fallback behaviors for custom model deployment names on Bedrock, Vertex, Foundry, and Mantle. We also cover crucial updates to hook concurrency limits, subagent compaction settings, and a fix preventing accidental overwrites of large CLAUDE.md files.
More from The Claude Code Changelog
In Claude Code 2.1.311, the ultrathink prompt keyword now actively raises the API effort parameter to xhigh for interactive terminal sessions. We also cover how compaction handles requests over 200K tokens, new telemetry behavior in VS Code, and MCP tool availability for subagents.
Discover how a prompt update in Claude Code 2.1.310 clarifies the impact of denying reads outside your working directory during auto mode, plus how to manage trusted paths with settings and the add dir flag. Also covered: fixes for headless MCP timeouts, tmux image rendering, and cloud setup script controls.
Claude Code 2.1.309 and 2.1.310 tighten sandbox and permission boundaries, including fixes for Windows hooks that could fail open. Learn how to check your version, test a blocking hook and an Edit deny rule, and diagnose Ubuntu sandbox startup issues with /sandbox.
Claude Code 2.1.310 enables the Monitor tool on Amazon Bedrock, Google Vertex, and Microsoft Foundry—even with telemetry or nonessential traffic disabled. Learn how to replace sleep-and-check loops with event-driven monitoring, configure permissions, and avoid leaving background monitors running.
Claude Code 2.1.309 adds a workspace-trust check to claude ultrareview. Learn how to handle the prompt, update scripts and CI with the correctly ordered --trust-workspace flag or the environment variable, and weigh the security and billing caveats. We also cover smaller updates to dangerous-command handling, sed -i, large nested CLAUDE.md files, sandboxed Bash startup files, and VS Code diagnostics.