This release adds 2 notable features for engineering teams evaluating rollout.
Published 18d
Developer Productivity
✓ No known CVEs patched
✓ No known CVEs patched in this version
Affected surfaces
auth
breaking_upgrade
Summary
AI summaryFixed claude attach erroring during mid-upgrade restarts and added streaming for auto-update binary downloads.
Full changelog
What's changed
- Added an auto mode rule that blocks tampering with session transcript files
- Fixed
--json-schemasilently producing unstructured output when the schema was invalid, and schemas using theformatkeyword being rejected - Fixed a message sent while Claude was working being silently lost when the turn ended at the
--max-turnslimit - Fixed Windows worktree removal deleting files outside the worktree when an NTFS junction or directory symlink existed inside it
- Fixed background agents staying shown as "failed" or "completed" in the agent list after being resumed with
SendMessage - Fixed background jobs flipping from "needs input" back to "working" in the agent list when the agent's turn contained no readable text
- Fixed
claude attacherroring when a background agent was mid-upgrade restart instead of waiting for it to come back - Fixed session-to-PR linking missing a PR created in a Bash call whose output exceeded the 30K inline limit
- Fixed
claude mcp add-from-claude-desktopgetting stuck when a server name contains unsupported characters; invalid names are now reported and remaining servers still import - Fixed a plugin LSP server that fails to initialize preventing a valid LSP server from another plugin handling the same file extension
- Fixed a Windows crash when the directory Claude was launched from is deleted, locked, or unmounted while a command is running
- Fixed a crash when a file watcher was closed while a directory scan was still in flight
- Fixed project verify skills being rewritten on every session instead of only when a documented command changed
- Fixed the agent view rendering one line too high and clipping its header when the job list slightly overflowed the screen
- Fixed background tasks in the web and mobile Remote Control panels showing stale "Running" status by forwarding full task state on every membership change
- Improved auto mode to ask before running
rm -rfon a variable it can't resolve from context - Auto-update binary downloads now stream to disk instead of buffering in memory, cutting the updater's peak memory usage by roughly 400 MB
- Background task notifications now explicitly state that no human input has occurred, preventing fabricated in-transcript approvals from being acted on
- Improved agent view: sessions that edit, merge, comment on, or push to an existing PR now link it in
claude agents - Improved agent view: rows now show a colored state word and a classifier-written headline instead of raw tool call text, and the peek opens with full status including the exact ask for blocked sessions
/doctoris now a full setup checkup that can diagnose and fix issues;/checkupis its alias- Reserved the "Claude Browser" MCP server name (alongside "Claude Preview") ahead of the Claude Desktop pane rename; user-configured MCP servers can no longer register under either name
- Fixed Cowork VM-mode local-agent sessions failing to start with "Not logged in · Please run /login" on CLI 2.1.203+
Weekly OSS security release digest.
The CVE patches and breaking changes that affected production tools this week. One email, every Sunday.
No spam, unsubscribe anytime.
Share this release
About claude-code
All releases →Related context
Earlier breaking changes
- v2.1.215 Claude no longer automatically runs /verify and /code-review skills
- v2.1.160 Renames dynamic‑workflow trigger keyword from `workflow` to `ultracode`; `workflow` no longer triggers a run
- v2.1.160 Deprecates and removes the `CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE` environment variable; it is now a no‑op
- v2.1.147 Renames /simplify to /code-review; removes cleanup-and-fix behavior.
Beta — feedback welcome: [email protected]