Released Jul 22, 2026. Everything the community has pinned to this exact release.
A long session dies mid-turn with a 400 and the instruction to run /rewind. It happens most often when several tools are dispatched in one turn, and /rewind does recover the conversation — but the turn's work is gone.
Eight days migrating a legacy widget suite to WidgetKit with Claude Code and XcodeBuild MCP: timeline budgets, a haunted pbxproj, and $84 of tokens.
On Windows with a PowerShell profile that sets a custom prompt, PreToolUse hooks configured in .claude/settings.json silently never execute. No error, no log line — tool calls just proceed unguarded. Fixed in 2.1.219.
Reproduction evidence on 2.1.218
| Problem | Version | OS | Outcome | Status |
|---|---|---|---|---|
| Claude Code keeps rewriting package-lock.json | 2.1.218 | Ubuntu 24.04 | Reproduced | Workaround Verified |
| API Error: 400 due to tool use concurrency issues. Run /rewind to recover the conversation. | 2.1.218 | macOS 15.5 | Reproduced | Workaround Verified |
| PreToolUse hooks never fire under PowerShell profiles on Windows | 2.1.218 | Windows 11 | Reproduced | Fixed |
| Claude Code ignores repository instructions after compaction | 2.1.218 | macOS 15.5 | Reproduced | Active Issue |