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Claude Code Issues / Versions / v2.1.63

Claude Code v2.1.63

Released Feb 28, 2026 (6 months ago).

⚠ Elevated report volume. This build drew 449 issue reports — more than double the typical release (160 median). That can mean a regression, or simply that many users happened to be on this build. Skim the reports below before deciding to upgrade.
449 issues reference this build
12 still open
437 resolved (97%)

"References this build" means the issue body mentions running 2.1.63 (from the bug-report template). It reflects report volume, not a proven defect count — an issue may mention a version without being caused by it. First-party data from the anthropics/claude-code tracker.

Top issues reported on v2.1.63

Ranked by community engagement (reactions and comments).

Changelog

What's changed

  • Added /simplify and /batch bundled slash commands
  • Fixed local slash command output like /cost appearing as user-sent messages instead of system messages in the UI
  • Project configs & auto memory now shared across git worktrees of the same repository
  • Added ENABLE_CLAUDEAI_MCP_SERVERS=false env var to opt out from making claude.ai MCP servers available
  • Improved /model command to show the currently active model in the slash command menu
  • Added HTTP hooks, which can POST JSON to a URL and receive JSON instead of running a shell command
  • Fixed listener leak in bridge polling loop
  • Fixed listener leak in MCP OAuth flow cleanup
  • Added manual URL paste fallback during MCP OAuth authentication. If the automatic localhost redirect doesn't work, you can paste the callback URL to complete authentication.
  • Fixed memory leak when navigating hooks configuration menu
  • Fixed listener leak in interactive permission handler during auto-approvals
  • Fixed file count cache ignoring glob ignore patterns
  • Fixed memory leak in bash command prefix cache
  • Fixed MCP tool/resource cache leak on server reconnect
  • Fixed IDE host IP detection cache incorrectly sharing results across ports
  • Fixed WebSocket listener leak on transport reconnect
  • Fixed memory leak in git root detection cache that could cause unbounded growth in long-running sessions
  • Fixed memory leak in JSON parsing cache that grew unbounded over long sessions
  • VSCode: Fixed remote sessions not appearing in conversation history
  • Fixed a race condition in the REPL bridge where new messages could arrive at the server interleaved with historical messages during the initial connection flush, causing message ordering issues.
  • Fixed memory leak where long-running teammates retained all messages in AppState even after conversation compaction
  • Fixed a memory leak where MCP server fetch caches were not cleared on disconnect, causing growing memory usage with servers that reconnect frequently
  • Improved memory usage in long sessions with subagents by stripping heavy progress message payloads during context compaction
  • Added "Always copy full response" option to the /copy picker. When selected, future /copy commands will skip the code block picker and copy the full response directly.
  • VSCode: Added session rename and remove actions to the sessions list
  • Fixed /clear not resetting cached skills, which could cause stale skill content to persist in the new conversation