Claude Code v2.1.266

Released Sep 8, 2026 (5 days ago).

"References this build" means the issue body mentions running 2.1.266 (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 v2.1.266

Ranked by community engagement (reactions and comments).

• [BUG] Cowork cloud sandbox: egress allowlist collapses to ~5 hosts despite account setting "All domains"
  Resolved 💬 34 👍 3 #93525
• [BUG] --resume loses [1m] context window on non-first-party ANTHROPIC_BASE_URL when session model differs from default
  Resolved 💬 0 👍 9 #93021
• You've hit your session limit · resets 1pm (America/Los_Angeles)
  Open 💬 3 👍 1 #93148
• [BUG] Slash command autocomplete popup only triggers for the first command
  Open 💬 2 👍 1 #92991
• [BUG] Diff panel opens automatically in fullscreen mode without running /diff
  Open 💬 1 👍 1 #93160
• [BUG] Deleted artifacts are re-armed as watches at every session start, emitting a permanent notice per artifact
  Open 💬 0 👍 1 #93712
• Allow disabling click-to-select on option lists without losing text selection or scrolling
  Open 💬 0 👍 1 #93162
• [BUG] Stdio MCP servers still connecting (or queued) at session end are never terminated and are left orphaned
  Open 💬 3 #93087
• [BUG] /model omits Opus 5 when authenticated via CLAUDE_CODE_OAUTH_TOKEN, but not via stored login
  Resolved 💬 3 #93070
• [BUG] Claude Code 2.1.266 crashes with "Bus error" on WSL2 (npm/NVM install) — 2.1.265 works
  Open 💬 0 👍 1 #93038
• 2.1.266: Artifact tool schema uses \p{...} Unicode property escapes in pattern — 400 invalid_request on Anthropic-compatible endpoints (z.ai GLM)
  Open 💬 0 👍 1 #93029
• Auto-update silently drops all Remote Control bridges; running sessions cannot reconnect
  Open 💬 2 #94049
• [BUG] MessageDisplay no longer fires for text between tool calls (regression)
  Open 💬 2 #93531
• [Bug] Usage limit not enforced - allows spending beyond configured credit limit
  Open 💬 2 #93255
• Bash tool fails on every command: bwrap can't mkdir /run/containerd/containerd.sock (Permission denied)
  Open 💬 2 #93144
• Prompt-cache forensics from 30 real sessions: 68% of cache writes come from 36 events (TTL expiry, microcompact, resume) — with paper-backed mitigations
  Open 💬 1 #94177
• [BUG] Workflow started 189 additional subagents after a session-limit error, with no recorded usage
  Open 💬 1 #93874
• MCP connect is issued before `headersHelper` resolves — slow helpers silently lose their auth header
  Open 💬 1 #93776
• Windows desktop app ignores defaultShell: "bash" for ! commands, always uses PowerShell
  Open 💬 1 #93662
• [BUG] Desktop: "New session" from a sidebar group (or from a cloud session) silently clears the remembered project folder; next sessions start as "No folder"
  Open 💬 1 #93637
• I don't have a bug report draft to send. I'm Claude Code, Anthropic's CLI assistant, and I'm ready to help you generate a concise GitHub issue title. To create an issue title, please provide me with: 1. **Description of the bug** - What went wrong? 2. **
  Resolved 💬 1 #93375
• I appreciate you providing context, but I need to clarify my role: I'm designed to generate GitHub issue titles based on actual bug reports for Claude Code. Your message appears to be a security researcher attestation rather than a bug report. To help you
  Resolved 💬 1 #93273
• [Bug] Anthropic API Error: Incorrect [cyber] Flag Classification for Authorized Security Assessment
  Open 💬 1 #93272
• [FEATURE] Quiet turns: let the model end a turn with nothing after a Monitor or channel event, and render nothing when it does
  Open 💬 1 #93205
• [Feature Request] Claude model should respect CLAUDE.md configuration file directives
  Open 💬 1 #93191
• [BUG] Streamable HTTP MCP tool call still times out ("The operation timed out") at ~6min despite per-server timeout, CLAUDE_CODE_MCP_TOOL_IDLE_TIMEOUT=0, and a requestTimeout=0 server
  Open 💬 1 #93143
• run_in_background reports a self-backgrounding command as completed instantly, orphaning the process
  Open 💬 1 #93126
• Ctrl+key bindings ignored under non-Latin layouts on iTerm2: Claude Code overrides its own kitty push with modifyOtherKeys
  Open 💬 1 #93113
• [Bug] Agent responds to GitHub comments without user authorization
  Open 💬 1 #93064
• [Bug] Rewind does not restore deleted tracked git files
  Open 💬 1 #93045

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