Claude Code v2.1.258

Released Sep 1, 2026 (1 day ago).

"References this build" means the issue body mentions running 2.1.258 (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 v2.1.258

Ranked by community engagement (reactions and comments).

• [BUG] Cowork local sessions: all mcp__workspace__* tools denied without any prompt after SDK 2.1.258 (Windows)
  Open 💬 3 👍 3 #91565
• [BUG] Cowork (Windows, host-loop): every mcp__workspace__bash call denied since Claude Desktop 1.44121.1 / Claude Code 2.1.258 — the app's own --disallowedTools Bash now matches the workspace shell via toolAliases
  Open 💬 1 👍 2 #91622
• [Bug] Rate limit consumed prematurely - 5 hour window exhausted in 30 minutes
  Open 💬 0 👍 2 #91471
• [BUG] Cowork (Windows): mcp__workspace__bash denied in every session after updating to 1.44121.1.0 — worked on 1.40609.1.0
  Open 💬 1 👍 1 #91594
• Cowork: mcp__workspace__bash and web_fetch denied in all sessions after desktop 1.44121.1 update (Windows)
  Open 💬 0 👍 1 #91582
• [BUG] Desktop app's bundled Claude Code crashes on macOS 12 (dyld: _DNSServiceGetAddrInfoEx) while the standalone CLI runs fine
  Resolved 💬 3 #91381
• You've hit your session limit · resets 6pm (Europe/Warsaw)
  Open 💬 2 #91476
• [BUG] Recursive FileChanged watchPaths registration over a large NFS directory blocks the main thread at startup (D state, rpc_wait_bit_killable)
  Open 💬 1 #91634
• [BUG] Startup FileIndex blocks the event loop for ~41s when cwd is a large non-git directory (home dir, ~65k files)
  Open 💬 1 #91633
• [FEATURE] Cowork can't read the user's own published artifacts — no authenticated read path, unlike Claude Code
  Open 💬 1 #91611
• [BUG] Cowork: publishing an artifact silently stops updating its local copy in ~/Claude/Artifacts, and the directory mtime hides it
  Open 💬 1 #91610
• [BUG] Cowork (Windows): every mcp__workspace__bash call denied "by rule" since Desktop 1.44121.1 / Claude Code 2.1.258 — --disallowedTools Bash now propagates to the aliased Cowork tool
  Open 💬 1 #91605
• I don't have enough information to generate a GitHub issue title from just a Request ID. To create an appropriate title, I would need details about: - What the actual bug or issue is - What error message occurred (if applicable) - What the expected vs act
  Open 💬 1 #91593
• [BUG] Windows desktop 2.1.258: 'Split view' missing from the 'Open in' submenu (shows New window / Explorer / Cloud)
  Resolved 💬 1 #91575
• [BUG] macOS sandbox: System V shared-memory and sysctl calls are refused with EPERM whenever two sandboxed Bash commands run at the same time — and a refused shmget/shmctl still leaves the segment allocated
  Open 💬 1 #91555
• [BUG] Remote HTTP MCP server never re-probed after a transient network drop; misreported as UNKNOWN_CERTIFICATE_VERIFICATION_ERROR
  Open 💬 1 #91542
• [BUG] VS Code extension: showMessageTimestamps, timeFormat and timeZone are documented in the schema but never read
  Open 💬 1 #91509
• [Bug] Session limit reached prematurely; automatic session resumption after reset
  Resolved 💬 1 #91486
• Monitor: log-follow watch gives no signal when the log's writer dies; request a liveness/exit event
  Resolved 💬 1 #91450
• [BUG] Permission mode selector not shown in the iOS composer during an active Code session
  Open 💬 1 #91446
• Cowork/synced plugin packs can't be listed, inspected, or disabled; claude plugin details can't resolve them
  Open 💬 1 #91440
• docs: subagent frontmatter `effort` field is implemented but undocumented
  Open 💬 1 #91415
• Assistant emitted a fabricated user message and acted on it as authorization (ran git commit)
  Open 💬 1 #91396
• [BUG] Artifact tool loads ~12k tokens of schema into every claude.ai-backed session, eagerly, with no way to opt out except a deny rule
  Open 💬 1 #91395
• [Bug] Fable 5+ consistently ignores defined skills and creates incorrect memory workarounds
  Open 💬 1 #91391
• [BUG] Can not /login via SSH - URL is not displayed nor is it copy-able
  Open 💬 1 #91358
• [Bug] Model generates unsupported generalizations from insufficient sample data
  Open 💬 0 #91698
• autoUpdates: false in ~/.claude.json is ignored on native installs; updated twice in two days, once mid-session
  Open 💬 0 #91646
• [Cowork][Windows] CoworkVMService idle-shuts down the VM, then the app spins on the missing named pipe forever and never restarts the service
  Open 💬 0 #91645
• Remote MCP OAuth: shared user-scope refresh token breaks against IdPs with single-use refresh-token rotation (ODC)
  Open 💬 0 #91641

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