Claude Code v2.1.173

Released Jun 11, 2026 (2 months ago).

"References this build" means the issue body mentions running 2.1.173 (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 v2.1.173

Ranked by community engagement (reactions and comments).

• Advisor tool returns "unavailable" on claude-fable-5 whenever transcript exceeds ~100K tokens
  Open 💬 25 👍 45 #67609
• [BUG] API Error: Connection closed mid-response — occurs immediately in new context window
  Open 💬 19 👍 20 #69336
• Remote Control regression: server-injected `<system-reminder>Message sent at …>` prefix breaks slash commands from mobile/web
  Open 💬 6 👍 14 #68038
• [Bug] Terminal UI rendering broken in tmux and kitty terminals
  Resolved 💬 2 👍 8 #67507
• Remote Control: slash commands (/clear, /compact, /context, /bug) route to model as plain text instead of executing
  Open 💬 3 👍 7 #68252
• [BUG] TodoWrite re-stamps a front-of-context block on every update, invalidating the entire prompt cache (full ~900k-token rewrite per todo update)
  Resolved 💬 1 👍 7 #68140
• [BUG] Assistant text between tool calls is not displayed — regardless of focus view (only turn-initial and turn-final text renders reliably)
  Open 💬 4 👍 6 #67470
• [BUG] [SUGGESTION] Fable classifier broken completely
  Resolved 💬 7 👍 4 #67688
• [Bug] One transient advisor failure permanently latches the tool off for the whole session; distinct error causes flattened to generic "unavailable"
  Open 💬 5 👍 4 #67411
• [BUG] Regression v2.1.172: AltGr characters (@, €) swallowed in chat input on WSL2 — worked in v2.1.170
  Resolved 💬 5 👍 4 #67380
• [Feature Request] Add per-subagent effort/thinking control to align with Agent SDK
  Resolved 💬 4 👍 4 #67647
• Startup freezes ~26s in large monorepo when cwd is a subdirectory of the repo root (synchronous path remap of all tracked files)
  Resolved 💬 1 👍 4 #67401
• [BUG] Windows: case-sensitive `.claude.json` project-key lookup silently drops MCP servers across CLI/VS Code — recurring bug, repeatedly auto-closed unfixed
  Open 💬 0 👍 4 #67749
• [BUG] Mouse scroll triggers history:previous/history:next in chat input on WSL + Windows Terminal; null keybindings have no effect
  Resolved 💬 3 👍 3 #67630
• [Bug] TUI rendering corruption in tmux on macOS Terminal.app: input box duplicated at top of screen, text overlapping
  Resolved 💬 3 👍 3 #67553
• Stored /login credentials silently beat a valid CLAUDE_CODE_OAUTH_TOKEN (contradicts documented auth precedence)
  Open 💬 5 👍 2 #70124
• [Bug] Terminal mouse reporting interferes with copy-paste and scrollbar functionality
  Resolved 💬 2 👍 3 #68602
• [BUG] [area:tool-use] [platform:macos] Write tool's full-file-replacement default causes irrecoverable data loss on governed, untracked state files — no append-only or protected-path mechanism available
  Resolved 💬 11 #67917
• [BUG] "Out of usage credits" message doesn't say which limit was hit — Max subscribers buy extra credits unnecessarily
  Open 💬 5 👍 2 #67412
• [BUG] Windows: copy-on-select (OSC 52) never reaches RDP clipboard redirection under delegated system conhost
  Resolved 💬 3 👍 2 #67576
• [Bug] Mouse capture enabled by default breaks native terminal text selection and copy
  Open 💬 1 👍 2 #71826
• [BUG] Streaming partial-JSON parser silently produces empty MCP tool arguments (accumulator shear)
  Resolved 💬 4 👍 1 #67765
• [Bug] Parallel agent spawning causes excessive token consumption before crashing or hitting limits
  Open 💬 7 #67636
• [BUG] Claude Code installer places `claude.exe` in bin/ on Linux, install script does not create working symlink
  Resolved 💬 4 👍 1 #67586
• [Bug] Anthropic API Error: Incompatible advisor and request model combination
  Resolved 💬 1 👍 2 #67405
• Built-in deep-research workflow: Scope phase exhausts StructuredOutput retry cap on long briefs
  Resolved 💬 3 👍 1 #72267
• [Bug] File checkpointing silently stashes and hard-resets working tree, destroying uncommitted edits
  Resolved 💬 6 #68315
• [Bug] Anthropic API Error: Content Policy Flag with Model Fallback to Opus
  Resolved 💬 3 👍 1 #67452
• [BUG] Desktop app fails to display/index sessions migrated from another machine (works fine in CLI)
  Open 💬 2 👍 1 #69585
• [BUG] Workflow synthesis report contains incomplete and garbage data.
  Resolved 💬 2 👍 1 #69551

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