Claude Code v2.1.159

Released May 31, 2026 (3 months ago).

"References this build" means the issue body mentions running 2.1.159 (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 v2.1.159

Ranked by community engagement (reactions and comments).

• [FEATURE] Persistent config option to disable IDE context sharing (opened files, selections)
  Open 💬 10 👍 8 #68838
• [Bug] Opus 4.8: Tool calls serialized as plain text instead of tool_use blocks in high-composition sessions
  Resolved 💬 4 👍 7 #64418
• [BUG] CLAUDE_CODE_ATTRIBUTION_HEADER=0 also blocks auto classifier model
  Resolved 💬 5 👍 6 #64585
• Opus 4.8 Model stated multiple unverified claims as fact and fabricates specifics within a single session
  Resolved 💬 2 👍 7 #64329
• [BUG] /rewind (Esc Esc) silently reverts/loses code — destructive "Restore code and conversation" is the default with no confirmation
  Resolved 💬 12 👍 3 #64615
• [BUG] Claude Code activity in organisation analytics are missing some users
  Resolved 💬 5 👍 4 #64722
• PreToolUse(Bash) hook returning permissionDecision: "defer" causes "[Tool result missing due to internal error]"
  Open 💬 4 👍 4 #64389
• [Bug] Infinite loop when displaying `court` word
  Resolved 💬 3 👍 4 #64404
• Multi-minute first-byte stalls on claude-opus-4-8[1m], compounded by auto-mode classifier timeouts — sessions near-unusable
  Resolved 💬 3 👍 3 #64533
• [BUG] Max 20x account consumed 20% 5hr of tokens in 5mins with one session and lesss than 5k token usage
  Resolved 💬 3 👍 3 #64421
• [Bug] Frequent tool execution errors with Claude 4.8 Opus model
  Resolved 💬 3 👍 3 #64375
• [Bug] Claude Opus 4.8 API returning increased hallucinations
  Resolved 💬 3 👍 3 #64324
• [Bug] Edit tool fails on mixed literal/escape Unicode in multi-line old_string
  Open 💬 11 #64479
• [BUG] Fullscreen TUI: failed Bash tool output is empty when expanded
  Resolved 💬 5 👍 2 #64474
• [BUG] Claude Desktop 3P - Foundry config with Interactive Sign-in uses wrong url
  Resolved 💬 3 👍 2 #64677
• Background sessions (claude agents) drop work-phase OTEL logs (user_prompt/api_request) on shutdown
  Open 💬 6 👍 1 #64436
• Parallel tool calls: one benign tool error cancels all sibling calls → agent misreads as broken shell and flails
  Resolved 💬 3 👍 2 #64346
• [BUG] 1M context model switch without selecting the option
  Resolved 💬 2 👍 2 #64467
• Update banner should show the new version (and ideally a one-line summary)
  Resolved 💬 2 👍 2 #64358
• Harness-injected control text and tool-result content share one untagged channel — independent of phrasing
  Resolved 💬 7 #64539
• [BUG] Claude misspells username in working directory path, causing permission prompts
  Resolved 💬 1 👍 2 #64450
• Cost price-map wrong in CLI 2.1.159: claude-opus-4-8 billed 3× high, claude-sonnet-4-5 1.67× high
  Resolved 💬 3 👍 1 #64701
• Welcome banner shows stale "What should Claude call you?" value — not refreshed after the setting is changed
  Resolved 💬 3 👍 1 #64595
• [Bug] Tool Invocation Failure Blocking Workflow Execution
  Resolved 💬 3 👍 1 #64527
• [BUG] bug——"auto compaction not triggering at 95-100% context usage on Opus 4.6, version 2.1.159, have to manually run /compact"
  Resolved 💬 3 👍 1 #64504
• usage error on claude
  Resolved 💬 6 #64469
• [BUG] MCP: structuredContent overrides content field, losing actual tool response
  Resolved 💬 3 👍 1 #64316
• [BUG] Oversized-image 400 error triggers a retry loop that invalidates prompt cache and inflates cost ~35×
  Resolved 💬 5 #65636
• [Bug] Normal CLI session misclassified as background job, blocking Edit/Write tools
  Resolved 💬 2 👍 1 #64635
• [BUG] OAuth authentification fails on WSL2
  Resolved 💬 5 #64587

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