[Bug] Anthropic API Error: Missing Tool Result Blocks

Resolved 💬 3 comments Opened Sep 29, 2025 by jackstine Closed Oct 3, 2025

Bug Description
there was an issue with claude code in previous session, not this one.
Caused Claude Code to totally stop.

 API Error: 400 {"type":"error","error":{"type":"invalid_request_error","me
    ssage":"messages.40: tool_use ids were found without tool_result
    blocks immediately after: toolu_011kEmajbSuwHpQq9pDfVPsH,
    toolu_01Cft8uUv4sHVwZDu2Bsgrvw, toolu_01FfP9B9dUtGrMpSsJzvhmD5,
    toolu_01FwuaEj4uNzVezH9vMshRJi. Each tool_use block must have a
    corresponding tool_result block in the next
    message."},"request_id":"req_011CTdPELNN3vsieWLZ3tNBo"}

Environment Info

  • Platform: darwin
  • Terminal: tmux
  • Version: 2.0.0
  • Feedback ID: 33d2e9f2-a9ba-42a2-af32-d21d64151451

Errors

[{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at ZK (file:///Users/jake.cukjati/.nvm/versions/node/v24.3.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:1183)\n    at file:///Users/jake.cukjati/.nvm/versions/node/v24.3.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:911\n    at Array.map (<anonymous>)\n    at vX (file:///Users/jake.cukjati/.nvm/versions/node/v24.3.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1741:902)\n    at rJB (file:///Users/jake.cukjati/.nvm/versions/node/v24.3.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:2847:9380)\n    at CC (file:///Users/jake.cukjati/.nvm/versions/node/v24.3.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:34:19415)\n    at Xp (file:///Users/jake.cukjati/.nvm/versions/node/v24.3.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:42814)\n    at I9 (file:///Users/jake.cukjati/.nvm/versions/node/v24.3.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:38355)\n    at Dh (file:///Users/jake.cukjati/.nvm/versions/node/v24.3.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:38283)\n    at TC (file:///Users/jake.cukjati/.nvm/versions/node/v24.3.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:36:38137)","timestamp":"2025-09-29T21:56:25.376Z"}]

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