[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"}]This issue has 3 comments on GitHub. Read the full discussion on GitHub ↗