Skip to content

[Bug] Anthropic API Error: Missing Tool Result Block #6539

@vanglian

Description

@vanglian

Bug Description
API Error: 400
{"type":"error","error":{"type":"invalid_request_error","message":"messages.16: tool_use
ids were found without tool_result blocks immediately after:
toolu_01BoYHLosBMF2BmMz6vJCE5Y, toolu_01CGkbsYV7UDHdikKeKKk15F. Each tool_use block must
have a corresponding tool_result block in the next
message."},"request_id":"req_011CSUzkDDuokhPkC7Aq9WMg"}

Environment Info

  • Platform: darwin
  • Terminal: vscode
  • Version: 1.0.90
  • Feedback ID: d1fb79a9-4495-4563-9c69-f0d9556df628

Errors

[{"error":"Error: Request was aborted.\n    at HP.makeRequest (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:943:3840)\n    at processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at runNextTicks (node:internal/process/task_queues:69:3)\n    at process.processTimers (node:internal/timers:520:9)","timestamp":"2025-08-25T19:15:45.925Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.16: `tool_use` ids were found without `tool_result` blocks immediately after: toolu_01BoYHLosBMF2BmMz6vJCE5Y, toolu_01CGkbsYV7UDHdikKeKKk15F. Each `tool_use` block must have a corresponding `tool_result` block in the next message.\"},\"request_id\":\"req_011CSUyw5N5JnfymGCaqwmS9\"}\n    at b4.generate (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:926:2412)\n    at HP.makeStatusError (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:943:2101)\n    at HP.makeRequest (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:943:5314)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async qZ1.showErrors (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:27491)\n    at async qZ1 (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:16486)\n    at async qBB (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:27321)\n    at async file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:22275\n    at async XD0 (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:3656)\n    at async Ee (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:22245)","timestamp":"2025-08-25T19:30:13.453Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.16: `tool_use` ids were found without `tool_result` blocks immediately after: toolu_01BoYHLosBMF2BmMz6vJCE5Y, toolu_01CGkbsYV7UDHdikKeKKk15F. Each `tool_use` block must have a corresponding `tool_result` block in the next message.\"},\"request_id\":\"req_011CSUyxVuEDHMJ87WLDh1oV\"}\n    at b4.generate (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:926:2412)\n    at HP.makeStatusError (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:943:2101)\n    at HP.makeRequest (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:943:5314)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async qZ1.showErrors (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:27491)\n    at async qZ1 (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:16486)\n    at async qBB (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:27321)\n    at async file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:22275\n    at async XD0 (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:3656)\n    at async Ee (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1898:22245)","timestamp":"2025-08-25T19:30:35.551Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.16: `tool_use` ids were found without `tool_result` blocks immediately after: toolu_01BoYHLosBMF2BmMz6vJCE5Y, toolu_01CGkbsYV7UDHdikKeKKk15F. Each `tool_use` block must have a corresponding `tool_result` block in the next message.\"},\"request_id\":\"req_011CSUzSX4hpTCLFo7wUy4jY\"}\n    at b4.generate (file:///Users/vanglian/.nvm/versions/node/v22.18.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:926:2412)\n    at HP.makeStatusError (file:///Users/vanglian/.nvm/versions/node/v22.

Note: Error logs were truncated.

Metadata

Metadata

Assignees

No one assigned

    Labels

    area:apiarea:toolsbugSomething isn't workinghas reproHas detailed reproduction stepsplatform:macosIssue specifically occurs on macOS

    Type

    No type
    No fields configured for issues without a type.

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions