[Bug] Anthropic API Error: Tool Result Block Missing Corresponding Tool Use Block
Resolved 💬 2 comments Opened Jun 5, 2026 by amElnagdy Closed Jun 9, 2026
Bug Description
API Error: 400 messages.3.content.0: unexpected tool_use_id found in advisor_tool_result blocks: srvtoolu_01Wr57BkH7X8heLDrtN9y9JD. Each
advisor_tool_result block must have a corresponding server_tool_use block before it.
Environment Info
- Platform: darwin
- Terminal: vscode
- Version: 2.1.165
- Feedback ID: af4a57e3-308d-4471-8a62-d3fa3491a693
Errors
[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.3.content.0: unexpected `tool_use_id` found in `advisor_tool_result` blocks: srvtoolu_01Wr57BkH7X8heLDrtN9y9JD. Each `advisor_tool_result` block must have a corresponding `server_tool_use` block before it.\"},\"request_id\":\"req_011CbkhqTaJwBKZwhmp9dqQC\"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:65689)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-06-05T19:58:38.136Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.3.content.0: unexpected `tool_use_id` found in `advisor_tool_result` blocks: srvtoolu_01Wr57BkH7X8heLDrtN9y9JD. Each `advisor_tool_result` block must have a corresponding `server_tool_use` block before it.\"},\"request_id\":\"req_011CbkhtZCjKPtTNudZ1oZ34\"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:65689)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-06-05T19:59:20.166Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.3.content.0: unexpected `tool_use_id` found in `advisor_tool_result` blocks: srvtoolu_01Wr57BkH7X8heLDrtN9y9JD. Each `advisor_tool_result` block must have a corresponding `server_tool_use` block before it.\"},\"request_id\":\"req_011CbkjXUxPPCK6sgxHa5gyJ\"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:65689)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-06-05T20:20:48.006Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.3.content.0: unexpected `tool_use_id` found in `advisor_tool_result` blocks: srvtoolu_01Wr57BkH7X8heLDrtN9y9JD. Each `advisor_tool_result` block must have a corresponding `server_tool_use` block before it.\"},\"request_id\":\"req_011CbkjXigtV2WAv1Uxx1QBA\"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:65689)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-06-05T20:20:51.115Z"}]This issue has 2 comments on GitHub. Read the full discussion on GitHub ↗