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claude-code - 💡(How to fix) Fix [Bug] Malformed MCP Tool Schema Causes Persistent Anthropic API Errors in Subsequent Requests [1 participants]

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anthropics/claude-code#58841•Fetched 2026-05-14 03:38:08
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moorbrookmoorbrook
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Error Message

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/roger/.local/share/claude/versions/2.1.140 (expected in multi-process scenarios)\n at g16 (/$bunfs/root/src/entrypoints/cli.js:2672:2257)\n at RLH (/$bunfs/root/src/entrypoints/cli.js:2672:1337)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-13T22:08:00.981Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.14.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level"},"request_id":"req_011Cb1LAXQoCPNZTSis6j8vz"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:59486)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-13T22:08:53.746Z"},{"error":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.14.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level"},"request_id":"req_011Cb1LBHLzKAS8p4KDDWVpH"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:59486)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-13T22:09:04.094Z"}]

Code Example

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/roger/.local/share/claude/versions/2.1.140 (expected in multi-process scenarios)\n    at g16 (/$bunfs/root/src/entrypoints/cli.js:2672:2257)\n    at RLH (/$bunfs/root/src/entrypoints/cli.js:2672:1337)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-13T22:08:00.981Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"tools.14.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level\"},\"request_id\":\"req_011Cb1LAXQoCPNZTSis6j8vz\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:59486)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-13T22:08:53.746Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"tools.14.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level\"},\"request_id\":\"req_011Cb1LBHLzKAS8p4KDDWVpH\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:59486)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-13T22:09:04.094Z"}]
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Bug Description bad tool schema from MCP can mess up claude. it's "infectious". subsequent conversation calls about other subject return same error.

Environment Info

  • Platform: darwin
  • Terminal: ghostty
  • Version: 2.1.140
  • Feedback ID: 97389ded-ec31-4412-b337-8823d299ac11

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/roger/.local/share/claude/versions/2.1.140 (expected in multi-process scenarios)\n    at g16 (/$bunfs/root/src/entrypoints/cli.js:2672:2257)\n    at RLH (/$bunfs/root/src/entrypoints/cli.js:2672:1337)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-13T22:08:00.981Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"tools.14.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level\"},\"request_id\":\"req_011Cb1LAXQoCPNZTSis6j8vz\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:59486)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-13T22:08:53.746Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"tools.14.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level\"},\"request_id\":\"req_011Cb1LBHLzKAS8p4KDDWVpH\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:59486)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-13T22:09:04.094Z"}]

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#runtime error#dependency conflict#environment setup#docker error#permission error

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