Error14 reports
Fix BadRequestError
in Anthropic SDK
✅ Solution
BadRequestError in the anthropic-sdk usually arises from sending malformed requests to the Claude API, such as including unexpected or incorrectly formatted data fields like extra headers. To resolve this, carefully inspect your request payload, especially custom headers, output format specifications, and any extra fields, ensuring they strictly adhere to the API's requirements and documented schema; remove any extraneous or incorrect elements that are not explicitly supported.
Related Issues
Real GitHub issues where developers encountered this error:
Extra 'caller' Field in Request Breaks computer-use Between v0.74.1 and v0.75.0Jan 7, 2026
Adding extra_headers for the anthropic web-fetch tool causes the structured_output example to failDec 19, 2025
500/400 server error with complex output_formatDec 7, 2025
0.71.0 breaks uv installationOct 27, 2025
skills.create requires posix pathsOct 27, 2025
Timeline
First reported:Feb 17, 2025
Last reported:Jan 7, 2026
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View Anthropic SDK Changelog