[MODEL]

Preflight Checklist

• [x] I have searched existing issues for similar behavior reports
• [x] This report does NOT contain sensitive information (API keys, passwords, etc.)

Type of Behavior Issue

Other unexpected behavior

What You Asked Claude to Do

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.25.custom.input_schema: JSON schema is invalid. It must match JSON Schema draft 2020-12 (https://json-schema.org/draft/2020-12). Learn more about tool use at
https://docs.claude.com/en/docs/tool-use."},"request_id":"req_011CTmgYDPSQCGSzwxUHAjod"}

What Claude Actually Did

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.25.custom.input_schema: JSON schema is invalid. It must match JSON Schema draft 2020-12 (https://json-schema.org/draft/2020-12). Learn more about tool use at
https://docs.claude.com/en/docs/tool-use."},"request_id":"req_011CTmgYDPSQCGSzwxUHAjod"}

Expected Behavior

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.25.custom.input_schema: JSON schema is invalid. It must match JSON Schema draft 2020-12 (https://json-schema.org/draft/2020-12). Learn more about tool use at
https://docs.claude.com/en/docs/tool-use."},"request_id":"req_011CTmgYDPSQCGSzwxUHAjod"}

Files Affected

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Yes, every time with the same prompt

Steps to Reproduce

_No response_

Claude Model

Sonnet

Relevant Conversation

Impact

Critical - Data loss or corrupted project

Claude Code Version

Claude Code v2.0.1

Platform

Anthropic API

Additional Context

_No response_