[BUG] API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.21.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level"}}

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: <!-- output of claude --version -->
• Operating System: <!-- e.g. macOS 14.3, Windows 11, Ubuntu 22.04 -->
• Terminal: <!-- e.g. iTerm2, Terminal App -->

Bug Description

Any requests results in: " ⎿ API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.21.custom.input_schema:
input_schema does not support oneOf, allOf, or anyOf at the top level"}}
"

Steps to Reproduce

1. Log into Claude Code
2. Send any request

Expected Behavior

Not this

Actual Behavior

⎿ API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"tools.21.custom.input_schema:
input_schema does not support oneOf, allOf, or anyOf at the top level"}}

Additional Context

Claude Code v1.0.83