Two bugs in convertTools() caused Gemini's OpenAI-compatible endpoint
to reject tool schemas with 400 "schema requires unspecified property":
1. The Agent tool patch unconditionally pushed 'message' into required[]
even though 'message' is not a property of the Agent schema. Gemini
strictly validates that every key in required[] exists in properties.
2. normalizeSchemaForOpenAI() added all property keys to required[] for
OpenAI strict mode, but this conflicts with Gemini's stricter schema
validation which rejects required keys absent from properties.
Fix:
- Agent tool patch now only adds a key to required[] if it exists in
schema.properties (fixes the 'message' 400 error on Gemini)
- normalizeSchemaForOpenAI() accepts a strict flag: true for OpenAI
(promotes all property keys into required[]), false for Gemini
(filters required[] to only keys present in properties)
- convertTools() detects CLAUDE_CODE_USE_GEMINI and passes strict=false
Fixes#82
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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