Grok: 400 unsupported tool field: max_uses -- web search never runs

[AlexanderKugel]

Environment

claude-code-proxy v0.1.34
Claude Code 2.1.220 (VS Code extension and CLI)
Provider: grok, model grok-4.6

Problem

The Grok proxy rejects any tool declaration that carries max_uses. It returns a 400, and the request never reaches xAI. Claude Code puts max_uses on its own WebSearch tool, so every session that declares web search hits this.

---

Example 1 -- a WebSearch tool with a use cap

How to reproduce

curl -s -X POST http://$PROXY_HOST:$PROXY_PORT/v1/messages \
  -H 'content-type: application/json' -H 'authorization: Bearer unused' \
  -d '{"model":"grok-4.6","max_tokens":64,
       "messages":[{"role":"user","content":"hi"}],
       "tools":[{"name":"WebSearch","description":"Search the web","max_uses":6,
                 "input_schema":{"type":"object",
                   "properties":{"query":{"type":"string"}},
                   "required":["query"]}}]}'

Observed

API Error: 400 unsupported tool field: max_uses

The request is rejected. The turn produces no reply.

Expected

The request is accepted and the turn replies normally.