fix: trace tool forwarding decisions

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/main.py

@@ -28,6 +28,7 @@ from .config import Settings, load_settings
 from .http.execution_core import (
     _apply_cached_instance_or_invalidate as _shared_apply_cached_instance_or_invalidate,
     _resolve_ask_mode as _shared_resolve_ask_mode,
+    _tool_config_summary,
     UpstreamExecutionError,
     complete_execution,
     finalize_stream_execution,
@@ -459,6 +460,12 @@ async def v1_chat_completions(req: ChatCompletionsRequest, request: Request):
     #   3. Stick the request to the pool instance that originally served it.
     tool_config = _openai_tool_config(req, settings=settings)
     has_tooling_context = _openai_has_tooling_context(req, messages_dump)
+    logger.info(
+        "chat.request stream=%s tooling=%s tool_config=%s",
+        req.stream,
+        has_tooling_context,
+        _tool_config_summary(tool_config),
+    )
     execution = await prepare_execution_context(
         protocol="chat",
         requested_model=req.model,
@@ -892,6 +899,12 @@ async def v1_messages(req: AnthropicMessagesRequest, request: Request):
         message = error.get("message") or str(detail) or "invalid tool configuration"
         return _anthropic_error(exc.status_code, "invalid_request_error", message)
     has_tooling_context = _anthropic_has_tooling_context(req)
+    logger.info(
+        "anthropic.request stream=%s tooling=%s tool_config=%s",
+        req.stream,
+        has_tooling_context,
+        _tool_config_summary(tool_config),
+    )
     try:
         execution = await prepare_execution_context(
             protocol="anthropic",