fix(Gemini): update ToolCallRequest and OpenAICompatProvider to handle thought signatures in extra_content

nanobot/providers/base.py

@@ -30,7 +30,21 @@ class ToolCallRequest:
             },
         }
         if self.provider_specific_fields:
-            tool_call["provider_specific_fields"] = self.provider_specific_fields
+            # Gemini OpenAI compatibility expects thought signatures in extra_content.google.
+            if "thought_signature" in self.provider_specific_fields:
+                tool_call["extra_content"] = {
+                    "google": {
+                        "thought_signature": self.provider_specific_fields["thought_signature"],
+                    }
+                }
+                other_fields = {
+                    k: v for k, v in self.provider_specific_fields.items()
+                    if k != "thought_signature"
+                }
+                if other_fields:
+                    tool_call["provider_specific_fields"] = other_fields
+            else:
+                tool_call["provider_specific_fields"] = self.provider_specific_fields
         if self.function_provider_specific_fields:
             tool_call["function"]["provider_specific_fields"] = self.function_provider_specific_fields
         return tool_call

nanobot/providers/openai_compat_provider.py

@@ -43,6 +43,13 @@ def _coerce_dict(value: Any) -> dict[str, Any] | None:
 def _extract_tool_call_fields(tc: Any) -> tuple[dict[str, Any] | None, dict[str, Any] | None]:
     """Extract provider-specific metadata from a tool call object."""
     provider_specific_fields = _coerce_dict(_get_attr_or_item(tc, "provider_specific_fields"))
+    extra_content = _coerce_dict(_get_attr_or_item(tc, "extra_content"))
+    google_content = _coerce_dict(_get_attr_or_item(extra_content, "google")) if extra_content else None
+    if google_content:
+        provider_specific_fields = {
+            **(provider_specific_fields or {}),
+            **google_content,
+        }
     function = _get_attr_or_item(tc, "function")
     function_provider_specific_fields = _coerce_dict(
         _get_attr_or_item(function, "provider_specific_fields")