diff --git a/agentflow/core/graph/agent_internal/execution.py b/agentflow/core/graph/agent_internal/execution.py
index 2c71c8a..4e82647 100644
--- a/agentflow/core/graph/agent_internal/execution.py
+++ b/agentflow/core/graph/agent_internal/execution.py
@@ -328,15 +328,14 @@ async def execute(
 
         is_stream = config.get("is_stream", False)
 
-        if state.context and state.context[-1].role == "tool":
-            response = await self._call_llm_with_retry(messages=messages, stream=is_stream)
-        else:
-            tools = await self._resolve_tools(container)
-            response = await self._call_llm_with_retry(
-                messages=messages,
-                tools=tools if tools else None,
-                stream=is_stream,
-            )
+        # Always resolve tools - even after tool results, the model may want to call
+        # additional tools (e.g., Gemini 2.5+ with sequential tool calls)
+        tools = await self._resolve_tools(container)
+        response = await self._call_llm_with_retry(
+            messages=messages,
+            tools=tools if tools else None,
+            stream=is_stream,
+        )
 
         converter_key = self._get_converter_key()
         return ModelResponseConverter(response, converter=converter_key)
diff --git a/agentflow/runtime/protocols/a2a/_optional.py b/agentflow/runtime/protocols/a2a/_optional.py
index 59784cf..b624117 100644
--- a/agentflow/runtime/protocols/a2a/_optional.py
+++ b/agentflow/runtime/protocols/a2a/_optional.py
@@ -8,8 +8,7 @@
 
 
 A2A_EXTRA_INSTALL_HINT = (
-    "Install it with 'pip install 10xscale-agentflow[a2a_sdk]' "
-    "or 'pip install a2a-sdk'."
+    "Install it with 'pip install 10xscale-agentflow[a2a_sdk]' " "or 'pip install a2a-sdk'."
 )