feat(agent): support multiple tool calls

Summary:

Test Plan:

Author: ehhuang

src/llama_stack_client/lib/agents/agent.py

@@ -200,10 +200,13 @@ def create_session(self, session_name: str) -> str:
         self.sessions.append(self.session_id)
         return self.session_id
 
-    def _run_tool(self, tool_calls: List[ToolCall]) -> ToolResponseParam:
-        assert len(tool_calls) == 1, "Only one tool call is supported"
-        tool_call = tool_calls[0]
+    def _run_tool_calls(self, tool_calls: List[ToolCall]) -> List[ToolResponseParam]:
+        responses = []
+        for tool_call in tool_calls:
+            responses.append(self._run_single_tool(tool_call))
+        return responses
 
+    def _run_single_tool(self, tool_call: ToolCall) -> ToolResponseParam:
         # custom client tools
         if tool_call.tool_name in self.client_tools:
             tool = self.client_tools[tool_call.tool_name]
@@ -227,12 +230,11 @@ def _run_tool(self, tool_calls: List[ToolCall]) -> ToolResponseParam:
                 tool_name=tool_call.tool_name,
                 kwargs={**tool_call.arguments, **self.builtin_tools[tool_call.tool_name]},
             )
-            tool_response = ToolResponseParam(
+            return ToolResponseParam(
                 call_id=tool_call.call_id,
                 tool_name=tool_call.tool_name,
                 content=tool_result.content,
             )
-            return tool_response
 
         # cannot find tools
         return ToolResponseParam(
@@ -302,14 +304,14 @@ def _create_turn_streaming(
                         yield chunk
 
                     # run the tools
-                    tool_response = self._run_tool(tool_calls)
+                    tool_responses = self._run_tool_calls(tool_calls)
 
                     # pass it to next iteration
                     turn_response = self.client.agents.turn.resume(
                         agent_id=self.agent_id,
                         session_id=session_id or self.session_id[-1],
                         turn_id=turn_id,
-                        tool_responses=[tool_response],
+                        tool_responses=tool_responses,
                         stream=True,
                     )
                     n_iter += 1
@@ -439,10 +441,13 @@ async def create_turn(
                 raise Exception("Turn did not complete")
             return chunks[-1].event.payload.turn
 
-    async def _run_tool(self, tool_calls: List[ToolCall]) -> ToolResponseParam:
-        assert len(tool_calls) == 1, "Only one tool call is supported"
-        tool_call = tool_calls[0]
+    async def _run_tool_calls(self, tool_calls: List[ToolCall]) -> List[ToolResponseParam]:
+        responses = []
+        for tool_call in tool_calls:
+            responses.append(await self._run_single_tool(tool_call))
+        return responses
 
+    async def _run_single_tool(self, tool_call: ToolCall) -> ToolResponseParam:
         # custom client tools
         if tool_call.tool_name in self.client_tools:
             tool = self.client_tools[tool_call.tool_name]
@@ -464,12 +469,11 @@ async def _run_tool(self, tool_calls: List[ToolCall]) -> ToolResponseParam:
                 tool_name=tool_call.tool_name,
                 kwargs={**tool_call.arguments, **self.builtin_tools[tool_call.tool_name]},
             )
-            tool_response = ToolResponseParam(
+            return ToolResponseParam(
                 call_id=tool_call.call_id,
                 tool_name=tool_call.tool_name,
                 content=tool_result.content,
             )
-            return tool_response
 
         # cannot find tools
         return ToolResponseParam(
@@ -522,14 +526,14 @@ async def _create_turn_streaming(
                         yield chunk
 
                     # run the tools
-                    tool_response = await self._run_tool(tool_calls)
+                    tool_responses = await self._run_tool_calls(tool_calls)
 
                     # pass it to next iteration
                     turn_response = await self.client.agents.turn.resume(
                         agent_id=self.agent_id,
                         session_id=session_id or self.session_id[-1],
                         turn_id=turn_id,
-                        tool_responses=[tool_response],
+                        tool_responses=tool_responses,
                         stream=True,
                     )
                     n_iter += 1