Implement parallel tool calling by using LangGraph's prebuilt ToolNode, which automatically executes multiple tool calls in parallel when the LLM returns multiple tool_calls in a single response, without requiring any special configuration.
LangGraph's prebuilt ToolNode handles parallel tool calling automatically. When the LLM returns multiple tool_calls in a single response, ToolNode executes all of them concurrently. The official LangGraph documentation confirms that ToolNode will execute tools in parallel and handle the responses, eliminating the need for manual coordination[citation:1]. This is critical for scenarios where a user asks for multiple unrelated pieces of information (e.g., "What's the weather in New York and the time in London?"), allowing the agent to fetch both answers simultaneously instead of sequentially[citation:10].