@langchain/langgraph-sdk/dist/utils/tools.js

Client library for interacting with the LangGraph API

//#region src/utils/tools.ts
/**
* Extracts tool calls with their results from a list of messages.
*
* @template ToolCall The type of tool calls.
* @param messages The list of messages to extract tool calls from.
* @returns An array of ToolCallWithResult objects.
*
* @example
* ```ts
* const toolCalls = getToolCallsWithResults(messages);
* for (const { call, result } of toolCalls) {
*   if (call.name === "get_weather") {
*     console.log(`Weather for ${call.args.location}:`, result?.content);
*   }
* }
* ```
*/
/**
* Computes the lifecycle state of a tool call based on its result.
*/
function computeToolCallState(result) {
	if (!result) return "pending";
	return result.status === "error" ? "error" : "completed";
}
function getToolCallsWithResults(messages) {
	const results = [];
	const toolResultsById = /* @__PURE__ */ new Map();
	for (const msg of messages) if (msg.type === "tool") toolResultsById.set(msg.tool_call_id, msg);
	for (const msg of messages) if (msg.type === "ai" && msg.tool_calls && msg.tool_calls.length > 0) {
		const aiMessage = msg;
		for (let i = 0; i < aiMessage.tool_calls.length; i += 1) {
			const call = aiMessage.tool_calls[i];
			const callId = call.id;
			const result = callId ? toolResultsById.get(callId) : void 0;
			results.push({
				id: callId ?? `${aiMessage.id ?? "unknown"}-${i}`,
				call,
				result,
				aiMessage,
				index: i,
				state: computeToolCallState(result)
			});
		}
	}
	return results;
}

//#endregion
export { getToolCallsWithResults };
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