use typeguard

Author: subtleGradient

src/lib/tool-orchestrator.ts

@@ -2,6 +2,7 @@ import type * as models from '../models/index.js';
 import type { APITool, Tool, ToolExecutionResult } from './tool-types.js';
 
 import { extractToolCallsFromResponse, responseHasToolCalls } from './stream-transformers.js';
+import { isFunctionCallOutputItem } from './stream-type-guards.js';
 import { executeTool, findToolByName } from './tool-executor.js';
 import { hasExecuteFunction } from './tool-types.js';
 import { buildTurnContext } from './turn-context.js';
@@ -105,7 +106,7 @@ export async function executeToolLoop(
       // Find the raw tool call from the response output
       const rawToolCall = currentResponse.output.find(
         (item): item is models.ResponsesOutputItemFunctionCall =>
-          'type' in item && item.type === 'function_call' && item.callId === toolCall.id
+          isFunctionCallOutputItem(item) && item.callId === toolCall.id,
       );
 
       if (!rawToolCall) {