co-mono/packages/ai/test/tool-call-without-result.test.ts

import { type Static, Type } from "@sinclair/typebox";
import { describe, expect, it } from "vitest";
import { getModel } from "../src/models.js";
import { complete } from "../src/stream.js";
import type { Context, Tool } from "../src/types.js";

// Simple calculate tool
const calculateSchema = Type.Object({
	expression: Type.String({ description: "The mathematical expression to evaluate" }),
});

type CalculateParams = Static<typeof calculateSchema>;

const calculateTool: Tool = {
	name: "calculate",
	description: "Evaluate mathematical expressions",
	parameters: calculateSchema,
};

async function testToolCallWithoutResult(model: any, options: any = {}) {
	// Step 1: Create context with the calculate tool
	const context: Context = {
		systemPrompt: "You are a helpful assistant. Use the calculate tool when asked to perform calculations.",
		messages: [],
		tools: [calculateTool],
	};

	// Step 2: Ask the LLM to make a tool call
	context.messages.push({
		role: "user",
		content: "Please calculate 25 * 18 using the calculate tool.",
		timestamp: Date.now(),
	});

	// Step 3: Get the assistant's response (should contain a tool call)
	const firstResponse = await complete(model, context, options);
	context.messages.push(firstResponse);

	console.log("First response:", JSON.stringify(firstResponse, null, 2));

	// Verify the response contains a tool call
	const hasToolCall = firstResponse.content.some((block) => block.type === "toolCall");
	expect(hasToolCall).toBe(true);

	if (!hasToolCall) {
		throw new Error("Expected assistant to make a tool call, but none was found");
	}

	// Step 4: Send a user message WITHOUT providing tool result
	// This simulates the scenario where a tool call was aborted/cancelled
	context.messages.push({
		role: "user",
		content: "Never mind, just tell me what is 2+2?",
		timestamp: Date.now(),
	});

	// Step 5: The fix should filter out the orphaned tool call, and the request should succeed
	const secondResponse = await complete(model, context, options);
	console.log("Second response:", JSON.stringify(secondResponse, null, 2));

	// The request should succeed (not error) - that's the main thing we're testing
	expect(secondResponse.stopReason).not.toBe("error");

	// Should have some content in the response
	expect(secondResponse.content.length).toBeGreaterThan(0);

	// The LLM may choose to answer directly or make a new tool call - either is fine
	// The important thing is it didn't fail with the orphaned tool call error
	const textContent = secondResponse.content
		.filter((block) => block.type === "text")
		.map((block) => (block.type === "text" ? block.text : ""))
		.join(" ");
	expect(textContent.length).toBeGreaterThan(0);
	console.log("Answer:", textContent);

	// Verify the stop reason is either "stop" or "toolUse" (new tool call)
	expect(["stop", "toolUse"]).toContain(secondResponse.stopReason);
}

describe("Tool Call Without Result Tests", () => {
	describe.skipIf(!process.env.ANTHROPIC_API_KEY)("Anthropic Provider - Missing Tool Result", () => {
		const model = getModel("anthropic", "claude-3-5-haiku-20241022");

		it("should filter out tool calls without corresponding tool results", async () => {
			await testToolCallWithoutResult(model);
		}, 30000);
	});

	describe.skipIf(!process.env.MISTRAL_API_KEY)("Mistral Provider - Missing Tool Result", () => {
		const model = getModel("mistral", "devstral-medium-latest");

		it("should filter out tool calls without corresponding tool results", async () => {
			await testToolCallWithoutResult(model);
		}, 30000);
	});
});