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* @license
* Copyright 2026 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { createMcpDeclarativeTools } from './mcpToolWrapper.js';
import type { BrowserManager, McpToolCallResult } from './browserManager.js';
import type { MessageBus } from '../../confirmation-bus/message-bus.js';
import type { Tool as McpTool } from '@modelcontextprotocol/sdk/types.js';
describe('mcpToolWrapper', () => {
let mockBrowserManager: BrowserManager;
let mockMessageBus: MessageBus;
let mockMcpTools: McpTool[];
beforeEach(() => {
vi.resetAllMocks();
// Setup mock MCP tools discovered from server
mockMcpTools = [
{
name: 'take_snapshot',
description: 'Take a snapshot of the page accessibility tree',
inputSchema: {
type: 'object',
properties: {
verbose: { type: 'boolean', description: 'Include details' },
},
},
},
{
name: 'click',
description: 'Click on an element by uid',
inputSchema: {
type: 'object',
properties: {
uid: { type: 'string', description: 'Element uid' },
},
required: ['uid'],
},
},
];
// Setup mock browser manager
mockBrowserManager = {
getDiscoveredTools: vi.fn().mockResolvedValue(mockMcpTools),
callTool: vi.fn().mockResolvedValue({
content: [{ type: 'text', text: 'Tool result' }],
} as McpToolCallResult),
} as unknown as BrowserManager;
// Setup mock message bus
mockMessageBus = {
publish: vi.fn().mockResolvedValue(undefined),
subscribe: vi.fn(),
unsubscribe: vi.fn(),
} as unknown as MessageBus;
});
afterEach(() => {
vi.restoreAllMocks();
});
describe('createMcpDeclarativeTools', () => {
it('should create declarative tools from discovered MCP tools', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
);
expect(tools).toHaveLength(2);
expect(tools[0].name).toBe('take_snapshot');
expect(tools[1].name).toBe('click');
});
it('should return tools with correct description', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
);
// Descriptions include augmented hints, so we check they contain the original
expect(tools[0].description).toContain(
'Take a snapshot of the page accessibility tree',
);
expect(tools[1].description).toContain('Click on an element by uid');
});
it('should return tools with proper FunctionDeclaration schema', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
);
const schema = tools[0].schema;
expect(schema.name).toBe('take_snapshot');
expect(schema.parametersJsonSchema).toBeDefined();
});
});
describe('McpDeclarativeTool.build', () => {
it('should create invocation that can be executed', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
);
const invocation = tools[0].build({ verbose: true });
expect(invocation).toBeDefined();
expect(invocation.params).toEqual({ verbose: true });
});
it('should return invocation with correct description', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
);
const invocation = tools[0].build({});
expect(invocation.getDescription()).toContain('take_snapshot');
});
});
describe('McpToolInvocation.execute', () => {
it('should call browserManager.callTool with correct params', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
);
const invocation = tools[1].build({ uid: 'elem-123' });
await invocation.execute({ abortSignal: new AbortController().signal });
expect(mockBrowserManager.callTool).toHaveBeenCalledWith(
'click',
{
uid: 'elem-123',
},
expect.any(AbortSignal),
);
});
it('should return success result from MCP tool', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
);
const invocation = tools[0].build({ verbose: true });
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
expect(result.llmContent).toBe('Tool result');
expect(result.error).toBeUndefined();
});
it('should handle MCP tool errors', async () => {
vi.mocked(mockBrowserManager.callTool).mockResolvedValue({
content: [{ type: 'text', text: 'Element not found' }],
isError: true,
} as McpToolCallResult);
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
);
const invocation = tools[1].build({ uid: 'invalid' });
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
expect(result.error).toBeDefined();
expect(result.error?.message).toBe('Element not found');
});
it('should handle exceptions during tool call', async () => {
vi.mocked(mockBrowserManager.callTool).mockRejectedValue(
new Error('Connection lost'),
);
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
);
const invocation = tools[0].build({});
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
expect(result.error).toBeDefined();
expect(result.error?.message).toBe('Connection lost');
});
});
describe('Input blocker suspend/resume', () => {
it('should suspend and resume input blocker around click (interactive tool)', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
true, // shouldDisableInput
);
const clickTool = tools.find((t) => t.name === 'click')!;
const invocation = clickTool.build({ uid: 'elem-42' });
await invocation.execute({ abortSignal: new AbortController().signal });
// callTool: suspend blocker + click + resume blocker
expect(mockBrowserManager.callTool).toHaveBeenCalledTimes(3);
// First call: suspend blocker (pointer-events: none)
expect(mockBrowserManager.callTool).toHaveBeenNthCalledWith(
1,
'evaluate_script',
expect.objectContaining({
function: expect.stringContaining('__gemini_input_blocker'),
}),
expect.any(AbortSignal),
true,
);
// Second call: click
expect(mockBrowserManager.callTool).toHaveBeenNthCalledWith(
2,
'click',
{ uid: 'elem-42' },
expect.any(AbortSignal),
);
// Third call: resume blocker (pointer-events: auto)
expect(mockBrowserManager.callTool).toHaveBeenNthCalledWith(
3,
'evaluate_script',
expect.objectContaining({
function: expect.stringContaining('__gemini_input_blocker'),
}),
expect.any(AbortSignal),
true,
);
});
it('should NOT suspend/resume for take_snapshot (read-only tool)', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
true, // shouldDisableInput
);
const snapshotTool = tools.find((t) => t.name === 'take_snapshot')!;
const invocation = snapshotTool.build({});
await invocation.execute({ abortSignal: new AbortController().signal });
// callTool should only be called once for take_snapshot — no suspend/resume
expect(mockBrowserManager.callTool).toHaveBeenCalledTimes(1);
expect(mockBrowserManager.callTool).toHaveBeenCalledWith(
'take_snapshot',
{},
expect.any(AbortSignal),
);
});
it('should NOT suspend/resume when shouldDisableInput is false', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false, // shouldDisableInput disabled
);
const clickTool = tools.find((t) => t.name === 'click')!;
const invocation = clickTool.build({ uid: 'elem-42' });
await invocation.execute({ abortSignal: new AbortController().signal });
// callTool should only be called once for click — no suspend/resume
expect(mockBrowserManager.callTool).toHaveBeenCalledTimes(1);
});
it('should resume blocker even when interactive tool fails', async () => {
vi.mocked(mockBrowserManager.callTool)
.mockResolvedValueOnce({ content: [] }) // suspend blocker succeeds
.mockRejectedValueOnce(new Error('Click failed')) // tool fails
.mockResolvedValueOnce({ content: [] }); // resume succeeds
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
true, // shouldDisableInput
);
const clickTool = tools.find((t) => t.name === 'click')!;
const invocation = clickTool.build({ uid: 'bad-elem' });
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
// Should return error, not throw
expect(result.error).toBeDefined();
// Should still try to resume
expect(mockBrowserManager.callTool).toHaveBeenCalledTimes(3);
});
});
describe('Hard Block: upload_file', () => {
beforeEach(() => {
mockMcpTools.push({
name: 'upload_file',
description: 'Upload a file',
inputSchema: {
type: 'object',
properties: { path: { type: 'string' } },
},
});
});
it('should block upload_file when blockFileUploads is true', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
true, // blockFileUploads
);
const uploadTool = tools.find((t) => t.name === 'upload_file')!;
const invocation = uploadTool.build({ path: 'test.txt' });
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
expect(result.error).toBeDefined();
expect(result.llmContent).toContain('File uploads are blocked');
expect(mockBrowserManager.callTool).not.toHaveBeenCalled();
});
it('should NOT block upload_file when blockFileUploads is false', async () => {
const tools = await createMcpDeclarativeTools(
mockBrowserManager,
mockMessageBus,
false,
false, // blockFileUploads
);
const uploadTool = tools.find((t) => t.name === 'upload_file')!;
const invocation = uploadTool.build({ path: 'test.txt' });
const result = await invocation.execute({
abortSignal: new AbortController().signal,
});
expect(result.error).toBeUndefined();
expect(result.llmContent).toBe('Tool result');
expect(mockBrowserManager.callTool).toHaveBeenCalledWith(
'upload_file',
expect.anything(),
expect.anything(),
);
});
});
});
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