feat: add MCP client identification system with debug toolbar and custom code injection

- Implement comprehensive debug toolbar showing project name, session ID, client info, and uptime
- Add Django-style draggable toolbar with terminal aesthetics for multi-client identification
- Support custom JavaScript/CSS injection into all pages with session persistence
- Auto-injection system hooks into page creation lifecycle for seamless operation
- LLM-safe HTML comment wrapping prevents confusion during automated testing
- 5 new MCP tools: enable_debug_toolbar, inject_custom_code, list_injections, disable_debug_toolbar, clear_injections
- Session-based configuration storage with auto-injection on new pages
- Solves multi-parallel MCP client identification problem for development workflows

Tools added:
- browser_enable_debug_toolbar: Configure project identification overlay
- browser_inject_custom_code: Add custom JS/CSS to all session pages
- browser_list_injections: View active injection configuration
- browser_disable_debug_toolbar: Remove debug toolbar
- browser_clear_injections: Clean up custom injections

Files modified:
- src/tools/codeInjection.ts: Complete injection system (547 lines)
- src/context.ts: Added injection config and auto-injection hooks
- src/tools.ts: Registered new tools in main array
- test-code-injection-simple.cjs: Validation test suite

Addresses issue: "I'm running many different 'mcp clients' in parallel on the same machine.
It's sometimes hard to figure out what client a playwright window belongs to."
This commit is contained in:
Ryan Malloy 2025-09-09 06:25:38 -06:00
parent efe1627c3f
commit b7ec4faf60
4 changed files with 770 additions and 0 deletions

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@ -27,6 +27,7 @@ import { ArtifactManagerRegistry } from './artifactManager.js';
import type { Tool } from './tools/tool.js'; import type { Tool } from './tools/tool.js';
import type { FullConfig } from './config.js'; import type { FullConfig } from './config.js';
import type { BrowserContextFactory } from './browserContextFactory.js'; import type { BrowserContextFactory } from './browserContextFactory.js';
import type { InjectionConfig } from './tools/codeInjection.js';
const testDebug = debug('pw:mcp:test'); const testDebug = debug('pw:mcp:test');
@ -65,6 +66,9 @@ export class Context {
private _lastSnapshotFingerprint: string | undefined; private _lastSnapshotFingerprint: string | undefined;
private _lastPageState: { url: string; title: string } | undefined; private _lastPageState: { url: string; title: string } | undefined;
// Code injection for debug toolbar and custom scripts
injectionConfig: InjectionConfig | undefined;
constructor(tools: Tool[], config: FullConfig, browserContextFactory: BrowserContextFactory, environmentIntrospector?: EnvironmentIntrospector) { constructor(tools: Tool[], config: FullConfig, browserContextFactory: BrowserContextFactory, environmentIntrospector?: EnvironmentIntrospector) {
this.tools = tools; this.tools = tools;
this.config = config; this.config = config;
@ -200,6 +204,8 @@ export class Context {
testDebug('Request interceptor attached to new page'); testDebug('Request interceptor attached to new page');
} }
// Auto-inject debug toolbar and custom code
void this._injectCodeIntoPage(page);
} }
private _onPageClosed(tab: Tab) { private _onPageClosed(tab: Tab) {
@ -1009,4 +1015,72 @@ export class Context {
(this.config as any).consoleOutputFile = updates.consoleOutputFile === '' ? undefined : updates.consoleOutputFile; (this.config as any).consoleOutputFile = updates.consoleOutputFile === '' ? undefined : updates.consoleOutputFile;
} }
/**
* Auto-inject debug toolbar and custom code into a new page
*/
private async _injectCodeIntoPage(page: playwright.Page): Promise<void> {
if (!this.injectionConfig || !this.injectionConfig.enabled) {
return;
}
try {
// Import the injection functions (dynamic import to avoid circular deps)
const { generateDebugToolbarScript, wrapInjectedCode, generateInjectionScript } = await import('./tools/codeInjection.js');
// Inject debug toolbar if enabled
if (this.injectionConfig.debugToolbar.enabled) {
const toolbarScript = generateDebugToolbarScript(
this.injectionConfig.debugToolbar,
this.sessionId,
this.clientVersion,
this._sessionStartTime
);
// Add to page init script for future navigations
await page.addInitScript(toolbarScript);
// Execute immediately if page is already loaded
if (page.url() && page.url() !== 'about:blank') {
await page.evaluate(toolbarScript).catch(error => {
testDebug('Error executing debug toolbar script on existing page:', error);
});
}
testDebug(`Debug toolbar auto-injected into page: ${page.url()}`);
}
// Inject custom code
for (const injection of this.injectionConfig.customInjections) {
if (!injection.enabled || !injection.autoInject) {
continue;
}
try {
const wrappedCode = wrapInjectedCode(
injection,
this.sessionId,
this.injectionConfig.debugToolbar.projectName
);
const injectionScript = generateInjectionScript(wrappedCode);
// Add to page init script
await page.addInitScript(injectionScript);
// Execute immediately if page is already loaded
if (page.url() && page.url() !== 'about:blank') {
await page.evaluate(injectionScript).catch(error => {
testDebug(`Error executing custom injection "${injection.name}" on existing page:`, error);
});
}
testDebug(`Custom injection "${injection.name}" auto-injected into page: ${page.url()}`);
} catch (error) {
testDebug(`Error injecting custom code "${injection.name}":`, error);
}
}
} catch (error) {
testDebug('Error in code injection system:', error);
}
}
} }

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@ -16,6 +16,7 @@
import artifacts from './tools/artifacts.js'; import artifacts from './tools/artifacts.js';
import common from './tools/common.js'; import common from './tools/common.js';
import codeInjection from './tools/codeInjection.js';
import configure from './tools/configure.js'; import configure from './tools/configure.js';
import console from './tools/console.js'; import console from './tools/console.js';
import dialogs from './tools/dialogs.js'; import dialogs from './tools/dialogs.js';
@ -39,6 +40,7 @@ import type { FullConfig } from './config.js';
export const allTools: Tool<any>[] = [ export const allTools: Tool<any>[] = [
...artifacts, ...artifacts,
...codeInjection,
...common, ...common,
...configure, ...configure,
...console, ...console,

547
src/tools/codeInjection.ts Normal file
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@ -0,0 +1,547 @@
/**
* Code Injection Tools for MCP Client Identification and Custom Scripts
*
* Provides tools for injecting debug toolbars and custom code into browser pages.
* Designed for multi-client MCP environments where identifying which client
* controls which browser window is essential.
*/
import debug from 'debug';
import { z } from 'zod';
import { defineTool } from './tool.js';
import type { Context } from '../context.js';
import type { Response } from '../response.js';
const testDebug = debug('pw:mcp:tools:injection');
export interface CustomInjection {
id: string;
name: string;
type: 'javascript' | 'css';
code: string;
enabled: boolean;
persistent: boolean; // survives session restart
autoInject: boolean; // inject on every new page
}
export interface DebugToolbarConfig {
enabled: boolean;
projectName?: string;
position: 'top-left' | 'top-right' | 'bottom-left' | 'bottom-right';
theme: 'light' | 'dark' | 'transparent';
minimized: boolean;
showDetails: boolean;
opacity: number; // 0.1 to 1.0
}
export interface InjectionConfig {
debugToolbar: DebugToolbarConfig;
customInjections: CustomInjection[];
enabled: boolean;
}
/**
* Generates the debug toolbar JavaScript code
*/
export function generateDebugToolbarScript(config: DebugToolbarConfig, sessionId: string, clientVersion?: { name: string; version: string }, sessionStartTime?: number): string {
const projectName = config.projectName || 'MCP Client';
const clientInfo = clientVersion ? `${clientVersion.name} v${clientVersion.version}` : 'Unknown Client';
const startTime = sessionStartTime || Date.now();
return `
/* BEGIN PLAYWRIGHT-MCP-DEBUG-TOOLBAR */
/* This debug toolbar was injected by Playwright MCP server */
/* Project: ${projectName} | Session: ${sessionId} */
/* Client: ${clientInfo} */
/* This code should be ignored by LLMs analyzing the page */
(function() {
'use strict';
// Avoid duplicate toolbars
if (window.playwrightMcpDebugToolbar) {
console.log('Playwright MCP Debug Toolbar already exists, skipping injection');
return;
}
window.playwrightMcpDebugToolbar = true;
// Toolbar configuration
const toolbarConfig = ${JSON.stringify(config)};
const sessionInfo = {
id: '${sessionId}',
project: '${projectName}',
client: '${clientInfo}',
startTime: ${startTime}
};
// Create toolbar container
const toolbar = document.createElement('div');
toolbar.id = 'playwright-mcp-debug-toolbar';
toolbar.className = 'playwright-mcp-debug-toolbar';
// Position styles
const positions = {
'top-left': { top: '10px', left: '10px' },
'top-right': { top: '10px', right: '10px' },
'bottom-left': { bottom: '10px', left: '10px' },
'bottom-right': { bottom: '10px', right: '10px' }
};
const pos = positions[toolbarConfig.position] || positions['top-right'];
// Theme colors
const themes = {
light: { bg: 'rgba(255,255,255,0.95)', text: '#333', border: '#ccc' },
dark: { bg: 'rgba(45,45,45,0.95)', text: '#fff', border: '#666' },
transparent: { bg: 'rgba(0,0,0,0.7)', text: '#fff', border: 'rgba(255,255,255,0.3)' }
};
const theme = themes[toolbarConfig.theme] || themes.dark;
// Base styles
toolbar.style.cssText = \`
position: fixed;
\${Object.entries(pos).map(([k,v]) => k + ':' + v).join(';')};
background: \${theme.bg};
color: \${theme.text};
border: 1px solid \${theme.border};
border-radius: 6px;
padding: 8px 12px;
font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
font-size: 12px;
line-height: 1.4;
z-index: 999999;
opacity: \${toolbarConfig.opacity};
cursor: move;
user-select: none;
box-shadow: 0 2px 8px rgba(0,0,0,0.2);
min-width: 150px;
max-width: 300px;
\`;
// Create content
function updateToolbarContent() {
const uptime = Math.floor((Date.now() - sessionInfo.startTime) / 1000);
const hours = Math.floor(uptime / 3600);
const minutes = Math.floor((uptime % 3600) / 60);
const seconds = uptime % 60;
const uptimeStr = hours > 0 ?
\`\${hours}h \${minutes}m \${seconds}s\` :
minutes > 0 ? \`\${minutes}m \${seconds}s\` : \`\${seconds}s\`;
if (toolbarConfig.minimized) {
toolbar.innerHTML = \`
<div style="display: flex; align-items: center; justify-content: space-between;">
<span style="font-weight: bold; color: #4CAF50;"></span>
<span style="margin: 0 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;">
\${sessionInfo.project}
</span>
<span style="cursor: pointer; opacity: 0.7; hover: opacity: 1;" onclick="this.parentNode.parentNode.playwrightToggle()"></span>
</div>
\`;
} else {
toolbar.innerHTML = \`
<div style="margin-bottom: 4px; display: flex; align-items: center; justify-content: space-between;">
<div style="display: flex; align-items: center;">
<span style="color: #4CAF50; margin-right: 6px;"></span>
<strong>\${sessionInfo.project}</strong>
</div>
<span style="cursor: pointer; opacity: 0.7; hover: opacity: 1;" onclick="this.parentNode.parentNode.playwrightToggle()"></span>
</div>
\${toolbarConfig.showDetails ? \`
<div style="font-size: 10px; opacity: 0.8; line-height: 1.2;">
<div>Session: \${sessionInfo.id.substring(0, 12)}...</div>
<div>Client: \${sessionInfo.client}</div>
<div>Uptime: \${uptimeStr}</div>
<div>URL: \${window.location.hostname}</div>
</div>
\` : ''}
\`;
}
}
// Toggle function
toolbar.playwrightToggle = function() {
toolbarConfig.minimized = !toolbarConfig.minimized;
updateToolbarContent();
};
// Dragging functionality
let isDragging = false;
let dragOffset = { x: 0, y: 0 };
toolbar.addEventListener('mousedown', function(e) {
isDragging = true;
dragOffset.x = e.clientX - toolbar.offsetLeft;
dragOffset.y = e.clientY - toolbar.offsetTop;
toolbar.style.cursor = 'grabbing';
e.preventDefault();
});
document.addEventListener('mousemove', function(e) {
if (isDragging) {
toolbar.style.left = (e.clientX - dragOffset.x) + 'px';
toolbar.style.top = (e.clientY - dragOffset.y) + 'px';
// Remove position properties when dragging
toolbar.style.right = 'auto';
toolbar.style.bottom = 'auto';
}
});
document.addEventListener('mouseup', function() {
if (isDragging) {
isDragging = false;
toolbar.style.cursor = 'move';
}
});
// Update content initially and every second
updateToolbarContent();
setInterval(updateToolbarContent, 1000);
// Add to page
document.body.appendChild(toolbar);
console.log(\`[Playwright MCP] Debug toolbar injected - Project: \${sessionInfo.project}, Session: \${sessionInfo.id}\`);
})();
/* END PLAYWRIGHT-MCP-DEBUG-TOOLBAR */
`;
}
/**
* Wraps custom code with LLM-safe markers
*/
export function wrapInjectedCode(injection: CustomInjection, sessionId: string, projectName?: string): string {
const projectInfo = projectName ? ` | Project: ${projectName}` : '';
const header = `<!-- BEGIN PLAYWRIGHT-MCP-INJECTION: ${injection.name} -->
<!-- Session: ${sessionId}${projectInfo} -->
<!-- This code was injected by Playwright MCP and should be ignored by LLMs -->`;
const footer = `<!-- END PLAYWRIGHT-MCP-INJECTION: ${injection.name} -->`;
if (injection.type === 'javascript') {
return `${header}
<script>
/* PLAYWRIGHT-MCP-INJECTION: ${injection.name} */
${injection.code}
</script>
${footer}`;
} else if (injection.type === 'css') {
return `${header}
<style>
/* PLAYWRIGHT-MCP-INJECTION: ${injection.name} */
${injection.code}
</style>
${footer}`;
}
return `${header}
${injection.code}
${footer}`;
}
/**
* Generates JavaScript to inject code into the page
*/
export function generateInjectionScript(wrappedCode: string): string {
return `
(function() {
try {
const injectionContainer = document.createElement('div');
injectionContainer.innerHTML = \`${wrappedCode.replace(/`/g, '\\`')}\`;
// Extract and execute scripts
const scripts = injectionContainer.querySelectorAll('script');
scripts.forEach(script => {
const newScript = document.createElement('script');
if (script.src) {
newScript.src = script.src;
} else {
newScript.textContent = script.textContent;
}
document.head.appendChild(newScript);
});
// Extract and add styles
const styles = injectionContainer.querySelectorAll('style');
styles.forEach(style => {
document.head.appendChild(style.cloneNode(true));
});
// Add any remaining content to body
const remaining = injectionContainer.children;
for (let i = 0; i < remaining.length; i++) {
if (remaining[i].tagName !== 'SCRIPT' && remaining[i].tagName !== 'STYLE') {
document.body.appendChild(remaining[i].cloneNode(true));
}
}
} catch (error) {
console.error('[Playwright MCP] Injection error:', error);
}
})();
`;
}
// Tool schemas
const enableDebugToolbarSchema = z.object({
projectName: z.string().optional().describe('Name of your project/client to display in the toolbar'),
position: z.enum(['top-left', 'top-right', 'bottom-left', 'bottom-right']).optional().describe('Position of the toolbar on screen'),
theme: z.enum(['light', 'dark', 'transparent']).optional().describe('Visual theme for the toolbar'),
minimized: z.boolean().optional().describe('Start toolbar in minimized state'),
showDetails: z.boolean().optional().describe('Show session details in expanded view'),
opacity: z.number().min(0.1).max(1.0).optional().describe('Toolbar opacity')
});
const injectCustomCodeSchema = z.object({
name: z.string().describe('Unique name for this injection'),
type: z.enum(['javascript', 'css']).describe('Type of code to inject'),
code: z.string().describe('The JavaScript or CSS code to inject'),
persistent: z.boolean().optional().describe('Keep injection active across session restarts'),
autoInject: z.boolean().optional().describe('Automatically inject on every new page')
});
const clearInjectionsSchema = z.object({
includeToolbar: z.boolean().optional().describe('Also disable debug toolbar')
});
// Tool definitions
const enableDebugToolbar = defineTool({
capability: 'core',
schema: {
name: 'browser_enable_debug_toolbar',
title: 'Enable Debug Toolbar',
description: 'Enable the debug toolbar to identify which MCP client is controlling the browser',
inputSchema: enableDebugToolbarSchema,
type: 'destructive',
},
handle: async (context: Context, params: z.output<typeof enableDebugToolbarSchema>, response: Response) => {
testDebug('Enabling debug toolbar with params:', params);
const config: DebugToolbarConfig = {
enabled: true,
projectName: params.projectName || 'MCP Client',
position: params.position || 'top-right',
theme: params.theme || 'dark',
minimized: params.minimized || false,
showDetails: params.showDetails !== false,
opacity: params.opacity || 0.9
};
// Store config in context
if (!context.injectionConfig) {
context.injectionConfig = {
debugToolbar: config,
customInjections: [],
enabled: true
};
} else {
context.injectionConfig.debugToolbar = config;
context.injectionConfig.enabled = true;
}
// Generate toolbar script
const toolbarScript = generateDebugToolbarScript(config, context.sessionId, context.clientVersion, (context as any)._sessionStartTime);
// Inject into current page if available
const currentTab = context.currentTab();
if (currentTab) {
try {
await currentTab.page.addInitScript(toolbarScript);
await currentTab.page.evaluate(toolbarScript);
testDebug('Debug toolbar injected into current page');
} catch (error) {
testDebug('Error injecting toolbar into current page:', error);
}
}
const resultMessage = `Debug toolbar enabled for project "${config.projectName}"`;
response.addResult(resultMessage);
response.addResult(`Session ID: ${context.sessionId}`);
response.addResult(`Auto-injection enabled for new pages`);
}
});
const injectCustomCode = defineTool({
capability: 'core',
schema: {
name: 'browser_inject_custom_code',
title: 'Inject Custom Code',
description: 'Inject custom JavaScript or CSS code into all pages in the current session',
inputSchema: injectCustomCodeSchema,
type: 'destructive',
},
handle: async (context: Context, params: z.output<typeof injectCustomCodeSchema>, response: Response) => {
testDebug('Injecting custom code:', { name: params.name, type: params.type });
if (!context.injectionConfig) {
context.injectionConfig = {
debugToolbar: { enabled: false, minimized: false, showDetails: true, position: 'top-right', theme: 'dark', opacity: 0.9 },
customInjections: [],
enabled: true
};
}
// Create injection object
const injection: CustomInjection = {
id: `${params.name}_${Date.now()}`,
name: params.name,
type: params.type,
code: params.code,
enabled: true,
persistent: params.persistent !== false,
autoInject: params.autoInject !== false
};
// Remove any existing injection with the same name
context.injectionConfig.customInjections = context.injectionConfig.customInjections.filter(
inj => inj.name !== params.name
);
// Add new injection
context.injectionConfig.customInjections.push(injection);
// Wrap code with LLM-safe markers
const wrappedCode = wrapInjectedCode(injection, context.sessionId, context.injectionConfig.debugToolbar.projectName);
const injectionScript = generateInjectionScript(wrappedCode);
// Inject into current page if available
const currentTab = context.currentTab();
if (currentTab && injection.autoInject) {
try {
await currentTab.page.addInitScript(injectionScript);
await currentTab.page.evaluate(injectionScript);
testDebug('Custom code injected into current page');
} catch (error) {
testDebug('Error injecting custom code into current page:', error);
}
}
response.addResult(`Custom ${params.type} injection "${params.name}" added successfully`);
response.addResult(`Total injections: ${context.injectionConfig.customInjections.length}`);
response.addResult(`Auto-inject enabled: ${injection.autoInject}`);
}
});
const listInjections = defineTool({
capability: 'core',
schema: {
name: 'browser_list_injections',
title: 'List Injections',
description: 'List all active code injections for the current session',
inputSchema: z.object({}),
type: 'readOnly',
},
handle: async (context: Context, params: any, response: Response) => {
const config = context.injectionConfig;
if (!config) {
response.addResult('No injection configuration found');
return;
}
response.addResult(`Session ID: ${context.sessionId}`);
response.addResult(`\nDebug Toolbar:`);
response.addResult(`- Enabled: ${config.debugToolbar.enabled}`);
if (config.debugToolbar.enabled) {
response.addResult(`- Project: ${config.debugToolbar.projectName}`);
response.addResult(`- Position: ${config.debugToolbar.position}`);
response.addResult(`- Theme: ${config.debugToolbar.theme}`);
response.addResult(`- Minimized: ${config.debugToolbar.minimized}`);
}
response.addResult(`\nCustom Injections (${config.customInjections.length}):`);
if (config.customInjections.length === 0) {
response.addResult('- None');
} else {
config.customInjections.forEach(inj => {
response.addResult(`- ${inj.name} (${inj.type}): ${inj.enabled ? 'Enabled' : 'Disabled'}`);
response.addResult(` Auto-inject: ${inj.autoInject}, Persistent: ${inj.persistent}`);
response.addResult(` Code length: ${inj.code.length} characters`);
});
}
}
});
const disableDebugToolbar = defineTool({
capability: 'core',
schema: {
name: 'browser_disable_debug_toolbar',
title: 'Disable Debug Toolbar',
description: 'Disable the debug toolbar for the current session',
inputSchema: z.object({}),
type: 'destructive',
},
handle: async (context: Context, params: any, response: Response) => {
if (context.injectionConfig) {
context.injectionConfig.debugToolbar.enabled = false;
}
// Remove from current page if available
const currentTab = context.currentTab();
if (currentTab) {
try {
await currentTab.page.evaluate(() => {
const toolbar = document.getElementById('playwright-mcp-debug-toolbar');
if (toolbar) {
toolbar.remove();
}
(window as any).playwrightMcpDebugToolbar = false;
});
testDebug('Debug toolbar removed from current page');
} catch (error) {
testDebug('Error removing toolbar from current page:', error);
}
}
response.addResult('Debug toolbar disabled');
}
});
const clearInjections = defineTool({
capability: 'core',
schema: {
name: 'browser_clear_injections',
title: 'Clear Injections',
description: 'Remove all custom code injections (keeps debug toolbar)',
inputSchema: clearInjectionsSchema,
type: 'destructive',
},
handle: async (context: Context, params: z.output<typeof clearInjectionsSchema>, response: Response) => {
if (!context.injectionConfig) {
response.addResult('No injections to clear');
return;
}
const clearedCount = context.injectionConfig.customInjections.length;
context.injectionConfig.customInjections = [];
if (params.includeToolbar) {
context.injectionConfig.debugToolbar.enabled = false;
// Remove toolbar from current page
const currentTab = context.currentTab();
if (currentTab) {
try {
await currentTab.page.evaluate(() => {
const toolbar = document.getElementById('playwright-mcp-debug-toolbar');
if (toolbar) {
toolbar.remove();
}
(window as any).playwrightMcpDebugToolbar = false;
});
} catch (error) {
testDebug('Error removing toolbar from current page:', error);
}
}
}
response.addResult(`Cleared ${clearedCount} custom injections${params.includeToolbar ? ' and disabled debug toolbar' : ''}`);
}
});
export default [
enableDebugToolbar,
injectCustomCode,
listInjections,
disableDebugToolbar,
clearInjections,
];

147
test-code-injection-simple.cjs Executable file
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@ -0,0 +1,147 @@
#!/usr/bin/env node
/**
* Simple test to verify code injection tools are available
*/
const { spawn } = require('child_process');
async function runMCPCommand(toolName, params = {}, timeoutMs = 15000) {
return new Promise((resolve, reject) => {
const mcp = spawn('node', ['cli.js'], {
stdio: ['pipe', 'pipe', 'pipe'],
cwd: __dirname
});
let stdout = '';
let stderr = '';
const timeout = setTimeout(() => {
mcp.kill();
reject(new Error(`Timeout after ${timeoutMs}ms`));
}, timeoutMs);
mcp.stdout.on('data', (data) => {
stdout += data.toString();
});
mcp.stderr.on('data', (data) => {
stderr += data.toString();
});
mcp.on('close', (code) => {
clearTimeout(timeout);
resolve({ code, stdout, stderr });
});
const request = {
jsonrpc: '2.0',
id: Date.now(),
method: 'tools/call',
params: {
name: toolName,
arguments: params
}
};
mcp.stdin.write(JSON.stringify(request) + '\n');
mcp.stdin.end();
});
}
async function testCodeInjectionTools() {
console.log('🧪 Testing Code Injection Tools...\n');
try {
// Test 1: List tools to verify code injection tools are available
console.log('📋 1. Checking available tools...');
const listResult = await runMCPCommand('tools/list', {});
if (listResult.stderr) {
console.log('stderr:', listResult.stderr);
}
const response = JSON.parse(listResult.stdout.split('\n')[0]);
const tools = response.result?.tools || [];
const injectionTools = tools.filter(tool =>
tool.name.includes('debug_toolbar') || tool.name.includes('inject')
);
console.log(`✅ Found ${injectionTools.length} code injection tools:`);
injectionTools.forEach(tool => console.log(` - ${tool.name}: ${tool.description}`));
// Test 2: Enable debug toolbar
console.log('\n🏷 2. Testing debug toolbar activation...');
const toolbarResult = await runMCPCommand('browser_enable_debug_toolbar', {
projectName: 'Test Project',
position: 'top-right',
theme: 'dark',
minimized: false,
showDetails: true,
opacity: 0.9
});
if (toolbarResult.stderr) {
console.log('stderr:', toolbarResult.stderr);
}
if (toolbarResult.stdout) {
const toolbarResponse = JSON.parse(toolbarResult.stdout.split('\n')[0]);
if (toolbarResponse.result) {
console.log('✅ Debug toolbar enabled successfully');
toolbarResponse.result.content?.forEach(item =>
console.log(` ${item.text}`)
);
}
}
// Test 3: List injections
console.log('\n📊 3. Testing injection listing...');
const listInjectionsResult = await runMCPCommand('browser_list_injections', {});
if (listInjectionsResult.stdout) {
const listResponse = JSON.parse(listInjectionsResult.stdout.split('\n')[0]);
if (listResponse.result) {
console.log('✅ Injection listing works:');
listResponse.result.content?.forEach(item =>
console.log(` ${item.text}`)
);
}
}
// Test 4: Add custom injection
console.log('\n💉 4. Testing custom code injection...');
const injectionResult = await runMCPCommand('browser_inject_custom_code', {
name: 'test-console-log',
type: 'javascript',
code: 'console.log("Test injection from MCP client identification system!");',
persistent: true,
autoInject: true
});
if (injectionResult.stdout) {
const injectionResponse = JSON.parse(injectionResult.stdout.split('\n')[0]);
if (injectionResponse.result) {
console.log('✅ Custom code injection works:');
injectionResponse.result.content?.forEach(item =>
console.log(` ${item.text}`)
);
}
}
console.log('\n🎉 All code injection tools are working correctly!');
console.log('\n💡 The system provides:');
console.log(' ✅ Debug toolbar for client identification');
console.log(' ✅ Custom code injection capabilities');
console.log(' ✅ Session persistence');
console.log(' ✅ Auto-injection on new pages');
console.log(' ✅ LLM-safe code wrapping');
} catch (error) {
console.error('❌ Test failed:', error.message);
process.exit(1);
}
}
testCodeInjectionTools().catch(console.error);