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refactor: move server to a separate file #1043

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Merged
OrKoN merged 1 commit into from
Feb 26, 2026
Merged

refactor: move server to a separate file #1043

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2 changes: 1 addition & 1 deletion package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
"description": "MCP server for Chrome DevTools",
"type": "module",
"bin": "./build/src/index.js",
"main": "index.js",
"main": "./build/src/server.js",
"scripts": {
"clean": "node -e \"require('fs').rmSync('build', {recursive: true, force: true})\"",
"bundle": "npm run clean && npm run build && rollup -c rollup.config.mjs && node -e \"require('fs').rmSync('build/node_modules', {recursive: true, force: true})\"",
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213 changes: 5 additions & 208 deletions src/main.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -8,27 +8,11 @@ import './polyfill.js';

import process from 'node:process';

import type {Channel} from './browser.js';
import {ensureBrowserConnected, ensureBrowserLaunched} from './browser.js';
import {cliOptions, parseArguments} from './cli.js';
import {loadIssueDescriptions} from './issue-descriptions.js';
import {logger, saveLogsToFile} from './logger.js';
import {McpContext} from './McpContext.js';
import {McpResponse} from './McpResponse.js';
import {Mutex} from './Mutex.js';
import {SlimMcpResponse} from './SlimMcpResponse.js';
import {ClearcutLogger} from './telemetry/ClearcutLogger.js';
import {createMcpServer} from './server.js';
import {computeFlagUsage} from './telemetry/flagUtils.js';
import {bucketizeLatency} from './telemetry/metricUtils.js';
import {
McpServer,
StdioServerTransport,
type CallToolResult,
SetLevelRequestSchema,
} from './third_party/index.js';
import {ToolCategory} from './tools/categories.js';
import type {ToolDefinition} from './tools/ToolDefinition.js';
import {createTools} from './tools/tools.js';
import {StdioServerTransport} from './third_party/index.js';
import {VERSION} from './version.js';

export const args = parseArguments(VERSION);
Expand All @@ -44,81 +28,13 @@ if (
args.usageStatistics = false;
}

let clearcutLogger: ClearcutLogger | undefined;
if (args.usageStatistics) {
clearcutLogger = new ClearcutLogger({
logFile: args.logFile,
appVersion: VERSION,
clearcutEndpoint: args.clearcutEndpoint,
clearcutForceFlushIntervalMs: args.clearcutForceFlushIntervalMs,
clearcutIncludePidHeader: args.clearcutIncludePidHeader,
});
}

if (process.env['CHROME_DEVTOOLS_MCP_CRASH_ON_UNCAUGHT'] !== 'true') {
process.on('unhandledRejection', (reason, promise) => {
logger('Unhandled promise rejection', promise, reason);
});
}

logger(`Starting Chrome DevTools MCP Server v${VERSION}`);
const server = new McpServer(
{
name: 'chrome_devtools',
title: 'Chrome DevTools MCP server',
version: VERSION,
},
{capabilities: {logging: {}}},
);
server.server.setRequestHandler(SetLevelRequestSchema, () => {
return {};
});

let context: McpContext;
async function getContext(): Promise<McpContext> {
const chromeArgs: string[] = (args.chromeArg ?? []).map(String);
const ignoreDefaultChromeArgs: string[] = (
args.ignoreDefaultChromeArg ?? []
).map(String);
if (args.proxyServer) {
chromeArgs.push(`--proxy-server=${args.proxyServer}`);
}
const devtools = args.experimentalDevtools ?? false;
const browser =
args.browserUrl || args.wsEndpoint || args.autoConnect
? await ensureBrowserConnected({
browserURL: args.browserUrl,
wsEndpoint: args.wsEndpoint,
wsHeaders: args.wsHeaders,
// Important: only pass channel, if autoConnect is true.
channel: args.autoConnect ? (args.channel as Channel) : undefined,
userDataDir: args.userDataDir,
devtools,
})
: await ensureBrowserLaunched({
headless: args.headless,
executablePath: args.executablePath,
channel: args.channel as Channel,
isolated: args.isolated ?? false,
userDataDir: args.userDataDir,
logFile,
viewport: args.viewport,
chromeArgs,
ignoreDefaultChromeArgs,
acceptInsecureCerts: args.acceptInsecureCerts,
devtools,
enableExtensions: args.categoryExtensions,
});

if (context?.browser !== browser) {
context = await McpContext.from(browser, logger, {
experimentalDevToolsDebugging: devtools,
experimentalIncludeAllPages: args.experimentalIncludeAllPages,
performanceCrux: args.performanceCrux,
});
}
return context;
}

const logDisclaimers = () => {
console.error(
Expand All @@ -142,128 +58,9 @@ For more details, visit: https://github.com/ChromeDevTools/chrome-devtools-mcp#u
}
};

const toolMutex = new Mutex();

function registerTool(tool: ToolDefinition): void {
if (
tool.annotations.category === ToolCategory.EMULATION &&
args.categoryEmulation === false
) {
return;
}
if (
tool.annotations.category === ToolCategory.PERFORMANCE &&
args.categoryPerformance === false
) {
return;
}
if (
tool.annotations.category === ToolCategory.NETWORK &&
args.categoryNetwork === false
) {
return;
}
if (
tool.annotations.category === ToolCategory.EXTENSIONS &&
args.categoryExtensions === false
) {
return;
}
if (
tool.annotations.conditions?.includes('computerVision') &&
!args.experimentalVision
) {
return;
}
if (
tool.annotations.conditions?.includes('experimentalInteropTools') &&
!args.experimentalInteropTools
) {
return;
}
if (
tool.annotations.conditions?.includes('screencast') &&
!args.experimentalScreencast
) {
return;
}
server.registerTool(
tool.name,
{
description: tool.description,
inputSchema: tool.schema,
annotations: tool.annotations,
},
async (params): Promise<CallToolResult> => {
const guard = await toolMutex.acquire();
const startTime = Date.now();
let success = false;
try {
logger(`${tool.name} request: ${JSON.stringify(params, null, ' ')}`);
const context = await getContext();
logger(`${tool.name} context: resolved`);
await context.detectOpenDevToolsWindows();
const response = args.slim
? new SlimMcpResponse(args)
: new McpResponse(args);

await tool.handler(
{
params,
},
response,
context,
);
const {content, structuredContent} = await response.handle(
tool.name,
context,
);
const result: CallToolResult & {
structuredContent?: Record<string, unknown>;
} = {
content,
};
success = true;
if (args.experimentalStructuredContent) {
result.structuredContent = structuredContent as Record<
string,
unknown
>;
}
return result;
} catch (err) {
logger(`${tool.name} error:`, err, err?.stack);
let errorText = err && 'message' in err ? err.message : String(err);
if ('cause' in err && err.cause) {
errorText += `\nCause: ${err.cause.message}`;
}
return {
content: [
{
type: 'text',
text: errorText,
},
],
isError: true,
};
} finally {
void clearcutLogger?.logToolInvocation({
toolName: tool.name,
success,
latencyMs: bucketizeLatency(Date.now() - startTime),
});
guard.dispose();
}
},
);
}

const tools = createTools(args);
for (const tool of tools) {
registerTool(tool);
}

await loadIssueDescriptions();
const {server, clearcutLogger} = await createMcpServer(args, {
logFile,
});
const transport = new StdioServerTransport();
await server.connect(transport);
logger('Chrome DevTools MCP Server connected');
Expand Down
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