chore: add a script to generate CLI

package.json

@@ -6,6 +6,7 @@
   "bin": "./build/src/index.js",
   "main": "./build/src/server.js",
   "scripts": {
+    "cli:generate": "node --experimental-strip-types scripts/generate-cli.ts",
     "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})\" && node --experimental-strip-types scripts/append-lighthouse-notices.ts",
     "build": "tsc && node --experimental-strip-types --no-warnings=ExperimentalWarning scripts/post-build.ts",

scripts/generate-cli.ts

@@ -0,0 +1,175 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import fs from 'node:fs';
+import path from 'node:path';
+
+import {Client} from '@modelcontextprotocol/sdk/client/index.js';
+import {StdioClientTransport} from '@modelcontextprotocol/sdk/client/stdio.js';
+
+import {parseArguments} from '../build/src/cli.js';
+import {labels} from '../build/src/tools/categories.js';
+import {createTools} from '../build/src/tools/tools.js';
+
+const OUTPUT_PATH = path.join(
+  import.meta.dirname,
+  '../src/bin/cliDefinitions.ts',
+);
+
+async function fetchTools() {
+  console.log('Connecting to chrome-devtools-mcp to fetch tools...');
+  // Use the local build of the server
+  const serverPath = path.join(import.meta.dirname, '../build/src/index.js');
+
+  const transport = new StdioClientTransport({
+    command: 'node',
+    args: [serverPath],
+    env: {...process.env, CHROME_DEVTOOLS_MCP_NO_USAGE_STATISTICS: 'true'},
+  });
+
+  const client = new Client(
+    {
+      name: 'chrome-devtools-cli-generator',
+      version: '0.1.0',
+    },
+    {
+      capabilities: {},
+    },
+  );
+
+  await client.connect(transport);
+  try {
+    const toolsResponse = await client.listTools();
+    if (!toolsResponse.tools?.length) {
+      throw new Error(`No tools were fetched`);
+    }
+    const tools = toolsResponse.tools || [];
+    console.log(`Fetched ${tools.length} tools`);
+    return tools;
+  } finally {
+    await client.close();
+  }
+}
+
+interface CliOption {
+  name: string;
+  type: string;
+  description: string;
+  required: boolean;
+  default?: unknown;
+  enum?: unknown[];
+}
+
+interface JsonSchema {
+  type?: string | string[];
+  description?: string;
+  properties?: Record<string, JsonSchema>;
+  required?: string[];
+  default?: unknown;
+  enum?: unknown[];
+}
+
+function schemaToCLIOptions(schema: JsonSchema): CliOption[] {
+  if (!schema || !schema.properties) {
+    return [];
+  }
+  const required = schema.required || [];
+  const properties = schema.properties;
+  return Object.entries(properties).map(([name, prop]) => {
+    const isRequired = required.includes(name);
+    const description = prop.description || '';
+    if (typeof prop.type !== 'string') {
+      throw new Error(
+        `Property ${name} has a complex type not supported by CLI.`,
+      );
+    }
+    return {
+      name,
+      type: prop.type,
+      description,
+      required: isRequired,
+      default: prop.default,
+      enum: prop.enum,
+    };
+  });
+}
+
+async function generateCli() {
+  const tools = await fetchTools();
+  // Sort tools by name
+  const sortedTools = tools.sort((a, b) => a.name.localeCompare(b.name));
+
+  const staticTools = createTools(parseArguments());
+  const toolNameToCategory = new Map<string, string>();
+  for (const tool of staticTools) {
+    toolNameToCategory.set(
+      tool.name,
+      labels[tool.annotations.category as keyof typeof labels],
+    );
+  }
+
+  const commands: Record<
+    string,
+    {description: string; category: string; args: Record<string, CliOption>}
+  > = {};
+
+  for (const tool of sortedTools) {
+    const options = schemaToCLIOptions(tool.inputSchema);
+    const args: Record<string, CliOption> = {};
+    for (const opt of options) {
+      args[opt.name] = opt;
+    }
+    const category = toolNameToCategory.get(tool.name);
+    if (!category) {
+      throw new Error(`Tool ${tool.name} has no category.`);
+    }
+    if (!tool.description) {
+      throw new Error(`Tool ${tool.name} is missing descripttion`);
+    }
+    commands[tool.name] = {
+      description: tool.description,
+      category,
+      args,
+    };
+  }
+
+  const lines: string[] = [];
+  lines.push(`/**
+ * @license
+ * Copyright ${new Date().getFullYear()} Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// NOTE: do not edit manually. Auto-generated by 'npm run cli:generate'.
+
+export interface ArgDef {
+  name: string;
+  type: string;
+  description: string;
+  required: boolean;
+  default?: string | number | boolean;
+  enum?: ReadonlyArray<string | number>;
+}
+export type Commands = Record<
+  string,
+  {
+    description: string;
+    category: string;
+    args: Record<string, ArgDef>
+  }
+>;
+export const commands: Commands = ${JSON.stringify(commands, null, 2)} as const;
+`);
+
+  fs.mkdirSync(path.dirname(OUTPUT_PATH), {recursive: true});
+  fs.writeFileSync(OUTPUT_PATH, lines.join(''));
+  console.log(`Generated CLI at ${OUTPUT_PATH}`);
+}
+
+generateCli().catch(err => {
+  console.error('Error during generation:', err);
+  process.exit(1);
+});