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feat(mcp): default codegen language from PW_LANG_NAME #42150

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Merged
Pavel Feldman (pavelfeldman) merged 1 commit into from
Aug 6, 2026
+24 −2
Merged

feat(mcp): default codegen language from PW_LANG_NAME #42150

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8 changes: 8 additions & 0 deletions packages/playwright-core/src/tools/mcp/config.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -81,11 +81,17 @@ export type CLIOptions = {
viewportSize?: ViewportSize;
};

export const defaultCodegenLanguage: 'typescript' | 'python' | 'java' | 'csharp' =
process.env.PW_LANG_NAME === 'python' || process.env.PW_LANG_NAME === 'java' || process.env.PW_LANG_NAME === 'csharp'
? process.env.PW_LANG_NAME
: 'typescript';

const defaultConfig: MergedConfig = {
browser: {
launchOptions: {},
contextOptions: {},
},
codegen: defaultCodegenLanguage,
timeouts: {
action: 5000,
navigation: 60000,
Expand Down Expand Up @@ -406,6 +412,8 @@ export function configFromEnv(env?: NodeJS.ProcessEnv): Config & { configFile?:
options.cdpEndpoint = envToString(e.PLAYWRIGHT_MCP_CDP_ENDPOINT);
options.cdpHeader = headerParser(envToString(e.PLAYWRIGHT_MCP_CDP_HEADERS));
options.cdpTimeout = numberParser(e.PLAYWRIGHT_MCP_CDP_TIMEOUT);
if (e.PLAYWRIGHT_MCP_CODEGEN)
options.codegen = enumParser<'typescript' | 'python' | 'java' | 'csharp' | 'none'>('--codegen', ['none', 'typescript', 'python', 'java', 'csharp'], e.PLAYWRIGHT_MCP_CODEGEN);
options.config = envToString(e.PLAYWRIGHT_MCP_CONFIG);
if (e.PLAYWRIGHT_MCP_CONSOLE_LEVEL)
options.consoleLevel = enumParser<'error' | 'warning' | 'info' | 'debug'>('--console-level', ['error', 'warning', 'info', 'debug'], e.PLAYWRIGHT_MCP_CONSOLE_LEVEL);
Expand Down
4 changes: 2 additions & 2 deletions packages/playwright-core/src/tools/mcp/program.ts
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Expand Up @@ -16,7 +16,7 @@

import { Option as ProgramOption } from 'commander';
import * as mcpServer from '../utils/mcp/server';
import { commaSeparatedList, dotenvFileLoader, enumParser, headerParser, numberParser, resolutionParser, resolveCLIConfigForMCP, semicolonSeparatedList } from './config';
import { commaSeparatedList, defaultCodegenLanguage, dotenvFileLoader, enumParser, headerParser, numberParser, resolutionParser, resolveCLIConfigForMCP, semicolonSeparatedList } from './config';
import { setupExitWatchdog } from './watchdog';
import { createBrowserWithInfo } from './browserFactory';
import { BrowserBackend } from '../backend/browserBackend';
Expand All @@ -42,7 +42,7 @@ export function decorateMCPCommand(command: Command) {
.option('--cdp-endpoint <endpoint>', 'CDP endpoint to connect to.')
.option('--cdp-header <headers...>', 'CDP headers to send with the connect request, multiple can be specified.', headerParser)
.option('--cdp-timeout <timeout>', 'timeout in milliseconds for connecting to CDP endpoint, defaults to 30000ms', numberParser)
.option('--codegen <lang>', 'specify the language to use for code generation, possible values: "typescript", "python", "java", "csharp", "none". Default is "typescript".', enumParser.bind(null, '--codegen', ['none', 'typescript', 'python', 'java', 'csharp']))
.option('--codegen <lang>', `specify the language to use for code generation, possible values: "typescript", "python", "java", "csharp", "none". Default is "${defaultCodegenLanguage}".`, enumParser.bind(null, '--codegen', ['none', 'typescript', 'python', 'java', 'csharp']))
.option('--config <path>', 'path to the configuration file.')
.option('--console-level <level>', 'level of console messages to return: "error", "warning", "info", "debug". Each level includes the messages of more severe levels.', enumParser.bind(null, '--console-level', ['error', 'warning', 'info', 'debug']))
.option('--device <device>', 'device to emulate, for example: "iPhone 15"')
Expand Down
14 changes: 14 additions & 0 deletions tests/mcp/codegen.spec.ts
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Expand Up @@ -31,6 +31,20 @@ async function navigateToForm(client: Client, server: any) {
});
}

test('codegen defaults to PW_LANG_NAME', async ({ startClient, server }) => {
const { client } = await startClient({ env: { PW_LANG_NAME: 'python' } });
expect(await navigateToForm(client, server)).toHaveResponse({
code: `page.goto("${server.PREFIX}")`,
});

expect(await client.callTool({
name: 'browser_click',
arguments: { element: 'Submit button', target: 'e2' },
})).toHaveResponse({
code: `page.get_by_role("button", name="Submit").click()`,
});
});

test('codegen python', async ({ startClient, server }) => {
const { client } = await startClient({ args: ['--codegen=python'] });
expect(await navigateToForm(client, server)).toHaveResponse({
Expand Down
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