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chore(mcp): default to extension protocol v1 #40193

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Merged
yury-s merged 1 commit into from
Apr 14, 2026
Merged

chore(mcp): default to extension protocol v1 #40193

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6 changes: 3 additions & 3 deletions packages/playwright-core/src/tools/mcp/cdpRelay.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,8 @@
* - /extension/guid - Extension connection
*
* Protocol version is controlled by PLAYWRIGHT_EXTENSION_PROTOCOL env variable:
* - v1: single-tab, extension manages debugger attachment
* - v2 (default): multi-tab, relay manages debugger via chrome.* APIs
* - v1 (default): single-tab, extension manages debugger attachment
* - v2: multi-tab, relay manages debugger via chrome.* APIs
*/

import { spawn } from 'child_process';
Expand Down Expand Up @@ -77,7 +77,7 @@ export class CDPRelayServer {
this._browserChannel = browserChannel;
this._userDataDir = userDataDir;
this._executablePath = executablePath;
this._protocolVersion = parseInt(process.env.PLAYWRIGHT_EXTENSION_PROTOCOL ?? protocol.VERSION.toString(), 10);
this._protocolVersion = parseInt(process.env.PLAYWRIGHT_EXTENSION_PROTOCOL ?? protocol.DEFAULT_VERSION.toString(), 10);

const sendCommand = (method: string, params: any): Promise<any> => {
if (!this._extensionConnection)
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11 changes: 8 additions & 3 deletions packages/playwright-core/src/tools/mcp/protocol.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -14,9 +14,14 @@
* limitations under the License.
*/

// Whenever the commands/events change, the version must be updated. The latest
// extension version should be compatible with the old MCP clients.
export const VERSION = 2;
// The latest protocol version defined in this file. Bumped whenever the
// commands/events change. The latest extension version should remain
// compatible with older MCP clients.
export const LATEST_VERSION = 2;

// The protocol version used by default when PLAYWRIGHT_EXTENSION_PROTOCOL is
// not set. May lag behind LATEST_VERSION while a new version is rolling out.
export const DEFAULT_VERSION = 1;

// Structural mirrors of @types/chrome shapes used over the wire. The extension
// imports the real chrome.* types and they are structurally compatible.
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