CloakBrowser MCP
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| PLAYWRIGHT_MCP_HEADLESS | No | Run the browser in headless mode. | true |
| PLAYWRIGHT_MCP_OUTPUT_DIR | No | Directory where upstream Playwright MCP writes artifacts. | .playwright-mcp |
| PLAYWRIGHT_MCP_OUTPUT_MODE | No | Return snapshots, console logs, and network logs through stdout or files. | stdout |
| PLAYWRIGHT_MCP_VIEWPORT_SIZE | No | Browser viewport in WIDTHxHEIGHT format. | |
| PLAYWRIGHT_MCP_BROWSER_ENGINE | No | Bridge browser engine: cloak or playwright. | cloak |
| PLAYWRIGHT_MCP_TIMEOUT_ACTION | No | Default action timeout in milliseconds. | 5000 |
| CLOAK_PLAYWRIGHT_MCP_HTTP_HOST | No | Streamable HTTP bind host. | 127.0.0.1 |
| CLOAK_PLAYWRIGHT_MCP_HTTP_PORT | No | Streamable HTTP bind port. | 3000 |
| CLOAK_PLAYWRIGHT_MCP_TRANSPORT | No | MCP transport exposed by the bridge: stdio or streamable-http. | stdio |
| CLOAK_PLAYWRIGHT_MCP_EXTRA_ARGS | No | Comma-separated or JSON array of extra Chromium launch arguments. | |
| CLOAK_PLAYWRIGHT_MCP_NO_SANDBOX | No | Adds --no-sandbox and disables Chromium sandboxing. | true |
| CLOAK_PLAYWRIGHT_MCP_STEALTH_ARGS | No | Adds CloakBrowser default stealth launch arguments. | true |
| PLAYWRIGHT_MCP_TIMEOUT_NAVIGATION | No | Default navigation timeout in milliseconds. | 60000 |
| CLOAK_PLAYWRIGHT_MCP_HTTP_ENDPOINT | No | Streamable HTTP endpoint path. | /mcp |
| CLOAK_PLAYWRIGHT_MCP_HTTP_AUTH_TOKEN | No | Optional Bearer token for Streamable HTTP. | |
| CLOAK_PLAYWRIGHT_MCP_CONSOLE_FALLBACK | No | Enables the compatibility patch for console messages. | true |
| CLOAK_PLAYWRIGHT_MCP_HTTP_SESSION_MAX | No | Maximum active Streamable HTTP sessions in one process. | 32 |
| CLOAK_PLAYWRIGHT_MCP_HTTP_SESSION_BACKEND | No | Session metadata backend. Only memory is implemented in this release. | memory |
| CLOAK_PLAYWRIGHT_MCP_HTTP_SESSION_IDLE_TTL_MS | No | Idle TTL for Streamable HTTP sessions. | 3600000 |
Capabilities
Features and capabilities supported by this server
| Capability | Details |
|---|---|
| tools | {} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| browser_closeA | Close the page |
| browser_resizeA | Resize the browser window |
| browser_console_messagesC | Returns all console messages |
| browser_handle_dialogC | Handle a dialog |
| browser_evaluateB | Evaluate JavaScript expression on page or element |
| browser_file_uploadB | Upload one or multiple files |
| browser_dropA | Drop files or MIME-typed data onto an element, as if dragged from outside the page. At least one of "paths" or "data" must be provided. |
| browser_fill_formC | Fill multiple form fields |
| browser_press_keyB | Press a key on the keyboard |
| browser_typeB | Type text into editable element |
| browser_navigateC | Navigate to a URL |
| browser_navigate_backA | Go back to the previous page in the history |
| browser_network_requestsA | Returns a numbered list of network requests since loading the page. Use browser_network_request with the number to get full details. |
| browser_network_requestA | Returns full details (headers and body) of a single network request, or a single part if |
| browser_run_code_unsafeA | Run a Playwright code snippet. Unsafe: executes arbitrary JavaScript in the Playwright server process and is RCE-equivalent. |
| browser_take_screenshotA | Take a screenshot of the current page. You can't perform actions based on the screenshot, use browser_snapshot for actions. |
| browser_snapshotB | Capture accessibility snapshot of the current page, this is better than screenshot |
| browser_clickC | Perform click on a web page |
| browser_dragB | Perform drag and drop between two elements |
| browser_hoverB | Hover over element on page |
| browser_select_optionC | Select an option in a dropdown |
| browser_tabsA | List, create, close, or select a browser tab. |
| browser_wait_forB | Wait for text to appear or disappear or a specified time to pass |
| cloakbrowser_binary_infoA | Return CloakBrowser package, cache, platform, and resolved browser binary information. |
| cloakbrowser_bridge_infoA | Return runtime metadata for the CloakBrowser bridge over upstream Playwright MCP. |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
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