Chrome DevTools MCP

Gets a console message by its ID. You can get all messages by calling list_console_messages.

Retrieve matched CSS rules, inline styles (element.style), inherited styles, custom properties, and cascade wrappers (@layer, @media, @container, @scope) for an element identified by its UID. Rules are ordered from highest to lowest cascade precedence and include source line numbers (e.g. index:196). Active (winning) declarations have no prefix tag, while (losing) overridden declarations are prefixed with [overloaded]. Treat the output as authoritative and complete. Results are paginated (10 rules per page by default); use pageIdx to page through the remaining rules. Requires a UID from take_s…

Retrieve user comments from the DevTools window for the page. If no comment is pending, waits up to `timeout` ms for the user to send one, then returns. Call it again to keep waiting.

Loads and caches a memory heapsnapshot and returns instances of a specific class with their IDs.

Loads and caches a memory heapsnapshot and returns all available information including statistics, static data, and aggregated node information. Supports pagination for aggregates.

Loads and caches a memory heapsnapshot and returns the dominator chain for a specific node ID. This helps to identify which objects are keeping the target node alive.

Loads and caches a memory heapsnapshot and returns duplicate strings grouped by their value.

Loads and caches a memory heapsnapshot and returns outgoing edges (references) for a specific node ID.

Loads and caches a memory heapsnapshot and returns detailed information about a specific object by its node ID, including size, type, distance, and DOM detachedness.

Loads and caches a memory heapsnapshot and returns retainers for a specific node ID.

Loads and caches a memory heapsnapshot and returns retaining paths for a specific node ID. This helps to understand why a node is not being garbage collected.

Loads and caches a memory heapsnapshot and returns snapshot summary stats, including native contexts and their sizes, and retained by context summary.

Gets a network request by an optional reqid, if omitted returns the currently selected request in the DevTools Network panel. Useful for inspecting request headers (including 'Cookie') and response headers (including 'Set-Cookie' and directives).

Returns the OS integration state (badge count and registered file handlers) for an installed web app, identified by its manifest ID.

Get the tab ID of the page

If a browser dialog was opened, use this command to handle it

Hover over the provided element

Installs a Chrome extension from the given path.

Installs a Progressive Web App (PWA) identified by its manifest ID. This installs through the PWA CDP domain without a user gesture or install dialog. DevTools installs default to browser display mode.

Launches an installed Progressive Web App using its saved display mode. Optionally opens a specific URL within the same app instead of the default start URL.

Description is built at runtime.

Lists all third-party developer tools the page exposes for providing runtime information (including debugging WebMCP tools and tools exposed via the 'devtoolstooldiscovery' event). Third-party developer tools can be called via the 'execute_3p_developer_tool()' MCP tool. Alternatively, third-party developer tools exposed via the 'devtoolstooldiscovery' event can be executed by calling 'evaluate_script' and adding the following command to the script: `window.__dtmcp.executeTool(toolName, params)` This might be helpful when the third-party developer tools return non-serializable values or when co…

Description is built at runtime.

Lists all the Chrome extensions installed in the browser. This includes their name, ID, version, and enabled status.

Lists the most recent requests for the target page since the last navigation.

Description is built at runtime.

Lists all WebMCP tools the page exposes (excluding debugging tools, which are exposed via 'list_3p_developer_tools').

Loads a URL

Go to a URL, or back, forward, or reload. Use project URL if not specified otherwise.

Open a new tab and load a URL. Use project URL if not specified otherwise.

Open a DevTools window for the selected page.

Provides more detailed information on a specific Performance Insight of an insight set that was highlighted in the results of a trace recording.

Start a performance trace on the target webpage. Use to find frontend performance issues, Core Web Vitals (LCP, INP, CLS), and improve page load speed.

Stop the active performance trace recording on the target webpage.

Press a key or key combination. Use this when other input methods like fill() cannot be used (e.g., keyboard shortcuts, navigation keys, or special key combinations).

Loads and caches a memory heapsnapshot and queries objects matching specific filters (className, propertyName, nodeType, retainedSize, selfSize, isDetached, sortBy).

Reloads an unpacked Chrome extension by its ID.

Resizes the page's window so that the page has specified dimension

Append an agent reply to a DevTools comment thread and mark it as resolved.

Navigate DevTools to a specified panel and highlight a target DOM node or network request. The parameters uid and reqid are mutually exclusive.

Starts recording a screencast (video) of the target page.

Stops the active screencast recording on the target page.

Takes a png screenshot

Select a page as a context for future tool calls.

Capture a heap snapshot of the target page. Use to analyze the memory distribution of JavaScript objects and debug memory leaks.

Take a screenshot of the page or element.

Take a text snapshot of the target page based on the a11y tree. The snapshot lists page elements along with a unique identifier (uid). Always use the latest snapshot. Prefer taking a snapshot over taking a screenshot. The snapshot indicates the element selected in the DevTools Elements panel (if any).

Triggers the default action of an extension by its ID.

Type text using keyboard into a previously focused input

Uninstalls a Chrome extension by its ID.

Uninstalls a Progressive Web App identified by its manifest ID and closes any open app windows.

Upload a file through a provided element.

Wait for the specified text to appear on the selected page. By default, hidden text is also matched. Set visible to true to wait until the matched text is visible.