Available tools

The Model Context Protocol (MCP) server provides the following tools, grouped into mouse, keyboard, screen, application, and session tools. Agents use them to operate the desktop during a streaming session. All tool names use the agentaccess___ prefix.

Mouse tools

left_click

Perform a left click at the given coordinates.

Parameters: x (required), y (required), modifiers (optional, for example ctrl or ctrl+shift).

double_click

Perform a double click at the given coordinates.

Parameters: x (required), y (required), modifiers (optional).

triple_click

Perform a triple click at the given coordinates.

Parameters: x (required), y (required), modifiers (optional).

right_click

Perform a right click at the given coordinates.

Parameters: x (required), y (required), modifiers (optional).

middle_click

Perform a middle click at the given coordinates.

Parameters: x (required), y (required), modifiers (optional).

left_click_drag

Perform a left click drag from start coordinates to end coordinates.

Parameters: start_x (required), start_y (required), end_x (required), end_y (required).

left_mouse_down

Press and hold the left mouse button at the given coordinates.

Parameters: x (required), y (required), modifiers (optional).

left_mouse_up

Release the left mouse button at the given coordinates.

Parameters: x (required), y (required), modifiers (optional).

move_pointer

Move the pointer to the given coordinates.

Parameters: x (required), y (required).

scroll

Scroll the mouse wheel at the given coordinates.

Parameters: x (required), y (required), scroll_direction (required, one of Up, Down, Left, or Right), scroll_amount (required, in ticks, where 120 ticks equals one wheel notch), modifiers (optional).

Keyboard tools

type_text

Type text by simulating keyboard events for each character.

Parameters: text (required, up to 10,000 characters).

key

Press a key or key combination.

Parameters: keys (required, a single key or combination joined by +, for example a, ctrl+c, or ctrl+shift+s).

hold_key

Hold a key or key combination for a specified duration.

Parameters: keys (required), duration (required, 1 to 30 seconds).

Screen tools

screenshot

Capture a screenshot of the desktop. The returned image dimensions define the coordinate space for all mouse tools.

Parameters: include_cursor (optional, defaults to false).

Application tools

Note

These application tools appear in the agent's tool list only when applications are registered in the fleet image's catalog. If the image has no registered applications, these tools are not available.

launch_application

Launch an application from the ones available in the fleet image's catalog.

Parameters: id (required). The application identifier.

The tool's own description lists the identifiers of the available applications. The MCP server populates this description from the fleet image's catalog (for example, firefox, notepad++, or eclipse). Use one of the listed identifiers. An id that is not in the catalog returns isError: true with SERVER_ERROR: Invalid input. IDs are set when the image is built. You cannot determine an ID from the application name.

Launching an application does not replace what is already running. The previously launched application stays open. That is why the app switcher exists.

toggle_app_switcher

Open or close the app-switcher overlay.

Parameters: none.

This tool only toggles the overlay. To bring a particular application to the foreground, follow up with a left_click on its thumbnail, using coordinates read from a screenshot. No tool reports which application is currently in the foreground, so an agent that needs to know must capture a screenshot and look.

Note

The app switcher is available only when the fleet's Stream view is set to Application, which displays only the windows of applications that users open. It is not available when Stream view is set to Desktop, because WorkSpaces Applications then provides the standard desktop and taskbar for the operating system.

Session tools

The close_session tool is part of the stateless MCP protocol (version 2026-07-28). With the earlier MCP protocol versions, you end the session by closing the MCP client in your agent code, which sends an HTTP DELETE request instead. For more information, see Session cleanup.

Note

To watch an agent while it works, code the agent to open a streaming URL in a browser. Keep the URL out of the model's context, because it grants session access. You can create the URL in one of two ways:

• Call the CreateStreamingURL API with the stack, fleet, and userId values from get_session_info, then open the returned URL in a browser.

• Read the streaming_url value from the _meta field of the get_session_info response, then open it in a browser.

In both cases, the agent's own code handles the URL, so it never exposes the session credentials to the model.

get_session_info

Return information about the current session.

Parameters: none.

Returns the following identifier fields as the tool result: mcpSessionId, stack, userId, workSpacesSessionId, and fleet.

close_session

The agent calls this tool to end the current session. This closes the MCP session. By default, it does not expire the WorkSpaces Applications streaming session, and the streaming instance is preserved for reuse.

Parameters: expire_streaming_session (optional, Boolean, default false). Set it to true to also expire the WorkSpaces Applications streaming session, which terminates the streaming instance and triggers the fleet's configured autoscaling policy. For more information about autoscaling, see Fleet Auto Scaling for Amazon WorkSpaces Applications.