press_up
Holds the UP button on a GameBoy emulator for a specified duration using the MCP GameBoy Server, enabling precise control for in-game actions or navigation.
Instructions
Press the UP button on the GameBoy
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| duration_frames | No | Number of frames to hold the button |
Implementation Reference
- src/tools.ts:28-35 (handler)The inline handler function for the press_up tool (dynamically generated when button='UP'). It presses the UP button for the specified duration_frames and returns the current screen as ImageContent.
async ({ duration_frames }): Promise<CallToolResult> => { // Press the button using the service (advances one frame) emulatorService.pressButton(button, duration_frames); // Return the current screen using the service const screen = emulatorService.getScreen(); return { content: [screen] }; } - src/tools.ts:26-27 (schema)Input schema for the press_up tool: duration_frames as positive integer (default 1 or 25).
duration_frames: z.number().int().positive().optional().default(1).describe('Number of frames to hold the button').default(25) }, - src/tools.ts:21-37 (registration)Dynamic registration of press_up tool via loop over GameBoyButton values (includes 'UP'), using server.tool() with name `press_${button.toLowerCase()}`
Object.values(GameBoyButton).forEach(button => { server.tool( `press_${button.toLowerCase()}`, `Press the ${button} button on the GameBoy`, { duration_frames: z.number().int().positive().optional().default(1).describe('Number of frames to hold the button').default(25) }, async ({ duration_frames }): Promise<CallToolResult> => { // Press the button using the service (advances one frame) emulatorService.pressButton(button, duration_frames); // Return the current screen using the service const screen = emulatorService.getScreen(); return { content: [screen] }; } ); }); - src/types.ts:9-18 (helper)GameBoyButton enum providing the 'UP' value used to generate the 'press_up' tool name.
export enum GameBoyButton { UP = 'UP', DOWN = 'DOWN', LEFT = 'LEFT', RIGHT = 'RIGHT', A = 'A', B = 'B', START = 'START', SELECT = 'SELECT' } - src/emulatorService.ts:72-80 (helper)Supporting pressButton method in EmulatorService called by the tool handler to perform the actual button press.
pressButton(button: GameBoyButton, durationFrames: number): ImageContent { log.debug(`Pressing button: ${button}`); if (!this.isRomLoaded()) { log.warn('Attempted to press button with no ROM loaded'); throw new Error('No ROM loaded'); } this.emulator.pressButton(button, durationFrames); // This advances one frame return this.getScreen(); }