Schema | mcp-alphabanana

Server Configuration

Describes the environment variables required to run the server.

Name	Required	Description	Default
`GEMINI_API_KEY`	Yes	The Google Gemini API key required for image generation.
`MCP_FALLBACK_OUTPUT`	No	Optional: Set a custom fallback directory for write failures.

Capabilities

Features and capabilities supported by this server

Capability	Details
`tools`	{}
`logging`	{}
`completions`	{}

Tools

Functions exposed to the LLM to take actions

Name	Description
generate_image	Generate image assets using Gemini AI with optional transparency and reference images. [Model Guidance] Flash3.1 (recommended): High quality, very fast, supports grounding and advanced features. Pro3: Higher fidelity, but more costly and slower. Flash2.5: Legacy, maintained for compatibility. Does not support 0.5K, 2K, or 4K resolutions. [Aspect Ratios & Pixel Sizes] Gemini supports the following aspect ratios (model-dependent): Common to all models: 1:1 (e.g. 512x512, 1024x1024), 2:3 (424x632, 848x1264), 3:2 (632x424, 1264x848), 3:4 (448x600, 896x1200), 4:3 (600x448, 1200x896), 4:5 (410x512, 820x1024), 5:4 (512x410, 1024x820), 9:16 (360x640, 720x1280), 16:9 (688x384, 1376x768), 21:9 (896x384, 1792x768) Flash3.1 only: 1:4 (128x512, 256x1024), 4:1 (512x128, 1024x256), 1:8 (64x512, 128x1024), 8:1 (512x64, 1024x128) (0.5K/1K: see above, 2K/4K: double these sizes) To avoid cropping or padding, set width and height to match a supported aspect ratio. If the requested size does not match, the image will be center-cropped or padded after generation. If you intentionally want to control the resizing/cropping behavior, use the 'resizeMode' parameter: 'crop' (default, center crop), 'letterbox' (fit with padding), 'contain' (trim transparent margins then fit), or 'stretch' (distort to fit). [IMPORTANT] Always preserve the user's prompt as-is, including language and nuance. Do not translate or summarize.

Name

Description

generate_image

Generate image assets using Gemini AI with optional transparency and reference images.

[Model Guidance]

Flash3.1 (recommended): High quality, very fast, supports grounding and advanced features.
Pro3: Higher fidelity, but more costly and slower.
Flash2.5: Legacy, maintained for compatibility. Does not support 0.5K, 2K, or 4K resolutions.

[Aspect Ratios & Pixel Sizes] Gemini supports the following aspect ratios (model-dependent):

Common to all models: 1:1 (e.g. 512x512, 1024x1024), 2:3 (424x632, 848x1264), 3:2 (632x424, 1264x848), 3:4 (448x600, 896x1200), 4:3 (600x448, 1200x896), 4:5 (410x512, 820x1024), 5:4 (512x410, 1024x820), 9:16 (360x640, 720x1280), 16:9 (688x384, 1376x768), 21:9 (896x384, 1792x768)
Flash3.1 only: 1:4 (128x512, 256x1024), 4:1 (512x128, 1024x256), 1:8 (64x512, 128x1024), 8:1 (512x64, 1024x128) (0.5K/1K: see above, 2K/4K: double these sizes)

To avoid cropping or padding, set width and height to match a supported aspect ratio. If the requested size does not match, the image will be center-cropped or padded after generation. If you intentionally want to control the resizing/cropping behavior, use the 'resizeMode' parameter: 'crop' (default, center crop), 'letterbox' (fit with padding), 'contain' (trim transparent margins then fit), or 'stretch' (distort to fit).

[IMPORTANT] Always preserve the user's prompt as-is, including language and nuance. Do not translate or summarize.

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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