Generate a thumbnail / social share image from a title using the ThumbAPI service.

Use this when the user wants to create a YouTube thumbnail, Instagram post image, X/Twitter card, LinkedIn share image, or blog post hero image from a headline or title.

Returns the generated image inline (viewable by the model) plus metadata: format, outputFormat, generationId, and imageUrl (a public URL on ThumbAPI's CDN — use this to download or embed the image without handling base64).

Requires an API key. Either set THUMBAPI_API_KEY in the environment or run the login tool once — that starts an OAuth-style browser flow and saves the key to ~/.thumbapi/config.json. Get a key at https://thumbapi.dev.

Sign the MCP server in to ThumbAPI. Opens a browser to app.thumbapi.dev/mcp-login, asks the user to consent, and saves the returned API key to ~/.thumbapi/config.json.

Call this tool when:

• The user asks to log in / sign in / authenticate to ThumbAPI.

• Another tool (generate_thumbnail) returns "no API key found".

The tool blocks up to ~30s per invocation waiting for the browser callback. If the user hasn't consented yet, it returns "still waiting" — just call login again to keep waiting. The underlying local callback server stays alive across calls for up to 15 minutes.

Remove the saved ThumbAPI API key from ~/.thumbapi/config.json. Does not revoke the key on the server — that's a separate action from the dashboard.