/**
* Scale Heroku dynos
*/
import { json, error, type ToolDefinition } from "../lib/mcp-core.js";
import { scaleDyno, getFormations } from "../lib/heroku-api.js";
export const scaleTool: ToolDefinition = {
name: "heroku_scale",
description: "Scale dynos for a Heroku app. Change the number of running dynos.",
inputSchema: {
type: "object",
properties: {
appName: {
type: "string",
description: "Name of the Heroku app",
},
dyno: {
type: "string",
description: "Dyno type to scale (e.g., web, worker)",
},
quantity: {
type: "number",
description: "Number of dynos to run",
},
size: {
type: "string",
description: "Dyno size (eco, basic, standard-1x, standard-2x, etc.)",
},
},
required: ["appName", "dyno", "quantity"],
},
handler: async (args) => {
try {
const appName = args.appName as string;
const dyno = args.dyno as string;
const quantity = args.quantity as number;
const size = args.size as string | undefined;
const result = await scaleDyno(appName, dyno, quantity, size);
// Get full formation after scaling
const formation = await getFormations(appName);
return json({
app: appName,
scaled: {
type: result.type,
quantity: result.quantity,
size: result.size,
},
message: `Scaled ${dyno} to ${quantity} dyno(s)`,
formation: formation.map(f => ({
type: f.type,
quantity: f.quantity,
size: f.size,
})),
});
} catch (err) {
return error(`Failed to scale: ${err instanceof Error ? err.message : err}`);
}
},
};
