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Programmatic use

@hoyasumii/libretranslate/mcp exports the server and its transports.

Stdio​

import { serveLibreTranslateMcpStdio } from "@hoyasumii/libretranslate/mcp";

const mcp = await serveLibreTranslateMcpStdio({
  baseUrl: "http://localhost:5000",
  apiKey: process.env.LIBRETRANSLATE_API_KEY, // optional
});
await mcp.closed; // settles when the client closes stdin

stdout carries the protocol, so nothing else may write to it. stdin/stdout can be other streams.

HTTP​

import { startLibreTranslateMcpServer } from "@hoyasumii/libretranslate/mcp";

const server = await startLibreTranslateMcpServer({ port: 0, baseUrl: "http://localhost:5000" });
console.log(server.url); // http://127.0.0.1:<port>/mcp
await server.close();

port: 0 picks a free port. shutdownToken enables POST /shutdown (the request carries it in X-LibreTranslate-Shutdown), and onShutdown runs after it closed the server.

Any transport​

import { createLibreTranslateClient } from "@hoyasumii/libretranslate";
import { buildLibreTranslateMcpServer } from "@hoyasumii/libretranslate/mcp";

const server = buildLibreTranslateMcpServer(createLibreTranslateClient({ baseUrl, apiKey }));
await server.connect(transport);

buildLibreTranslateMcpServer answers the bare McpServer, with every tool registered and no transport attached.

Also exported​

  • resolveMcpConfig, clientFor, configFilePath, readEnvFile, writeEnvFile: the configuration the CLI uses.
  • CATALOG, searchCatalog, describeOperation, invoke: what the generic tools run on.