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/**

* @proofable/mcp: discovery metadata only.

* The hosted Proofable MCP server runs at https://mcp.proofable.me/mcp (the single

* canonical endpoint: OAuth from its 401 challenge, or a server key as Bearer),

* not inside this npm package.

*

* @see https://mcp.proofable.me/mcp

* @see https://docs.proofable.me/mcp/setup

*/

import { readFileSync } from 'node:fs';

import { fileURLToPath, pathToFileURL } from 'node:url';

import { dirname, join, resolve } from 'node:path';

import { createInterface } from 'node:readline';

const __dirname = dirname(fileURLToPath(import.meta.url));

/** @returns {Record<string, unknown>} Parsed MCP registry / installer manifest (`server.json`). */

export function loadServerManifest() {

const raw = readFileSync(join(__dirname, 'server.json'), 'utf8');

return JSON.parse(raw);

}

export const serverManifest = loadServerManifest();

const REMOTE_MCP_URL =

process.env.PROOFABLE_MCP_URL ||

serverManifest?.remotes?.[0]?.url ||

'https://mcp.proofable.me/mcp';

function buildFallbackTools() {

const list = Array.isArray(serverManifest?.tools) ? serverManifest.tools : [];

return list.map((t) => ({

name: t.name,

description: t.description,

inputSchema: t.inputSchema || { type: 'object', properties: {} },

}));

}

async function forwardJsonRpc(message) {

const key = String(

process.env.PROOFABLE_ACCESS_KEY || process.env.PROFILE_ACCESS_KEY || '',

).trim();

const headers = {

'content-type': 'application/json',

accept: 'application/json, text/event-stream',

...(key ? { authorization: `Bearer ${key}`, 'x-proofable-access-key': key } : {}),

};

const res = await fetch(REMOTE_MCP_URL, {

method: 'POST',

headers,

body: JSON.stringify(message),

signal: AbortSignal.timeout(15_000),

});

const raw = await res.text();

const payload =

raw.startsWith('event:') || raw.includes('\ndata:')

? raw

.split('\n')

.filter((line) => line.startsWith('data:'))

.map((line) => line.slice(5).trim())

.join('')

: raw;

return JSON.parse(payload);

}

async function handleStdioMessage(line) {

const trimmed = String(line || '').trim();

if (!trimmed) return;

let msg;

try {

msg = JSON.parse(trimmed);

} catch {

return;

}

if (!msg || typeof msg !== 'object') return;

if (msg.id === undefined || msg.id === null) return;

const { id, method, params } = msg;

const write = (obj) => process.stdout.write(`${JSON.stringify(obj)}\n`);

if (method === 'ping') {

write({ jsonrpc: '2.0', id, result: {} });

return;

}

if (method === 'resources/list') {

write({ jsonrpc: '2.0', id, result: { resources: [] } });

return;

}

if (method === 'resources/templates/list') {

write({ jsonrpc: '2.0', id, result: { resourceTemplates: [] } });

return;

}

if (method === 'prompts/list') {

write({ jsonrpc: '2.0', id, result: { prompts: [] } });

return;

}

try {

const remote = await forwardJsonRpc(msg);

if (remote && typeof remote === 'object' && ('result' in remote || 'error' in remote)) {

if (method === 'tools/list' && Array.isArray(remote?.result?.tools)) {

const byName = new Map(remote.result.tools.map((t) => [t.name, t]));

for (const fallback of buildFallbackTools()) {

if (!byName.has(fallback.name)) byName.set(fallback.name, fallback);

}

write({

jsonrpc: '2.0',

id,

result: { ...remote.result, tools: [...byName.values()] },

});

return;

}

write({

jsonrpc: '2.0',

id,

...(remote.result !== undefined ? { result: remote.result } : { error: remote.error }),

});

return;

}

} catch {

// Offline or sandboxed container inspection falls back to server.json metadata.

}

if (method === 'initialize') {

write({

jsonrpc: '2.0',

id,

result: {

protocolVersion: params?.protocolVersion || '2025-03-26',

capabilities: { tools: { listChanged: false } },

serverInfo: {

name: String(serverManifest?.name || 'io.github.proofable/mcp'),

version: String(serverManifest?.version || '0.1.7'),

},

},

});

return;

}

if (method === 'tools/list') {

write({

jsonrpc: '2.0',

id,

result: { tools: buildFallbackTools() },

});

return;

}

write({

jsonrpc: '2.0',

id,

error: { code: -32601, message: `Method not available offline: ${String(method)}` },

});

}

const invokedArg = String(process.argv[1] || '').replace(/\\/g, '/');

const isDirectEntry =

invokedArg.endsWith('/index.mjs') ||

invokedArg === 'index.mjs' ||

invokedArg === './index.mjs' ||

invokedArg.endsWith('/proofable-mcp') ||

(invokedArg ? import.meta.url === pathToFileURL(resolve(process.argv[1])).href : false);

if (isDirectEntry) {

process.stdin.setEncoding('utf8');

process.stdin.resume();

const rl = createInterface({ input: process.stdin, crlfDelay: Infinity });

let queue = Promise.resolve();

rl.on('line', (line) => {

queue = queue.then(() => handleStdioMessage(line)).catch(() => {});

});

}