// Standard MCP Server Protocol Implementation
// Handles standard JSON-RPC 2.0 MCP protocol (not Claude Desktop RPC)
const BASE_URL = 'https://api.llm.dflow.org';
// Tool definitions with proper MCP schema
const TOOLS = [
{
name: 'get_events',
description: 'Get a paginated list of all events with optional filtering and sorting.',
inputSchema: {
type: 'object',
properties: {
limit: {
type: 'integer',
minimum: 0,
maximum: 100,
description: 'Maximum number of events to return (0-100)'
},
cursor: {
type: 'integer',
minimum: 0,
description: 'Pagination cursor for fetching next page'
}
},
required: []
}
},
{
name: 'get_markets',
description: 'Get a paginated list of markets with optional filtering.',
inputSchema: {
type: 'object',
properties: {
limit: {
type: 'integer',
minimum: 0,
maximum: 100,
description: 'Number of markets to return (0-100)'
},
cursor: {
type: 'integer',
minimum: 0,
description: 'Pagination cursor for fetching next page'
}
},
required: []
}
},
{
name: 'get_trades',
description: 'Get a paginated list of trades across markets with optional filtering.',
inputSchema: {
type: 'object',
properties: {
limit: {
type: 'integer',
minimum: 0,
maximum: 100,
description: 'Number of trades to return (0-100)'
},
cursor: {
type: 'string',
description: 'Pagination cursor for fetching next page'
}
},
required: []
}
},
{
name: 'get_market_by_mint',
description: 'Get market details by token mint address.',
inputSchema: {
type: 'object',
properties: {
mint: {
type: 'string',
description: 'Token mint address to look up market'
}
},
required: ['mint']
}
},
{
name: 'get_live_data',
description: 'Get live data for events and markets.',
inputSchema: {
type: 'object',
properties: {
event_ticker: {
type: 'string',
description: 'Event ticker for live data'
},
market_ticker: {
type: 'string',
description: 'Market ticker for live data'
}
},
required: []
}
}
];
// Server info for standard MCP protocol
const SERVER_INFO = {
protocolVersion: '2025-06-18',
capabilities: {
tools: {
listChanged: false
},
prompts: {},
resources: {},
logging: {}
},
serverInfo: {
name: 'dflow-mcp-server',
version: '1.0.0',
description: 'Prediction Market Metadata API server for DFlow platform'
}
};
// API client function
async function apiRequest(method, path, params) {
const url = new URL(path, BASE_URL);
if (params && method === 'GET') {
Object.entries(params).forEach(([key, value]) => {
url.searchParams.append(key, String(value));
});
}
const response = await fetch(url.toString(), {
method,
headers: {
'Content-Type': 'application/json',
},
body: method === 'POST' && params ? JSON.stringify(params) : undefined,
});
if (!response.ok) {
throw new Error(`HTTP ${response.status}: ${await response.text()}`);
}
return await response.json();
}
// Standard MCP handlers
const mcpHandlers = {
initialize: async (request) => {
console.log(`🚀 MCP STANDARD: initialize request`);
console.log(`📋 Client info:`, request.params?.clientInfo);
const response = {
jsonrpc: "2.0",
id: request.id,
result: SERVER_INFO
};
console.log(`✅ MCP INITIALIZE RESPONSE: ${JSON.stringify(response, null, 2)}`);
return response;
},
'tools/list': async (request) => {
console.log(`🛠️ MCP STANDARD: tools/list request`);
const response = {
jsonrpc: "2.0",
id: request.id,
result: {
tools: TOOLS
}
};
console.log(`✅ MCP TOOLS/LIST RESPONSE: ${JSON.stringify(response, null, 2)}`);
return response;
},
'tools/call': async (request) => {
const { name, arguments: args } = request.params;
const toolArgs = args || {};
console.log(`🔧 MCP STANDARD: tools/call - ${name}`);
console.log(`📝 Args: ${JSON.stringify(toolArgs)}`);
let result;
try {
switch (name) {
case 'get_events':
result = await apiRequest('GET', '/api/v1/events', toolArgs);
break;
case 'get_markets':
result = await apiRequest('GET', '/api/v1/markets', toolArgs);
break;
case 'get_trades':
result = await apiRequest('GET', '/api/v1/trades', toolArgs);
break;
case 'get_market_by_mint':
result = await apiRequest('GET', `/api/v1/markets/by-mint/${toolArgs.mint}`);
break;
case 'get_live_data':
const path = toolArgs.event_ticker
? `/api/v1/events/live-data/${toolArgs.event_ticker}`
: toolArgs.market_ticker
? `/api/v1/markets/live-data/${toolArgs.market_ticker}`
: '/api/v1/live-data';
result = await apiRequest('GET', path);
break;
default:
throw new Error(`Unknown tool: ${name}`);
}
const response = {
jsonrpc: "2.0",
id: request.id,
result: {
content: [
{
type: 'text',
text: JSON.stringify(result, null, 2)
}
]
}
};
console.log(`✅ MCP TOOLS/CALL RESPONSE: ${JSON.stringify(response, null, 2)}`);
return response;
} catch (error) {
console.log(`❌ TOOL ERROR: ${error.message}`);
const errorResponse = {
jsonrpc: "2.0",
id: request.id,
error: {
code: -32603,
message: error.message,
data: {
tool: name,
arguments: toolArgs
}
}
};
console.log(`❌ MCP ERROR RESPONSE: ${JSON.stringify(errorResponse, null, 2)}`);
return errorResponse;
}
},
// Health check for debugging
health: async (request) => {
console.log(`💓 MCP STANDARD: health check`);
const response = {
jsonrpc: "2.0",
id: request.id,
result: {
status: "healthy",
timestamp: new Date().toISOString(),
version: SERVER_INFO.serverInfo.version,
methods: Object.keys(mcpHandlers),
tools_count: TOOLS.length,
protocol: "standard_mcp_jsonrpc"
}
};
console.log(`✅ MCP HEALTH RESPONSE: ${JSON.stringify(response, null, 2)}`);
return response;
},
// Notifications (no response expected)
'notifications/prompts/list': async (request) => {
console.log(`📢 MCP STANDARD: notifications/prompts/list`);
// No response for notifications
return null;
},
'notifications/resources/list': async (request) => {
console.log(`📢 MCP STANDARD: notifications/resources/list`);
// No response for notifications
return null;
},
'notifications/tools/list_changed': async (request) => {
console.log(`📢 MCP STANDARD: notifications/tools/list_changed`);
// No response for notifications
return null;
}
};
// Main standard MCP handler
exports.handler = async function(event, context) {
const { httpMethod, body, headers, requestContext } = event;
const requestPath = requestContext.path || '';
console.log(`🌟 MCP STANDARD: ${httpMethod} ${requestPath}`);
console.log(`📦 MCP STANDARD BODY: ${body}`);
// Handle OPTIONS for CORS
if (httpMethod === 'OPTIONS') {
return {
statusCode: 200,
headers: {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type, Authorization, x-api-key',
'Access-Control-Max-Age': '86400',
}
};
}
// Handle only POST requests for MCP
if (httpMethod !== 'POST') {
return {
statusCode: 405,
headers: {
'Access-Control-Allow-Origin': '*',
'Content-Type': 'application/json'
},
body: JSON.stringify({
jsonrpc: "2.0",
id: null,
error: {
code: -32600,
message: 'Method not allowed'
}
})
};
}
try {
let request;
// Parse request
try {
request = JSON.parse(body);
console.log(`📋 MCP STANDARD PARSED: ${JSON.stringify(request, null, 2)}`);
} catch (parseError) {
console.log(`💥 MCP STANDARD PARSE ERROR: ${parseError.message}`);
return {
statusCode: 400,
headers: {
'Access-Control-Allow-Origin': '*',
'Content-Type': 'application/json'
},
body: JSON.stringify({
jsonrpc: "2.0",
id: null,
error: {
code: -32700,
message: 'Parse error',
data: parseError.message
}
})
};
}
// Add CORS headers to all responses
const responseHeaders = {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type, Authorization, x-api-key',
'Content-Type': 'application/json'
};
// Handle notifications (no response expected)
if (request.method && request.method.startsWith('notifications/')) {
console.log(`📢 MCP STANDARD: Notification - ${request.method}`);
const handler = mcpHandlers[request.method];
if (handler) {
await handler(request);
// Return 200 OK for notifications (no content)
return {
statusCode: 200,
headers: responseHeaders,
body: ''
};
}
}
// Handle standard JSON-RPC methods
if (request.jsonrpc === '2.0' && request.method && !request.type) {
console.log(`📜 MCP STANDARD: JSON-RPC method - ${request.method}`);
const methodName = request.method;
const handler = mcpHandlers[methodName];
if (handler) {
const response = await handler(request);
// Don't respond to notifications
if (response === null) {
return {
statusCode: 200,
headers: responseHeaders,
body: ''
};
}
console.log(`📤 MCP STANDARD RESPONSE: ${JSON.stringify(response, null, 2)}`);
return {
statusCode: 200,
headers: responseHeaders,
body: JSON.stringify(response)
};
}
}
// Method not found - provide helpful error
const errorResponse = {
jsonrpc: "2.0",
id: request.id,
error: {
code: -32601,
message: 'Method not found',
data: {
available_methods: Object.keys(mcpHandlers),
request_method: request.method,
protocol: "standard_mcp_jsonrpc",
supported_formats: ["jsonrpc: 2.0"],
examples: {
initialize: {
method: "initialize",
params: { protocolVersion: "2025-06-18", capabilities: {}, clientInfo: { name: "...", version: "..." } },
jsonrpc: "2.0",
id: 0
},
tools_list: {
method: "tools/list",
jsonrpc: "2.0",
id: 1
},
tools_call: {
method: "tools/call",
params: { name: "get_events", arguments: { limit: 10 } },
jsonrpc: "2.0",
id: 2
}
}
}
}
};
console.log(`❌ MCP STANDARD ERROR RESPONSE: ${JSON.stringify(errorResponse, null, 2)}`);
return {
statusCode: 200,
headers: responseHeaders,
body: JSON.stringify(errorResponse)
};
} catch (error) {
const errorResponse = {
jsonrpc: "2.0",
id: null,
error: {
code: -32603,
message: 'Internal error',
data: error.message
}
};
console.log(`💥 MCP STANDARD INTERNAL ERROR: ${JSON.stringify(errorResponse, null, 2)}`);
return {
statusCode: 500,
headers: {
'Access-Control-Allow-Origin': '*',
'Content-Type': 'application/json'
},
body: JSON.stringify(errorResponse)
};
}
};
