mcp-version-test.ts•3.71 kB
/**
* MCP Version Testing Endpoint
* Tests different protocol versions Claude Web might expect
*/
import { VercelRequest, VercelResponse } from '@vercel/node';
export default async function handler(req: VercelRequest, res: VercelResponse) {
// CORS headers
res.setHeader('Access-Control-Allow-Origin', '*');
res.setHeader('Access-Control-Allow-Methods', '*');
res.setHeader('Access-Control-Allow-Headers', '*');
if (req.method === 'OPTIONS') {
return res.status(200).end();
}
if (req.method === 'POST') {
try {
const message = req.body;
console.log('MCP Version Test Request:', JSON.stringify(message, null, 2));
// Handle initialize with version negotiation
if (message.method === 'initialize') {
// Try the latest MCP protocol version
const protocolVersions = [
'2024-11-05', // Latest known version
'2024-10-07', // Alternative
'0.1.0', // Semantic version
'1.0', // Simple version
'2.0' // Alternative
];
// Use the first version, or match client's preference
const clientVersion = message.params?.protocolVersion;
const useVersion = protocolVersions.includes(clientVersion) ? clientVersion : protocolVersions[0];
return res.status(200).json({
jsonrpc: '2.0',
id: message.id,
result: {
protocolVersion: useVersion,
capabilities: {
tools: {}
},
serverInfo: {
name: 'mcp-version-test',
version: '1.0.0'
}
}
});
}
if (message.method === 'tools/list') {
return res.status(200).json({
jsonrpc: '2.0',
id: message.id,
result: {
tools: [
{
name: 'version_test',
description: 'Test different MCP protocol versions',
inputSchema: {
type: 'object',
properties: {
message: {
type: 'string',
description: 'Test message'
}
},
required: []
}
}
]
}
});
}
if (message.method === 'tools/call') {
const toolName = message.params?.name;
if (toolName === 'version_test') {
return res.status(200).json({
jsonrpc: '2.0',
id: message.id,
result: {
content: [
{
type: 'text',
text: '🎉 MCP Version Test Success!\n\nClaude Web successfully connected and can call tools.\nProtocol version compatibility confirmed!'
}
]
}
});
}
}
// Unknown method
return res.status(200).json({
jsonrpc: '2.0',
id: message.id,
error: {
code: -32601,
message: `Method not found: ${message.method}`
}
});
} catch (error) {
console.error('MCP Version Test Error:', error);
return res.status(200).json({
jsonrpc: '2.0',
id: null,
error: {
code: -32700,
message: 'Parse error'
}
});
}
}
// GET request - show available versions
return res.status(200).json({
message: 'MCP Version Testing Server',
supported_versions: [
'2024-11-05',
'2024-10-07',
'0.1.0',
'1.0',
'2.0'
],
note: 'This endpoint tests different MCP protocol versions for Claude Web compatibility'
});
}