minimal-mcp-test.js•2.02 kB
#!/usr/bin/env node
/**
* Ultra-minimal MCP test to isolate the exact point of failure
*/
import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
// SECURITY FIX (DMCP-SEC-004): Import UnicodeValidator for input normalization
// Prevents homograph attacks, direction override, and mixed script attacks
import { UnicodeValidator } from "./src/security/validators/unicodeValidator.js";
// Create a minimal server that only responds to one tool
const server = new Server({
name: "minimal-test-server",
version: "1.0.0"
}, {
capabilities: {
tools: {}
}
});
// Add only a minimal tool
server.setRequestHandler("tools/list", async () => {
console.error("DEBUG: tools/list called");
return {
tools: [{
name: "test_tool",
description: "Minimal test tool",
inputSchema: {
type: "object",
properties: {}
}
}]
};
});
server.setRequestHandler("tools/call", async (request) => {
// SECURITY FIX (DMCP-SEC-004): Unicode normalization for user input
// Previously: Direct usage of tool name without validation
// Now: UnicodeValidator.normalize() prevents homograph attacks and direction override
const normalizedToolName = UnicodeValidator.normalize(request.params.name).normalizedContent;
console.error(`DEBUG: tools/call received for ${normalizedToolName}`);
if (normalizedToolName === "test_tool") {
console.error("DEBUG: Executing test_tool");
return {
content: [
{
type: "text",
text: "Test tool executed successfully!"
}
]
};
}
throw new Error(`Unknown tool: ${normalizedToolName}`);
});
// Add proper error handling
server.onerror = (error) => {
console.error("Server error:", error);
};
// Start server
console.error("Starting minimal MCP server...");
const transport = new StdioServerTransport();
await server.connect(transport);
console.error("Minimal MCP server ready");