npm install @reaatech/mcp-gateway-validation
# or
pnpm add @reaatech/mcp-gateway-validation

import {
  createValidationMiddleware,
  getSchemaValidator,
} from "@reaatech/mcp-gateway-validation";
import express from "express";
 
const app = express();
app.use(express.json());
app.use(createValidationMiddleware());
 
app.post("/mcp", (req, res) => {
  // req.rpcBody is typed — request already validated
  console.log("Method:", req.rpcBody?.method);
});

// Register custom tool schemas
import { getCustomSchemaManager } from "@reaatech/mcp-gateway-validation";
 
const manager = getCustomSchemaManager();
manager.registerSchema("my_tool", {
  type: "object",
  properties: {
    query: { type: "string" },
    limit: { type: "number", minimum: 1, maximum: 100 },
  },
  required: ["query"],
});
 
const result = manager.validateArguments("my_tool", { query: "hello" });
// → { valid: true }

import {
  createValidationMiddleware,
  getSchemaValidator,
} from "@reaatech/mcp-gateway-validation";
 
const validator = getSchemaValidator();
 
app.post("/mcp", createValidationMiddleware(), (req, res, next) => {
  const { method, params } = req.rpcBody!;
 
  // Additional method-level validation
  const result = validator.validateMcpRequest(method, params);
  if (!result.valid) {
    return res.status(400).json({
      jsonrpc: "2.0",
      error: {
        code: -32602,
        message: "Invalid params",
        data: { errors: result.errors },
      },
    });
  }
 
  next();
});

import { getCustomSchemaManager } from "@reaatech/mcp-gateway-validation";
 
const manager = getCustomSchemaManager();
 
// Register at startup from config
for (const [toolName, schema] of Object.entries(toolSchemas)) {
  manager.registerSchema(toolName, schema);
}
 
// Validate during request processing
const { valid, errors } = manager.validateArguments("my_tool", args);
if (!valid) {
  console.error("Invalid arguments:", errors);
}