Add Typed Input with Zod - Redop

This tutorial assumes you already have a working Redop server.

What you will add

runtime validation for tool input
TypeScript inference inside the handler
defaults and constraints in one schema

Step 1: Install Zod

bun add zod

Step 2: Add a schema

import { Redop } from "@redopjs/redop";
import { z } from "zod";

new Redop({ serverInfo: { name: "typed-server" } })
  .tool("search_posts", {
    description: "Search posts by query",
    inputSchema: z.object({
      query: z.string().min(1),
      limit: z.number().int().min(1).max(20).default(10),
    }),
    handler: ({ input }) => {
      return {
        query: input.query,
        limit: input.limit,
      };
    },
  });

What changed

input.query is now typed as string
input.limit is now typed as number
Redop uses the same schema for runtime parsing and tool discovery

Milestone

If your client can still connect and call the tool, you now have the core Redop flow working: transport, schema parsing, and typed handler input.

Next

Add middleware and hooks