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This tutorial assumes you already have a working Redop server.

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What you will add

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

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Step 1: Install Zod

bun add zod

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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,
      };
    },
  });

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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

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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.

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