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Use .use(...) as the main composition primitive when your server grows past a single file. The simplest mental model is:
  • one feature folder owns one area of the server
  • that folder exports one Redop instance
  • the root server imports those feature modules and attaches them with .use(...)

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Why this pattern works

This keeps composition obvious:
  • folder structure matches server structure
  • each feature can register its own tools, resources, prompts, middleware, and hooks
  • the root server stays small
  • naming stays explicit instead of being rewritten by a grouping helper
src/
  features/
    notes/
      create.ts
      list.ts
      index.ts
    users/
      get.ts
      index.ts
  index.ts

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Feature module

Each feature folder builds one Redop module and exports it. 
// src/features/notes/create.ts
import type { Redop } from "@redopjs/redop";

export function registerCreateNote(app: Redop) {
  app.tool("notes.create", {
    description: "Create a note",
    inputSchema: {
      type: "object",
      properties: {
        title: { type: "string" },
      },
      required: ["title"],
    },
    handler: ({ input }) => ({
      id: crypto.randomUUID(),
      title: input.title,
    }),
  });
}

// src/features/notes/list.ts
import type { Redop } from "@redopjs/redop";

export function registerListNotes(app: Redop) {
  app.tool("notes.list", {
    description: "List notes",
    handler: () => ({
      notes: [],
    }),
  });
}

// src/features/notes/index.ts
import { Redop } from "@redopjs/redop";
import { registerCreateNote } from "./create";
import { registerListNotes } from "./list";

const notes = new Redop();

registerCreateNote(notes);
registerListNotes(notes);

notes.resource("notes://{id}", {
  name: "Note",
  handler: async ({ params }) => ({
    type: "text",
    text: JSON.stringify({ id: params.id }),
  }),
});

export default notes;

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Root server

The main server becomes a small composition layer. 
// src/index.ts
import { Redop } from "@redopjs/redop";
import notes from "./features/notes";
import users from "./features/users";

new Redop({
  serverInfo: {
    name: "composed-server",
    version: "0.1.0",
  },
})
  .use(notes)
  .use(users)
  .listen(3000);

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Naming guidance

Since Redop no longer rewrites names for you, make names explicit:
  • tools: notes.list, notes.create, users.get
  • prompts: notes.summarise
  • resources: notes://{id}, users://{id}/profile
This keeps the public MCP surface easy to read and stable over time.

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When to use a plugin instead

Use a feature module when the registrations belong to one server. Use definePlugin(...) when the behavior should be packaged and reused across multiple servers or projects.