@neeter/server

@neeter/server

A Hono server toolkit that puts a browser UI on the Claude Agent SDK. Manages multi-turn sessions, translates SDK messages into named SSE events, and handles tool-approval permissions — so your React client gets a clean event stream out of the box.

Part of the neeter toolkit.

Install

pnpm add @neeter/server

Peer dependencies:

{
  "@anthropic-ai/claude-agent-sdk": ">=0.2.0",
  "hono": ">=4.0.0"
}

Quick start

import { Hono } from "hono";
import { serve } from "@hono/node-server";
import {
  createAgentRouter,
  SessionManager,
  MessageTranslator,
} from "@neeter/server";

const sessions = new SessionManager(() => ({
  context: {},
  model: "claude-sonnet-4-5-20250929",
  systemPrompt: "You are a helpful assistant.",
  maxTurns: 50,
}));

const translator = new MessageTranslator();

const app = new Hono();
app.route("/", createAgentRouter({ sessions, translator }));

serve({ fetch: app.fetch, port: 3000 });

Multimodal messages

Send images alongside text via the messages endpoint:

// POST /api/sessions/:id/messages
{
  "content": [
    { "type": "text", "text": "Describe this image" },
    {
      "type": "image",
      "source": {
        "type": "base64",
        "media_type": "image/png",
        "data": "<base64>"
      }
    }
  ]
}

Plain { "text": "..." } payloads continue to work as before. See the Server Guide for details.

Examples

Example	Description
basic-chat	Minimal server + client setup
code-workbench	Per-session sandboxes, persistence, file checkpointing, custom events

Documentation

• Server Guide — endpoints, permissions, persistence, session context, sandbox hooks
• API Reference — all exports and types

License

MIT