Build Your Own Agent TUI

npm install openai

import OpenAI from "openai";
import * as readline from "readline";

const client = new OpenAI({
  baseURL: "https://opendunes.com/api/v1",
  apiKey: process.env.OPENDUNES_API_KEY,
});

const messages: { role: string; content: string }[] = [];
let paused = false;

async function streamTurn(userInput: string): Promise<string> {
  messages.push({ role: "user", content: userInput });

  process.stdout.write("\n\x1b[36mAssistant:\x1b[0m ");

  const stream = await client.chat.completions.create({
    model: "anthropic/claude-sonnet-5",
    messages,
    stream: true,
    max_tokens: 1024,
  });

  let fullContent = "";

  for await (const chunk of stream) {
    while (paused) {
      await new Promise((r) => setTimeout(r, 200));
    }

    const delta = chunk.choices[0]?.delta?.content ?? "";
    fullContent += delta;
    process.stdout.write(delta);

    if (chunk.choices[0]?.finish_reason === "stop") {
      process.stdout.write("\n");
    }
  }

  messages.push({ role: "assistant", content: fullContent });
  return fullContent;
}

async function main() {
  // Enter raw mode for single-keypress handling
  process.stdin.setRawMode(true);
  readline.emitKeypressEvents(process.stdin);

  process.stdin.on("keypress", (_, key) => {
    if (key.ctrl && key.name === "c") {
      process.stdout.write("\n\x1b[31mAborted.\x1b[0m\n");
      process.exit(0);
    }
    if (key.ctrl && key.name === "p") {
      paused = !paused;
      const status = paused ? "\x1b[33mPaused\x1b[0m" : "\x1b[32mResumed\x1b[0m";
      process.stdout.write(`\r${status}  \n`);
    }
  });

  printHeader();
  await runConversationLoop();
}

function printHeader() {
  process.stdout.write("\x1b[2J\x1b[H"); // clear screen
  process.stdout.write("\x1b[1m OpenDunes Agent TUI \x1b[0m\n");
  process.stdout.write("Ctrl+C: exit  |  Ctrl+P: pause/resume\n");
  process.stdout.write("─".repeat(60) + "\n\n");
}

async function runConversationLoop() {
  const rl = readline.createInterface({ input: process.stdin, output: process.stdout, terminal: false });
  // Disable raw mode temporarily for readline input
  process.stdin.setRawMode(false);

  const prompt = () =>
    new Promise<string>((resolve) => {
      process.stdout.write("\x1b[32mYou:\x1b[0m ");
      rl.once("line", (line) => resolve(line.trim()));
    });

  while (true) {
    process.stdin.setRawMode(false);
    const input = await prompt();
    if (!input) continue;

    process.stdin.setRawMode(true);
    await streamTurn(input);
    printStatusBar(messages.length);
  }
}

function printStatusBar(turnCount: number) {
  const bar = `\x1b[90m[turns: ${turnCount}  model: claude-sonnet-5  balance: check /dashboard]\x1b[0m`;
  process.stdout.write(bar + "\n");
}

main().catch(console.error);

OPENDUNES_API_KEY=sk-your-key node --loader ts-node/esm agent-tui.ts

npx tsc && OPENDUNES_API_KEY=sk-your-key node dist/agent-tui.js