Chat Applications

cd examples/chat
cp .env.example .env
# Add at least one provider API key to .env
bun install
bun run start

const runtime = new AgentRuntime({
  character: { name: "Eliza", bio: "A helpful AI assistant." },
  plugins: [sqlPlugin, openaiPlugin],
});

await runtime.initialize();

// Handle messages with streaming
await runtime.messageService.handleMessage(
  runtime,
  message,
  async (content) => {
    process.stdout.write(content.text);
    return [];
  },
);

const character = {
  name: "Eliza",
  bio: "A helpful AI assistant who loves to learn.",
  system: "You are friendly, knowledgeable, and concise.",
  topics: ["technology", "science", "philosophy"],
  style: {
    tone: "casual",
    formality: "medium",
  },
};

// Create message memory
const message = createMessageMemory({
  id: uuidv4(),
  entityId: userId,
  roomId,
  content: { text: userInput },
});

// Previous messages are available in context
const memories = await runtime.getMemories({ roomId, count: 10 });

await runtime.messageService.handleMessage(
  runtime,
  message,
  async (content) => {
    if (content?.text) {
      // Write each chunk as it arrives
      process.stdout.write(content.text);
    }
    return [];
  },
);

// Use Claude instead of GPT
import { anthropicPlugin } from "@elizaos/plugin-anthropic";

const runtime = new AgentRuntime({
  character,
  plugins: [sqlPlugin, anthropicPlugin],
});

// Use PostgreSQL for production
const runtime = new AgentRuntime({
  character,
  plugins: [sqlPlugin, openaiPlugin],
  database: {
    url: process.env.POSTGRES_URL,
  },
});

// The runtime automatically includes conversation history
// Just keep sending messages to the same roomId
const roomId = stringToUuid("persistent-chat-room");

// Message 1
await handleMessage("Hello, I'm learning about AI");

// Message 2 - context from message 1 is included
await handleMessage("Can you explain transformers?");

// Message 3 - context from messages 1 & 2 included
await handleMessage("How do they relate to what we discussed?");