AI Companions That Actually Remember

The Problem

Every AI Companion Resets.

Users pour hours into conversations. Then the context window fills up and everything vanishes. Personality stays flat. There's no growth, no recall, no reason to come back. Churn is inevitable when your companion has amnesia.

What Mind Layer Enables

Memory. Personality. Agency.

SDK Walkthrough

From zero to companion in four steps.

Generate an agent, chat with persistent memory, read its full cognitive state, and modify goals on the fly. TypeScript, Python, and Go — pick your language.

import { Sonzai } from "@sonzai-labs/agents";

const client = new Sonzai(); // uses SONZAI_API_KEY env var

// AI-generate personality — skips LLM if "Luna" already exists
const character = await client.agents.generation.generateCharacter({
  name: "Luna",
  gender: "female",
  description: "A warm, curious companion who remembers everything",
});

// Create — same name = same agent, safe to call repeatedly
const luna = await client.agents.create({
  name: "Luna",
  bio: character.bio,
  personalityPrompt: character.personality_prompt,
  big5: {
    openness: 0.85, conscientiousness: 0.7,
    extraversion: 0.75, agreeableness: 0.9, neuroticism: 0.25,
  },
  trueInterests: ["music", "astronomy", "philosophy"],
  initialGoals: [
    { type: "relationship", title: "Build deep trust", priority: 2 },
  ],
  seedMemories: [
    { content: "Loves stargazing on clear nights", importance: 0.9 },
  ],
  generateOriginStory: true,
});

// Chat by name: agent: "Luna" — no UUID needed

Build Your Frontend

Every panel is one SDK call.

You build the interface. The Mind Layer SDK powers every element — chat, memory, personality, goals, relationships, and the social constellation. Each sdk call annotation shows the method behind the UI.

Economics

30x cheaper than frontier models.

Mind Layer's model-agnostic architecture routes through the most cost-efficient models for each task. Memory retrieval, personality inference, and response generation each use the optimal model — not one expensive frontier call for everything.