> ## Documentation Index
> Fetch the complete documentation index at: https://doc.featherhq.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Feather: AI-Powered Customer Experience API

> Feather is a unified customer experience platform. Build AI agents, ingest knowledge, run conversations across voice, SMS, and email — all through one API.

Feather gives you a complete API to build and deploy AI-powered customer experience workflows. Create intelligent agents backed by your knowledge base, run conversations across every channel, and continuously evaluate and improve performance — all from a single, unified platform.

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart">
    Make your first API call and run your first conversation in under 5 minutes.
  </Card>

  <Card title="Authentication" icon="key" href="/authentication">
    Learn how to create API keys and authenticate every request.
  </Card>

  <Card title="Build an Agent" icon="robot" href="/guides/build-your-first-agent">
    Create your first AI agent with a knowledge base and custom tools.
  </Card>

  <Card title="API Reference" icon="code" href="/api-reference/identity/get-the-current-callers-identity-role-and-kb-clearance">
    Explore all endpoints, parameters, and response shapes.
  </Card>
</CardGroup>

## What you can build

Feather's platform API covers the full stack of customer experience automation:

<CardGroup cols={3}>
  <Card title="AI Agents" icon="brain" href="/concepts/agents">
    Create versioned agents with system prompts, knowledge bases, tools, and policies.
  </Card>

  <Card title="Knowledge Bases" icon="database" href="/concepts/knowledge-bases">
    Ingest documents from files, URLs, Notion, Google Drive, and S3 — then search semantically.
  </Card>

  <Card title="Multi-Channel" icon="comments" href="/concepts/conversations">
    Handle conversations over voice, SMS, email, and API in a unified session model.
  </Card>

  <Card title="Voice Calls" icon="phone" href="/guides/voice-calls">
    Build outbound and inbound voice agents with STT/TTS, warm transfers, and voicemail detection.
  </Card>

  <Card title="Integrations" icon="plug" href="/guides/connect-an-integration">
    Connect Slack, Notion, Twilio, and custom MCP servers to give agents real-world tools.
  </Card>

  <Card title="Evaluations" icon="chart-bar" href="/guides/evaluations">
    Run simulation suites and model-judge evaluators to measure and improve agent quality.
  </Card>
</CardGroup>

## How it works

<Steps>
  <Step title="Authenticate">
    Create an API key in your organization settings. Include it as `x-api-key: <key>` on every request.
  </Step>

  <Step title="Create an agent">
    `POST /v1/agents` with a name and system prompt. Add knowledge bases and custom tools to power its responses.
  </Step>

  <Step title="Start a conversation">
    `POST /v1/v2/conversations` to open a session, then `POST /v1/v2/conversations/{id}/turns` to send messages. Stream responses in real time with the `/turns/stream` endpoint.
  </Step>

  <Step title="Monitor and improve">
    Use built-in analytics, evaluators, and knowledge-gap detection to continuously improve your agents over time.
  </Step>
</Steps>

## Base URL

All API requests target the sandbox environment:

```
https://api-sandbox.featherhq.com
```

<Note>
  Contact Feather to provision your production environment credentials. All examples in these docs use the sandbox base URL.
</Note>