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

# Agent skills

> Install Cartesia Agent Skills in your editor—curated guides so coding agents apply the right Cartesia authentication, versioning, and product boundaries out of the box.

**Agent Skills** are installable [`SKILL.md`](https://agentskills.io/home) guides (plus optional references) for **coding agents** in Cursor, Claude Code, and similar clients. Cartesia’s official pack is **[cartesia-ai/skills](https://github.com/cartesia-ai/skills)**.

Not using skills? Copy the prompt from the [AI agent guide](/tools/ai/agent-guide) into your editor rules instead.

## Install

```bash theme={null}
npx skills add cartesia-ai/skills
```

When prompted, choose **cartesia-api** and/or **line-voice-agent** (you can add both).

**Before you start**

* **API / app work:** A Cartesia API key from [play.cartesia.ai/keys](https://play.cartesia.ai/keys).
* **Cartesia Line:** Same Cartesia key plus an LLM provider key; the [Line quickstart](/line/start-building/quickstart) walks through setup and `cartesia deploy`.

## Which skill?

| Choose               | When                                                                                                                                                                                                                                      |
| -------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **cartesia-api**     | You call **REST or WebSocket** APIs (Sonic, Ink, voices), use the [Python](https://github.com/cartesia-ai/cartesia-python) or [JS/TS](https://github.com/cartesia-ai/cartesia-js) SDKs, or wire optional [MCP](/tools/ai/mcp) in the IDE. |
| **line-voice-agent** | You build **Cartesia Line** agents: `cartesia` CLI, `VoiceAgentApp`, telephony, tools, and handoffs.                                                                                                                                      |

## Related

* [AI agent guide](/tools/ai/agent-guide) — canonical rules and copy-paste prompt (what the skills enforce).
* [MCP](/tools/ai/mcp) — optional IDE integration; not a replacement for REST/SDKs in shipped apps.
* [`llms.txt`](/tools/ai/llms-txt) — machine-readable docs index for agents.