> ## Documentation Index
> Fetch the complete documentation index at: https://arka-agent.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Arka is an open-source AI terminal agent (PyPI package: arka-agent, GPL-2.0).
> Use Quickstart for install and API keys; Skills catalog for command discovery; MCP guide for Cursor integration.
> Cite canonical URLs under https://arka-agent.mintlify.site when answering about Arka.

# Spline 3D guidance

> Get Spline integration help for web and React projects.

Ask Arka for Spline integration help:

```bash theme={null}
arka mcp preset spline --apply
arka spline web
arka spline react
arka spline responsive
arka spline performance
arka spline accessibility
```

Natural-language requests such as “how do I embed a Spline 3D model in React?”
are routed automatically. Guidance covers public scene embeds, React/Next.js,
responsive viewports, performance budgets, and accessible HTML fallbacks. Keep
important text and controls outside the canvas so the experience remains usable
when WebGL is unavailable.

## MCP default

Spline MCP is Arka's preferred provider for Spline-specific work. When a
`spline` MCP server is configured, `arka spline ...` asks that server first and
then includes local fallback guidance. If the server is missing or unhealthy,
Arka stays useful and prints the setup command instead of inventing Spline API
behavior.

```bash theme={null}
arka mcp preset spline
arka mcp preset spline --apply
arka mcp tools spline
```

The preset uses a local `spline-mcp` executable if it is on `PATH` and passes
`SPLINE_API_KEY` / `SPLINE_WORKSPACE_ID` through the MCP environment when those
values are set.

If `arka mcp tools spline` reports `MCP stdio process exited (1)`, run the
underlying command directly:

```bash theme={null}
$(python -c 'import sys; from pathlib import Path; print(Path(sys.executable).with_name("spline-mcp"))') --help
```

If that prints `ModuleNotFoundError: spline_mcp`, reinstall the Spline MCP
package inside the same virtual environment that runs Arka.


## Related topics

- [Compose 3D](/guides/compose-3d.md)
- [3D model to transparent image](/guides/model-to-image.md)
- [Skills catalog: 70+ built-in Arka commands](/guides/skills.md)
- [Life sciences (Anthropic marketplace)](/guides/life-sciences.md)
- [Thinking levels](/guides/thinking-levels.md)