Unity AI Splines

AI Splines is an extension for AI Game Developer (Unity-MCP) that exposes Unity Splines authoring to AI assistants through the Model Context Protocol. Create and edit splines, knots, and tangents with natural language.

It wraps com.unity.splines 2.8.4 and requires Unity 2022.3 or newer.

Installation

1. Install Unity-MCP in your Unity project.
2. Install this package via OpenUPM:

openupm add com.ivanmurzak.unity.mcp.splines

Or add it through the Unity-MCP plugin window's Extensions list.

Tools

Tool id	Description
splines-container-create	Create a GameObject with a SplineContainer (one empty spline)
splines-add-spline	Add another empty spline to a container
splines-add-knot	Append a knot to a spline
splines-insert-knot	Insert a knot at an index
splines-remove-knot	Remove a knot at an index
splines-set-knot	Set position / tangents / rotation of a knot
splines-set-tangent-mode	Set a knot's tangent mode (Linear/Continuous/Broken/AutoSmooth/Mirrored)
splines-set-closed	Toggle a spline's closed-loop flag
splines-evaluate	Evaluate position / tangent / up at normalized t
splines-list	List all SplineContainers in the scene
splines-get-knots	Read all knots of a spline
splines-get	Generic: serialize any Splines component via ReflectorNet
splines-modify	Generic: apply a SerializedMember diff to any Splines component

License

MIT © Ivan Murzak