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Kursach_StealthAction/.gemini/skills/splines-set-knot/SKILL.md

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name description metadata
splines-set-knot Set position, in/out tangents, and/or rotation of an existing knot in a spline. Only the fields you pass are changed; the rest are preserved.
generated-by
mcp-plugin-dotnet

Splines / Set Knot

Edit an existing knot in place. BezierKnot is a value type, so this reads the current knot, applies only the provided fields, and writes it back through the spline indexer (which rebuilds the cached curve).

Inputs

  • gameObjectRef — the GameObject hosting the SplineContainer (required).
  • knotIndex — the index of the knot to edit (required).
  • position — optional new local-space position.
  • tangentIn / tangentOut — optional new tangents.
  • rotation — optional new euler-degrees rotation.
  • splineIndex — which spline in the container (default 0).

Behavior

Reads the knot, overrides only the supplied fields, writes it back, marks the scene dirty, repaints, and returns the resulting knot summary. Runs on the Unity main thread.

How to Call

unity-mcp-cli run-tool splines-set-knot --input '{
  "gameObjectRef": "string_value",
  "knotIndex": 0,
  "position": "string_value",
  "tangentIn": "string_value",
  "tangentOut": "string_value",
  "rotation": "string_value",
  "splineIndex": 0
}'

For complex input (multi-line strings, code), save the JSON to a file and use:

unity-mcp-cli run-tool splines-set-knot --input-file args.json

Or pipe via stdin (recommended):

unity-mcp-cli run-tool splines-set-knot --input-file - <<'EOF'
{"param": "value"}
EOF

Troubleshooting

If unity-mcp-cli is not found, either install it globally (npm install -g unity-mcp-cli) or use npx unity-mcp-cli instead. Read the /unity-initial-setup skill for detailed installation instructions.

Input

Name Type Required Description
gameObjectRef any Yes Reference to the GameObject containing the SplineContainer component.
knotIndex integer Yes Index of the knot to edit (0..knotCount-1).
position any No New local-space position of the knot.
tangentIn any No New in tangent relative to the knot position.
tangentOut any No New out tangent relative to the knot position.
rotation any No New knot rotation in euler angles (degrees).
splineIndex integer No Index of the spline inside the container (default 0).

Input JSON Schema

{
  "type": "object",
  "properties": {
    "gameObjectRef": {
      "$ref": "#/$defs/AIGD.GameObjectRef"
    },
    "knotIndex": {
      "type": "integer"
    },
    "position": {
      "$ref": "#/$defs/UnityEngine.Vector3"
    },
    "tangentIn": {
      "$ref": "#/$defs/UnityEngine.Vector3"
    },
    "tangentOut": {
      "$ref": "#/$defs/UnityEngine.Vector3"
    },
    "rotation": {
      "$ref": "#/$defs/UnityEngine.Vector3"
    },
    "splineIndex": {
      "type": "integer"
    }
  },
  "$defs": {
    "UnityEngine.EntityId": {
      "type": "string",
      "pattern": "^[0-9]+$"
    },
    "System.Type": {
      "type": "string"
    },
    "AIGD.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "$ref": "#/$defs/UnityEngine.EntityId",
          "description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
        },
        "path": {
          "type": "string",
          "description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
        },
        "name": {
          "type": "string",
          "description": "Name of a GameObject in hierarchy. Priority: 3."
        },
        "assetType": {
          "$ref": "#/$defs/System.Type",
          "description": "Type of the asset."
        },
        "assetPath": {
          "type": "string",
          "description": "Path to the asset within the project. Starts with 'Assets/'"
        },
        "assetGuid": {
          "type": "string",
          "description": "Unique identifier for the asset."
        }
      },
      "required": [
        "instanceID"
      ],
      "description": "Find GameObject in opened Prefab or in the active Scene."
    },
    "UnityEngine.Vector3": {
      "type": "object",
      "properties": {
        "x": {
          "type": "number"
        },
        "y": {
          "type": "number"
        },
        "z": {
          "type": "number"
        }
      },
      "required": [
        "x",
        "y",
        "z"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "gameObjectRef",
    "knotIndex"
  ]
}

Output

Output JSON Schema

{
  "type": "object",
  "properties": {
    "result": {
      "$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.Tool_Splines-KnotMutationResponse"
    }
  },
  "$defs": {
    "AIGD.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "$ref": "#/$defs/UnityEngine.EntityId",
          "description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
        },
        "path": {
          "type": "string",
          "description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
        },
        "name": {
          "type": "string",
          "description": "Name of a GameObject in hierarchy. Priority: 3."
        },
        "assetType": {
          "$ref": "#/$defs/System.Type",
          "description": "Type of the asset."
        },
        "assetPath": {
          "type": "string",
          "description": "Path to the asset within the project. Starts with 'Assets/'"
        },
        "assetGuid": {
          "type": "string",
          "description": "Unique identifier for the asset."
        }
      },
      "required": [
        "instanceID"
      ],
      "description": "Find GameObject in opened Prefab or in the active Scene."
    },
    "UnityEngine.EntityId": {
      "type": "string",
      "pattern": "^[0-9]+$"
    },
    "System.Type": {
      "type": "string"
    },
    "AIGD.ComponentRef": {
      "type": "object",
      "properties": {
        "index": {
          "type": "integer",
          "description": "Component 'index' attached to a gameObject. The first index is '0' and that is usually Transform or RectTransform. Priority: 2. Default value is -1."
        },
        "typeName": {
          "type": "string",
          "description": "Component type full name. Sample 'UnityEngine.Transform'. If the gameObject has two components of the same type, the output component is unpredictable. Priority: 3. Default value is null."
        },
        "instanceID": {
          "$ref": "#/$defs/UnityEngine.EntityId",
          "description": "instanceID of the UnityEngine.Object. If this is '0', then it will be used as 'null'."
        }
      },
      "required": [
        "index",
        "instanceID"
      ],
      "description": "Component reference. Used to find a Component at GameObject."
    },
    "com.IvanMurzak.Unity.MCP.Editor.API.Tool_Splines-KnotInfo": {
      "type": "object",
      "properties": {
        "index": {
          "type": "integer",
          "description": "Index of the knot inside the spline."
        },
        "position": {
          "$ref": "#/$defs/UnityEngine.Vector3",
          "description": "Local-space position of the knot."
        },
        "tangentIn": {
          "$ref": "#/$defs/UnityEngine.Vector3",
          "description": "In tangent (relative to the knot position)."
        },
        "tangentOut": {
          "$ref": "#/$defs/UnityEngine.Vector3",
          "description": "Out tangent (relative to the knot position)."
        },
        "rotationEuler": {
          "$ref": "#/$defs/UnityEngine.Vector3",
          "description": "Knot rotation in euler angles (degrees)."
        },
        "tangentMode": {
          "type": "string",
          "description": "Tangent mode of the knot."
        }
      },
      "required": [
        "index",
        "position",
        "tangentIn",
        "tangentOut",
        "rotationEuler"
      ]
    },
    "UnityEngine.Vector3": {
      "type": "object",
      "properties": {
        "x": {
          "type": "number"
        },
        "y": {
          "type": "number"
        },
        "z": {
          "type": "number"
        }
      },
      "required": [
        "x",
        "y",
        "z"
      ],
      "additionalProperties": false
    },
    "com.IvanMurzak.Unity.MCP.Editor.API.Tool_Splines-KnotMutationResponse": {
      "type": "object",
      "properties": {
        "gameObjectRef": {
          "$ref": "#/$defs/AIGD.GameObjectRef",
          "description": "Reference to the SplineContainer GameObject."
        },
        "containerRef": {
          "$ref": "#/$defs/AIGD.ComponentRef",
          "description": "Reference to the SplineContainer component."
        },
        "splineIndex": {
          "type": "integer",
          "description": "Index of the affected spline in the container."
        },
        "knotIndex": {
          "type": "integer",
          "description": "Index of the affected knot in the spline (-1 when not applicable)."
        },
        "knotCount": {
          "type": "integer",
          "description": "Resulting number of knots in the spline."
        },
        "knot": {
          "$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.Tool_Splines-KnotInfo",
          "description": "Summary of the affected knot, when applicable."
        },
        "success": {
          "type": "boolean",
          "description": "Whether the operation succeeded."
        }
      },
      "required": [
        "splineIndex",
        "knotIndex",
        "knotCount",
        "success"
      ]
    }
  },
  "required": [
    "result"
  ]
}