kernelcad

Solve Sketch

solve_sketch

Read-only

Use this when you need to solve a 2D sketch constraint set. Solve a 2D sketch constraint set. Side-effect-free: pass { entities, constraints } and receive solved entities plus the original constraints. Entities are POINT, LINE, and CIRCLE records; constraints use the kernelCAD constraint vocabulary.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`entities`	Yes	Sketch entities to solve. Lines reference point ids; circles reference a center point id.
`constraints`	Yes	Constraints to apply to the entities.

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 11, 2026

removedOutput schema / properties

Removed value: -{
-  "constraints": {
-    "description": "The constraints applied.",
-    "items": {
-      "additionalProperties": true,
-      "type": "object"
-    },
-    "type": "array"
-  },
-  "converged": {
-    "description": "Whether the constraint solve converged below tolerance. ok is false when this is false.",
-    "type": "boolean"
-  },
-  "entities": {
-    "description": "Solved sketch entities (best-effort on a non-converging solve).",
-    "items": {
-      "additionalProperties": true,
-      "type": "object"
-    },
-    "type": "array"
-  },
-  "errors": {
-    "description": "Solver/validation errors (present on failure, including non-convergence).",
-    "items": {
-      "additionalProperties": true,
-      "type": "object"
-    },
-    "type": "array"
-  },
-  "ok": {
-    "type": "boolean"
-  },
-  "residual": {
-    "description": "Final aggregate constraint residual when the solver ran.",
-    "type": "number"
-  }
-}

removedOutput schema / required

Removed value: -[
-  "ok",
-  "entities",
-  "constraints"
-]

Changed4 schema fields changedSep 21, 2026

addedOutput schema / properties / converged

Added value: +{
+  "description": "Whether the constraint solve converged below tolerance. ok is false when this is false.",
+  "type": "boolean"
+}

changedOutput schema / properties / entities / description

Previous value: -"Solved sketch entities."New value: +"Solved sketch entities (best-effort on a non-converging solve)."

changedOutput schema / properties / errors / description

Previous value: -"Solver errors (present on failure)."New value: +"Solver/validation errors (present on failure, including non-convergence)."

addedOutput schema / properties / residual

Added value: +{
+  "description": "Final aggregate constraint residual when the solver ran.",
+  "type": "number"
+}

Changed4 schema fields changedJun 19, 2026

addedInput schema / properties / constraints / items / properties

Added value: +{
+  "entities": {
+    "description": "Ids of the entities the constraint relates.",
+    "items": {
+      "type": "string"
+    },
+    "type": "array"
+  },
+  "id": {
+    "type": "string"
+  },
+  "type": {
+    "enum": [
+      "COINCIDENT",
+      "DISTANCE",
+      "HORIZONTAL",
+      "VERTICAL",
+      "PARALLEL",
+      "PERPENDICULAR",
+      "EQUAL_LENGTH",
+      "TANGENT",
+      "RADIUS",
+      "ANGLE",
+      "CONCENTRIC",
+      "SYMMETRIC"
+    ],
+    "type": "string"
+  },
+  "value": {
+    "description": "Required for DISTANCE, RADIUS, and ANGLE.",
+    "type": "number"
+  }
+}

addedInput schema / properties / constraints / items / required
```
Added value: +[
+  "id",
+  "type",
+  "entities"
+]
```

addedInput schema / properties / entities / items / oneOf

Added value: +[
+  {
+    "description": "POINT — a 2D point.",
+    "properties": {
+      "fixed": {
+        "description": "If true, the solver won't move this point.",
+        "type": "boolean"
+      },
+      "id": {
+        "type": "string"
+      },
+      "type": {
+        "enum": [
+          "POINT"
+        ],
+        "type": "string"
+      },
+      "x": {
+        "type": "number"
+      },
+      "y": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "id",
+      "type",
+      "x",
+      "y"
+    ],
+    "type": "object"
+  },
+  {
+    "description": "LINE — references two point ids.",
+    "properties": {
+      "id": {
+        "type": "string"
+      },
+      "p1": {
+        "type": "string"
+      },
+      "p2": {
+        "type": "string"
+      },
+      "type": {
+        "enum": [
+          "LINE"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "id",
+      "type",
+      "p1",
+      "p2"
+    ],
+    "type": "object"
+  },
+  {
+    "description": "CIRCLE — references a center point id.",
+    "properties": {
+      "center": {
+        "type": "string"
+      },
+      "id": {
+        "type": "string"
+      },
+      "radius": {
+        "type": "number"
+      },
+      "type": {
+        "enum": [
+          "CIRCLE"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "id",
+      "type",
+      "center",
+      "radius"
+    ],
+    "type": "object"
+  }
+]

removedInput schema / properties / entities / items / type
```
Removed value: -"object"
```

Changed4 schema fields changedJun 19, 2026

removedInput schema / properties / constraints / items / properties

Removed value: -{
-  "entities": {
-    "description": "Ids of the entities the constraint relates.",
-    "items": {
-      "type": "string"
-    },
-    "type": "array"
-  },
-  "id": {
-    "type": "string"
-  },
-  "type": {
-    "enum": [
-      "COINCIDENT",
-      "DISTANCE",
-      "HORIZONTAL",
-      "VERTICAL",
-      "PARALLEL",
-      "PERPENDICULAR",
-      "EQUAL_LENGTH",
-      "TANGENT",
-      "RADIUS",
-      "ANGLE",
-      "CONCENTRIC",
-      "SYMMETRIC"
-    ],
-    "type": "string"
-  },
-  "value": {
-    "description": "Required for DISTANCE, RADIUS, and ANGLE.",
-    "type": "number"
-  }
-}

removedInput schema / properties / constraints / items / required
```
Removed value: -[
-  "id",
-  "type",
-  "entities"
-]
```

removedInput schema / properties / entities / items / oneOf

Removed value: -[
-  {
-    "description": "POINT — a 2D point.",
-    "properties": {
-      "fixed": {
-        "description": "If true, the solver won't move this point.",
-        "type": "boolean"
-      },
-      "id": {
-        "type": "string"
-      },
-      "type": {
-        "enum": [
-          "POINT"
-        ],
-        "type": "string"
-      },
-      "x": {
-        "type": "number"
-      },
-      "y": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "id",
-      "type",
-      "x",
-      "y"
-    ],
-    "type": "object"
-  },
-  {
-    "description": "LINE — references two point ids.",
-    "properties": {
-      "id": {
-        "type": "string"
-      },
-      "p1": {
-        "type": "string"
-      },
-      "p2": {
-        "type": "string"
-      },
-      "type": {
-        "enum": [
-          "LINE"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "id",
-      "type",
-      "p1",
-      "p2"
-    ],
-    "type": "object"
-  },
-  {
-    "description": "CIRCLE — references a center point id.",
-    "properties": {
-      "center": {
-        "type": "string"
-      },
-      "id": {
-        "type": "string"
-      },
-      "radius": {
-        "type": "number"
-      },
-      "type": {
-        "enum": [
-          "CIRCLE"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "id",
-      "type",
-      "center",
-      "radius"
-    ],
-    "type": "object"
-  }
-]

addedInput schema / properties / entities / items / type
```
Added value: +"object"
```

Changed4 schema fields changedJun 15, 2026

addedInput schema / properties / constraints / items / properties

Added value: +{
+  "entities": {
+    "description": "Ids of the entities the constraint relates.",
+    "items": {
+      "type": "string"
+    },
+    "type": "array"
+  },
+  "id": {
+    "type": "string"
+  },
+  "type": {
+    "enum": [
+      "COINCIDENT",
+      "DISTANCE",
+      "HORIZONTAL",
+      "VERTICAL",
+      "PARALLEL",
+      "PERPENDICULAR",
+      "EQUAL_LENGTH",
+      "TANGENT",
+      "RADIUS",
+      "ANGLE",
+      "CONCENTRIC",
+      "SYMMETRIC"
+    ],
+    "type": "string"
+  },
+  "value": {
+    "description": "Required for DISTANCE, RADIUS, and ANGLE.",
+    "type": "number"
+  }
+}

addedInput schema / properties / constraints / items / required
```
Added value: +[
+  "id",
+  "type",
+  "entities"
+]
```

addedInput schema / properties / entities / items / oneOf

Added value: +[
+  {
+    "description": "POINT — a 2D point.",
+    "properties": {
+      "fixed": {
+        "description": "If true, the solver won't move this point.",
+        "type": "boolean"
+      },
+      "id": {
+        "type": "string"
+      },
+      "type": {
+        "enum": [
+          "POINT"
+        ],
+        "type": "string"
+      },
+      "x": {
+        "type": "number"
+      },
+      "y": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "id",
+      "type",
+      "x",
+      "y"
+    ],
+    "type": "object"
+  },
+  {
+    "description": "LINE — references two point ids.",
+    "properties": {
+      "id": {
+        "type": "string"
+      },
+      "p1": {
+        "type": "string"
+      },
+      "p2": {
+        "type": "string"
+      },
+      "type": {
+        "enum": [
+          "LINE"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "id",
+      "type",
+      "p1",
+      "p2"
+    ],
+    "type": "object"
+  },
+  {
+    "description": "CIRCLE — references a center point id.",
+    "properties": {
+      "center": {
+        "type": "string"
+      },
+      "id": {
+        "type": "string"
+      },
+      "radius": {
+        "type": "number"
+      },
+      "type": {
+        "enum": [
+          "CIRCLE"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "id",
+      "type",
+      "center",
+      "radius"
+    ],
+    "type": "object"
+  }
+]

removedInput schema / properties / entities / items / type
```
Removed value: -"object"
```

Changed1 schema field changedJun 15, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "properties": {
+    "constraints": {
+      "description": "The constraints applied.",
+      "items": {
+        "additionalProperties": true,
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "entities": {
+      "description": "Solved sketch entities.",
+      "items": {
+        "additionalProperties": true,
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "errors": {
+      "description": "Solver errors (present on failure).",
+      "items": {
+        "additionalProperties": true,
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "ok": {
+      "type": "boolean"
+    }
+  },
+  "required": [
+    "ok",
+    "entities",
+    "constraints"
+  ],
+  "type": "object"
+}

First observedMay 25, 2026

TDQS

Score is being calculated.

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