kernelcad

Add Mate

add_mate

Use this when you need to author a mate-graph relationship into the source, selected by relation (default 'mate'):

'mate' — a typed mate between two connectors ({ name, a, b, type, pose?, limitsDeg?, limitsMm? }).
'coupling' — couple a driven mate to a source mate by ratio ({ driven, source, ratio, offset? }).
'transmission' — a physical drive path across mates ({ name, kind, sourceMate, drivenMates, path, ... }). All durably edit source and need { code, assembly_binding }. Params other than relation are forwarded verbatim; each relation fails closed on its own missing required params.

Input Schema

TableJSON Schema

Name	Required	Description
`a`	No	relation:'mate' — connector ref "<partName>.<connectorName>".
`b`	No	relation:'mate' — connector ref "<partName>.<connectorName>".
`code`	Yes	The .kcad.ts source code.
`kind`	No	relation:'transmission' — transmission kind.
`name`	No	relation:'mate'\|'transmission' — name unique within the assembly.
`path`	No	relation:'transmission' — drive path.
`pose`	No	relation:'mate' — optional mate pose.
`type`	No	relation:'mate' — mate type.
`input`	No	relation:'transmission' — optional input.
`notes`	No	relation:'transmission' — optional notes.
`ratio`	No	relation:'coupling' — driven pose = source pose * ratio + offset.
`driven`	No	relation:'coupling' — driven mate name.
`offset`	No	relation:'coupling' — optional pose offset.
`output`	No	relation:'transmission' — optional output.
`source`	No	relation:'coupling' — source mate name.
`actuator`	No	relation:'transmission' — optional actuator.
`limitsMm`	No	relation:'mate' — optional [minMm, maxMm].
`relation`	No	Which relationship to author (default 'mate').
`limitsDeg`	No	relation:'mate' — optional [minDeg, maxDeg].
`sourceMate`	No	relation:'transmission' — source mate name.
`drivenMates`	No	relation:'transmission' — driven mate names.
`assembly_binding`	Yes	JS identifier bound to assembly(...).

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: -{
-  "binding_name": {
-    "description": "JS const name bound to the new construct (when one was created).",
-    "type": "string"
-  },
-  "diagnostics": {
-    "description": "Diagnostics from re-evaluating the modified source.",
-    "items": {
-      "additionalProperties": true,
-      "type": "object"
-    },
-    "type": "array"
-  },
-  "error": {
-    "description": "Failure message (present when ok is false).",
-    "type": "string"
-  },
-  "new_code": {
-    "description": "Modified .kcad.ts source (present on success). Caller persists it.",
-    "type": "string"
-  },
-  "ok": {
-    "description": "Whether the edit applied and re-evaluated cleanly.",
-    "type": "boolean"
-  }
-}

removedOutput schema / required
```
Removed value: -[
-  "ok"
-]
```

Changed1 schema field changedJul 18, 2026

changedInput schema / allOf

Previous value: -[
-  {
-    "if": {
-      "properties": {
-        "relation": {
-          "const": "coupling"
-        }
-      },
-      "required": [
-        "relation"
-      ]
-    },
-    "then": {
-      "required": [
-        "driven",
-        "source",
-        "ratio"
-      ]
-    }
-  },
-  {
-    "if": {
-      "properties": {
-        "relation": {
-          "const": "transmission"
-        }
-      },
-      "required": [
-        "relation"
-      ]
-    },
-    "then": {
-      "required": [
-        "name",
-        "kind",
-        "sourceMate",
-        "drivenMates",
-        "path"
-      ]
-    }
-  },
-  {
-    "else": {
-      "required": [
-        "name",
-        "a",
-        "b",
-        "type"
-      ]
-    },
-    "if": {
-      "properties": {
-        "relation": {
-          "enum": [
-            "coupling",
-            "transmission"
-          ]
-        }
-      },
-      "required": [
-        "relation"
-      ]
-    },
-    "then": {}
-  }
-]New value: +[
+  {
+    "if": {
+      "anyOf": [
+        {
+          "not": {
+            "required": [
+              "relation"
+            ]
+          }
+        },
+        {
+          "properties": {
+            "relation": {
+              "const": "mate"
+            }
+          },
+          "required": [
+            "relation"
+          ]
+        }
+      ]
+    },
+    "then": {
+      "required": [
+        "name",
+        "a",
+        "b",
+        "type"
+      ]
+    }
+  },
+  {
+    "if": {
+      "properties": {
+        "relation": {
+          "const": "coupling"
+        }
+      },
+      "required": [
+        "relation"
+      ]
+    },
+    "then": {
+      "required": [
+        "driven",
+        "source",
+        "ratio"
+      ]
+    }
+  },
+  {
+    "if": {
+      "properties": {
+        "relation": {
+          "const": "transmission"
+        }
+      },
+      "required": [
+        "relation"
+      ]
+    },
+    "then": {
+      "required": [
+        "name",
+        "kind",
+        "sourceMate",
+        "drivenMates",
+        "path"
+      ]
+    }
+  }
+]

Changed1 schema field changedJun 19, 2026

addedInput schema / allOf

Added value: +[
+  {
+    "if": {
+      "properties": {
+        "relation": {
+          "const": "coupling"
+        }
+      },
+      "required": [
+        "relation"
+      ]
+    },
+    "then": {
+      "required": [
+        "driven",
+        "source",
+        "ratio"
+      ]
+    }
+  },
+  {
+    "if": {
+      "properties": {
+        "relation": {
+          "const": "transmission"
+        }
+      },
+      "required": [
+        "relation"
+      ]
+    },
+    "then": {
+      "required": [
+        "name",
+        "kind",
+        "sourceMate",
+        "drivenMates",
+        "path"
+      ]
+    }
+  },
+  {
+    "else": {
+      "required": [
+        "name",
+        "a",
+        "b",
+        "type"
+      ]
+    },
+    "if": {
+      "properties": {
+        "relation": {
+          "enum": [
+            "coupling",
+            "transmission"
+          ]
+        }
+      },
+      "required": [
+        "relation"
+      ]
+    },
+    "then": {}
+  }
+]

Changed1 schema field changedJun 19, 2026

removedInput schema / allOf

Removed value: -[
-  {
-    "if": {
-      "properties": {
-        "relation": {
-          "const": "coupling"
-        }
-      },
-      "required": [
-        "relation"
-      ]
-    },
-    "then": {
-      "required": [
-        "driven",
-        "source",
-        "ratio"
-      ]
-    }
-  },
-  {
-    "if": {
-      "properties": {
-        "relation": {
-          "const": "transmission"
-        }
-      },
-      "required": [
-        "relation"
-      ]
-    },
-    "then": {
-      "required": [
-        "name",
-        "kind",
-        "sourceMate",
-        "drivenMates",
-        "path"
-      ]
-    }
-  },
-  {
-    "else": {
-      "required": [
-        "name",
-        "a",
-        "b",
-        "type"
-      ]
-    },
-    "if": {
-      "properties": {
-        "relation": {
-          "enum": [
-            "coupling",
-            "transmission"
-          ]
-        }
-      },
-      "required": [
-        "relation"
-      ]
-    },
-    "then": {}
-  }
-]

Changed1 schema field changedJun 15, 2026

addedInput schema / allOf

Added value: +[
+  {
+    "if": {
+      "properties": {
+        "relation": {
+          "const": "coupling"
+        }
+      },
+      "required": [
+        "relation"
+      ]
+    },
+    "then": {
+      "required": [
+        "driven",
+        "source",
+        "ratio"
+      ]
+    }
+  },
+  {
+    "if": {
+      "properties": {
+        "relation": {
+          "const": "transmission"
+        }
+      },
+      "required": [
+        "relation"
+      ]
+    },
+    "then": {
+      "required": [
+        "name",
+        "kind",
+        "sourceMate",
+        "drivenMates",
+        "path"
+      ]
+    }
+  },
+  {
+    "else": {
+      "required": [
+        "name",
+        "a",
+        "b",
+        "type"
+      ]
+    },
+    "if": {
+      "properties": {
+        "relation": {
+          "enum": [
+            "coupling",
+            "transmission"
+          ]
+        }
+      },
+      "required": [
+        "relation"
+      ]
+    },
+    "then": {}
+  }
+]

Changed1 schema field changedJun 15, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "properties": {
+    "binding_name": {
+      "description": "JS const name bound to the new construct (when one was created).",
+      "type": "string"
+    },
+    "diagnostics": {
+      "description": "Diagnostics from re-evaluating the modified source.",
+      "items": {
+        "additionalProperties": true,
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "error": {
+      "description": "Failure message (present when ok is false).",
+      "type": "string"
+    },
+    "new_code": {
+      "description": "Modified .kcad.ts source (present on success). Caller persists it.",
+      "type": "string"
+    },
+    "ok": {
+      "description": "Whether the edit applied and re-evaluated cleanly.",
+      "type": "boolean"
+    }
+  },
+  "required": [
+    "ok"
+  ],
+  "type": "object"
+}

Changed26 schema fields changedJun 13, 2026

changedInput schema / properties / a / description

Previous value: -"Connector ref: \"<partName>.<connectorName>\" (legacy) or \"@kc[<partName>/connector/<connectorName>]\"."New value: +"relation:'mate' — connector ref \"<partName>.<connectorName>\"."

addedInput schema / properties / actuator

Added value: +{
+  "description": "relation:'transmission' — optional actuator.",
+  "type": "string"
+}

removedInput schema / properties / assembly

Removed value: -{
-  "type": "string"
-}

addedInput schema / properties / assembly_binding

Added value: +{
+  "description": "JS identifier bound to assembly(...).",
+  "type": "string"
+}

changedInput schema / properties / b / description

Previous value: -"Connector ref: \"<partName>.<connectorName>\" (legacy) or \"@kc[<partName>/connector/<connectorName>]\"."New value: +"relation:'mate' — connector ref \"<partName>.<connectorName>\"."

addedInput schema / properties / code

Added value: +{
+  "description": "The .kcad.ts source code.",
+  "type": "string"
+}

addedInput schema / properties / driven

Added value: +{
+  "description": "relation:'coupling' — driven mate name.",
+  "type": "string"
+}

addedInput schema / properties / drivenMates

Added value: +{
+  "description": "relation:'transmission' — driven mate names.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

addedInput schema / properties / input

Added value: +{
+  "description": "relation:'transmission' — optional input.",
+  "type": "string"
+}

addedInput schema / properties / kind

Added value: +{
+  "description": "relation:'transmission' — transmission kind.",
+  "enum": [
+    "direct-horn",
+    "link-rod",
+    "four-bar",
+    "gear-pair",
+    "belt",
+    "tendon"
+  ],
+  "type": "string"
+}

changedInput schema / properties / limitsDeg / description

Previous value: -"Optional [minDeg, maxDeg] range for revolute/cylindrical/pin_slot mates."New value: +"relation:'mate' — optional [minDeg, maxDeg]."

addedInput schema / properties / limitsDeg / items
```
Added value: +{
+  "type": "number"
+}
```

changedInput schema / properties / limitsMm / description

Previous value: -"Optional [minMm, maxMm] range for prismatic mates."New value: +"relation:'mate' — optional [minMm, maxMm]."

addedInput schema / properties / limitsMm / items
```
Added value: +{
+  "type": "number"
+}
```

changedInput schema / properties / name / description

Previous value: -"Mate name (unique within the assembly)."New value: +"relation:'mate'|'transmission' — name unique within the assembly."

addedInput schema / properties / notes

Added value: +{
+  "description": "relation:'transmission' — optional notes.",
+  "type": "string"
+}

addedInput schema / properties / offset

Added value: +{
+  "description": "relation:'coupling' — optional pose offset.",
+  "type": "number"
+}

addedInput schema / properties / output

Added value: +{
+  "description": "relation:'transmission' — optional output.",
+  "type": "string"
+}

addedInput schema / properties / path

Added value: +{
+  "description": "relation:'transmission' — drive path.",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

changedInput schema / properties / pose / description

Previous value: -"Optional mate pose: number for scalar mates or [x, y, z] degrees for ball mates."New value: +"relation:'mate' — optional mate pose."

addedInput schema / properties / ratio

Added value: +{
+  "description": "relation:'coupling' — driven pose = source pose * ratio + offset.",
+  "type": "number"
+}

addedInput schema / properties / relation

Added value: +{
+  "description": "Which relationship to author (default 'mate').",
+  "enum": [
+    "mate",
+    "coupling",
+    "transmission"
+  ],
+  "type": "string"
+}

addedInput schema / properties / source

Added value: +{
+  "description": "relation:'coupling' — source mate name.",
+  "type": "string"
+}

addedInput schema / properties / sourceMate

Added value: +{
+  "description": "relation:'transmission' — source mate name.",
+  "type": "string"
+}

addedInput schema / properties / type / description
```
Added value: +"relation:'mate' — mate type."
```

changedInput schema / required

Previous value: -[
-  "name",
-  "a",
-  "b",
-  "type"
-]New value: +[
+  "code",
+  "assembly_binding"
+]

Changed2 schema fields changedJun 7, 2026

changedInput schema / properties / a / description

Previous value: -"Connector ref \"<partName>.<connectorName>\"."New value: +"Connector ref: \"<partName>.<connectorName>\" (legacy) or \"@kc[<partName>/connector/<connectorName>]\"."

changedInput schema / properties / b / description

Previous value: -"Connector ref \"<partName>.<connectorName>\"."New value: +"Connector ref: \"<partName>.<connectorName>\" (legacy) or \"@kc[<partName>/connector/<connectorName>]\"."

First observedMay 25, 2026

TDQS

Score is being calculated.

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