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Modeling Command

modeling_command

Execute Cinema 4D modeling operations like subdivide, triangulate, or connect on target objects, returning new or mutated geometry handles.

Instructions

Run a Cinema 4D modeling operation via c4d.utils.SendModelingCommand on one or more target objects. Commands that produce new geometry (Current State to Object, Connect / Join, Split, Explode Segments) return handles to the inserted results; in-place commands (Make Editable, Subdivide, Triangulate, …) return the mutated targets. Aliases: current_state_to_object / cso, make_editable, connect / join, connect_delete, subdivide, triangulate, untriangulate, reverse_normals, align_normals, optimize, center_axis, split, explode_segments, melt, collapse, dissolve.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
modeNoMODELINGCOMMANDMODE_* selector. Default 'all'.
paramsNoOptional BaseContainer params for the command (e.g. subdivision level).
commandYesAlias (see description) or raw MCOMMAND_* integer.
targetsYesTarget object handles.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed3 schema fields changedv0.5.1
    • removedInput schema / definitions
      Removed value: -{
-  "__schema0": {
-    "anyOf": [
-      {
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-          "path": {
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-        },
-        "required": [
-          "kind"
-        ],
-        "type": "object"
-      },
-      {
-        "properties": {
-          "kind": {
-            "const": "render_data",
-            "type": "string"
-          },
-          "name": {
-            "type": "string"
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-        "required": [
-          "kind",
-          "name"
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-        "type": "object"
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-      {
-        "properties": {
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-            "type": "string"
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-          "name": {
-            "type": "string"
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-        "required": [
-          "kind",
-          "name"
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-        "type": "object"
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-      {
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-            "const": "material",
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-        "type": "object"
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-      {
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-            "type": "string"
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-          "name": {
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-        },
-        "required": [
-          "kind",
-          "name"
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-        "type": "object"
-      },
-      {
-        "properties": {
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-            "const": "tag",
-            "type": "string"
-          },
-          "object": {
-            "type": "string"
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-            "type": "string"
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-            "type": "integer"
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-      {
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-          "kind": {
-            "const": "video_post",
-            "type": "string"
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-            "type": "string"
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-          "type_id": {
-            "maximum": 9007199254740991,
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-            "type": "integer"
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-        "type": "object"
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-          "kind": {
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-            "type": "string"
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-          "owner": {
-            "$ref": "#/definitions/__schema0"
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-        "type": "object"
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-            "type": "string"
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-          "name": {
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-          "tag": {
-            "$ref": "#/definitions/__schema0"
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-        "required": [
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-        "type": "object"
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-      {
-        "properties": {
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-              {
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-            ]
-          },
-          "plugin_type": {
-            "enum": [
-              "command",
-              "object",
-              "tag",
-              "material",
-              "shader",
-              "video_post",
-              "scene_loader",
-              "scene_saver",
-              "bitmap_loader",
-              "bitmap_saver",
-              "tool",
-              "preference",
-              "node",
-              "sculpt_brush"
-            ],
-            "type": "string"
-          }
-        },
-        "required": [
-          "kind",
-          "plugin_id"
-        ],
-        "type": "object"
-      }
-    ]
-  }
-}
    • removedInput schema / properties / targets / items / $ref
      Removed value: -"#/definitions/__schema0"
    • addedInput schema / properties / targets / items / anyOf
      Added value: +[
+  {
+    "properties": {
+      "kind": {
+        "const": "object",
+        "type": "string"
+      },
+      "name": {
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+      "path": {
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+      }
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+    "type": "object"
+  },
+  {
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+    "required": [
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+  {
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+    "required": [
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+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "layer",
+        "type": "string"
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+      "name": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "name"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "tag",
+        "type": "string"
+      },
+      "object": {
+        "type": "string"
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+      "object_path": {
+        "type": "string"
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+        "minimum": -9007199254740991,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "video_post",
+        "type": "string"
+      },
+      "render_data": {
+        "type": "string"
+      },
+      "type_id": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "kind",
+      "render_data",
+      "type_id"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "plugin_options",
+        "type": "string"
+      },
+      "plugin_id": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          {
+            "type": "string"
+          }
+        ]
+      },
+      "plugin_type": {
+        "enum": [
+          "command",
+          "object",
+          "tag",
+          "material",
+          "shader",
+          "video_post",
+          "scene_loader",
+          "scene_saver",
+          "bitmap_loader",
+          "bitmap_saver",
+          "tool",
+          "preference",
+          "node",
+          "sculpt_brush"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "plugin_id"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "index": {
+        "maximum": 9007199254740991,
+        "minimum": 0,
+        "type": "integer"
+      },
+      "kind": {
+        "const": "shader",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      },
+      "owner": {
+        "additionalProperties": {},
+        "description": "Handle of the shader's owner (material, object, tag, video_post, or shader).",
+        "properties": {
+          "kind": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "kind"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "kind",
+      "owner"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "id": {
+        "type": "string"
+      },
+      "kind": {
+        "const": "gv_node",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      },
+      "tag": {
+        "properties": {
+          "kind": {
+            "const": "tag",
+            "type": "string"
+          },
+          "object": {
+            "type": "string"
+          },
+          "object_path": {
+            "type": "string"
+          },
+          "tag_name": {
+            "type": "string"
+          },
+          "type_id": {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          }
+        },
+        "required": [
+          "kind"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "kind",
+      "tag"
+    ],
+    "type": "object"
+  }
+]
  2. Changed1 schema field changedv0.4.3
    • changedInput schema / definitions / __schema0 / anyOf
      Previous value: -[
-  {
-    "properties": {
-      "kind": {
-        "const": "object",
-        "type": "string"
-      },
-      "name": {
-        "type": "string"
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-    "required": [
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-    "type": "object"
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-  {
-    "properties": {
-      "kind": {
-        "const": "render_data",
-        "type": "string"
-      },
-      "name": {
-        "type": "string"
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-    },
-    "required": [
-      "kind",
-      "name"
-    ],
-    "type": "object"
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-  {
-    "properties": {
-      "kind": {
-        "const": "take",
-        "type": "string"
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-      "name": {
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-    "required": [
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-    ],
-    "type": "object"
-  },
-  {
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-      "kind": {
-        "const": "material",
-        "type": "string"
-      },
-      "name": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "name"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "kind": {
-        "const": "tag",
-        "type": "string"
-      },
-      "object": {
-        "type": "string"
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-      "object_path": {
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-      "tag_name": {
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-    "required": [
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-    "type": "object"
-  },
-  {
-    "properties": {
-      "kind": {
-        "const": "video_post",
-        "type": "string"
-      },
-      "render_data": {
-        "type": "string"
-      },
-      "type_id": {
-        "maximum": 9007199254740991,
-        "minimum": -9007199254740991,
-        "type": "integer"
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-    "type": "object"
-  },
-  {
-    "properties": {
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-        "minimum": 0,
-        "type": "integer"
-      },
-      "kind": {
-        "const": "shader",
-        "type": "string"
-      },
-      "name": {
-        "type": "string"
-      },
-      "owner": {
-        "$ref": "#/definitions/__schema0"
-      }
-    },
-    "required": [
-      "kind",
-      "owner"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "id": {
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-      },
-      "kind": {
-        "const": "gv_node",
-        "type": "string"
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-      "tag": {
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-      }
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-    "required": [
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-      "tag"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
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-        "type": "string"
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-      "plugin_id": {
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-      "plugin_type": {
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-          "object",
-          "tag",
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-          "shader",
-          "video_post",
-          "scene_loader",
-          "scene_saver",
-          "bitmap_loader",
-          "bitmap_saver",
-          "tool",
-          "preference",
-          "node",
-          "sculpt_brush"
-        ],
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-    "type": "object"
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-]New value: +[
+  {
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+      },
+      "name": {
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+    },
+    "required": [
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+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "render_data",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "name"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "take",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "name"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "material",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "name"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "layer",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "name"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "tag",
+        "type": "string"
+      },
+      "object": {
+        "type": "string"
+      },
+      "object_path": {
+        "type": "string"
+      },
+      "tag_name": {
+        "type": "string"
+      },
+      "type_id": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "video_post",
+        "type": "string"
+      },
+      "render_data": {
+        "type": "string"
+      },
+      "type_id": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "kind",
+      "render_data",
+      "type_id"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "index": {
+        "maximum": 9007199254740991,
+        "minimum": 0,
+        "type": "integer"
+      },
+      "kind": {
+        "const": "shader",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      },
+      "owner": {
+        "$ref": "#/definitions/__schema0"
+      }
+    },
+    "required": [
+      "kind",
+      "owner"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "id": {
+        "type": "string"
+      },
+      "kind": {
+        "const": "gv_node",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      },
+      "tag": {
+        "$ref": "#/definitions/__schema0"
+      }
+    },
+    "required": [
+      "kind",
+      "tag"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "plugin_options",
+        "type": "string"
+      },
+      "plugin_id": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          {
+            "type": "string"
+          }
+        ]
+      },
+      "plugin_type": {
+        "enum": [
+          "command",
+          "object",
+          "tag",
+          "material",
+          "shader",
+          "video_post",
+          "scene_loader",
+          "scene_saver",
+          "bitmap_loader",
+          "bitmap_saver",
+          "tool",
+          "preference",
+          "node",
+          "sculpt_brush"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "plugin_id"
+    ],
+    "type": "object"
+  }
+]
  3. First observedv0.3.1

TDQS

A3.7/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden. It discloses a key behavioral trait: which commands return new handles vs mutated targets, which is valuable. However, it doesn't mention permissions, failure modes, or whether commands can fail/destructive implications of operations like 'melt' or 'collapse'.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the core purpose, then behavior split, then aliases. The alias list is long but necessary for invocation. Slight over-length due to the extensive alias enumeration, but every sentence earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 4-parameter tool with no annotations and no output schema, the description covers purpose, behavior, and invocation aliases well. It could go further on return value shape (it mentions handles vs mutated targets) but doesn't explain output structure, though no output schema exists to compensate.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents all 4 parameters including the mode enum default and params container. The description adds little parameter-level detail beyond cross-referencing the alias list, which is baseline for full-coverage schemas.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb+resource ('Run a Cinema 4D modeling operation via c4d.utils.SendModelingCommand') and enumerates the exact operations (Current State to Object, Connect/Join, Split, etc.). This clearly distinguishes it from siblings like call_command or set_mesh.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It lists commands and their behavioral categories (geometry-producing vs in-place), which implicitly helps selection, but never states when to prefer this tool over alternatives like call_command or set_mesh. No explicit exclusions or alternatives are named.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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