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Apply Xpresso Graph Description

apply_xpresso_graph

Build Xpresso graphs in Cinema 4D by creating nodes and wiring connections in a single call, with optional automatic Texpresso tag creation.

Instructions

Declarative builder for an Xpresso (classic GvNodeMaster) graph — mirror of apply_graph_description but for Xpresso rather than Maxon node materials. Creates nodes (CreateNode) and wires connections (GvPort.Connect) in one call. Accepts an operator_id as an int (e.g. c4d.ID_OPERATOR_CONST=1001150) or short alias ('object'|'const'|'result'|'math'|'range_mapper'|'condition'|'compare'|'memory'|'iterate'|'bool'|'freeze'|'formula'|'realtovect'|'vecttoreal'|'matrix2vect'|'vect2matrix'|'link'|'spy'|'python'). Optionally creates the Texpresso tag when given an object handle and create_tag_if_missing:true. Example: build a Object.Global Position -> Result graph in three calls (create Cube → apply_xpresso_graph → EventAdd).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nodesYesNode specs keyed by caller-chosen stable id (used in `connect`).
handleYesXpresso tag handle (Texpresso) or an object handle (pass create_tag_if_missing:true to auto-add a tag).
connectNoConnection list. `from` defaults to dir='out' and `to` defaults to dir='in'. Internally always calls outputPort.Connect(inputPort).
create_tag_if_missingNoWhen handle is an object and no Texpresso tag exists, create one. Default true.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed7 schema fields changedv0.5.1
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    • removedInput schema / properties / handle / allOf
      Removed value: -[
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-  }
-]
    • addedInput schema / properties / handle / anyOf
      Added value: +[
+  {
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+          "sculpt_brush"
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+    "required": [
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+  },
+  {
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+        "minimum": 0,
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+      "owner": {
+        "additionalProperties": {},
+        "description": "Handle of the shader's owner (material, object, tag, video_post, or shader).",
+        "properties": {
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+        },
+        "required": [
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+        "type": "object"
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+    "required": [
+      "kind",
+      "owner"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
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+        "type": "string"
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+      "kind": {
+        "const": "gv_node",
+        "type": "string"
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+      "name": {
+        "type": "string"
+      },
+      "tag": {
+        "properties": {
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+            "const": "tag",
+            "type": "string"
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+          "object": {
+            "type": "string"
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+          "object_path": {
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+    "required": [
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+    ],
+    "type": "object"
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+]
    • changedInput schema / properties / nodes / additionalProperties / properties / position / items
      Previous value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "number"
-  }
-]New value: +{
+  "type": "number"
+}
    • addedInput schema / properties / nodes / additionalProperties / properties / position / maxItems
      Added value: +2
    • addedInput schema / properties / nodes / additionalProperties / properties / position / minItems
      Added value: +2
    • changedInput schema / properties / nodes / additionalProperties / properties / references / additionalProperties / anyOf
      Previous value: -[
-  {
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-  },
-  {
-    "allOf": [
-      {
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-      }
-    ]
-  }
-]New value: +[
+  {
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+  {
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+            "type": "string"
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+        },
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+        "required": [
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+      },
+      {
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+            "const": "material",
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+          "name": {
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+        "required": [
+          "kind",
+          "name"
+        ],
+        "type": "object"
+      },
+      {
+        "properties": {
+          "kind": {
+            "const": "layer",
+            "type": "string"
+          },
+          "name": {
+            "type": "string"
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+        },
+        "required": [
+          "kind",
+          "name"
+        ],
+        "type": "object"
+      },
+      {
+        "properties": {
+          "kind": {
+            "const": "tag",
+            "type": "string"
+          },
+          "object": {
+            "type": "string"
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+        "type": "object"
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+      {
+        "properties": {
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+            "const": "video_post",
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+            "type": "string"
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+                "type": "integer"
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+          "plugin_type": {
+            "enum": [
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+              "material",
+              "shader",
+              "video_post",
+              "scene_loader",
+              "scene_saver",
+              "bitmap_loader",
+              "bitmap_saver",
+              "tool",
+              "preference",
+              "node",
+              "sculpt_brush"
+            ],
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+        },
+        "required": [
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+            "type": "integer"
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+            "type": "string"
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+          "name": {
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+          },
+          "owner": {
+            "additionalProperties": {},
+            "description": "Handle of the shader's owner (material, object, tag, video_post, or shader).",
+            "properties": {
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+        "required": [
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+      },
+      {
+        "properties": {
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+            "type": "string"
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+          "kind": {
+            "const": "gv_node",
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+          "name": {
+            "type": "string"
+          },
+          "tag": {
+            "properties": {
+              "kind": {
+                "const": "tag",
+                "type": "string"
+              },
+              "object": {
+                "type": "string"
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+              "object_path": {
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+                "minimum": -9007199254740991,
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+            "type": "object"
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+    ]
+  }
+]
  2. Changed1 schema field changedv0.4.3
    • changedInput schema / definitions / __schema0 / anyOf
      Previous value: -[
-  {
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-        "const": "video_post",
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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"
-  }
-]New value: +[
+  {
+    "properties": {
+      "kind": {
+        "const": "object",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      },
+      "path": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "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": {
+        "allOf": [
+          {
+            "$ref": "#/definitions/__schema0"
+          }
+        ]
+      }
+    },
+    "required": [
+      "kind",
+      "owner"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "id": {
+        "type": "string"
+      },
+      "kind": {
+        "const": "gv_node",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      },
+      "tag": {
+        "allOf": [
+          {
+            "$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

A4.3/5.0
Behavior4/5

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 the underlying operations (CreateNode, GvPort.Connect) and the side-effect that it can create the Texpresso tag when create_tag_if_missing:true. It does not cover atomicity, failure behavior, or permissions, which leaves a gap for an unannotated mutating tool.

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 purpose and the sibling differentiation, then the key parameter semantics and example. The alias enumeration is long but earns its place given the schema's vagueness there.

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 complex nested-schema, 4-parameter mutating tool with no output schema and no annotations, the description covers purpose, alternatives, the operator_id format, tag creation, and a usage example. It stops short of return-value/error semantics, but nothing essential for correct invocation is missing.

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

Parameters4/5

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

Schema coverage is 100%, so baseline is 3, but the description adds real value by enumerating the operator_id aliases ('object'|'const'|'result'|...) that the schema only references abstractly as 'short alias'. That mapping is not derivable from the schema alone.

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?

States a specific verb and resource ('Declarative builder for an Xpresso ... graph') and explicitly distinguishes itself from the sibling apply_graph_description ('mirror of apply_graph_description but for Xpresso rather than Maxon node materials'). An agent can route between the two without opening either schema.

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

Usage Guidelines4/5

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

Names the alternative (apply_graph_description) and the condition that selects this one (Xpresso vs Maxon node materials), and provides a concrete workflow example (Cube -> apply_xpresso_graph -> EventAdd). No explicit when-not or error/prerequisite guidance, so not a 5.

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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