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mcp-cinema4d

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Get Parameter Values

get_params
Read-only

Retrieve parameter values from Cinema 4D objects, tags, materials, and other entities by specifying their IDs or DescID paths.

Instructions

Read parameter values on a C4D entity by id or DescID path. Each id may be: an int (top-level), a list [a, b, …] (chained DescID; dtypes inferred from the description), or contain 'x'/'y'/'z' for vector sub-components (e.g. [903, 'x'] = position.x). For explicit dtypes use [[id, 'real|long|bool|vector'], …]. Returns {values: [{path, value}]} in request order. Discover ids via describe.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idsYesList of parameter paths to read.
handleYesC4D entity handle. Shapes: {kind:"object",name?|path?}, {kind:"render_data",name}, {kind:"take",name}, {kind:"material",name}, {kind:"layer",name}, {kind:"tag",object?|object_path?,type_id?,tag_name?}, {kind:"video_post",render_data,type_id}, {kind:"shader",owner:<handle>,index}, {kind:"gv_node",tag:<tag handle>,id?|name?} (Xpresso GvNode; use list_xpresso_nodes to discover stable path ids — GvNode inherits BaseList2D so set_params/get_params/describe work on it), {kind:"plugin_options",plugin_id,plugin_type?} (plugin_id accepts an int or a format alias like "abc"/"fbx"/"obj"/"usd"/"gltf"; plugin_type defaults to "scene_saver"; resolves to the plugin's settings BaseList2D — describe+set_params it to configure exporter options before save_document). Prefer `path` over `name` when names are not unique.

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. Changed2 schema fields changedv0.4.3
    • changedInput schema / definitions / __schema0 / anyOf
      Previous 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": "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"
-  }
-]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"
+  }
+]
    • changedInput schema / properties / handle / description
      Previous value: -"C4D entity handle. Shapes: {kind:\"object\",name?|path?}, {kind:\"render_data\",name}, {kind:\"take\",name}, {kind:\"material\",name}, {kind:\"tag\",object?|object_path?,type_id?,tag_name?}, {kind:\"video_post\",render_data,type_id}, {kind:\"shader\",owner:<handle>,index}, {kind:\"gv_node\",tag:<tag handle>,id?|name?} (Xpresso GvNode; use list_xpresso_nodes to discover stable path ids — GvNode inherits BaseList2D so set_params/get_params/describe work on it), {kind:\"plugin_options\",plugin_id,plugin_type?} (plugin_id accepts an int or a format alias like \"abc\"/\"fbx\"/\"obj\"/\"usd\"/\"gltf\"; plugin_type defaults to \"scene_saver\"; resolves to the plugin's settings BaseList2D — describe+set_params it to configure exporter options before save_document). Prefer `path` over `name` when names are not unique."New value: +"C4D entity handle. Shapes: {kind:\"object\",name?|path?}, {kind:\"render_data\",name}, {kind:\"take\",name}, {kind:\"material\",name}, {kind:\"layer\",name}, {kind:\"tag\",object?|object_path?,type_id?,tag_name?}, {kind:\"video_post\",render_data,type_id}, {kind:\"shader\",owner:<handle>,index}, {kind:\"gv_node\",tag:<tag handle>,id?|name?} (Xpresso GvNode; use list_xpresso_nodes to discover stable path ids — GvNode inherits BaseList2D so set_params/get_params/describe work on it), {kind:\"plugin_options\",plugin_id,plugin_type?} (plugin_id accepts an int or a format alias like \"abc\"/\"fbx\"/\"obj\"/\"usd\"/\"gltf\"; plugin_type defaults to \"scene_saver\"; resolves to the plugin's settings BaseList2D — describe+set_params it to configure exporter options before save_document). Prefer `path` over `name` when names are not unique."
  2. First observedv0.3.1

TDQS

A4.5/5.0
Behavior4/5

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

The description adds meaningful behavior beyond the readOnlyHint annotation by disclosing the return envelope `{values: [{path, value}]}`, preservation of request order, dtype inference rules, and the explicit dtype override syntax. It does not address invalid-id or missing-parameter behavior, which is a minor transparency gap. No contradiction with the readOnlyHint annotation.

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

Conciseness5/5

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

The description is compact and well-structured: one opening purpose sentence, two sentences for id forms, one for return shape, and one for discovery workflow. Every sentence earns its place and nothing is redundant.

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?

Combined with the schema's detailed handle shapes, the description gives an agent enough to call the tool correctly: id syntax, return format, ordering, and the path for discovering ids. The only missing context is edge-case behavior such as unknown ids or missing values, which prevents a perfect score.

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

Parameters5/5

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

Although the schema covers both parameters, it only provides a raw union type and a terse description. The tool description supplies the operational meaning: ints are top-level, lists are chained DescIDs, 'x'/'y'/'z' denote vector sub-components, and explicit dtypes use the nested form. The concrete example `[903, 'x'] = position.x` makes the semantics actionable.

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 clear read operation: 'Read parameter values on a C4D entity by id or DescID path.' This specific verb and resource distinguish it from siblings like set_params and describe without requiring schema inspection. The purpose is unambiguous and action-oriented.

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?

The description gives clear usage context, especially the discovery workflow: 'Discover ids via describe.' The read-only framing also implicitly distinguishes it from set_params. However, it does not explicitly name alternatives or state when not to use this tool, so it falls just short of complete usage guidance.

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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