list_user_dataEnumerate user data slots on a Cinema 4D object. Returns each slot's ID, name, data type, and value for inspection or parameter operations.
Enumerate the User Data slots on a target. Each entry carries {desc_id, name, dtype, value}. Feed desc_id back into remove_user_data / get_params / set_params as a DescID path.
| Name | Required | Description | Default |
|---|---|---|---|
| handle | Yes | Target to inspect. |
Changes observed during successful MCP inspections. Dates show when Glama detected each change.
v0.4.3Input schema / definitions / __schema0 / anyOfPrevious 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"
+ }
+]v0.3.1Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations only mark readOnlyHint=true, so the description carries the burden of behavioral disclosure. It adds the return shape (desc_id, name, dtype, value) and the pattern for reusing desc_id, which goes beyond what annotations state. No contradiction with read-only semantics; if anything, the read-only hint is reinforced by the non-mutating language.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences, front-loaded with the core action, followed by output shape and integration hint. Every word earns its place.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple read-only listing tool with a single parameter and no output schema, the description adequately covers purpose, output, and follow-up usage. While it doesn't discuss edge cases (e.g., empty results, performance, or supported target kinds), the complex handle union is fully documented in the schema, so nothing critical is missing.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% with the handle property described as 'Target to inspect.' The description's phrase 'on a target' adds no new information about the parameter beyond what the schema provides. The description focuses on the output rather than elaborating on the input, so it does not enhance parameter understanding beyond baseline.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a clear verb ('Enumerate') and resource ('User Data slots on a target'), immediately distinguishing it from siblings like add_user_data and remove_user_data. The output format is also specified, leaving no ambiguity about what the tool does.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
It directs the agent to feed desc_id into related tools (remove_user_data / get_params / set_params), which is a clear usage pointer. However, it does not indicate when to prefer this tool over other listing tools (e.g., list_entities, list_layers) or mention any exclusions.
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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