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Get Keyframes

get_keyframes
Read-only

Read keyframes from a Cinema 4D animation track using param ID and optional component, returning frame, value, and interpolation for a start/end frame range.

Instructions

Read the keys on a specific animation track. Combine with list_tracks to discover which (param_id, component) pairs are animated. Returns [{frame, value, interp}]. Optional start_frame / end_frame clip the range inclusively.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
fpsNoOverride for BaseTime → frame conversion.
handleYesAnimated entity.
param_idYesTop-level description id of the parameter.
componentNoSub-component for vector parameters. Omit / null for scalar tracks.
end_frameNoInclusive upper frame bound.
start_frameNoInclusive lower frame bound.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed3 schema fields changedv0.5.1
    • removedInput schema / definitions
      Removed value: -{
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-            "type": "integer"
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-        "required": [
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-        "type": "object"
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-          "kind": {
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-          "kind": {
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-          "tag": {
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-        "required": [
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-                "type": "integer"
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-              {
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-            ]
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-          "plugin_type": {
-            "enum": [
-              "command",
-              "object",
-              "tag",
-              "material",
-              "shader",
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-              "scene_loader",
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-              "sculpt_brush"
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-            "type": "string"
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-        "required": [
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-          "plugin_id"
-        ],
-        "type": "object"
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-    ]
-  }
-}
    • removedInput schema / properties / handle / allOf
      Removed value: -[
-  {
-    "$ref": "#/definitions/__schema0"
-  }
-]
    • addedInput schema / properties / handle / anyOf
      Added value: +[
+  {
+    "properties": {
+      "kind": {
+        "const": "object",
+        "type": "string"
+      },
+      "name": {
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+      }
+    },
+    "required": [
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+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
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+    },
+    "required": [
+      "kind",
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+    },
+    "required": [
+      "kind",
+      "name"
+    ],
+    "type": "object"
+  },
+  {
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+        "type": "string"
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+    "required": [
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+    ],
+    "type": "object"
+  },
+  {
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+        "type": "string"
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+      "object": {
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+      "object_path": {
+        "type": "string"
+      },
+      "tag_name": {
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+      },
+      "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": {
+      "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"
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-    "required": [
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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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-      "render_data",
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-    ],
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-  },
-  {
-    "properties": {
-      "index": {
-        "maximum": 9007199254740991,
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-        "type": "integer"
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-      "kind": {
-        "const": "shader",
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-      "owner": {
-        "allOf": [
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-  {
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-      "name": {
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-    "required": [
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-        "type": "string"
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-          "video_post",
-          "scene_loader",
-          "scene_saver",
-          "bitmap_loader",
-          "bitmap_saver",
-          "tool",
-          "preference",
-          "node",
-          "sculpt_brush"
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-]New value: +[
+  {
+    "properties": {
+      "kind": {
+        "const": "object",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
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+      "path": {
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+    },
+    "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"
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+      "name": {
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+    "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"
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+      "tag_name": {
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+      "type_id": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
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+    },
+    "required": [
+      "kind"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "kind": {
+        "const": "video_post",
+        "type": "string"
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+      "render_data": {
+        "type": "string"
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+      "type_id": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
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+    "required": [
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+    "required": [
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+    "type": "object"
+  },
+  {
+    "properties": {
+      "id": {
+        "type": "string"
+      },
+      "kind": {
+        "const": "gv_node",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      },
+      "tag": {
+        "allOf": [
+          {
+            "$ref": "#/definitions/__schema0"
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+        ]
+      }
+    },
+    "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?

Annotations only declare readOnlyHint=true. The description adds real behavioral value by disclosing the return shape `[{frame, value, interp}]` (no output schema exists) and the inclusive range-clipping semantics of start_frame/end_frame. It doesn't cover error/auth behavior, but most of the burden is met.

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?

Three compact sentences, front-loaded with the core action before the workflow hint and return shape. No filler or repetition of the title.

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

Completeness5/5

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

For a read-only tool with full schema coverage and no output schema, the description supplies the missing return-format and range semantics. An agent has everything it needs to call this correctly.

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 baseline is 3. The description reinforces the param_id/component pairing concept and the inclusive clip behavior, but the schema already documents fps, component, start_frame, and end_frame in equal or greater detail, so marginal added value is limited.

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 ('Read the keys on a specific animation track'), which cleanly distinguishes it from siblings like set_keyframe, delete_keyframe, and get_params. An agent can identify its role without opening the 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?

Gives a clear usage path: 'Combine with list_tracks to discover which (param_id, component) pairs are animated,' which tells the agent when this tool is needed. It stops short of explicit when-not-to-use or naming alternatives to get_keyframes itself.

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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