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Set Mesh Selection

set_mesh_selection

Replace point, polygon, or edge selection on an editable mesh. Clears existing selection of that kind, then marks the specified indices as selected.

Instructions

Replace the point / polygon / edge BaseSelect on an editable mesh. Existing selection of the specified kind is cleared first. Pair with get_mesh using include:['selections'] to read the same channels back.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
kindYesWhich selection channel to replace.
handleYesEditable target (PointObject / PolygonObject).
indicesYesIndices to mark selected.

Schema Changelog

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

  1. Changed1 schema field 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"
+  }
+]
  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 discloses the key behavior: it replaces the selection and clears existing ones. It also notes the prerequisite of an editable mesh. Without annotations, this provides sufficient transparency, though it doesn't discuss edge cases like invalid indices.

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?

Two sentences, direct and to the point, with no redundant wording. Every sentence adds value: the action, the clearing behavior, and the pairing hint.

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?

It fully describes the operation, prerequisites, and how to read back the result. Given it's a set operation without an output schema, the description is complete for typical use cases.

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?

The schema covers all parameters with descriptions. The description adds context such as 'point/polygon/edge' matching the kind enum and clarifies the effect on existing selection. It also ties the handle to an editable mesh, enhancing the schema's basic definitions.

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 explicitly states the action (replace), the resource (point/polygon/edge BaseSelect on an editable mesh), and specifies the scope. It also mentions pairing with get_mesh, making the intent unambiguous.

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?

It clearly states that existing selection is cleared first, providing usage behavior. It also suggests pairing with get_mesh to read back, giving context. However, it doesn't explicitly mention when not to use it (e.g., for non-editable meshes or alternative tools).

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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