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VoxelDraft – AI Voxel Modeling

by io.github.huruki-geo
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Render voxel model

render_voxel_model

Preview a VoxelDraft modelRef. ChatGPT can render an interactive Three.js/WebGL widget; everyone also receives an interactive WebGL URL. Signed-in VoxelDraft Plus users may additionally receive a cached PNG when includeImage is true.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
viewNoiso
languageNoen
modelRefYesShort temporary VoxelDraft model reference returned by model tools
imageSizeNo
backgroundNosolid
includeImageNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
viewYes
imageNo
modelYes
quotaNo
statsYes
reasonNo
editUrlYes
modelRefYesShort temporary VoxelDraft model reference returned by model tools
rendererYes
imageSizeYes
renderUrlYes
backgroundYes
imageErrorNo
downloadUrlNo
imageAvailableNo
rendererVersionYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "additionalProperties": false,
+  "properties": {
+    "background": {
+      "enum": [
+        "solid",
+        "transparent"
+      ],
+      "type": "string"
+    },
+    "downloadUrl": {
+      "type": "string"
+    },
+    "editUrl": {
+      "type": "string"
+    },
+    "image": {
+      "type": "object"
+    },
+    "imageAvailable": {
+      "type": "boolean"
+    },
+    "imageError": {
+      "type": "string"
+    },
+    "imageSize": {
+      "enum": [
+        256,
+        512,
+        1024
+      ],
+      "type": "integer"
+    },
+    "model": {
+      "type": "string"
+    },
+    "modelRef": {
+      "description": "Short temporary VoxelDraft model reference returned by model tools",
+      "maxLength": 64,
+      "type": "string"
+    },
+    "name": {
+      "type": "string"
+    },
+    "quota": {
+      "type": "object"
+    },
+    "reason": {
+      "type": "string"
+    },
+    "renderUrl": {
+      "type": "string"
+    },
+    "renderer": {
+      "type": "string"
+    },
+    "rendererVersion": {
+      "type": "string"
+    },
+    "stats": {
+      "additionalProperties": false,
+      "properties": {
+        "bounds": {
+          "anyOf": [
+            {
+              "additionalProperties": false,
+              "properties": {
+                "max": {
+                  "items": {
+                    "type": "integer"
+                  },
+                  "maxItems": 3,
+                  "minItems": 3,
+                  "type": "array"
+                },
+                "min": {
+                  "items": {
+                    "type": "integer"
+                  },
+                  "maxItems": 3,
+                  "minItems": 3,
+                  "type": "array"
+                },
+                "size": {
+                  "items": {
+                    "type": "integer"
+                  },
+                  "maxItems": 3,
+                  "minItems": 3,
+                  "type": "array"
+                }
+              },
+              "required": [
+                "min",
+                "max",
+                "size"
+              ],
+              "type": "object"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "colors": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "commandCount": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "voxelCount": {
+          "minimum": 0,
+          "type": "integer"
+        }
+      },
+      "required": [
+        "voxelCount",
+        "commandCount",
+        "colors",
+        "bounds"
+      ],
+      "type": "object"
+    },
+    "view": {
+      "enum": [
+        "iso",
+        "front",
+        "back",
+        "left",
+        "right",
+        "top",
+        "bottom"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "model",
+    "modelRef",
+    "name",
+    "stats",
+    "renderer",
+    "rendererVersion",
+    "view",
+    "imageSize",
+    "background",
+    "editUrl",
+    "renderUrl"
+  ],
+  "type": "object"
+}
  2. Changed2 schema fields changed
    • changedInput schema / properties / modelRef / description
      Previous value: -"Short temporary VoxelDraft model reference that expires after 7 days of inactivity"New value: +"Short temporary VoxelDraft model reference returned by model tools"
    • changedOutput schema / (root)
      Previous value: -{
-  "additionalProperties": false,
-  "properties": {
-    "background": {
-      "enum": [
-        "solid",
-        "transparent"
-      ],
-      "type": "string"
-    },
-    "editUrl": {
-      "format": "uri",
-      "type": "string"
-    },
-    "image": {
-      "additionalProperties": false,
-      "properties": {
-        "background": {
-          "enum": [
-            "solid",
-            "transparent"
-          ],
-          "type": "string"
-        },
-        "browserMsUsed": {
-          "minimum": 0,
-          "type": "number"
-        },
-        "cached": {
-          "type": "boolean"
-        },
-        "height": {
-          "enum": [
-            256,
-            512,
-            1024
-          ],
-          "type": "integer"
-        },
-        "mimeType": {
-          "const": "image/png",
-          "type": "string"
-        },
-        "view": {
-          "enum": [
-            "iso",
-            "front",
-            "back",
-            "left",
-            "right",
-            "top",
-            "bottom"
-          ],
-          "type": "string"
-        },
-        "width": {
-          "enum": [
-            256,
-            512,
-            1024
-          ],
-          "type": "integer"
-        }
-      },
-      "required": [
-        "mimeType",
-        "width",
-        "height",
-        "cached",
-        "view",
-        "background"
-      ],
-      "type": "object"
-    },
-    "imageAvailable": {
-      "type": "boolean"
-    },
-    "imageError": {
-      "type": "string"
-    },
-    "imageSize": {
-      "enum": [
-        256,
-        512,
-        1024
-      ],
-      "type": "integer"
-    },
-    "model": {
-      "type": "string"
-    },
-    "modelRef": {
-      "description": "Short temporary VoxelDraft model reference that expires after 7 days of inactivity",
-      "maxLength": 64,
-      "type": "string"
-    },
-    "name": {
-      "type": "string"
-    },
-    "quota": {
-      "oneOf": [
-        {
-          "additionalProperties": false,
-          "properties": {
-            "plan": {
-              "const": "free",
-              "type": "string"
-            }
-          },
-          "required": [
-            "plan"
-          ],
-          "type": "object"
-        },
-        {
-          "additionalProperties": false,
-          "properties": {
-            "cached": {
-              "type": "boolean"
-            },
-            "creditsUsed": {
-              "minimum": 0,
-              "type": "integer"
-            },
-            "dailyRemaining": {
-              "minimum": 0,
-              "type": "integer"
-            },
-            "monthlyRemaining": {
-              "minimum": 0,
-              "type": "integer"
-            },
-            "plan": {
-              "const": "plus",
-              "type": "string"
-            }
-          },
-          "required": [
-            "plan",
-            "creditsUsed",
-            "dailyRemaining",
-            "monthlyRemaining",
-            "cached"
-          ],
-          "type": "object"
-        }
-      ]
-    },
-    "reason": {
-      "type": "string"
-    },
-    "renderUrl": {
-      "format": "uri",
-      "type": "string"
-    },
-    "renderer": {
-      "type": "string"
-    },
-    "rendererVersion": {
-      "type": "string"
-    },
-    "stats": {
-      "additionalProperties": false,
-      "properties": {
-        "bounds": {
-          "anyOf": [
-            {
-              "type": "null"
-            },
-            {
-              "additionalProperties": false,
-              "properties": {
-                "max": {
-                  "items": {
-                    "maximum": 63,
-                    "minimum": 0,
-                    "type": "integer"
-                  },
-                  "maxItems": 3,
-                  "minItems": 3,
-                  "type": "array"
-                },
-                "min": {
-                  "items": {
-                    "maximum": 63,
-                    "minimum": 0,
-                    "type": "integer"
-                  },
-                  "maxItems": 3,
-                  "minItems": 3,
-                  "type": "array"
-                },
-                "size": {
-                  "items": {
-                    "maximum": 64,
-                    "minimum": 1,
-                    "type": "integer"
-                  },
-                  "maxItems": 3,
-                  "minItems": 3,
-                  "type": "array"
-                }
-              },
-              "required": [
-                "min",
-                "max",
-                "size"
-              ],
-              "type": "object"
-            }
-          ]
-        },
-        "colors": {
-          "items": {
-            "pattern": "^#[0-9a-fA-F]{6}$",
-            "type": "string"
-          },
-          "maxItems": 512,
-          "type": "array"
-        },
-        "commandCount": {
-          "maximum": 512,
-          "minimum": 0,
-          "type": "integer"
-        },
-        "voxelCount": {
-          "maximum": 100000,
-          "minimum": 0,
-          "type": "integer"
-        }
-      },
-      "required": [
-        "voxelCount",
-        "commandCount",
-        "colors",
-        "bounds"
-      ],
-      "type": "object"
-    },
-    "view": {
-      "enum": [
-        "iso",
-        "front",
-        "back",
-        "left",
-        "right",
-        "top",
-        "bottom"
-      ],
-      "type": "string"
-    }
-  },
-  "required": [
-    "model",
-    "name",
-    "stats",
-    "renderer",
-    "rendererVersion",
-    "view",
-    "imageSize",
-    "background",
-    "editUrl",
-    "renderUrl"
-  ],
-  "type": "object"
-}New value: +null
  3. Changed4 schema fields changed
    • removedInput schema / properties / model
      Removed value: -{
-  "type": "string"
-}
    • addedInput schema / properties / modelRef
      Added value: +{
+  "description": "Short temporary VoxelDraft model reference that expires after 7 days of inactivity",
+  "maxLength": 64,
+  "type": "string"
+}
    • changedInput schema / required
      Previous value: -[
-  "model"
-]New value: +[
+  "modelRef"
+]
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "additionalProperties": false,
+  "properties": {
+    "background": {
+      "enum": [
+        "solid",
+        "transparent"
+      ],
+      "type": "string"
+    },
+    "editUrl": {
+      "format": "uri",
+      "type": "string"
+    },
+    "image": {
+      "additionalProperties": false,
+      "properties": {
+        "background": {
+          "enum": [
+            "solid",
+            "transparent"
+          ],
+          "type": "string"
+        },
+        "browserMsUsed": {
+          "minimum": 0,
+          "type": "number"
+        },
+        "cached": {
+          "type": "boolean"
+        },
+        "height": {
+          "enum": [
+            256,
+            512,
+            1024
+          ],
+          "type": "integer"
+        },
+        "mimeType": {
+          "const": "image/png",
+          "type": "string"
+        },
+        "view": {
+          "enum": [
+            "iso",
+            "front",
+            "back",
+            "left",
+            "right",
+            "top",
+            "bottom"
+          ],
+          "type": "string"
+        },
+        "width": {
+          "enum": [
+            256,
+            512,
+            1024
+          ],
+          "type": "integer"
+        }
+      },
+      "required": [
+        "mimeType",
+        "width",
+        "height",
+        "cached",
+        "view",
+        "background"
+      ],
+      "type": "object"
+    },
+    "imageAvailable": {
+      "type": "boolean"
+    },
+    "imageError": {
+      "type": "string"
+    },
+    "imageSize": {
+      "enum": [
+        256,
+        512,
+        1024
+      ],
+      "type": "integer"
+    },
+    "model": {
+      "type": "string"
+    },
+    "modelRef": {
+      "description": "Short temporary VoxelDraft model reference that expires after 7 days of inactivity",
+      "maxLength": 64,
+      "type": "string"
+    },
+    "name": {
+      "type": "string"
+    },
+    "quota": {
+      "oneOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "plan": {
+              "const": "free",
+              "type": "string"
+            }
+          },
+          "required": [
+            "plan"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "cached": {
+              "type": "boolean"
+            },
+            "creditsUsed": {
+              "minimum": 0,
+              "type": "integer"
+            },
+            "dailyRemaining": {
+              "minimum": 0,
+              "type": "integer"
+            },
+            "monthlyRemaining": {
+              "minimum": 0,
+              "type": "integer"
+            },
+            "plan": {
+              "const": "plus",
+              "type": "string"
+            }
+          },
+          "required": [
+            "plan",
+            "creditsUsed",
+            "dailyRemaining",
+            "monthlyRemaining",
+            "cached"
+          ],
+          "type": "object"
+        }
+      ]
+    },
+    "reason": {
+      "type": "string"
+    },
+    "renderUrl": {
+      "format": "uri",
+      "type": "string"
+    },
+    "renderer": {
+      "type": "string"
+    },
+    "rendererVersion": {
+      "type": "string"
+    },
+    "stats": {
+      "additionalProperties": false,
+      "properties": {
+        "bounds": {
+          "anyOf": [
+            {
+              "type": "null"
+            },
+            {
+              "additionalProperties": false,
+              "properties": {
+                "max": {
+                  "items": {
+                    "maximum": 63,
+                    "minimum": 0,
+                    "type": "integer"
+                  },
+                  "maxItems": 3,
+                  "minItems": 3,
+                  "type": "array"
+                },
+                "min": {
+                  "items": {
+                    "maximum": 63,
+                    "minimum": 0,
+                    "type": "integer"
+                  },
+                  "maxItems": 3,
+                  "minItems": 3,
+                  "type": "array"
+                },
+                "size": {
+                  "items": {
+                    "maximum": 64,
+                    "minimum": 1,
+                    "type": "integer"
+                  },
+                  "maxItems": 3,
+                  "minItems": 3,
+                  "type": "array"
+                }
+              },
+              "required": [
+                "min",
+                "max",
+                "size"
+              ],
+              "type": "object"
+            }
+          ]
+        },
+        "colors": {
+          "items": {
+            "pattern": "^#[0-9a-fA-F]{6}$",
+            "type": "string"
+          },
+          "maxItems": 512,
+          "type": "array"
+        },
+        "commandCount": {
+          "maximum": 512,
+          "minimum": 0,
+          "type": "integer"
+        },
+        "voxelCount": {
+          "maximum": 100000,
+          "minimum": 0,
+          "type": "integer"
+        }
+      },
+      "required": [
+        "voxelCount",
+        "commandCount",
+        "colors",
+        "bounds"
+      ],
+      "type": "object"
+    },
+    "view": {
+      "enum": [
+        "iso",
+        "front",
+        "back",
+        "left",
+        "right",
+        "top",
+        "bottom"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "model",
+    "name",
+    "stats",
+    "renderer",
+    "rendererVersion",
+    "view",
+    "imageSize",
+    "background",
+    "editUrl",
+    "renderUrl"
+  ],
+  "type": "object"
+}
  4. Changed3 schema fields changed
    • addedInput schema / properties / background
      Added value: +{
+  "default": "solid",
+  "enum": [
+    "solid",
+    "transparent"
+  ],
+  "type": "string"
+}
    • changedInput schema / properties / imageSize / enum
      Previous value: -[
-  256,
-  512
-]New value: +[
+  256,
+  512,
+  1024
+]
    • addedInput schema / properties / view
      Added value: +{
+  "default": "iso",
+  "enum": [
+    "iso",
+    "front",
+    "back",
+    "left",
+    "right",
+    "top",
+    "bottom"
+  ],
+  "type": "string"
+}
  5. First observed

TDQS

A3.7/5.0
Behavior4/5

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

Annotations only supply the generic readOnly/openWorld/destructive flags; the description adds real context: rendering happens inside ChatGPT, everyone gets a WebGL URL, and only signed-in Plus users get a cached PNG when includeImage is true. This explains the tiered/cost-dependent behavior that justifies readOnlyHint=false.

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?

Two front-loaded sentences that cover output forms and the includeImage condition with little waste. No padding or restatement of the title.

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?

An output schema exists, so return values need not be detailed, and the description still summarizes what the caller receives. Combined with the tier behavior noted, an agent has enough to call it correctly, though parameter-level gaps remain for view/language/imageSize/background.

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 17%, so the description should compensate, and it only clarifies includeImage's conditional effect and modelRef's role. The other four parameters (view, language, imageSize, background) are undocumented beyond their enum values.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

Specific verb (Preview) plus resource (modelRef), and it explains the deliverable (interactive Three.js/WebGL widget, WebGL URL, optional PNG). It does not differentiate itself from siblings like inspect_voxel_model or export_voxel_model, which an agent must infer.

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

Usage Guidelines3/5

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

The word 'Preview' implies visual rendering as opposed to inspecting or exporting, but there is no explicit when-to-use guidance and no sibling is named as an alternative. Usage is only implied by the tool's name and output description.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

All VoxelDraft – AI Voxel Modeling toolsInspect
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