VoxelDraft – AI Voxel Modeling
https://voxeldraft.com/api/mcp ↗
Description
Create, edit, render, save, and export voxel models with interactive 3D previews.
What our measurements say
VoxelDraft – AI Voxel Modeling is a remote MCP server published at voxeldraft.com. It has been probed 8 times since 9/12/2026. It answered in 8 of them (100.0%), a near-uninterrupted record. Median response time is 218 ms, placing it among the faster endpoints. It offers a narrow, focused set of 8 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool names clearly indicate their primary function (e.g., 'create_voxel_model', 'edit_voxel_model').
- Some tools (e.g., 'render_voxel_model') provide useful constraints like coordinate ranges and format options.
Weaknesses
- Descriptions often omit critical use-case context (e.g., when to use 'inspect_voxel_model' vs. 'load_voxel_project').
- Parameter descriptions are incomplete (e.g., 'Coordinates ' and 'Colors are either #R' cut off mid-sentence).
- Error handling and rate-limiting constraints are inconsistently documented across tools.
create_voxel_model— Incomplete parameter description: 'Coordinates ' cuts off mid-sentence.edit_voxel_model— Incomplete parameter description: 'Colors are either #R' cuts off mid-sentence.save_voxel_model— No explicit error handling for invalid project IDs or OAuth scope checks.
Verdict
Event narrative
Sign up free to generateSchema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test failed · last run:
- Cold-start: cold 50ms → warm 42ms (penalty 8ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
create_voxel_modelCreate an editable VoxelDraft model from compact commands. Returns a short modelRef for later plugin calls and does not save to Cloud Projects. Use VoxelDraft's compact instruction stream instead of emitting one JSON object per voxel. Coordinates are integers 0..63. Colors are either #RRGGBB or a zero-based palette index. Commands: ["box",x1,y1,z1,x2,y2,z2,color,hollow?] ["ellipsoid",cx,cy,cz,rx,ry,rz,color,hollow?] ["cylinder","x"|"y"|"z",x,y,z,radius,height,color,hollow?] ["line",x1,y1,z1,x2,y2,z2,color] ["roof","x"|"z",x1,y1,z1,x2,y2,z2,color] (gable roof, axis is ridge direction) ["runs","x"|"y"|"z",color,[[x,y,z,length],...]] (preferred exact/freeform representation) ["points",color,[[x,y,z],...]] (sparse details only) ["erase",x1,y1,z1,x2,y2,z2] ["recolor",fromColor,toColor] ["copy",
namestringpalettearraycommandsarrayrequired
edit_voxel_modelEdit the temporary model identified by modelRef and return a new modelRef. This does not modify a saved cloud project. Use VoxelDraft's compact instruction stream instead of emitting one JSON object per voxel. Coordinates are integers 0..63. Colors are either #RRGGBB or a zero-based palette index. Commands: ["box",x1,y1,z1,x2,y2,z2,color,hollow?] ["ellipsoid",cx,cy,cz,rx,ry,rz,color,hollow?] ["cylinder","x"|"y"|"z",x,y,z,radius,height,color,hollow?] ["line",x1,y1,z1,x2,y2,z2,color] ["roof","x"|"z",x1,y1,z1,x2,y2,z2,color] (gable roof, axis is ridge direction) ["runs","x"|"y"|"z",color,[[x,y,z,length],...]] (preferred exact/freeform representation) ["points",color,[[x,y,z],...]] (sparse details only) ["erase",x1,y1,z1,x2,y2,z2] ["recolor",fromColor,toColor] ["copy",x1,y1,z1,x2,y2,z2,dx,dy,d
modelRefstringrequiredpalettearraycommandsarrayrequired
inspect_voxel_modelInspect a temporary VoxelDraft modelRef. Returns voxel count, command count, bounds, and colors.
modelRefstringrequired
render_voxel_modelPreview 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.
modelRefstringrequiredlanguagestringincludeImagebooleanviewstringimageSizeintegerbackgroundstring
export_voxel_modelCreate direct download URLs for OBJ+MTL or compact VoxelDraft JSON from a modelRef.
modelRefstringrequiredformatstring
save_voxel_modelSave the temporary model identified by modelRef to private VoxelDraft Cloud Projects. Requires project-write OAuth scope. Pass projectId to update an existing owned cloud project.
modelRefstringrequiredprojectIdstring
list_voxel_projectsList private VoxelDraft Cloud Projects. Requires project-read OAuth scope.
load_voxel_projectLoad one private Cloud Project and return a short modelRef for later plugin calls. Requires project-read OAuth scope.
projectIdstringrequiredlanguagestring
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Server build: 0.5.0 → 0.5.1
- Server build: 0.3.0 → 0.5.0
- Added to watch — era: Dual-era
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