version: "1.0.1" name: roblox-building description: "Use when building or editing geometry, maps, props, or generated assets with MCP or standalone Luau." when_to_use: "Also for fixing map gaps, z-fighting, scale, collisions or players escaping the map, placing store assets, and reviewing a map layout." last_reviewed: 2026-10-14 sources:

• original
• https://create.roblox.com/docs/en-us/projects/assets/privacy.md
• https://devforum.roblox.com/t/large-scale-roblox-terrain-the-ultimate-guide/405672
• https://devforum.roblox.com/t/a-complete-guide-to-editableimages/3858566
• https://create.roblox.com/docs/reference/engine/classes/EditableImage
• https://raw.githubusercontent.com/Roblox/creator-docs/main/content/en-us/studio/mcp.md
• https://create.roblox.com/docs/production/game-design/core-loops
• https://create.roblox.com/docs/production/game-design/onboarding
• https://create.roblox.com/docs/production/game-design/onboarding-techniques
• https://create.roblox.com/docs/projects/assets/toolbox
• https://create.roblox.com/docs/scripting/security/third-party-vulnerabilities
• https://create.roblox.com/docs/assistant/guide

Roblox Building

When to Load

Load for geometry, props, maps, and spatial onboarding via MCP or Luau.

Quick Reference

MCP Build Mode

1-2. Inspect Studio/Workspace/assets; name root, origin, dimensions, assets. 3-4. Build in phases with readback; verify tree, view, traversal.

Asset Choice

• Search project assets and Toolbox first; check type, creator, price, scripts, fit.
• Paid/cross-owner insertion: disclose creator, ID, price, rights first. Inspect scripts/dependencies; remove unneeded code. See roblox-security.
• MCP: generate_procedural_model, generate_mesh, generate_material.
• Check mesh bounds, collision, PBR, and quality levels.
• Use permitted images; wait for jobs to finish.
• EditableImage/EditableMesh: permission + memory limits.
• Native Parts/CSG when reuse/generation is unsuitable.
• Asset privacy: new accounts/groups create Images/Decals/Meshes Restricted — blank texture/invisible mesh usually means a missing grant, not corruption. Read the Output error; grant the experience in Creator Dashboard. See roblox-studio-mcp.

Player Scale

Player ~5 studs | Door 4w×7h | Ceiling 10-14 | Counter 3.5-4 | Seat 1.5 | Path 6+

Spatial Rules

• Name dimensions; offset sub-parts from anchor CFrames, never guessed world coordinates.
• Snap to 0.125/0.25/0.5 studs. Build complex CSG near origin, then PivotTo the destination.
• Set anchoring, collision, shadows, color, material explicitly.

Acceptance

Prop: named model, pivot, scale, bounds, materials, collision, anchoring, no loose parts, provenance. Map: root/origin, zones, landmarks, spawns/return paths, traversal, bounds excluding Baseplate/Terrain/SpawnLocation. Evidence: readback, view when supported, playtest results.

Anti-Patterns

Guessing coordinates | unanchored/duplicate parts | hardcoded world positions | silent CSG failure | oversized batches | claims without readback

Details: references/full.md (maps, validation, assets).