Unity Terrain Skills

Guardrails

Operating Mode (v1.9 three-tier):

• Approval (default): query skills (terrain_get_info, terrain_get_height) run directly. Create/modify skills (terrain_create, terrain_set_height, terrain_set_heights_batch, terrain_add_hill, terrain_generate_perlin, terrain_smooth, terrain_flatten, terrain_paint_texture) are FullAuto — on MODE_RESTRICTED, run the grant protocol; /permission/grant executes the skill server-side and returns the result.
• Auto / Bypass: SemiAuto and FullAuto run directly.
• This module contains no Delete / PlayMode / Reload / RiskLevel="high" skills — nothing auto-classifies as forbidden. To remove a terrain delete the asset via asset_delete (subject to its own forbidden rules).

Note: All sculpt/paint operations require an existing Terrain in the scene, or use terrain_create to generate one.

DO NOT (common hallucinations):

• terrain_set_texture does not exist → use terrain_paint_texture with layer index and brush parameters
• terrain_add_tree / terrain_add_grass do not exist → these require Unity Terrain tools or custom scripts
• terrain_set_size does not exist → terrain dimensions are set at creation via terrain_create
• terrain_import_heightmap / terrain_set_heights do not exist → use terrain_set_heights_batch with a 2D heights array ([z][x] values 0-1)