Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/besty0728/unity-skills/probuildernpx skills add Besty0728/Unity-Skills --skill probuildergit clone --depth 1 https://github.com/Besty0728/Unity-SkillsWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00013 | $0.01816 |
| Opus 5 | $0.00006 | $0.00908 |
| Sonnet 5 | $0.00003 | $0.00363 |
| Haiku 4.5 | $0.00001 | $0.00182 |
Grade A, and why
unity-probuilder scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Before calling any skill in this module: if you are about to call a skill with parameters guessed from its name or description, STOP — read this file (or fetch its schema via
GET /skills/recommend?includeSchema=true) first. If you already have the parameter definitions from recommend/schema, you may proceed straight to dryRun.
Triggers
- Blocking out levels
- Building or editing ProBuilder geometry
- Prototyping shapes in-editor
- 搭建关卡灰盒、创建或编辑 ProBuilder 几何体、在编辑器内快速搭形
Unity ProBuilder Skills
Use this module for editable ProBuilder meshes, not regular primitive GameObjects. It is best for blockout, level geometry, and procedural mesh refinement.
Requires:
com.unity.probuilderpackage. Batch-first: For scene blockout or level generation, preferprobuilder_create_batchwhen creating2+shapes.
Guardrails
Operating Mode (v1.9 three-tier):
- Approval (default): query skills (e.g.
probuilder_get_info,probuilder_get_vertices) run directly. Create/modify skills are FullAuto — call once, getMODE_RESTRICTED, run the grant protocol; a successful/permission/grantexecutes the skill server-side and returns the result in the same response. - Auto / Bypass: SemiAuto and FullAuto run directly.
- Auto-forbidden in this module:
probuilder_combine_meshes(SkillOperation.Modify | Delete, theDeletebit triggers NeverInSemi). It is callable only under Bypass mode or after the user adds it to the Allowlist; the grant flow returnsMODE_FORBIDDEN. Noteprobuilder_delete_facesisOperation = SkillOperation.Modifyonly and remains grantable under Approval/Auto. - When
com.unity.probuilderis missing, every skill returns a package-missing diagnostic instead of executing.
DO NOT (common hallucinations):
probuilder_create_meshdoes not exist -> useprobuilder_create_shapeprobuilder_edit_facedoes not exist -> use the specific face skills such asprobuilder_extrude_faces,probuilder_delete_faces,probuilder_merge_facesprobuilder_set_materialandprobuilder_set_face_materialare different -> whole object vs selected faces- Regular meshes do not become ProBuilder meshes automatically
- Mesh rebuild calls (
ToMesh()+Refresh()) are already handled by the skills. Do not invent a manual rebuild step
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 139 lines · 13 tokens per session scan A 2e738d3a5634
unity-probuilder is a skill published in the GitHub repository Besty0728/Unity-Skills (1,695 stars, last pushed yesterday), licensed MIT. It adds 13 tokens to every session and 1,816 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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