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 skills add kevinpbuckley/VibeUE --skill fabgit clone --depth 1 https://github.com/kevinpbuckley/VibeUEWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/kevinpbuckley/vibeue/fab)<a href="https://agentmods.dev/skills/kevinpbuckley/vibeue/fab"><img src="https://agentmods.dev/badge/skills/kevinpbuckley/vibeue/fab/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/kevinpbuckley/vibeue/fab"><img src="https://agentmods.dev/badge/skills/kevinpbuckley/vibeue/fab.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What 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 5.1 | $0.00068 | $0.00997 |
| Opus 5 | $0.00034 | $0.00498 |
| Sonnet 5 | $0.00014 | $0.00199 |
| Haiku 4.5 | $0.00007 | $0.00100 |
Grade A, and why
fab 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 10d 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 — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Fab asset import
FabService supports two deliberately separate paths:
- Public free catalog: search exact zero-price listings and directly import eligible glTF/GLB downloads. This does not sign in, purchase, claim an entitlement, or add the listing to My Library.
- Owned library: use the editor/launcher Epic session to list and import assets already owned by the account, including migrated Unreal Marketplace items.
Public free flow (Quixel/Megascans and other sellers)
- Call
search_free_catalog(query="", seller_filter="Quixel Megascans", format_filter="gltf"). Results are compact and includeid,title,seller,price, formats, thumbnail, and an opaquenext_cursor. Results require an exact-zero Personal tier; UEFN-reference-only offers are excluded. No authentication is required. - Show the chosen result and the Fab EULA to the user. Never set
accept_eula=trueon the user's behalf. It must represent their explicit acceptance. - Call
import_free_asset(listing_id, quality="High", format="gltf", license_slug="personal", accept_eula=true). The service re-fetches the listing and requires the selected license price to still be exactly zero before it requests a signed download. - Poll
import_status(listing_id)untilimportedorfailed, then verify a returned asset path withunreal.EditorAssetLibrary.does_asset_exist(path).
Direct free imports land under /Game/Fab/Free/<Title>. The original archive is cached under the
project's Saved/Fab/Free directory; no raw-file export API is exposed. ZIP paths are validated before
extraction. The first version supports Fab glTF/GLB ZIPs through automated Unreal Interchange import.
That is suitable for Quixel 3D assets, but it does not reproduce every private Megascans material setup
or support every Fab product format yet.
Owned-library flow
- Call
auth_status()first. If it is not authenticated, tell the user to open the Fab window or launch the editor from the Epic Games Launcher. - Call
list_library(...); userefresh=trueonly when the account library may have changed. - Call
get_asset(asset_id)to inspect versions and compatibility. - Call
import_asset(asset_id, ...), then pollimport_status(asset_id). - Verify the returned
/Game/...paths before reporting success.
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.
- 10d ago First seen · 81 lines · 68 tokens per session scan A 601243fc35e2
fab is a skill published in the GitHub repository kevinpbuckley/VibeUE (662 stars, last pushed 6d ago), licensed MIT. It adds 68 tokens to every session and 997 once invoked, about $0.0003 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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