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 LichAmnesia/unreal-engine-agent-skills --skill ue5-feature-maturity-gategit clone --depth 1 https://github.com/LichAmnesia/unreal-engine-agent-skillsWrote 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/lichamnesia/unreal-engine-agent-skills/ue5-feature-maturity-gate)<a href="https://agentmods.dev/skills/lichamnesia/unreal-engine-agent-skills/ue5-feature-maturity-gate"><img src="https://agentmods.dev/badge/skills/lichamnesia/unreal-engine-agent-skills/ue5-feature-maturity-gate/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/lichamnesia/unreal-engine-agent-skills/ue5-feature-maturity-gate"><img src="https://agentmods.dev/badge/skills/lichamnesia/unreal-engine-agent-skills/ue5-feature-maturity-gate.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00110 | $0.01423 |
| Opus 5 | $0.00055 | $0.00711 |
| Sonnet 5 | $0.00022 | $0.00285 |
| Haiku 4.5 | $0.00011 | $0.00142 |
Grade A, and why
ue5-feature-maturity-gate 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 11d 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 — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Feature Maturity Gate
Language models are least reliable about exactly one thing in engine work: what is true in your version. Training data averages across years of releases, so a feature that was Experimental for three versions, shipped as Beta, and is now Production Ready has all three states represented in what the model learned, with no reliable way to tell which one applies to you. The answer arrives confident and unlabeled either way.
This produces two failures that look nothing alike:
- Building on sand. A feature adopted as though stable turns out to be Experimental in your version — its API changes under you at the next upgrade, and its edge cases are documented nowhere because it was never meant to be relied on yet.
- Refusing free capability. A feature avoided as "experimental" that has actually been production-ready for several versions, so the project hand-rolls a worse version of it.
Both are avoidable in about five minutes, using evidence that is already on your disk.
Determine maturity before committing to a feature
- Never accept a maturity claim without a version. "Substepping is experimental" is not a statement about your project until it names an engine version. Treat unversioned claims — from a model, a tutorial, or a memory — as unverified.
- Check on this machine. Plugin descriptors, editor labels, deprecation macros, and
console variable help all carry maturity information in the installed engine. The
procedures are in
references/maturity-discovery.md. - Apply the guardrails for the level you found, not the level you hoped for. Experimental
is not forbidden — it is permitted with containment. See
references/decision-rules.md. - Record the finding with its evidence and date in the project context file. A maturity claim with no evidence is the thing this skill exists to prevent, and writing one down makes it authoritative for everyone after you.
- Re-check on upgrade. Maturity is the most upgrade-volatile fact in a project. See
references/drift-and-upgrade.md.
What ships with it
4 files 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.
- 11d ago First seen · 108 lines · 110 tokens per session scan A 89095eb6ee6e
ue5-feature-maturity-gate is a skill published in the GitHub repository LichAmnesia/unreal-engine-agent-skills (5 stars, last pushed 26d ago), licensed MIT. It adds 110 tokens to every session and 1,423 once invoked, about $0.0006 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 2026-08-31.
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