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 jamiemill/layers-skills --skill layers-introgit clone --depth 1 https://github.com/jamiemill/layers-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/jamiemill/layers-skills/layers-intro)<a href="https://agentmods.dev/skills/jamiemill/layers-skills/layers-intro"><img src="https://agentmods.dev/badge/skills/jamiemill/layers-skills/layers-intro/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/jamiemill/layers-skills/layers-intro"><img src="https://agentmods.dev/badge/skills/jamiemill/layers-skills/layers-intro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk 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 | $0.00024 | $0.01996 |
| Opus 5 | $0.00012 | $0.00998 |
| Sonnet 5 | $0.00005 | $0.00399 |
| Haiku 4.5 | $0.00002 | $0.00200 |
Grade C, and why
layers-intro scanned grade C with 1 finding 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.
Tells the agent never to refusehighAnti-refusal
Suppressing the ability to decline removes a core safety control; a later harmful request then succeeds.
10. **Push forward, pull back.** The layers aren't a one-way climb. When the work at a layer feels unjustified or floating — you're elaborating structure with no clear reason to — it's often because you can't yet see wha How it starts
The opening of the file, as written. The whole thing — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/layers-intro
Load this skill at the start of any design session. It provides the framework context that all other /layers-* skills depend on.
The framework
Layers of Product Design organises design work into seven layers across three zones. Layers have logical dependency: lower layers are foundations for upper ones. Weak lower layers create UX debt that propagates upward.
Reality — complex, contradictory, evolving. Source of all learning.
Problem space — knowledge gathered from reality:
- Observed behaviour — what users actually do
- The domain — concepts, terminology, and mental models that exist independently of any product
- User needs — what we think users are trying to achieve, and why
Solution space — deliberate decisions about what to build: 4. Product & service strategy — which needs to serve, and what business outcomes to target 5. Conceptual model — objects, relationships, states, vocabulary — independent of any interface 6. Interaction structure and flow — places, affordances, connections, and flow logic 7. Surface — words, visuals, feedback, hierarchy — what users actually encounter
The layers are not a linear process. Enter anywhere — but always check whether the foundations below are sound.
Inspired by Jesse James Garrett's The Elements of User Experience (2000).
Design is decision-making
Design = making decisions about the form of a solution (Christopher Alexander). Form is the solution; context is the requirements, constraints, and environment it must fit. Good design is good fit.
Four kinds of progress:
- Making decisions — resolving something undecided
- Uncovering unmade decisions — discovering what hasn't been decided yet (often more valuable than 1)
- Evaluating decisions — identifying decisions already made that are risky, inconsistent, or wrong
- Prioritising decisions — lower layers are more foundational and carry more risk if wrong
The job of every skill is to help the designer make better decisions — not to make decisions for them.
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 · 126 lines · 24 tokens per session scan C 724549b81bc5
layers-intro is a skill published in the GitHub repository jamiemill/layers-skills (299 stars, last pushed 3mo ago), licensed MIT. It adds 24 tokens to every session and 1,996 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it C with 1 finding (tells the agent never to refuse). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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