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.
git clone --depth 1 https://github.com/ConlinJoe/ai-platformWrote 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/rules/conlinjoe/ai-platform/40-ui)<a href="https://agentmods.dev/rules/conlinjoe/ai-platform/40-ui"><img src="https://agentmods.dev/badge/rules/conlinjoe/ai-platform/40-ui/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/rules/conlinjoe/ai-platform/40-ui"><img src="https://agentmods.dev/badge/rules/conlinjoe/ai-platform/40-ui.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 | $0.00027 | $0.09119 |
| Opus 5.5 | $0.00011 | $0.03648 |
| Sonnet 5.5 | $0.00005 | $0.01824 |
| Haiku 4.5 | $0.00003 | $0.00912 |
Grade A, and why
40-ui 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 4d 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 — 1,016 lines — stays where its author put it; the contents beside it link to each section on GitHub.
UI / UX
Canonical UI router. Use the smallest appropriate design-skill set. Do not load multiple design skills by default or dump reference corpora into context.
Instruction priority (00-platform) still applies: project/harness rules
outrank Impeccable and Hallmark. Vendor skills do not authorize browser
automation beyond what 60-browser-qa allows.
These platform-owned design and usability constraints outrank design skills. If a design skill recommends a technique prohibited here, do not use it. Do not modify vendor content to encode developer preferences. Keep those preferences in this rule.
Design philosophy: product-specific, spacious, hierarchy-driven design. The interface exists to help the user complete the current task. Avoid recognizable AI/template conventions. These are usability and craft principles, not a native-platform imitation guide.
Design-system ownership
If the project already has tokens, a Tailwind/theme config, a component
library, a design contract, design.md / DESIGN.md, or equivalent
project-owned design documentation, that system is authoritative.
Reuse and extend existing tokens, typography, components, spacing rules, and interaction patterns before inventing replacements. A design skill must not silently create a parallel design system.
If an approved visual reference, design brief, or locked design.md
exists, treat it as higher-authority creative direction than a skill
default.
Design skills never outrank: approved project design briefs, approved
visual references/comps, project tokens/components/design systems,
accessibility requirements, or this global UI floor. Resolve conflicts
among those authorities through 00-platform instruction priority.
Impeccable or Hallmark may reason within the established system or propose a deliberate evolution. A skill must not silently replace it. If the task requires changing the established system, say so explicitly before drifting.
Load relevant feature contracts from docs/README.md (design system, page
behavior, component contracts) before implementing. Update those contracts
when user-visible behavior changes.
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.
- 4d ago Changed · +6 lines a649f20ba051
- 5d ago Changed · +3 lines 54c074d46172
- 7d ago Changed · +79 lines ba2c50095f98
- 1mo ago Changed · +91 lines · +8 tokens per session 21e0d884e5fa
- 1mo ago Changed · +115 lines · -3 tokens per session 468f9397efaf
- 1mo ago Changed · +133 lines 6d91e6856c0a
- 2mo ago First seen · 589 lines · 22 tokens per session scan A 860565b1d6e8
40-ui is a cursor rule published in the GitHub repository ConlinJoe/ai-platform (2 stars, last pushed 4d ago), licensed MIT. It adds 27 tokens to every session and 9,119 once invoked, about $0.0001 per session on Opus 5.5. 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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