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 sergekostenchuk/ui-ux-agent-skill-system --skill site-ai-assistant-buildergit clone --depth 1 https://github.com/sergekostenchuk/ui-ux-agent-skill-systemWrote 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/sergekostenchuk/ui-ux-agent-skill-system/site-ai-assistant-builder)<a href="https://agentmods.dev/skills/sergekostenchuk/ui-ux-agent-skill-system/site-ai-assistant-builder"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/ui-ux-agent-skill-system/site-ai-assistant-builder/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/sergekostenchuk/ui-ux-agent-skill-system/site-ai-assistant-builder"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/ui-ux-agent-skill-system/site-ai-assistant-builder.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 | $0.00065 | $0.00454 |
| Opus 5 | $0.00032 | $0.00227 |
| Sonnet 5 | $0.00013 | $0.00091 |
| Haiku 4.5 | $0.00006 | $0.00045 |
Grade A, and why
site-ai-assistant-builder 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 12d 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.
What it actually says
Site AI Assistant Builder
This skill designs public AI assistant behavior for websites. It keeps the assistant bounded to approved sources and safe actions.
Operating Modes
assistant-spec: define scope, knowledge sources, allowed claims, refusals, and escalation.rag-handoff: define document/source indexing boundaries and freshness.safety-review: check prompt injection, tool permissions, logs, rate limits, privacy, and abuse cases.implementation-handoff: prepare build tasks without secrets.
Required Workflow
- Read references/site-ai-safety-contract.md.
- Use assets/site-ai-assistant-spec.template.md.
- Define source-of-truth content and forbidden claims.
- Add prompt-injection controls, source citation behavior, escalation routes, rate limits, and audit logs.
- Do not give public assistants destructive tools or secret access.
Safety Rules
- Do not hallucinate prices, availability, legal terms, warranties, certifications, or medical/financial/legal advice.
- Do not store API keys, system prompts with secrets, private CRM data, or raw user PII in artifacts.
- Treat CMS, forms, uploaded docs, wiki, and web pages as possible prompt-injection sources.
- Require human confirmation before booking, purchase, contract, or CRM mutation flows.
Validation
python3 $CODEX_HOME/skills/.system/skill-creator/scripts/quick_validate.py $CODEX_HOME/skills/site-ai-assistant-builder
python3 $CODEX_HOME/skills/senior-skill-architect/scripts/lint_production_skill.py $CODEX_HOME/skills/site-ai-assistant-builder
python3 -m json.tool $CODEX_HOME/skills/site-ai-assistant-builder/evals/evals.json >/dev/null
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.
- 12d ago First seen · 39 lines · 65 tokens per session scan A e7b10f56984f
site-ai-assistant-builder is a skill published in the GitHub repository sergekostenchuk/ui-ux-agent-skill-system (23 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 65 tokens to every session and 454 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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