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 jnPiyush/AgentX --skill content-designgit clone --depth 1 https://github.com/jnPiyush/AgentXWrote 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/jnpiyush/agentx/content-design)<a href="https://agentmods.dev/skills/jnpiyush/agentx/content-design"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/content-design/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/jnpiyush/agentx/content-design"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/content-design.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 | $0.00066 | $0.01873 |
| Opus 5.5 | $0.00026 | $0.00749 |
| Sonnet 5.5 | $0.00013 | $0.00375 |
| Haiku 4.5 | $0.00007 | $0.00187 |
Grade A, and why
content-design 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 1mo 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 — 181 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Content Design
WHEN: A prototype or shipped surface contains user-facing text -- labels, buttons, empty states, errors, tooltips, onboarding, confirmations, system messages. This skill is the Frontier canonical content guide. Heuristic H2/H9/H10 from
usability-heuristicsdefers to this skill for the specific copy patterns.
When to Use This Skill
- Writing or reviewing any string a user will read
- Replacing placeholder copy during prototype handoff
- Localizing or rewriting error messages
- Designing onboarding, empty states, or zero-data screens
- Reviewing AI-generated UI text for clarity and safety
Authoritative Sources
| Source | Focus |
|---|---|
| GOV.UK Service Manual -- Content design | Plain language, accessibility |
| Mailchimp Content Style Guide | Voice and tone |
| Microsoft Writing Style Guide | Inclusive, action-first wording |
| Shopify Polaris Content guidelines | Commerce and dashboard patterns |
| Nielsen Norman Group articles on error and empty states | Empirical UX research |
Quote sources in PRD-level decisions; do not cite them inline in production copy.
Voice Rubric (5 lines, applied to every string)
- Clear over clever. If the user has to re-read, rewrite.
- Active and direct. "Save changes" beats "Changes can be saved."
- Front-load the action or outcome. First two words carry the meaning.
- Honest about state. Do not say "saved" before the network round-trip resolves.
- Inclusive and neutral. Avoid idioms, gendered defaults, and culture-specific jokes.
Length Budgets
| Surface | Budget | Notes |
|---|---|---|
| Primary button | 1-3 words, verb-first | "Save", "Send invite", "Delete project" |
| Secondary button | 1-3 words | Pairs with primary; never both verbs that look the same |
| Form label | 1-4 words | Persistent; never replaced by placeholder |
| Field hint (helper text) | <=80 chars | Stays visible; explains constraint |
| Inline error | <=120 chars | What is wrong + how to fix |
| Toast | <=140 chars | Plus optional action link |
| Empty state heading | <=8 words | What this surface is for |
| Empty state body | <=160 chars | One sentence + one action |
| Tooltip | <=120 chars | Single concept; no nesting |
Page title (<title>) |
<=60 chars | "Page name -- App name" |
| Dialog confirmation body | <=200 chars | State the consequence, name the target |
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.
- 1mo ago Changed 6e551b2be1f1
- 1mo ago First seen · 181 lines · 66 tokens per session scan A a6a1b2ec74c3
content-design is a skill published in the GitHub repository jnPiyush/AgentX (16 stars, last pushed 3d ago), licensed Apache-2.0. It adds 66 tokens to every session and 1,873 once invoked, about $0.0003 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 2026-09-03.
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