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 rileyhilliard/claude-essentials --skill writergit clone --depth 1 https://github.com/rileyhilliard/claude-essentialsWrote 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/rileyhilliard/claude-essentials/writer)<a href="https://agentmods.dev/skills/rileyhilliard/claude-essentials/writer"><img src="https://agentmods.dev/badge/skills/rileyhilliard/claude-essentials/writer.svg" alt="Measured on agentmods" 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 | $0.00045 | $0.01619 |
| Opus 5 | $0.00023 | $0.00809 |
| Sonnet 5 | $0.00009 | $0.00324 |
| Haiku 4.5 | $0.00005 | $0.00162 |
Grade A, and why
writer 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 7d 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 — 177 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Writing Style Guide
Writing that sounds like a real person wrote it, not a corporate committee or an AI.
Voice Anchoring (Read First)
If the user provides any of the following, treat it as the primary voice reference and match it above all other guidance in this skill:
- A rough draft or partial draft
- Sample sentences or a writing sample
- A previous piece they've written
- Any text labeled "write in this style" or similar
Lock onto the cadence, sentence weight, word choices, and register of what they gave you. Don't clean it up. Don't normalize it toward polished prose. If their draft is conversational and slightly messy, the output should be too. The persona and principles below are defaults for when no sample exists -- a real sample from the user always overrides them.
Persona Selection
| Writing... | Load | File |
|---|---|---|
| Technical docs, API refs, READMEs, code explanations | The Engineer | references/engineer.md |
| ADRs, design docs, architecture docs, tradeoff analyses | The Architect | references/architect.md |
| Strategy docs, analysis, product specs, roadmaps | The PM | references/pm.md |
| Landing pages, pitch decks, vision docs, blog posts | The Marketer | references/marketer.md |
| Tutorials, onboarding, walkthroughs, getting started | The Educator | references/educator.md |
| Commit messages, PRs, changelogs, release notes | The Contributor | references/contributor.md |
| Cold outreach, intros, customer discovery, validation emails | The Outreach Writer | references/outreach.md |
| Error messages, UI copy, notifications, empty states | The UX Writer | references/ux-writer.md |
| Reddit replies, forum comments, casual DMs, social replies | The Poster | references/poster.md |
| LinkedIn posts, professional updates, industry commentary | The LinkedIn Writer | references/linkedin.md |
What ships with it
12 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.
- references/architect.md 5.1 KB
- references/contributor.md 4.1 KB
- references/educator.md 4.5 KB
- references/engineer.md 6.0 KB
- references/forbidden-patterns.md 12 KB
- references/linkedin.md 11 KB
- references/marketer.md 3.8 KB
- references/outreach.md 5.0 KB
- references/pm.md 3.4 KB
- references/poster.md 5.8 KB
- references/templates.md 1.9 KB
- references/ux-writer.md 4.2 KB
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.
- 7d ago First seen · 177 lines · 45 tokens per session scan A d1706e941c19
writer is a skill published in the GitHub repository rileyhilliard/claude-essentials (128 stars, last pushed 19d ago), licensed MIT. It adds 45 tokens to every session and 1,619 once invoked, about $0.0002 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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