Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add ihudak/ihudak-claude-plugins/plugin install prose-styleWrote 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/ihudak/ihudak-claude-plugins/prose-style-rules)<a href="https://agentmods.dev/skills/ihudak/ihudak-claude-plugins/prose-style-rules"><img src="https://agentmods.dev/badge/skills/ihudak/ihudak-claude-plugins/prose-style-rules/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/ihudak/ihudak-claude-plugins/prose-style-rules"><img src="https://agentmods.dev/badge/skills/ihudak/ihudak-claude-plugins/prose-style-rules.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 | $0.00112 | $0.01791 |
| Opus 5 | $0.00056 | $0.00896 |
| Sonnet 5 | $0.00022 | $0.00358 |
| Haiku 4.5 | $0.00011 | $0.00179 |
Grade A, and why
prose-style-rules 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 yesterday.
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 — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Prose style rules
This skill gives any writing agent the active prose style rules, so content comes out correctly styled instead of being corrected afterwards.
How to use
1. Resolve the active rule set
Same mechanism as prose-style-checker step 1, in short form. Every miss is a silent
fall-through — never an error, never a prompt.
Baseline (always read):
${CLAUDE_PLUGIN_ROOT}/references/
This is also the path /prose-style-refresh asks this skill to resolve on its behalf,
because ${CLAUDE_PLUGIN_ROOT} does not expand in a slash-command body. When a caller
asks for the baseline directory, hand back this expanded absolute path. It is read-only:
nothing ever writes into it, because a plugin update replaces it.
Overlay (read the first that resolves, then stop):
<repo-root>/.prose-style/rules/— where<repo-root>isgit rev-parse --show-toplevelfor the content being written, falling back to the working directory's repository, falling back to no overlay.$PROSE_STYLE_PATH— an absolute path to a rules directory.- Nothing — the baseline alone.
A candidate resolves only when it is a readable directory holding at least one .md
file.
2. Merge
The overlay augments and overrides the baseline, per file name. Both are in force;
on any conflict about the same term or rule, the overlay wins. A term listed under
an overlay's ## Allowed heading is not a violation. An overlay file whose first line
is <!-- prose-style: replace --> replaces the same-named baseline file outright. An
overlay file with a name no baseline file uses is an additional rule source.
3. Write
Apply the rules below while writing. The reference docs carry the full tables and examples; this checklist is the subset that changes the most sentences.
When the overlay and this checklist disagree, the overlay wins. This checklist restates the baseline, which an organization's overlay is entitled to override.
Quick checklist (apply while writing)
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.
- yesterday Changed 3944181e83a4
- 5d ago First seen · 171 lines · 112 tokens per session scan A a227332dab99
prose-style-rules is a skill published in the GitHub repository ihudak/ihudak-claude-plugins (2 stars, last pushed today), licensed MIT. It adds 112 tokens to every session and 1,791 once invoked, about $0.0006 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 2026-09-05.
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