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 macintog/codex-spine --skill prose-qualitygit clone --depth 1 https://github.com/macintog/codex-spineWrote 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/macintog/codex-spine/prose-quality)<a href="https://agentmods.dev/skills/macintog/codex-spine/prose-quality"><img src="https://agentmods.dev/badge/skills/macintog/codex-spine/prose-quality/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/macintog/codex-spine/prose-quality"><img src="https://agentmods.dev/badge/skills/macintog/codex-spine/prose-quality.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 | $0.00060 | $0.00389 |
| Opus 5.5 | $0.00024 | $0.00156 |
| Sonnet 5.5 | $0.00012 | $0.00078 |
| Haiku 4.5 | $0.00006 | $0.00039 |
Grade A, and why
prose-quality 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 19d 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
Prose quality
An edit succeeds only if readers draw the same conclusions from the new text, with less effort.
Keep meaning fixed
- Keep each claim at its original strength and scope. Carry over hedges, conditions, sample sizes, units, hardware, baselines, and "experimental" or "may not" limits. Never turn "did not measure X" into "X was unchanged."
- Add no facts, numbers, or benefits the source lacks. Ask, or leave a marked gap.
- Preserve commands, paths, flags, symbols, quotations, and normative text (MUST, SHOULD) exactly.
- When the text describes code or a tool you can read, check its behavioral claims against it. Fix or flag mismatches and say what you checked.
Edit to the requested depth
- Review only: return findings ranked by reader impact, errors (wrong, ambiguous, out of order) before style. No rewrite.
- Editing: keep the author's voice, terms, structure, and the document's conventions (heading case, quote style, spelling). One name per concept.
Remove generated-sounding patterns
Cut puffery, signposting, filler, stacked hedges, summary closers, and decorative bold, emoji, or headers. Thin out em-dash chains, "not X but Y" contrasts, and forced triplets without substituting another tic. Keep a negation that states a real limit or hazard.
Before returning
Compare old and new for any claim that got stronger, weaker, or lost a qualifier. Name material ambiguities instead of writing around them.
What ships with it
2 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.
- 19d ago Changed · -48 lines · -8 tokens per session 08398c7d2b7f
- 1mo ago First seen · 73 lines · 68 tokens per session scan A 339672df9da8
prose-quality is a skill published in the GitHub repository macintog/codex-spine (12 stars, last pushed yesterday), licensed MIT. It adds 60 tokens to every session and 389 once invoked, about $0.0002 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 2026-09-19.
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