write-prose

write-prose is a skill for Claude Code from leifericf/agentic-sdk. It costs 65 tokens per session (2,364 once invoked), scanned A, original, MIT.

A writing guide for English produced by the project, including comments, documentation, commit messages, changelogs, and error messages.

In plain words
What is it for?
Use it whenever you write or edit English prose in the codebase.
Why use it?
It keeps project text short, clear, human-sounding, and consistent across different files and contributors.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: mentions CLAUDE.md.

Good fit Use it whenever you write or edit English prose in the codebase.

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Install with agentmods
npx agentmods add skills/leifericf/agentic-sdk/write-prose
Install

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.

Any agent
npx skills add leifericf/agentic-sdk --skill write-prose
Clone the repo
git clone --depth 1 https://github.com/leifericf/agentic-sdk

Made for: Claude Code.

Wrote 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.

agentmods badge for write-prose

README.md
[![agentmods](https://agentmods.dev/badge/skills/leifericf/agentic-sdk/write-prose.svg)](https://agentmods.dev/skills/leifericf/agentic-sdk/write-prose)
Your own site
<a href="https://agentmods.dev/skills/leifericf/agentic-sdk/write-prose"><img src="https://agentmods.dev/badge/skills/leifericf/agentic-sdk/write-prose.svg" alt="Measured on agentmods" height="20"></a>
Per session 65 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,364 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00065 $0.02364
Opus 5 $0.00032 $0.01182
Sonnet 5 $0.00013 $0.00473
Haiku 4.5 $0.00006 $0.00236

Measured 4d ago against content hash a8e3e46cfc37, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

write-prose 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 4d 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.

skills/write-prose/SKILL.md · 235 lines

How it starts

The opening of the file, as written. The whole thing — 235 lines — stays where its author put it; the contents beside it link to each section on GitHub.

write-prose

Invoke this skill for any English you produce in this project: commits, comments, docstrings, ADRs, design docs, skill bodies, changelog, error messages, project guides. If you are about to write a sentence of prose, invoke this first.

Read this before writing: skills/shared/references/style-foundations.md, the canonical craft reference. It distills Strunk and White's Elements of Style and Zinsser's On Writing Well into the eight load-bearing rules, and catalogs the AI tells the project bans.

Also read for project-specific surfaces: skills/shared/references/prose-style.md, the project's surface conventions (commit format, ADR format, code-comment idioms, the no-process-ID rule).

The stance: terse, humanized, no tells

Write like a person who respects the reader's time. Not like a machine hedging its output. The default failure mode for AI prose is over-production: too many words, decorative em dashes, sympathetic throat-clearing, false-affinity adjectives (powerful, robust, seamless). Reject that default at every sentence.

The four non-negotiables:

  1. Terse. Omit needless words. The first draft is too long; the second is shorter. If a sentence can be cut and lose no meaning, cut it.
  2. Humanized. Write like a careful person, not a helpful machine. No apologetic throat-clearing, no false brightness. No filler.
  3. No em dashes. Never the em dash character. Restructure: a comma, a colon, a period, or a rewrite. Reaching for the em dash means the sentence is doing too much.
  4. No AI tells. No arrow in prose, no hand-written or hand-rolled, no false-affinity adjectives, no hollow hedging, no rhetorical-question transitions, no in order to (just to), no utilize or leverage (just use), no There is openers, no trendy intensifiers (really, very, super). The full catalog is in style-foundations.md.

The voice (every surface)

  • Plain, direct, technical. No metaphors, no cleverness in names or headings. A reader six months from now gets the plain meaning on first read.
  • Active voice; present tense for current behavior, past tense for history.
  • State constraints and effects, not narrative.
  • No marketing adjectives. If a property matters, state the measurement or the mechanism.
  • Factual, neutral, accurate. State what the thing is and what it does, not how it feels or how exciting it is. No editorial comparisons ("improves on X"); state the factual difference and let the reader judge.

Read the full file on GitHub · 235 lines

Changes

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.

  1. 4d ago First seen · 235 lines · 65 tokens per session scan A a8e3e46cfc37

Subscribe to this mod's changes

write-prose is a skill published in the GitHub repository leifericf/agentic-sdk (5 stars, last pushed 6d ago), licensed MIT. It adds 65 tokens to every session and 2,364 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 2026-09-03.

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