Expand Writing

Turn a rough draft ("verbal vomit") into polished technical prose, calibrated to the audience the user describes. The skill applies a vendored style ruleset (rules.md in this skill's directory) and a jargon-density dial based on the audience.

Parse the argument

The argument string must contain:

• --out (required) — destination file. Detect the output format from the extension:
• .tex → LaTeX
• .md / .markdown → Markdown
• Any other extension → stop and ask the user which format to produce.
• --audience "" (required) — free-form description of the intended reader. Must be quoted (single or double) so it can contain spaces.
• Everything remaining (after --out and --audience "..." are removed) is the input. Strip surrounding whitespace, then:
• If the remainder, treated as a path, resolves to an existing file, read it as the input.
• Otherwise, treat the literal remainder as inline prose to expand.

Stop and ask the user if:

• --out is missing.
• --audience is missing.
• The remainder is empty (no input to expand).
• The --out extension is neither .tex nor .md / .markdown.
• The --out path already exists (confirm before overwriting; do not auto-overwrite).

Steps

1. Resolve inputs. Parse the flags. Read the input (file contents or inline text). Detect the input format: .tex source, .md source, or plain prose (neither → treat as plain).

1. Characterize the audience. From the free-form --audience description, infer three internal tags:

• Background: one of domain-expert, adjacent-field, informed-layperson, general-public.
• Register: one of formal, semi-formal, conversational.
• Jargon tolerance: one of keep-as-is, gloss-on-first-use, replace-with-plain-term.

Record these three tags in one short sentence at the top of the change log so the user can sanity-check the calibration.

1. Load the rules. Read rules.md from this skill's directory. Apply every rule during the rewrite; cite rule IDs (R01, R03, R04, R06, R08, R11, R12, RA, RB, RF, RH, RI) in the change log.

1. Draft the rewrite. Produce a polished version of the input that:

• Applies every rule in rules.md.
• Calibrates vocabulary to the jargon-tolerance tag from step 2 (see "Jargon calibration" below).
• Preserves all factual content. No fabricated numbers, citations, or claims. If the draft is vague, flag the gap in the change log instead of inventing specifics.
• When the input is LaTeX, preserves macros, \cite{...}, \ref{...}, \label{...}, \includegraphics{...}, and all math environments (equation, align, align*, \[...\], inline $...$). Do not rewrite inside any of these.
• Matches the output format:
• Markdown input → LaTeX output: headings → \section{...} / \subsection{...}, - lists → itemize, 1. lists → enumerate, inline ` code → \texttt{...}, fenced code blocks → verbatim. Escape special LaTeX characters (& % _ # $ ~ ^ \`) outside verbatim.
• LaTeX input → Markdown output: strip conservative macros (\emph{x} → *x*, \textbf{x} → **x**, \texttt{x} → ` x , \section{x} → ## x). For anything without a clean Markdown equivalent (custom macros, \cite{}`, complex floats), leave the LaTeX as-is and warn in the change log.
• Same-format pass-through: keep structural markup as-is; rewrite only the prose.

1. Write the rewrite to the --out path. Never touch the input file. If the output file exists, confirm before overwriting.

1. Print a change log to the chat (not to disk), structured as:

``` Audience calibration: / / .

Notable edits: [R04] "in order to evaluate" → "to evaluate" [R06] "leverage" → "use" [RF] acronym "RAG" defined on first use as "retrieval-augmented generation" [R11] reordered sentence to place "23% lower error" at the end [R03] vague "several datasets" — flagged; input did not name them ... (up to ~10)

Gaps flagged but not filled:

Style rules adapted from The Elements of Agent Style (https://github.com/yzhao062/agent-style), CC BY 4.0. ```

Keep the change log short. If no edits were needed, say so in one line and include only the calibration and attribution.

Jargon calibration

The upstream ruleset tells the agent to name the reader (R01) but does not specify how to tune vocabulary once a reader is named. Use this dial:

• domain-expert → keep-as-is. Use field-standard jargon freely. Define only novel or niche terms introduced by the draft itself.
• adjacent-field → gloss-on-first-use (selective). Define field-specific acronyms and methods on first use. Keep well-known shared vocabulary (gradient, regression, REST API) without gloss.
• informed-layperson → gloss-on-first-use (aggressive). On first use of any technical concept, add a one-clause gloss: fine-tuning — further training a model on task-specific data. Prefer the plain term in follow-up mentions when it reads naturally.
• general-public → replace-with-plain-term. Default to plain English. Use a technical term only when no plain equivalent exists, and always gloss it. Drop internal-jargon shorthand even if it is "one word shorter."

Hard rules regardless of dial:

• Never strip a term that is load-bearing for correctness. If the plain-English replacement would mislead, keep the term and gloss it instead.
• Never invent a gloss. If you are not confident about the definition, flag the term in the change log and leave it unchanged.
• Do not add glosses to terms that already appear with a gloss elsewhere in the same document — track first-mention state across the rewrite.

Rules while running

• Never modify the input file.
• Never overwrite the output file without user confirmation.
• Do not fabricate citations, numbers, or claims that are not present in the input.
• Preserve the author's voice and intent. This skill rewrites; it does not co-author.
• If the input already meets the style bar for the stated audience, say so in the change log and pass it through largely unchanged.
• Do not commit anything.
• The attribution line in the change log must always be present; removing it violates the CC BY 4.0 terms on the vendored rules.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: ExplorerFreda
• Source: ExplorerFreda/fskills
• License: Apache-2.0

Install and usage instructions live in the source repository linked above.