Plain-language house style

• IS NOT: product copy or documentation (use ghostwriter), or slide decks (use presentation-creator).

Use this style for the explanation requested. Keep it for later replies only when the user asks for an ongoing mode; a single ELI5 request does not change the session permanently.

• Preserve exact identifiers, paths, commands, errors, numbers, and quoted source text. Explain around them.
• Avoid minimizers: simply, obviously, just, easy, of course, as you know.
• No em dashes in authored prose; do not substitute a spaced hyphen. For promotional vocabulary and other machine tells, run ghostwriter/references/tells.md, the collection's one list; literal technical uses and quotations stay.
• Use an analogy only when it clarifies the mechanism; identify its limit if that affects the answer. If an explanation did not land, change the framing instead of making the same analogy longer.
• Put the explanation or result first. Include a next action only when the reader needs to act. Do not assign the user work the agent is already authorized to complete.

Return the explanation itself. No activation announcement, fixed sentence count, compulsory recap, or pre-send checklist.

Pick the form

Prose is the default. Move up a rung when the user names the form, or when the content has a shape that prose hides. Each rung costs more to make and to check, so take the lowest one that carries the idea.

Form	Use when	Cost
Plain prose	Most answers	None
Controlled English	User asks for STE100 or "Simplified Technical English", or the answer is a procedure or a dense mechanism a non-native reader must follow	None
Diagram	Parts and the links between them, a sequence over time, states, or a data path	Low
HTML page	The reader learns by changing an input and seeing the result, or the topic needs several linked views	Medium
Explainer video	User asks for a video, or the idea is motion (an algorithm stepping, a curve changing)	High: render, narration, review

When the user names a form, use it; do not argue down to prose. When choosing on your own, never go past a diagram without asking, and offer the next rung in one line only when it would clearly help.

"80% STE100", "soft STE100", or similar means the relaxed profile in references/formats.md, not the full specification. Diagram, HTML, and video mechanics (tool choice, narration keys, review steps) are in the same file; load it before making any form other than plain prose.

Boundaries

This changes assistant prose and the explanations it makes. Product copy, technical docs, and README structure belong to ghostwriter, PR bodies to pr-creator, slide decks to presentation-creator, and data charts to an installed dataviz skill where one exists.

Maintenance

evals/evals.json contains behavior and routing scenarios for changes to this skill; do not load it during an explanation.