| name | vale-style-rules |
| description | Resolves Vale prose linter warnings and errors in documentation. Use when fixing Vale issues in PRs, when the user reports Vale errors or warnings, when editing docs and Vale is mentioned, or when prose/grammar style compliance is requested. |
Vale Style Rules
Apply this skill when resolving Vale linter output or when editing docs where Vale style applies.
Verification required
You MUST run pnpm run vale <filename> on the edited document and confirm 0 errors, 0 warnings, and 0 suggestions before finishing. Do not consider the task complete until Vale reports a clean result.
When to use
- Fixing Vale errors or warnings in a PR or file
- User asks to fix Vale issues or follow Vale style
- Editing documentation and prose/grammar style is in scope
Quick reference
Must fix (errors)
- Headings: Sentence-style capitalization (first word + proper nouns only). Add product-name exceptions in
.vale/styles/StyleRules/Headings.yml if needed.
- Spacing: One space after sentence-ending punctuation; no spaces around em/en dashes. Use a colon (not em dash) after a label/bold phrase that introduces an explanation.
- Em dashes: Use em dashes only to connect related sentence fragments in body content—like this. Never use em dashes in list items; use colon-separated format (e.g.
- Bring Your Own Keys: Manage provider API keys centrally).
- Oxford comma: Use comma before "and"/"or" in lists of three or more.
- Frontmatter: Every doc needs a
description field (~150 chars, ends with a period).
Should fix (warnings)
- Person: Address the reader as "you"; avoid first-person (we, our, let's). Exceptions: "Let's Encrypt", "US". Ignore first-person inside bold (e.g. My Local Webhook)—that is UI text and must not be edited.
- Time: "3:00 PM" / "9:30 AM" (space, uppercase, no periods).
- Dates: "Month Day, Year" (e.g. July 31, 2016).
- Ellipses: Use
… not ....
- Tone: No exclamation points; use they/them/their (gender-neutral).
- Headings: No period at end of heading.
- Latin: Use "for example", "that is" instead of e.g., i.e.
- Hyphens: No hyphen after -ly words (e.g. "recently updated" not "recently-updated").
- Plurals: Avoid optional plural in parentheses (e.g. "user(s)"); choose singular or plural.
- Acronyms: No periods (API, HTTP, not A.P.I.).
- Spelling: American (e.g. organized, color, center).
- ngrok terms: Capitalize Traffic Policy, Kubernetes Operator, Traffic Inspector, Cloud Endpoint, Agent Endpoint.
Full reference
For error/warning text, examples, and exceptions, see reference.md.
