Validation messages brief no end punctuation
validation-messages-brief-no-end-punctuation
Validation messages brief; no end punctuation unless multiple sentences.
Description
Fluent validation messages stay brief so the fix is scannable beside the field. A single sentence takes no end punctuation; add punctuation only when the message needs multiple sentences. Apply when writing Fluent field validation after input fails checks, not multi-sentence helper text. Fail single-sentence validation with a trailing period, or long un-brief validation copy.
When to use
Writing Fluent field validation messages after input fails checks.
Not when
Multi-sentence help text under the field — that is helper-text guidance.
Agent hint
Keep validation brief; no trailing period on a single sentence.
Brief validation; no end punctuation on a single sentence; punctuation only if multiple sentences.
Single-sentence validation with a trailing period, or long un-brief validation.
Citations
Fluent 2 — Field usage
https://fluent2.microsoft.design/components/web/react/core/field/usage