Some brand voice rules can be enforced like unit tests: define an observable requirement, then make a validator report whether a draft passes. A writing-style repository offers a concrete example: it bans em dashes and en dashes, with enforcement through a pre-commit hook and a validator. That works for a precise punctuation rule, not for every judgment involved in writing well.
What makes a writing rule a useful test?
A rule is a good candidate for automation when it is specific, observable, and has a clear pass-or-fail result. “Do not use the em dash or en dash characters” can be checked directly. “Sound warm and human” cannot be reduced so reliably to a binary test.
The repository example makes the distinction tangible: it defines two forbidden characters and reports that a pre-commit hook and validator enforce the rule. The check can catch a violation consistently, but it cannot determine whether the surrounding sentence is clear, empathetic, or right for its audience.
Which parts of brand voice can be automated?
Mechanical rules are the strongest candidates: punctuation, spelling variants, preferred terminology, and simple structural requirements. They need explicit definitions. A rule such as “use our preferred spelling” should identify the approved form and the alternatives the checker should flag.
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Microsoft describes voice as the way a message is expressed and distinguishes a consistent voice from tone that adapts to context. Its framework is a useful reminder that a brand can have a stable personality while changing its tone for a customer’s situation. Applying that distinction to automation is an editorial judgment: a script may spot a prohibited term, but it cannot reliably decide whether a response is appropriately reassuring or direct in context.
Why ban the em dash?
An em dash ban is a house-style decision, not a universal punctuation rule. Published guidance differs: WordPress advises against em dashes, Google recommends one to mark a break or interruption without surrounding spaces, and GitLab recommends one for a distinct thought with spaces around it. Those differences show why teams should write their own rule clearly rather than present it as a general standard.
If a team chooses a ban, it should specify which character is prohibited and whether the en dash is covered too. A visual description alone can invite ambiguity: the hyphen, en dash, and em dash are different marks. A checker can enforce the precise character-level policy the team documents.
How to build a practical voice-check workflow
Use a published, versioned style guide as the source of truth, then separate rules a machine can verify from decisions that need a person. WordPress’s brand guide, for example, identifies itself as the source of truth for its agent-facing voice and points writers to a self-edit checklist. A similar division can keep the written policy and the actual checks aligned.
- Write the rule in observable terms. Name the exact punctuation, spelling, term, or structure that is required or forbidden, and state any exceptions.
- Keep the guide authoritative. Put the rule and its rationale in one maintained guide so writers know what the validator is enforcing.
- Automate binary checks. Run checks on drafts or in the content repository. A pre-commit hook can block a change before it is committed; a validator can report violations as part of review.
- Review exceptions deliberately. Document approved exceptions rather than quietly weakening a rule or allowing inconsistent workarounds.
- Use a human checklist for context. Ask whether the tone fits the reader and situation, whether the message is clear and considerate, and whether it sounds natural.
What automation does not prove
A passing validator means only that the checks it knows about passed. It does not establish that a piece is effective, that every writer interprets the brand consistently, or that readers respond better. The cited examples establish an enforcement pattern, not measured improvements in quality, consistency, or time saved. Treat any expected benefit as a reason to evaluate the workflow, not as a result already demonstrated by these examples.
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