This is an example of an agent you can build with Sylvie: it reads any piece of copy before it ships and flags what a spell checker cannot see, from a broken sentence to a product name written the wrong way to a phrase this client has banned. It runs on your brand brain, so it proofs against your house style, your spelling conventions and your approved terminology instead of a generic dictionary. Sylvie does not ship it pre-built; your team assembles it on the brain that already knows how this brand writes.
Sylvie does not ship this agent pre-built. It is an example of an agent your team can build with Sylvie, powered by your brand brain, so it runs your workflow the way you actually run it.
The Grammar Checker agent is an example of what a marketing team or agency can build on Sylvie: a final proof pass that runs on everything before it leaves the building. It handles the ordinary layer (spelling, grammar, punctuation, agreement, consistency) and the layer no off-the-shelf tool can reach, like whether this brand writes its product as one word or two, whether this client spells in UK or US English, and whether the line you just wrote is on their do-not-say list.
The errors that actually cost you are rarely grammatical. They are the client's name misspelled in a subject line, a trademark used as a verb, a retired feature name in a live ad, a claim phrased the way legal already rejected once. An agent built on your brand brain catches those, because the rules live in the brain rather than in the head of the one person who happens to remember them.
Before it flags anything, the agent reads the brand brain: the style guide and spelling conventions, the product and feature names as they currently stand, the approved claims and the banned phrases, the legal wording that has to appear verbatim, and the work you have already published so it learns what correct looks like here. Because the brain is permission-aware, it proofs each asset against that account's rules only, so a UK client's conventions never get applied to a US client's copy.
Then it runs the pass end to end inside Sylvie: it returns the copy marked up, sorts every flag by type (hard error, style rule, terminology, risk) and attaches a suggested fix written in your voice, so correcting is a decision rather than a rewrite. You accept or override in the same place, and because it runs on the brain, the mistakes that keep recurring surface as a pattern you can brief writers on instead of correcting one asset at a time.
House spelling, capitalization and terminology get applied to every asset that passes through, so the guide stops being a PDF nobody opens and becomes the actual state of your output.
The pass happens before delivery, not after. The typo in the headline gets found by your agent rather than by the client's CEO on a Monday morning.
Each brand keeps its own spelling, naming and banned words, and the agent applies the right set to the right account. Nothing from one roster brand leaks into another's proof.
Product names, feature names and trademark usage are checked against the facts in your brain, so a rename actually finishes instead of surviving in copy for another six months.
Every flag arrives with a correction written the way your brand would write it, so a proof pass ends in clean copy rather than a list of problems for someone else to solve.
Recurring errors show up as patterns across the team, so you can brief writers on the five things they keep getting wrong instead of fixing the same slip forever.
A few of the jobs teams build this agent to handle, each one proofed against your brand brain rather than a generic dictionary. The outcome is always the same: nothing ships with an error your client would have noticed first.
Paid social copy is approved at six in the evening for a launch that runs overnight, with no editor left in the building. The agent proofs every variant against the client's style and terminology, so the campaign goes live clean instead of burning a typo into a static asset you cannot edit once it is served.
The agency writes for a London brand on Monday and a Chicago brand on Tuesday, and the conventions drift between them. The agent applies each account's rules automatically, so the marked-up PDF full of red circles stops arriving from the client side.
Twelve posts land from three freelancers on the same afternoon, all technically fine and all slightly inconsistent. The agent proofs the whole batch to one standard before the editor opens them, so the morning goes to argument and structure rather than comma placement.
A feature was renamed last quarter but the old name is still alive in emails, decks and two landing pages. The agent flags every instance against current product facts, so the rename finishes in a week instead of resurfacing at the next QBR.
A finance or health client has phrasing legal will not clear and disclaimers that must appear word for word. The agent checks both before delivery, so risky wording never reaches the review call and the compliance round shrinks to a formality.
A new business deck is being assembled the night before by four people in the same file. The agent proofs the whole thing in one pass, so you walk into the room with the prospect's company name spelled correctly on every single slide.
A spell checker knows English. It does not know that this client capitalizes their product a specific way, spells in UK English, and has three phrases their legal team struck out. You build this agent on your brand brain, so the rules it enforces are the ones written for this account, which is where the expensive mistakes actually live.
You build it. Sylvie does not ship a finished Grammar Checker; this page is an example of what a team assembles on the platform. Sylvie helps you wire it to your brand brain, your style rules and your terminology, so the proofreader you end up with checks for the things your best editor checks for.
It reads your style guide, spelling conventions, product and feature names, approved claims, banned phrases and required legal wording, then proofs against all of it at once. Because the brain is permission-aware, it only ever applies the rules belonging to the brand whose asset it is checking.
That is the case it is built for. Each brand brain carries its own conventions, so the agent proofs a client's copy by that client's standard with no cross-contamination between accounts. Onboarding a new brand means adding its rules to its brain, not rebuilding the agent.
You build it around the languages your team actually ships in, and it proofs each one against that market's conventions and the terminology your brain holds for it. A brand name or a legal phrase that must stay untranslated stays untranslated, because the brain says so.
No. It corrects errors and enforces the rules you defined, and everything else is presented as a flag you can wave off. Voice belongs to the brain, so the agent pulls copy toward your house standard rather than toward a neutral one.
Book a demo and we will map the workflows worth turning into agents, and show how each one runs on your brand brain.
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