Claude, Marketing Claims Review.

A natural guess is that once Claude has a skill called marketing-claims-review, it will read your ad copy and tell you whether it is legal. The video says no model hands down a legal verdict. What the skill does is check whether each claim is provable, and the output is a call about each claim, never a ruling.

It sorts, it never rules

The skill's job sounds like a ruling, but running it does not label anything legal or illegal. Every claim gets sorted into one of four outcomes: fine, needs proof, needs rewording, or cut. The skill never hands down the ruling itself, and the same categories are used on every run.

One worked claim

The video follows a single line of ad copy: "Trusted by 10,000 companies." It goes through two stages.

First the skill classifies the line. It is a specific factual claim, something measurable and something a reader could reasonably rely on.

Then it checks substantiation. The question is not whether some number exists on file, but whether 10,000 is the actual current count, as opposed to old lifetime sign-ups dressed up as trust.

A call, plus a suggested fix

The output is a call on each claim, together with a suggested fix that keeps the energy of the original copy. For the example, the skill does not say yes or no. It flags the line as needing substantiation and asks for the current count.

The attorney gate

Before any claim is marked as ready to ship, a user who is not a lawyer meets one more gate: has an attorney actually seen this? Whether the copy is good enough to ship is still a person's call, not the skill's.

Neither result proves much on its own

The video closes by cutting both ways. A flag does not mean a claim is false; the claim can be entirely true and still need the number on file. And a clean pass does not mean the claim is risk-free forever, because the product can change after the copy ships and nothing rechecks it on its own.

What the video does not claim

The "Trusted by 10,000 companies" line is a worked example. The video says nothing about whether it is true for any real product or anyone's real numbers.

Key takeaways

• Claude does not rule on whether an ad is legal; it checks whether each claim is provable.
• Each claim is sorted as fine, needs proof, needs rewording, or cut.
• The same categories are used on every run.
• A specific, measurable factual claim is classified first, then checked for substantiation.
• Substantiation means the number is the actual current count, not a stale lifetime total.
• Output includes a suggested fix that keeps the energy of the copy.
• A non-lawyer reaches an attorney gate before a claim counts as ready to ship.
• A flag does not mean false, and a clean pass does not mean safe forever.

Try it yourself

Paste this into Claude: "Here's a line from my landing page: 'Trusted by 10,000 companies, the fastest way to manage your projects.' Read the marketing-claims-review skill and walk me through what you will do before you do it. Then classify each claim, tell me which ones need substantiation, and suggest a fix that keeps the energy." Run it today against a line from your own marketing copy.