Prove you built it first.
Cryptographic proof of authorship for your Agent Skill (.mdc). We compute a SHA-256 hash in your browser, timestamp it, and issue a permanent certificate with a QR code.
We also run semantic near-duplicate detection to protect you against similar skills.
No accounts. No subscriptions. One-time payment of $39.
Why developers register their skills
Three reasons — proof, portability, and protection.
You were first.
Verifiable proof you built this Claude Agent Skill on this exact date. If someone later claims authorship, you hold the SHA-256 timestamp and the cryptographic evidence.
QR code on every certificate.
Every certificate carries a QR code linking to its public verification page. Drop it in your GitHub README, docs, or LinkedIn — one scan and anyone can confirm authorship of your Agent Skill.
Near-duplicate protection.
Every paid registration is automatically scanned against the existing Claude Agent Skills Registry. If a later submission is semantically similar to yours, you receive an email with the new registrant's name and contact.
How it works
Four steps. No accounts. No recurring fees.
- 1Step 1
Drop your .mdc or SKILL.md file
We compute the SHA-256 hash in your browser. Only the hash is sent for the initial duplicate check against the Claude Agent Skills Registry — the file itself is uploaded with your form submission. - 2Step 2
Exact duplicate check
We check if this exact file has already been registered. You'll see a clear warning if it has, but you can still proceed. - 3Step 3
Pay $39 one-time
Complete the secure payment via Stripe. - 4Step 4
Receive your certificate
You immediately get a clean PDF with a QR code and a permanent verification link.
We also run a semantic similarity check against the Claude Agent Skills Registry in the background. You'll receive an email if strong matches are found.
How SkillAuthor works · Guides · Verify a skill · Technical overview →
Ready to register?
No account required. No subscription. Permanent record.