Two design skills · both proven

crypto-protocol-diagram vs prototype

Both skills were run through Claude twice: once on a fixed brief without the skill, once with it. The briefs differ because each is written for the job the skill claims to do, so compare each skill against its own baseline, then decide which difference matters for your work.

crypto-protocol-diagram

Extracts protocol message flow from source code, RFCs, academic papers, pseudocode, informal prose, ProVerif (.pv), or Tamarin (.spthy) models and generates Mermaid sequenceDiagrams with cryptographic annotations. Use when diagramming a crypto protocol, visualizing a handshake or key exchange flow, extracting message flow from a spec or RFC, diagramming a ProVerif or Tamarin model, or drawing…

Category: Design
Source: trailofbits/skills
License: Other
Proof model: claude-opus-5-5
Brief: “Draw the message flow of this login protocol as a single HTML page with an SVG sequence diagram, and note any weaknesses. 1. Client sends username to server. 2. Server replies with a random 16-byte nonce and the user's salt. 3. Client computes H = SHA-256(salt || password) and sends HMAC-SHA256(key=H, msg=nonce). 4. Server looks up stored H, computes the same HMAC and compares. 5. On success the server returns a session token valid for 30 days.”
Skill commit: 2be6433

Without the skillWith crypto-protocol-diagram

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Without, runWith crypto-protocol-diagram, run3 independent runs per side, none selected by hand.

Download the with-skill page

prototype

Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model or logic feels right, or explore what a UI should look like.

Category: Design
Source: mattpocock/skills
License: MIT
Proof model: claude-opus-5-5
Brief: “We are designing the order state model for a food delivery app. An order can be placed, accepted by the restaurant, being prepared, ready for pickup, picked up by a courier, and delivered. The customer can cancel until the restaurant starts preparing; the restaurant can cancel at any time before pickup; a cancellation after payment triggers a refund, partial if food was already prepared. We are not sure this logic is right. Build a throwaway prototype as a single HTML page that lets someone on the team drive an order through these states and see where the rules break or get confusing.”
Skill commit: 5beb35b

Without the skillWith prototype

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Without, runWith prototype, run3 independent runs per side, none selected by hand.

Download the with-skill page

We don’t pick a winner for you: the pages are the evidence. Both proofs can be repeated with the brief, model and commit shown above. See alternatives to crypto-protocol-diagram or alternatives to prototype.