crypto-protocol-diagram

# Crypto Protocol Diagram Produces a Mermaid `sequenceDiagram` (written to file) and an ASCII sequence diagram (printed inline) from either: - **Source code** implementing a cryptographic protocol, or - **A specification** — RFC, academic paper, pseudocode, informal prose, ProVerif (`.pv`), or Tamarin (`.spthy`) model. **Tools used:** Read, Write, Grep, Glob, Bash, WebFetch (for URL specs). Unlike the `diagramming-code` skill (which visualizes code structure), this skill extracts **protocol semantics**: who sends what to whom, what cryptographic transformations occur at each step, and what protocol phases exist. For call graphs, class hierarchies, or module dependency maps, use the `diagramming-code` skill instead. ## When to Use - User asks to diagram, visualize, or extract a cryptographic protocol - Input is source code implementing a handshake, key exchange, or multi-party protocol - Input is an RFC, academic paper, pseudocode, or formal model (ProVerif/Tamarin) - User names a specific protocol (TLS, Noise, Signal, X3DH, FROST) ## When NOT to Use - User wants a call graph, class hierarchy, or module dependency map — use `diagramming-code` - User wants to formally verify a protocol — use `mermaid-to-proverif` (after generating the diagram) - Input has no cryptographic protocol semantics (no parties, no message exchange) ## Rationalizations to Reject | Rationalization | Why It's Wrong | Required Action | |-----------------|----------------|-----------------| | "...