Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add RedHatProductSecurity/prodsec-skills --skill crypto-protocol-diagramgit clone --depth 1 https://github.com/RedHatProductSecurity/prodsec-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/redhatproductsecurity/prodsec-skills/crypto-protocol-diagram)<a href="https://agentmods.dev/skills/redhatproductsecurity/prodsec-skills/crypto-protocol-diagram"><img src="https://agentmods.dev/badge/skills/redhatproductsecurity/prodsec-skills/crypto-protocol-diagram/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/redhatproductsecurity/prodsec-skills/crypto-protocol-diagram"><img src="https://agentmods.dev/badge/skills/redhatproductsecurity/prodsec-skills/crypto-protocol-diagram.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Prompt Injection · line 291 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00120 | $0.04682 |
| Opus 5 | $0.00060 | $0.02341 |
| Sonnet 5 | $0.00024 | $0.00936 |
| Haiku 4.5 | $0.00012 | $0.00468 |
Grade A, and why
crypto-protocol-diagram scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 435 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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.
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 |
|---|---|---|
| "The protocol is simple, I can diagram from memory" | Memory-based diagrams miss steps and invert arrows | Read the source or spec systematically |
| "I'll skip the spec path since code exists" | Code may diverge from the spec — both paths catch different bugs | When both exist, run spec workflow first, then annotate code divergences |
| "Crypto annotations are optional decoration" | Without crypto annotations, the diagram is just a message flow — useless for security review | Annotate every cryptographic operation |
| "The abort path is obvious, no need for alt blocks" | Implicit abort handling hides missing error checks | Show every abort/error path with alt blocks |
| "I don't need to check the examples first" | The examples define the expected output quality bar | Study the relevant example before working on unfamiliar input |
| "ProVerif/Tamarin models are code, not specs" | Formal models are specifications — they describe intended behavior, not implementation | Use the spec workflow (S1–S5) for .pv and .spthy files |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 435 lines · 120 tokens per session scan A f56238cb7f64
crypto-protocol-diagram is a skill published in the GitHub repository RedHatProductSecurity/prodsec-skills (52 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 120 tokens to every session and 4,682 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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