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 Tyler-R-Kendrick/agent-skills --skill hexagonalgit clone --depth 1 https://github.com/Tyler-R-Kendrick/agent-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/tyler-r-kendrick/agent-skills/hexagonal)<a href="https://agentmods.dev/skills/tyler-r-kendrick/agent-skills/hexagonal"><img src="https://agentmods.dev/badge/skills/tyler-r-kendrick/agent-skills/hexagonal/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/tyler-r-kendrick/agent-skills/hexagonal"><img src="https://agentmods.dev/badge/skills/tyler-r-kendrick/agent-skills/hexagonal.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00098 | $0.03291 |
| Opus 5 | $0.00049 | $0.01646 |
| Sonnet 5 | $0.00020 | $0.00658 |
| Haiku 4.5 | $0.00010 | $0.00329 |
Grade A, and why
hexagonal 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 9d 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 — 338 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Hexagonal Architecture (Ports and Adapters)
Overview
Hexagonal Architecture, introduced by Alistair Cockburn in 2005, organizes an application so that the core domain logic is isolated from external concerns (databases, APIs, UIs, message brokers) through ports (interfaces) and adapters (implementations). The goal is to make the application equally drivable by users, programs, automated tests, or batch scripts -- and equally connected to any external system.
The architecture is also known as Ports and Adapters. It shares the same fundamental principle as Onion Architecture (Jeffrey Palermo, 2008) and Clean Architecture (Robert C. Martin): dependencies point inward; the domain depends on nothing external.
The Hexagonal Diagram
Driving Side (Primary)
(things that USE the app)
REST CLI Tests Events
│ │ │ │
▼ ▼ ▼ ▼
┌─────────────────────────────────┐
│ Primary Adapters │
│ (implement driving ports) │
│ │
┌─────┤─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─┤─────┐
│ │ Primary Ports │ │
│ │ (interfaces the app exposes) │ │
│ │ │ │
│ │ ┌───────────────────┐ │ │
│ │ │ │ │ │
│ │ │ Domain Model │ │ │
│ │ │ (Pure Business │ │ │
│ │ │ Logic) │ │ │
│ │ │ │ │ │
│ │ └───────────────────┘ │ │
│ │ │ │
│ │ Secondary Ports │ │
│ │ (interfaces the app needs) │ │
└─────┤─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─┤─────┘
│ Secondary Adapters │
│ (implement driven ports) │
└─────────────────────────────────┘
│ │ │ │
▼ ▼ ▼ ▼
Postgres Redis Stripe Kafka
Driven Side (Secondary)
(things the app USES)
What ships with it
13 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- AGENTS.md 15 KB
- metadata.json 751 B
- README.md 654 B
- rules/_sections.md 1.7 KB
- rules/_template.md 368 B
- rules/hexagonal-combine-with-ddd-see.md 337 B
- rules/hexagonal-define-ports-using-domain-language-not-technology-language.md 436 B
- rules/hexagonal-keep-the-domain-model-completely-free-of-infrastructure.md 454 B
- rules/hexagonal-start-with-one-adapter-per-port.md 381 B
- rules/hexagonal-the-hexagonal-shape-is-a-metaphor-for-symmetry-there-is.md 441 B
- rules/hexagonal-use-dependency-injection-to-wire-adapters-to-ports-at-the.md 395 B
- rules/hexagonal-use-the-hexagonal-structure-to-enable-incremental-migration.md 416 B
- rules/hexagonal-write-the-majority-of-tests-against-ports-mock-adapters.md 427 B
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.
- 9d ago First seen · 338 lines · 98 tokens per session scan A 995e7890b32a
hexagonal is a skill published in the GitHub repository Tyler-R-Kendrick/agent-skills (11 stars, last pushed 3mo ago), licensed MIT. It adds 98 tokens to every session and 3,291 once invoked, about $0.0005 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 2026-08-31.
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