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 agentmods add skills/genkovich/sdd/designnpx skills add genkovich/sdd --skill designgit clone --depth 1 https://github.com/genkovich/sddWrote 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/genkovich/sdd/design)<a href="https://agentmods.dev/skills/genkovich/sdd/design"><img src="https://agentmods.dev/badge/skills/genkovich/sdd/design.svg" alt="Measured on agentmods" 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 | $0.00221 | $0.04811 |
| Opus 5 | $0.00111 | $0.02405 |
| Sonnet 5 | $0.00044 | $0.00962 |
| Haiku 4.5 | $0.00022 | $0.00481 |
Grade A, and why
design 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 4d 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 — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: design
Generator of the Software Architecture Document (docs/features/<slug>/sad.md — Arc42 12 sections, C4 Context inline in §3 and C4 Container inline in §5) plus supporting ADRs (docs/features/<slug>/adr/NNNN-*.md). It drafts all 12 sections in memory, walks them Socratically one section at a time, spawns an ADR only when a decision's blast radius (масштаб удару — how painful it is to reverse the decision later) crosses the gate, writes each resolved section and its ADRs as one atomic commit (on route quick + depth easy, sections still hit the disk immediately but commits batch — step 6), and runs a clean-context critic over the finished SAD. The document itself is the state — resuming after an interrupt is free. L3 Component / L4 Code are out of scope. This file is the spine; detail lives in references/.
The Socratic machine, the critic, and the size matrix are shared — this skill keeps only its deltas:
→ ../_shared/socratic-loop.md · ../_shared/critic.md · ../_shared/size-matrix.md · ../_shared/ask-style.md
sad.md + ADR prose follow artifact_language — the Arc42 section headings, frontmatter, C4/Mermaid keywords and ADR Status values stay English → ../_shared/artifact-language.md.
Depth governs the per-section question volume + autonomy → ../_shared/interview-depth.md. C4 diagrams are confirmed in prose, never as raw source → ../_shared/diagram-presentation.md. design is also where the feature's target surface(s) are chosen — the first §4 decision, written to sad.md frontmatter target_surfaces and read (never re-derived) by every downstream stage → ../_shared/surfaces.md.
Owner
Architect / Tech Lead (drives everything). PM is consulted only on §10 Quality goals and §11 Risk severities.
What ships with it
9 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.
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.
- 4d ago First seen · 90 lines · 221 tokens per session scan A e1d5e72093d2
design is a skill published in the GitHub repository genkovich/sdd (118 stars, last pushed 15d ago), licensed MIT. It adds 221 tokens to every session and 4,811 once invoked, about $0.0011 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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