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 HoangNguyen0403/agent-skills-standard --skill system-design-diagramminggit clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standardWrote 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/hoangnguyen0403/agent-skills-standard/system-design-diagramming)<a href="https://agentmods.dev/skills/hoangnguyen0403/agent-skills-standard/system-design-diagramming"><img src="https://agentmods.dev/badge/skills/hoangnguyen0403/agent-skills-standard/system-design-diagramming/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/hoangnguyen0403/agent-skills-standard/system-design-diagramming"><img src="https://agentmods.dev/badge/skills/hoangnguyen0403/agent-skills-standard/system-design-diagramming.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00063 | $0.00863 |
| Opus 5 | $0.00032 | $0.00432 |
| Sonnet 5 | $0.00013 | $0.00173 |
| Haiku 4.5 | $0.00006 | $0.00086 |
Grade A, and why
system-design-diagramming 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 13d 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 — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
System Diagramming (Archify Style)
Priority: P1 (HIGH)
Author a typed JSON spec, then render. Never hand-place pixels in prose, and never ship Mermaid as the deliverable.
Pick One Type
| Type | Use for |
|---|---|
architecture |
Components, services, cloud and trust boundaries |
workflow |
Processes, approval gates, runbooks, CI/CD |
sequence |
Call chains, request lifecycles, async traces |
dataflow |
Pipelines, ETL, lineage, consumers |
lifecycle |
State transitions, retries, terminal states |
One type per diagram. A design doc usually needs architecture plus one of sequence or dataflow.
Render Path
- Check whether the Archify skill is installed (
archify/SKILL.mdunder any agent skills directory). - Installed: author the JSON against its
schemas/<type>.schema.json, then runarchify validate <type> <file>.jsonafter every edit andarchify deliveronce at the end. A non-zero exit is never a success. - Not installed: emit inline SVG directly, following the style contract. Same tokens, same geometry, same legend rules.
- Either way the spec is the source of truth: nodes carry
id,type,label, optionalsublabelandtag; edges carryfrom,to,label,variant; groups list the ids theywrap.
Semantics Are Colors
- Node
typeis meaning, not decoration:frontend,backend,database,cloud,security,messagebus,external. - Edge
variantis meaning:defaultplain call,emphasismain request path,securityauth or policy hop,dashedasync or event. - Never introduce a color outside that map, and never inline a literal hex that breaks dark/light parity.
- Group frames come in two kinds only:
regionfor deployment or ownership,security-groupfor a trust boundary.
Composition Rules
- One left-to-right main path; side branches leave the nearest main-path node.
- At most 12 primary nodes. Split the view before crowding it.
- Number every lane or stage as
01 / Label, in order. - Every edge carries a label unless both endpoints already imply the protocol, direction, and sync behavior.
- Spacing means clear gap, not center distance: leave more than the label mask width plus 8px.
- Legend is mandatory and lists only the kinds actually present.
What ships with it
1 file 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.
- 13d ago First seen · 73 lines · 63 tokens per session scan A c5ab590434df
system-design-diagramming is a skill published in the GitHub repository HoangNguyen0403/agent-skills-standard (565 stars, last pushed 3d ago), licensed MIT. It adds 63 tokens to every session and 863 once invoked, about $0.0003 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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