What is sk-design-diagram?

A diagram-making workflow that produces standalone HTML/SVG visuals and text-based flowcharts. It covers system structures, processes, data models, timelines, and other common diagram types.

Use it to create architecture diagrams, flowcharts, sequence diagrams, state machines, data-flow diagrams, entity-relationship diagrams, timelines, and related visuals.

It turns information that is hard to follow in prose or tables into a visual explanation. It can also redraw diagrams from draw.io or Mermaid and export them as PNG or SVG.

sk-design-diagram — Skill for Claude Code and OpenCode by MichelKerkme

Install

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.

Any agent

npx skills add MichelKerkmeester/skilled-agent-harness_spec-driven-loops --skill sk-design-diagram

Clone the repo

git clone --depth 1 https://github.com/MichelKerkmeester/skilled-agent-harness_spec-driven-loops

Made for: Claude Code, OpenCode.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-diagram/github.svg)](https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-diagram)

Your own site

<a href="https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-diagram"><img src="https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-diagram"><img src="https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-diagram.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 8,000 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

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 →

medium Excessive Agency · line 395
Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00025	$0.08000
Opus 5	$0.00013	$0.04000
Sonnet 5	$0.00005	$0.01600
Haiku 4.5	$0.00003	$0.00800

Measured today against content hash ef72b4ea3752, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

sk-design-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 today.

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.

.opencode/skills/sk-design/sk-design-diagram/SKILL.md · 399 lines

How it starts

The opening of the file, as written. The whole thing — 399 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Create Diagram

create-diagram is the sk-design hub's diagram mode for technical/product diagrams in two formats: html-svg (default) for 27 diagram types, and ascii-markdown for flowcharts embedded in markdown. HTML/SVG output uses one editorial design system, complexity budget, and taste gate. The packet also redraws draw.io / Mermaid sources and exports generated diagrams to PNG / SVG.

This packet owns both formats. type-flowchart.md remains the HTML/SVG TYPE reference; ascii-format/ and ascii-patterns/ are the separate ASCII FORMAT path.

1. WHEN TO USE

Activation Triggers

Use when a reader will learn more from a visual artifact than from prose, a table, or a bulleted list:

Components + connections in a system → architecture, IT current-state, high-level, data-platform diagrams.
Behavior and flow → flowchart, sequence, state machine, process, data flow, swimlane.
ASCII flowchart, workflow diagram, text diagram, decision tree, decision branch, approval loop, or parallel execution diagram in markdown.
Storage and data structure → ER / data model, medallion, DP integration, DP security matrix.
Structure, ranking, and time → timeline, Gantt, bar, line, scatter, radar, pyramid/funnel, venn, nested, tree, org chart, layer stack, quadrant, loop.
Redrawing an existing .drawio, .drawio.png, .drawio.svg, .mmd, .mermaid, or fenced-Mermaid source as a presentable editorial diagram.
Exporting a generated diagram as .png or .svg for a slide, social card, print, or further editing.
Repainting a diagram in a product's own visual language from a measured or hand-written DESIGN.md Style Reference.

Keyword triggers: create:diagram, /design:diagram, diagram, theme diagram, style reference, DESIGN.md, repaint diagram, brand the diagram, architecture diagram, sequence diagram, ER diagram, data model, swimlane, state machine, venn, org chart, draw.io, drawio, mermaid, redraw diagram, export diagram, ASCII flowchart, workflow diagram, text diagram, text characters, decision tree, decision branch, parallel execution diagram, approval loop diagram.

Read the full file on GitHub · 399 lines

Files

What ships with it

60 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.

Changes

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.

today Changed · -131 lines ef72b4ea3752
5d ago First seen · 530 lines · 25 tokens per session scan A 705eabf823fc

Subscribe to this mod's changes

sk-design-diagram is a skill published in the GitHub repository MichelKerkmeester/skilled-agent-harness_spec-driven-loops (35 stars, last pushed today), licensed MIT. It adds 25 tokens to every session and 8,000 once invoked, about $0.0001 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 2026-09-07.

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