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 MichelKerkmeester/skilled-agent-harness_spec-driven-loops --skill diagram-designgit clone --depth 1 https://github.com/MichelKerkmeester/skilled-agent-harness_spec-driven-loopsWrote 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/michelkerkmeester/skilled-agent-harness_spec-driven-loops/diagram-design)<a href="https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/diagram-design"><img src="https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/diagram-design/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/michelkerkmeester/skilled-agent-harness_spec-driven-loops/diagram-design"><img src="https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/diagram-design.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 | $0.00223 | $0.08637 |
| Opus 5 | $0.00112 | $0.04319 |
| Sonnet 5 | $0.00045 | $0.01727 |
| Haiku 4.5 | $0.00022 | $0.00864 |
Grade A, and why
diagram-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 7d 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 — 540 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Diagram Design
Create visual diagrams as self-contained HTML files with inline SVG and CSS, following an opinionated editorial design system.
Twenty-seven diagram types. One shared design system, complexity budget, and taste gate. Type-specific conventions live in references/ and are loaded only when you pick a type.
0. First-time setup — style guide gate
Before generating your first diagram in a new project, verify the style guide has been customized.
Open references/style-guide.md and check the default tokens. If they're still the shipped defaults (paper #faf7f2, ink #1c1917, accent #b5523a rust), pause and ask the user:
"This is your first Schematic in this project. The style guide is still at the default (neutral stone + rust). Do you want to customize it to match your brand first? Options: (a) pull from your website URL, (b) extract from an installed skill, (c) extract from a local folder / design-system directory, (d) paste tokens manually, (e) proceed with the default for now."
Then branch:
- (a) → follow
references/onboarding.md § URLto fetch the site, extract palette + fonts, propose a diff, and writestyle-guide.md. - (b) → follow
references/onboarding.md § Skill— ask which skill, read its SKILL.md / CSS / token files, map to semantic roles, propose diff. - (c) → follow
references/onboarding.md § Folder— ask for the path, glob for CSS/JSON/MD token files, map to semantic roles, propose diff. - (d) → accept the user's tokens and write them into
style-guide.mdunder a new "Custom tokens" section. - (e) → proceed; optionally remind the user they can run onboarding later.
Once the style guide has been customized (or the user explicitly opted for default), skip this gate on subsequent runs. A simple way to detect customization: if the accent value in style-guide.md differs from #b5523a, assume custom.
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.
- assets/example-architecture-dark.html 12 KB
- assets/example-architecture-full.html 15 KB
- assets/example-architecture.html 12 KB
- assets/example-bar-dark.html 8.9 KB
- assets/example-bar-full.html 11 KB
- assets/example-bar.html 8.7 KB
- assets/example-data-flow-dark.html 13 KB
- assets/example-data-flow-full.html 15 KB
- assets/example-data-flow.html 13 KB
- assets/example-datalake-dark.html 25 KB
- assets/example-datalake-full.html 28 KB
- assets/example-datalake.html 26 KB
- assets/example-dp-integration-dark.html 14 KB
- assets/example-dp-integration-full.html 17 KB
- assets/example-dp-integration.html 14 KB
- assets/example-dp-security-matrix-dark.html 10 KB
- assets/example-dp-security-matrix-full.html 12 KB
- assets/example-dp-security-matrix.html 11 KB
- assets/example-er-dark.html 14 KB
- assets/example-er-full.html 17 KB
- assets/example-er.html 14 KB
- assets/example-flowchart-dark.html 9.0 KB
- assets/example-flowchart-full.html 12 KB
- assets/example-flowchart.html 9.0 KB
- assets/example-gantt-dark.html 10 KB
- assets/example-gantt-full.html 12 KB
- assets/example-gantt.html 9.8 KB
- assets/example-high-level-dark.html 24 KB
- assets/example-high-level-full.html 28 KB
- assets/example-high-level-vertical-dark.html 24 KB
- assets/example-high-level-vertical-full.html 28 KB
- assets/example-high-level-vertical.html 30 KB
- assets/example-high-level.html 26 KB
- assets/example-import-drawio.html 12 KB
- assets/example-import-mermaid.html 7.9 KB
- assets/example-it-state-dark.html 12 KB
- assets/example-it-state-full.html 14 KB
- assets/example-it-state.html 12 KB
- assets/example-layers-dark.html 6.8 KB
- assets/example-layers-full.html 9.8 KB
- assets/example-layers.html 6.7 KB
- assets/example-line-dark.html 7.4 KB
- assets/example-line-full.html 9.8 KB
- assets/example-line.html 7.3 KB
- assets/example-loop-dark.html 6.7 KB
- assets/example-loop-full.html 9.7 KB
- assets/example-loop-terminal.html 9.8 KB
- assets/example-loop.html 6.6 KB
- assets/example-medallion-dark.html 13 KB
- assets/example-medallion-full.html 16 KB
- assets/example-medallion.html 13 KB
- assets/example-nested-dark.html 6.6 KB
- assets/example-nested-full.html 9.6 KB
- assets/example-nested.html 6.7 KB
- assets/example-org-chart-dark.html 11 KB
- assets/example-org-chart-full.html 12 KB
- assets/example-org-chart.html 11 KB
- assets/example-process-dark.html 15 KB
- assets/example-process-full.html 17 KB
- assets/example-process.html 15 KB
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.
- 7d ago Changed · +1 lines be10184d3bfb
- 9d ago First seen · 539 lines · 223 tokens per session scan A 5decdfe9fa67
diagram-design is a skill published in the GitHub repository MichelKerkmeester/skilled-agent-harness_spec-driven-loops (35 stars, last pushed today), licensed MIT. It adds 223 tokens to every session and 8,637 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 2026-09-03.
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