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sk-design-chart

sk-design-chart is a skill for Claude Code, OpenCode from MichelKerkmeester/skilled-agent-harness_spec-driven-loops. It costs 31 tokens per session (2,667 once invoked), scanned C, original, MIT.

A chart-authoring workflow that turns data comparisons into standalone HTML charts. It helps choose chart forms such as rankings, part-to-whole charts, time series, distributions, relationships, and matrices.

In plain words
What is it for?
Use it to plot data, choose or apply a chart form, build a standalone HTML chart, or add and check chart types in the chart collection.
Why use it?
It provides a defined way to match a chart type to the comparison readers need to make. It also keeps chart colours and chart examples consistent.

Skill for Claude CodeOpenCode

Written for Claude Code and OpenCode: allowed-tools in frontmatter, but also installed under .opencode/.

not rated 35repo +1 changed today C scan 31 tokens original MIT

Good fit Use it to plot data, choose or apply a chart form, build a standalone HTML chart, or add and check chart types in the chart collection.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-chart
View source ↗ MichelKerkmeester/skilled-agent-harness_spec-driven-loops
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-chart
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.

agentmods badge for sk-design-chart

README.md
[![agentmods](https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-chart/github.svg)](https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-chart)
Your own site
<a href="https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-chart"><img src="https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-chart/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.

agentmods 80×15 button for sk-design-chart

Your own site · 80×15
<a href="https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-chart"><img src="https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/sk-design-chart.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,667 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00031 $0.02667
Opus 5 $0.00015 $0.01333
Sonnet 5 $0.00006 $0.00533
Haiku 4.5 $0.00003 $0.00267

Measured today against content hash 386d109ae352, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade C, and why

sk-design-chart scanned grade C with 1 finding 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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- Keywords: create-chart, chart, data visualization, plot the data, treemap, waterfall chart, heatmap, box plot, histogram, chart catalog, colour system, standalone html chart -->
.opencode/skills/sk-design/sk-design-chart/SKILL.md · 203 lines

How it starts

The opening of the file, as written. The whole thing — 203 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Create Chart

sk-design-chart is the chart-authoring workflow packet of the sk-design parent hub. It produces a standalone HTML chart from a corpus of chart forms that lives inside this packet.

1. WHEN TO USE

Activation Triggers

Use this packet when the request involves:

  • Building a chart that plots data: a ranked comparison, a part-to-whole split, a time series, a distribution, a relationship or a matrix.
  • Deciding which chart form answers the comparison a reader needs to make.
  • Choosing or applying one of the packet's three stock colour systems, or a provenance-gated design-md delivery.
  • Applying a local v3 DESIGN.md Style Reference to a chart delivery.
  • Adding a chart form to the corpus, or checking that the corpus still renders.

Keyword triggers: create a chart, plot the data, data visualization, treemap, waterfall chart, heatmap, box plot, histogram, chart catalog, chart colour system, standalone html chart, DESIGN.md, style reference, measured site's look, theme a chart.

When NOT to Use

Use another sk-doc packet when:

  • The artifact explains a structure rather than plotting values. A flow, an architecture, a sequence or a state machine is sk-design-diagram work.
  • The request is about the prose around a chart rather than the chart. That is sk-create-readme or sk-create-quality-control.
  • The request asks to extract interface design values from a site. Extraction belongs to sk-design-md-generator; applying an already extracted local DESIGN.md stays here.

The boundary against sk-design-diagram is the one that actually gets tested, because that packet already names bar, line, scatter and radar in its own selection guide. The split is what the artifact carries. A diagram carries a structure a reader follows. A chart carries values a reader compares.

Read the full file on GitHub · 203 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.

  1. today Changed · -1 lines 386d109ae352
  2. 2d ago Changed · +1 lines d1f68e299ca6
  3. 3d ago Changed · +12 lines cd1b562644f8
  4. 5d ago First seen · 191 lines · 31 tokens per session scan C 7d2fb9bd37ce

Subscribe to this mod's changes

sk-design-chart is a skill published in the GitHub repository MichelKerkmeester/skilled-agent-harness_spec-driven-loops (35 stars, last pushed today), licensed MIT. It adds 31 tokens to every session and 2,667 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-07.

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