data-dashboard: Design & UI for AI Agents | OpenAgentSkill

Overview

Build a dense, data-heavy screen - an analytics console or a trading terminal - with real charts drawn from tokens: candlestick, volume, depth, stacked area, waterfall, scatter, correlation matrix, donut, gauge, sparklines, heatmaps and order books. Use when the request is a dashboard, terminal, monitoring view, data console, or any screen whose job is to show many numbers at once. Covers the layout sequence, the SVG geometry, the accessibility contract per chart type, and the contrast traps that only appear in dark mode.

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Skill: Data dashboard

A dashboard is the hardest screen to keep honest: it is dense, it is mostly non-text, and almost every default makes it worse. This is the recipe that produced examples/showcase/ and examples/terminal/, both of which pass every gate in both themes.

1. Decide the brief before drawing anything

Answer these in one line each, or /grill-me them out of the user:

Who reads this, and what decision do they make from it? A revenue console for an operator and a trading desk for a dealer look nothing alike.
What is the one number that leads? A dashboard without a lead is a wall.
What is the update cadence? Hourly figures get a "last run" line. Live figures get a tape and a timestamp per row.
How dense is honest? A terminal earns 12 panels. A weekly report does not.

2. Layout sequence, not a grid of equal cards

Four equal stat cards is the single loudest tell that nobody designed this. Compose in bands, each a different shape:

Band	Content	Why
1	Hero metric at 3x body size + its own chart, spanning most of the width	The eye lands once
2	Two or three secondary figures, stacked or narrow	Quiet by construction
3	Three different chart shapes side by side (donut, ranked bars, sparklines)	Variety reads as intent
4	A table that really sorts, plus a feed or log	Detail after summary
5	A footer line that ends the page	A page must end on purpose

Use a 12-column grid with explicit spans (span 8 / span 4), collapsing to 6 then 1. Never repeat(auto-fit, …) for the primary bands - it produces exactly the equal-card wall you are avoiding.

3. The chart inventory

All of these are plain inline SVG with viewBox, sized by CSS, filled from --color-chart-*. No chart library, no runtime dependency.

Chart	Geometry	Use it for
Bar / column	`<rect>` per bucket, `rx` for a soft corner	Discrete periods
Candlestick	`<line>` wick + `<rect>` body per period, class by up/down	OHLC price
Volume	Bars under the price chart, same x-scale, `opacity:.45`	Conviction behind a move
Moving average	`<polyline>` over the candles, 2px, round joins	Trend through noise
Line / sparkline	`<polyline>`, `pathLength="1"` for a draw animation	Trend in a cell
Area / stacked area	`<path>` per band: forward along the top, reverse along the previous baseline, close	Composition over time
Depth	Two cumulative area paths mirrored around the mid	Book liquidity
Waterfall	Floating `<rect>` per step + dashed connectors between levels	Attribution
Donut	`<circle>` with `stroke-dasharray` and `rotate()` per segment	Share of a whole, 3-5 slices
Radial gauge	Same trick, `stroke-linecap:round`, 270-degree sweep	One value against a limit
Scatter / bubble	`<circle>`, radius = third dimension	Two measures plus weight
Correlation matrix	HTML table, cell tint via `color-mix`	Pairwise relationships
Heatmap	HTML table or `<rect>` grid, tint by value	Cohorts, calendars
Order book	HTML table with a depth bar per row	Bids and asks

Generate the geometry, do not hand-place it. Write a small deterministic script (a seeded walk) that emits the SVG elements, then paste the output in. Hand-typed coordinates drift and cannot be regenerated.

4. Domain correctness is part of craft

Gates cannot catch a chart that is drawn beautifully and means nothing. Check by hand:

A correlation matrix is symmetric and its diagonal is exactly 1. Random values in both triangles is an instant tell to anyone who reads one for a living.
A stacked area sums to the total; bands must not cross or leave gaps. The usual bug is reversing the baseline by index instead of by coordinate, which shows as dark wedges between bands.
A waterfall needs connectors, and the closing bar must equal opening plus the steps.
Depth rises away from the mid on both sides; it never falls.
A donut whose segments do not total the whole is a pie chart lying.

5. Accessibility contract, per chart

Every SVG gets role="img" plus either aria-label or <title>+<desc> referenced by aria-labelledby. Say what the chart shows, not that it is a chart: "Range 182.06 to 200.10, closing at 187.84" beats "price chart".
Never encode meaning in colour alone. Green with a + and an arrow; red with a -. Up and down also carry a word in the table cell.
Tables get <caption> (use .sr-only when the panel header already says it), scope="col" / scope="row", and aria-sort only if clicking really sorts.
Sortable headers, range tabs and theme toggles all declare state - so they must change it on a real click. verify_interactive.mjs clicks them and checks.

6. The traps that only appear when you measure

Every one of these was found on a screen that looked finished. The first group a gate caught; the ones marked "no gate sees it" were caught by opening the screenshot and looking, which is why that step is not optional:

A chart palette is not a text palette. White initials on --color-chart-4 measured 2.65:1 in dark. Chart colours are tuned for large filled shapes.
Success green as text on a raised surface measured 4.43:1 - four hundredths short of AA. Put the colour on the icon and the sign; keep the text neutral.
axe must not run mid-transition. Disable transitions before flipping the theme, or contrast is sampled while colours are still moving.
Dense tables do not fit a phone. Drop the column a phone can lose - the sparkline, the derived value - in a media query, and say so in a comment. Do not shrink type below the scale.
Stagger comes from a token: calc(var(--duration-fast) * 0.6 * n), never a typed millisecond.
A grid row stretches its items. Two fields side by side where only one has a hint: the hint-less control grows to match the taller column and the two inputs end up different heights. Set align-content: start on the field and an explicit block-size on the control. Measure the heights in the render - the difference is obvious in a screenshot and invisible in the markup.
The same stretch hits whole panels, and no gate sees it. A row is as tall as its tallest panel, and the short one packs its content to the top and ends in a bordered void - a heatmap panel with 130px of nothing under the caption, a right column that stops two panels short of the map beside it. Every panel in a row has to say which it is: one child absorbs the slack (grid-template-rows:auto minmax(0,1fr), and that child's own tracks go minmax(<min>,1fr) so its rows grow too), or the rows share it out (align-content:space-between), or the short column earns another panel. Screenshot the row and look at the bottom edge of each panel; this never shows up in the markup.
auto-fit silently drops a column, and no gate sees it. Three gauges in a panel about 340px wide with minmax(min(100%,7rem),1fr) resolved to two tracks and orphaned the third beside an empty cell. When the count is fixed and meaningful, write repeat(3,minmax(0,1fr)) and give narrow widths their own rule.
A category chart needs its categories on the page, and no gate sees it. A Pareto of five defect types whose names live only in the aria-label is a row of anonymous bars to everyone looking at it. Put the labels under the bars - lay the plot out on an even pitch inside its viewBox so a matching grid of labels lines up without a second coordinate system.
An needs a positioned ancestor. Inside a scroller it otherwise resolves against the initial containing block, lands outside the viewport, and inflates the document's scroll width by hundreds of pixels.

7. The loop

node scripts/measure_render.mjs <file> && node scripts/measure_render.mjs --dark <file>
node scripts/verify_states.mjs <file>  && node scripts/axe_audit.mjs --dark <file>
node scripts/verify_responsive.mjs <file> --scale=1.25
node scripts/verify_interactive.mjs <file>
node scripts/slop_tells.mjs --strict <file> && node scripts/taste_audit.mjs --strict <file>

Then screenshot it and look, in both themes, at 1600 and 390 wide. The gates will pass a chart that is drawn wrong. A correlation matrix that is not symmetric is 16/16 green and still embarrassing.

Worked references, both gate-verified: examples/showcase/index.html (revenue console) and examples/terminal/index.html (trading desk, ten chart types).

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File metadata

name: data-dashboard
description: Build a dense, data-heavy screen - an analytics console or a trading terminal - with real charts drawn from tokens: candlestick, volume, depth, stacked area, waterfall, scatter, correlation matrix, donut, gauge, sparklines, heatmaps and order books. Use when the request is a dashboard, terminal, monitoring view, data console, or any screen whose job is to show many numbers at once. Covers the layout sequence, the SVG geometry, the accessibility contract per chart type, and the contrast traps that only appear in dark mode.
invocation: model

View original text

---
name: data-dashboard
description: Build a dense, data-heavy screen - an analytics console or a trading terminal - with real charts drawn from tokens: candlestick, volume, depth, stacked area, waterfall, scatter, correlation matrix, donut, gauge, sparklines, heatmaps and order books. Use when the request is a dashboard, terminal, monitoring view, data console, or any screen whose job is to show many numbers at once. Covers the layout sequence, the SVG geometry, the accessibility contract per chart type, and the contrast traps that only appear in dark mode.
invocation: model
---

# Skill: Data dashboard

A dashboard is the hardest screen to keep honest: it is dense, it is mostly
non-text, and almost every default makes it worse. This is the recipe that
produced `examples/showcase/` and `examples/terminal/`, both of which pass every
gate in both themes.

## 1. Decide the brief before drawing anything

Answer these in one line each, or `/grill-me` them out of the user:

- **Who reads this, and what decision do they make from it?** A revenue console
  for an operator and a trading desk for a dealer look nothing alike.
- **What is the one number that leads?** A dashboard without a lead is a wall.
- **What is the update cadence?** Hourly figures get a "last run" line. Live
  figures get a tape and a timestamp per row.
- **How dense is honest?** A terminal earns 12 panels. A weekly report does not.

## 2. Layout sequence, not a grid of equal cards

Four equal stat cards is the single loudest tell that nobody designed this.
Compose in bands, each a different shape:

| Band | Content | Why |
|---|---|---|
| 1 | Hero metric at 3x body size + its own chart, spanning most of the width | The eye lands once |
| 2 | Two or three secondary figures, stacked or narrow | Quiet by construction |
| 3 | Three **different** chart shapes side by side (donut, ranked bars, sparklines) | Variety reads as intent |
| 4 | A table that really sorts, plus a feed or log | Detail after summary |
| 5 | A footer line that ends the page | A page must end on purpose |

Use a 12-column grid with explicit spans (`span 8` / `span 4`), collapsing to 6
then 1. Never `repeat(auto-fit, …)` for the primary bands - it produces exactly
the equal-card wall you are avoiding.

## 3. The chart inventory

All of these are plain inline SVG with `viewBox`, sized by CSS, filled from
`--color-chart-*`. No chart library, no runtime dependency.

| Chart | Geometry | Use it for |
|---|---|---|
| Bar / column | `<rect>` per bucket, `rx` for a soft corner | Discrete periods |
| Candlestick | `<line>` wick + `<rect>` body per period, class by up/down | OHLC price |
| Volume | Bars under the price chart, same x-scale, `opacity:.45` | Conviction behind a move |
| Moving average | `<polyline>` over the candles, 2px, round joins | Trend through noise |
| Line / sparkline | `<polyline>`, `pathLength="1"` for a draw animation | Trend in a cell |
| Area / stacked area | `<path>` per band: forward along the top, **reverse along the previous baseline**, close | Composition over time |
| Depth | Two cumulative area paths mirrored around the mid | Book liquidity |
| Waterfall | Floating `<rect>` per step + dashed connectors between levels | Attribution |
| Donut | `<circle>` with `stroke-dasharray` and `rotate()` per segment | Share of a whole, 3-5 slices |
| Radial gauge | Same trick, `stroke-linecap:round`, 270-degree sweep | One value against a limit |
| Scatter / bubble | `<circle>`, radius = third dimension | Two measures plus weight |
| Correlation matrix | HTML table, cell tint via `color-mix` | Pairwise relationships |
| Heatmap | HTML table or `<rect>` grid, tint by value | Cohorts, calendars |
| Order book | HTML table with a depth bar per row | Bids and asks |

**Generate the geometry, do not hand-place it.** Write a small deterministic
script (a seeded walk) that emits the SVG elements, then paste the output in.
Hand-typed coordinates drift and cannot be regenerated.

## 4. Domain correctness is part of craft

Gates cannot catch a chart that is drawn beautifully and means nothing. Check by
hand:

- A **correlation matrix is symmetric** and its diagonal is exactly 1. Random
  values in both triangles is an instant tell to anyone who reads one for a living.
- A **stacked area** sums to the total; bands must not cross or leave gaps. The
  usual bug is reversing the baseline by index instead of by coordinate, which
  shows as dark wedges between bands.
- A **waterfall** needs connectors, and the closing bar must equal opening plus
  the steps.
- **Depth** rises away from the mid on both sides; it never falls.
- A **donut** whose segments do not total the whole is a pie chart lying.

## 5. Accessibility contract, per chart

- Every SVG gets `role="img"` plus either `aria-label` or `<title>`+`<desc>`
  referenced by `aria-labelledby`. Say what the chart **shows**, not that it is a
  chart: "Range 182.06 to 200.10, closing at 187.84" beats "price chart".
- Never encode meaning in colour alone. Green with a `+` and an arrow; red with a
  `-`. Up and down also carry a word in the table cell.
- Tables get `<caption>` (use `.sr-only` when the panel header already says it),
  `scope="col"` / `scope="row"`, and `aria-sort` only if clicking really sorts.
- Sortable headers, range tabs and theme toggles all declare state - so they must
  change it on a real click. `verify_interactive.mjs` clicks them and checks.

## 6. The traps that only appear when you measure

Every one of these was found on a screen that looked finished. The first group a
gate caught; the ones marked "no gate sees it" were caught by opening the
screenshot and looking, which is why that step is not optional:

- **A chart palette is not a text palette.** White initials on `--color-chart-4`
  measured **2.65:1** in dark. Chart colours are tuned for large filled shapes.
- **Success green as text on a raised surface measured 4.43:1** - four
  hundredths short of AA. Put the colour on the icon and the sign; keep the text
  neutral.
- **axe must not run mid-transition.** Disable transitions before flipping the
  theme, or contrast is sampled while colours are still moving.
- **Dense tables do not fit a phone.** Drop the column a phone can lose - the
  sparkline, the derived value - in a media query, and say so in a comment. Do
  not shrink type below the scale.
- **Stagger comes from a token:** `calc(var(--duration-fast) * 0.6 * n)`, never a
  typed millisecond.
- **A grid row stretches its items.** Two fields side by side where only one has
  a hint: the hint-less control grows to match the taller column and the two
  inputs end up different heights. Set `align-content: start` on the field and an
  explicit `block-size` on the control. Measure the heights in the render - the
  difference is obvious in a screenshot and invisible in the markup.
- **The same stretch hits whole panels, and no gate sees it.** A row is as tall as
  its tallest panel, and the short one packs its content to the top and ends in a
  bordered void - a heatmap panel with 130px of nothing under the caption, a right
  column that stops two panels short of the map beside it. Every panel in a row
  has to say which it is: one child absorbs the slack
  (`grid-template-rows:auto minmax(0,1fr)`, and that child's own tracks go
  `minmax(<min>,1fr)` so its rows grow too), or the rows share it out
  (`align-content:space-between`), or the short column earns another panel.
  Screenshot the row and look at the bottom edge of each panel; this never shows
  up in the markup.
- **`auto-fit` silently drops a column, and no gate sees it.** Three gauges in a
  panel about 340px wide with `minmax(min(100%,7rem),1fr)` resolved to two tracks
  and orphaned the third beside an empty cell. When the count is fixed and
  meaningful, write `repeat(3,minmax(0,1fr))` and give narrow widths their own rule.
- **A category chart needs its categories on the page, and no gate sees it.** A
  Pareto of five defect types whose names live only in the `aria-label` is a row
  of anonymous bars to everyone looking at it. Put the labels under the bars -
  lay the plot out on an even pitch inside its viewBox so a matching grid of
  labels lines up without a second coordinate system.
- **An `.sr-only` needs a positioned ancestor.** Inside a scroller it otherwise
  resolves against the initial containing block, lands outside the viewport, and
  inflates the document's scroll width by hundreds of pixels.
- **A zero-area element that only has area while it animates** reads as content
  lost under `prefers-reduced-motion`. Give a radar sweep a wedge, not a 1px line.
- **Never reuse a class name across layout and colour.** `.c4` as both a
  four-column span and the fourth chart colour painted an entire panel pink.

## 7. The loop

```bash
node scripts/measure_render.mjs <file> && node scripts/measure_render.mjs --dark <file>
node scripts/verify_states.mjs <file>  && node scripts/axe_audit.mjs --dark <file>
node scripts/verify_responsive.mjs <file> --scale=1.25
node scripts/verify_interactive.mjs <file>
node scripts/slop_tells.mjs --strict <file> && node scripts/taste_audit.mjs --strict <file>
```

Then **screenshot it and look**, in both themes, at 1600 and 390 wide. The gates
will pass a chart that is drawn wrong. A correlation matrix that is not
symmetric is 16/16 green and still embarrassing.

Worked references, both gate-verified: `examples/showcase/index.html` (revenue
console) and `examples/terminal/index.html` (trading desk, ten chart types).

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License: MIT

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Source & usage notes

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Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: plugin87/ux-ui-agent-skills
License: MIT
Version: Unknown
Last GitHub push: Sep 15, 2026
Registry updated: Sep 15, 2026
Instruction path: .claude/skills/data-dashboard/SKILL.md @ a1bf92888754

Version reported in registry metadata; check source releases before relying on it.

Quality

73/100

Strong

Trust

69/100

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      "not_relevant": 0,
      "success_rate": null,
      "recent_success_rate": null,
      "recent_failure_rate": null,
      "install_attempts": 0,
      "install_success_rate": null,
      "risk_blocked": 0,
      "setup_required": 0,
      "avg_output_quality": null,
      "production_outcomes": 0,
      "last_outcome_at": null,
      "label": "No agent outcome data yet"
    },
    "auto_install": {
      "allowed": false,
      "sandbox_required": true,
      "reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
    },
    "best_for": [
      "design-creative",
      "agent-skill"
    ],
    "known_risks": [
      "AI review approval is missing",
      "Financial research output is not financial advice; require human review before any live investment decision.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Dependency/runtime risk: command execution surface, credential or environment access",
      "Permission surface: secrets or environment access, shell or command execution",
      "Review status: AI review approval is missing"
    ]
  },
  "agent_proven": {
    "version": "agent-proven-v1",
    "score": 0,
    "tier": "unproven",
    "label": "Needs first agent run",
    "summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
    "metrics": {
      "totalOutcomes": 0,
      "successfulOutcomes": 0,
      "failedOutcomes": 0,
      "installAttempts": 0,
      "installSuccessRate": null,
      "successRate": null,
      "recentSuccessRate": null,
      "recentFailureRate": null,
      "riskBlocked": 0,
      "setupRequired": 0,
      "notRelevant": 0,
      "avgOutputQuality": null,
      "avgTimeToUsefulMs": null,
      "productionOutcomes": 0,
      "humanReviewRequired": 0,
      "uniqueAgents": 0,
      "lastOutcomeAt": null
    },
    "signals": [],
    "penalties": [
      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 80,
    "risk_level": "needs_review",
    "risk_label": "Needs review",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "Financial research output is not financial advice; require human review before any live investment decision",
      "AI review approval is missing",
      "Financial research output is not financial advice; require human review before any live investment decision.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Dependency/runtime risk: command execution surface, credential or environment access"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 73,
    "label": "Strong"
  },
  "supply": {
    "track": "Design and creative production",
    "scenario": "Design and creative",
    "maintenance": "2d since push",
    "risk": "Needs review"
  },
  "alternative_skills": [
    {
      "slug": "emilkowalski-apple-design",
      "name": "Apple Design",
      "url": "https://www.openagentskill.com/skills/emilkowalski-apple-design",
      "stars": 34452,
      "install_command": "npx skills@latest add emilkowalski/skills",
      "trust_score": 94,
      "audit_score": 96
    }
  ],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "high-compliance environments without internal security review",
    "No OpenAgentSkill engagement data yet",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "Financial research output is not financial advice; require human review before any live investment decision",
    "AI review approval is missing"
  ],
  "agent_contract": {
    "task_input": "Use data-dashboard in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 77/100 Strong shortlist",
      "Audit: 80/100 Needs review",
      "Safety: 36/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "plugin87-data-dashboard (data-dashboard)",
      "install_command": "npx skills add plugin87/ux-ui-agent-skills --skill data-dashboard",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "plugin87-data-dashboard",
      "task": "Use data-dashboard in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/plugin87-data-dashboard",
    "api": "https://www.openagentskill.com/api/agent/skills/plugin87-data-dashboard",
    "audit": "https://www.openagentskill.com/skills/plugin87-data-dashboard/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=plugin87-data-dashboard&task=Use%20data-dashboard%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20data-dashboard%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20data-dashboard%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/plugin87-data-dashboard/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/plugin87-data-dashboard"
  }
}

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Creator: plugin87
Source: plugin87/ux-ui-agent-skills
Indexed by: OpenAgentSkill community index

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