Code Apps Design Guide Agent Skill

Design Guide Generator

$ARGUMENTS

Purpose

Create a comprehensive design guide tailored to the customer's brand, then hand off to the code-apps plugin (/create-code-app) to scaffold and build the app. This skill does NOT replicate scaffolding, deployment, or data source wiring — it focuses exclusively on brand extraction and design token generation, then delegates to the plugin for everything else.

Prerequisites

The code-apps plugin must be installed. If not already available, instruct the user:

/plugin marketplace add microsoft/power-platform-skills
/plugin install code-apps@power-platform-skills

Workflow

Step 0: Verify Plugin Installation

This step is only needed when the user wants to create a new app. If the user only wants the design guide and tokens for an existing project, skip to Step 1.

Run each substep in order:

0a. Run /plugin marketplace list. If microsoft/power-platform-skills is missing, ask: *"The Power Platform Skills marketplace isn't registered. Want me to add it?"* If yes, run /plugin marketplace add microsoft/power-platform-skills. If no, stop and offer to generate just the design guide without app creation.

0b. Run /plugin list. If code-apps is missing, ask: *"The code-apps plugin isn't installed. Want me to install it?"* If yes, run /plugin install code-apps@power-platform-skills. If no, stop and offer to generate just the design guide without app creation.

0c. Confirm /create-code-app resolves. If it does not, ask: *"The plugin seems broken. Want me to reinstall it?"* If yes, run /plugin uninstall code-apps then /plugin install code-apps@power-platform-skills.

After all substeps pass, proceed to Step 1.

Step 1: Gather Brand Inputs

Use the ask-questions tool to collect brand information from the customer:

• Brand name — What is the brand or product name?
• Brand assets — Ask the customer to provide one or more of the following:
• A link to an existing CSS stylesheet (e.g. a CDN-hosted brand stylesheet)
• A PDF or Word document containing brand guidelines
• A link to an existing website whose styling should be referenced
• A logo file or link to a logo
• Any specific colours, fonts, or design preferences described in text
• Platform targets — Is this for web, mobile, or both? Are there specific responsive breakpoints or information architecture patterns they need?

Step 2: Analyse Brand Assets

Based on what the customer provides:

If a CSS stylesheet link is provided:

• Fetch the stylesheet using the fetch_webpage tool
• Extract colour variables (custom properties, hex values, rgb/hsl values)
• Extract typography (font families, sizes, weights, line heights)
• Extract spacing scales, border radii, shadows
• Note any component-level patterns (buttons, cards, navigation)

If a PDF or document is provided:

• Read the document to extract:
• Colour palette — Primary, secondary, accent, neutral colours with exact values
• Typography — Font families, type scale, heading hierarchy, body text specs
• Logo usage — Clear space rules, minimum sizes, colour variants, placement guidelines
• Imagery & iconography — Style, tone, preferred icon sets
• Layout & grid — Column systems, margins, gutters, breakpoints
• Information architecture — Navigation patterns, page hierarchy, mobile vs desktop behaviour
• Tone & voice — If described, note for UI copy guidance

If a website link is provided:

• Fetch the page and inspect the rendered styles
• Extract the dominant colour palette
• Identify fonts in use
• Note layout patterns and component styles

Step 3: Generate the Design Guide

Produce a design-guide.md file in the working directory. Build it in four focused substeps:

3a. Colour Palette — Write the colour sections first:

# [Brand Name] Design Guide

## Colour Palette

### Primary Colours
| Name | Hex | RGB | Usage |
|------|-----|-----|-------|

### Secondary / Accent Colours
| Name | Hex | RGB | Usage |
|------|-----|-----|-------|

### Neutral / Greyscale
| Name | Hex | RGB | Usage |
|------|-----|-----|-------|

### Semantic Colours
| Name | Hex | Usage |
|------|-----|-------|
| Success | ... | Positive actions, confirmations |
| Warning | ... | Caution states |
| Error | ... | Destructive actions, errors |
| Info | ... | Informational notices |

3b. Typography & Logo — Append the type and logo sections:

## Typography

### Font Families
- **Headings:** [Font name] — [source/link]
- **Body:** [Font name] — [source/link]
- **Monospace:** [Font name] — [source/link]

### Type Scale
| Level | Size | Weight | Line Height | Usage |
|-------|------|--------|-------------|-------|
| H1 | ... | ... | ... | Page titles |
| H2 | ... | ... | ... | Section headings |
| H3 | ... | ... | ... | Subsection headings |
| Body | ... | ... | ... | Default text |
| Small | ... | ... | ... | Captions, labels |

## Logo Usage
- Minimum clear space: [value]
- Minimum size: [value]
- Colour variants: Full colour / Monochrome / Reversed
- Placement: [guidelines]

3c. Spacing, Layout & Breakpoints — Append the layout sections:

## Spacing & Layout

### Spacing Scale
| Token | Value | Usage |
|-------|-------|-------|

### Grid System
- Columns: [count]
- Gutter: [value]
- Max content width: [value]

### Breakpoints
| Name | Min Width | Behaviour |
|------|-----------|-----------|
| Mobile | 0 | Single column, stacked navigation |
| Tablet | ... | ... |
| Desktop | ... | ... |
| Wide | ... | ... |

3d. Components & Information Architecture — Append the component and IA sections:

## Components

### Buttons
- Border radius, padding, states (default, hover, active, disabled, focus)

### Cards
- Border radius, shadow, padding

### Navigation
- Pattern: [top bar / sidebar / bottom tabs / hamburger]
- Mobile behaviour: [description]

## Information Architecture
- Navigation depth: [flat / 2 levels / deep hierarchy]
- Mobile navigation: [bottom tabs / hamburger / drawer]
- Key page templates: [list]

Step 4: Generate Design Tokens File

Create a design-tokens.css file with CSS custom properties extracted from the brand analysis:

:root {
  /* Colours */
  --color-primary: ...;
  --color-primary-light: ...;
  --color-primary-dark: ...;
  --color-secondary: ...;
  --color-accent: ...;
  --color-background: ...;
  --color-surface: ...;
  --color-text: ...;
  --color-text-muted: ...;
  --color-success: ...;
  --color-warning: ...;
  --color-error: ...;
  --color-info: ...;

  /* Typography */
  --font-heading: ...;
  --font-body: ...;
  --font-mono: ...;
  --text-xs: ...;
  --text-sm: ...;
  --text-base: ...;
  --text-lg: ...;
  --text-xl: ...;
  --text-2xl: ...;
  --text-3xl: ...;

  /* Spacing */
  --space-xs: ...;
  --space-sm: ...;
  --space-md: ...;
  --space-lg: ...;
  --space-xl: ...;
  --space-2xl: ...;

  /* Radii */
  --radius-sm: ...;
  --radius-md: ...;
  --radius-lg: ...;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: ...;
  --shadow-md: ...;
  --shadow-lg: ...;
}

Step 5: Confirm with the Customer

Present the design guide summary and ask:

• Does the colour palette look correct?
• Are the fonts right?
• Any adjustments to spacing, sizing, or component styles?
• Should any sections be expanded or removed?

Iterate until the customer is satisfied with the design tokens.

Step 6: Delegate to the Code Apps Plugin

Once the design guide is finalised, invoke the code-apps plugin to scaffold and build the app:

• Invoke /create-code-app — Let the plugin handle:
• Prerequisites check (Node.js, Git)
• Requirements gathering (what the app does, data sources)
• Scaffolding via npx degit
• npx power-apps init
• Baseline build & deploy
• Data source wiring (/add-dataverse, /add-sharepoint, etc.)

• Pass brand context — When /create-code-app reaches its "Implement App" step (Step 8), provide:
• The design-tokens.css file to import into the app's src/ directory
• The design guide as reference for component styling decisions
• Theme preference derived from the brand (light/dark/auto)
• Any information architecture requirements (nav patterns, breakpoints, mobile behaviour)

Step 7: Apply Brand Styling Post-Scaffold

After the plugin scaffolds the app, apply the brand layer:

• Copy design-guide.md into the project root so it lives alongside the code
• Copy design-tokens.css into src/styles/design-tokens.css
• Import tokens in the app's main CSS/entry point:

   @import './styles/design-tokens.css';

• Update index.html — Add any external font links (Google Fonts, Adobe Fonts, etc.)
• Override template defaults — Replace the generic theme in src/App.css or equivalent with brand colours, typography, and spacing from the tokens
• Apply component patterns — If the design guide specifies button styles, card styles, or navigation patterns, update the template's base components accordingly
• Create .github/copilot-instructions.md (or append to it if it exists) with the following content so that all future Copilot interactions reference the design guide:

   ## Design Guide

   This project has a brand design guide at `design-guide.md` in the project root.

   When creating or modifying UI components, always:
   - Refer to `design-guide.md` for colour palette, typography, spacing, component patterns, and information architecture rules
   - Use the CSS custom properties defined in `src/styles/design-tokens.css` — never hardcode colour values, font stacks, or spacing
   - Follow the breakpoints and responsive behaviour described in the design guide
   - Respect logo usage rules (clear space, minimum size, colour variants)
   - Match the navigation pattern and information architecture specified in the guide
   - Maintain WCAG accessibility contrast ratios documented in the colour palette

Step 8: Verify Build

Run npm run build to confirm the brand styling doesn't break the app. Fix any issues.

Then let the code-apps plugin continue with its normal deployment flow (npx power-apps push).

Integration Notes

• This skill is a pre-step to /create-code-app — it runs first, then delegates
• The design-guide.md file MUST live in the project root and be referenced by .github/copilot-instructions.md so that all future Copilot sessions (new features, refactors, component additions) automatically consult the brand guide
• The design tokens file (src/styles/design-tokens.css) is the runtime contract — components use these variables, never raw values
• Do NOT duplicate what the code-apps plugin already does (scaffolding, init, deploy, data sources)
• If the user already has a scaffolded app, skip Step 6 and go straight to Step 7 (apply tokens to existing project)
• The code-apps plugin handles all Power Platform concerns (connectors, generated services, npx power-apps CLI)
• If the user updates their brand guidelines later, re-run Steps 2–5 to regenerate tokens, then update the files in the project — the copilot-instructions reference ensures future work stays aligned

Notes

• Always prefer exact colour values from brand documents over approximations
• If the brand document specifies accessibility requirements (WCAG levels), include contrast ratios in the colour table
• If no brand assets are provided, ask the customer to describe their brand in terms of adjectives (modern, playful, corporate, minimal, etc.) and generate a suggested palette
• Keep the design guide as a living document — it can be updated as the project evolves
• The design tokens should use CSS custom properties so they work regardless of the CSS framework the app uses