Canvas Apps Tools

Generate paste-ready Power Apps Canvas App YAML from screenshots, mockups, or text — directly inside Claude Code.

What it does

This plugin gives Claude Code a single skill — canvas-apps-ui-gen — that acts as a Power Apps Canvas App developer. Point it at a mockup, describe a screen, or paste a screenshot of an existing app and it produces YAML you can paste straight into Power Apps Studio.

• Replicate a UI mockup or wireframe as Canvas App YAML
• Improve an existing Canvas App screen (modernize spacing, upgrade controls, add hover/focus states)
• Build from scratch from a text description alone
• Enforces Power Apps YAML rules (PA2105 / PA2108 / PA1001) automatically
• Saves output to canvas-apps-ui-gen-output/ in your current working directory and displays it inline when small (< 400 lines)

Requirements

• Claude Code or GitHub Copilot CLI
• Node.js 18+
• Power Apps Studio (to paste and run the generated YAML)

Installation

Choose whichever method fits your workflow. Both end with the same command: /canvas-apps-ui-gen.

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Method 1 — Marketplace (recommended)

Run these commands inside Claude Code:

Add this repo as a marketplace, then install the plugin:

/plugin marketplace add ToluVictor/canvas-apps-tools

Then install the plugin:

/plugin install canvas-apps-ui-gen@ToluVictor/canvas-apps-tools

Open a new Claude Code instance to activate the plugin, then run the skill:

/canvas-apps-ui-gen

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Method 2 — Individual skill install (skills CLI)

If you only want this one skill without installing the full plugin, run this in your terminal:

npx skills add ToluVictor/canvas-apps-tools --skill canvas-apps-ui-gen

Then run the skill inside Claude Code:

/canvas-apps-ui-gen

This uses the skills.sh Agent Skills CLI. The skill is installed into your Claude Code skills folder and is available immediately in any new session.

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Usage

Once installed, run /canvas-apps-ui-gen and Claude will ask which mode you want:

From a screenshot or mockup

Pass a file path as an argument:

/canvas-apps-ui-gen C:\path\to\mockup.png

Or paste the image directly into the chat and run /canvas-apps-ui-gen — Claude detects it automatically.

From a text description

Run /canvas-apps-ui-gen with no arguments, choose Build from scratch, and describe what you want:

"Sales order entry with a search bar, a data grid, and a totals row at the bottom"

Improve an existing screen

Paste a screenshot of your current Power Apps screen into the chat, run /canvas-apps-ui-gen, and choose Improvement. Describe the changes you want and Claude will modernize the layout, controls, and styling.

Paste into Power Apps Studio

When generation finishes, Claude shows a link to the output file and paste instructions. The general flow is:

1. Open the generated YAML file in canvas-apps-ui-gen-output/ in your current working directory
2. Press Ctrl+A then Ctrl+C to copy everything
3. In Power Apps Studio, right-click the target screen or container in the tree view
4. Select Paste code
5. Validate and adjust as needed

How it works

The skill runs a multi-agent pipeline internally:

1. Detects input mode and parses the image or text
2. Describes the layout and asks a few quick questions before generating
3. Runs three specialist agents in parallel — layout & sizing, controls, and styling
4. An assembly agent merges their outputs, runs QA checks, and writes the final YAML

Troubleshooting

Symptom	Fix
/canvas-apps-ui-gen not recognized	Open a new Claude Code instance; verify the install with /plugin → Installed tab
No output file appears	Check canvas-apps-ui-gen-output/ in your current working directory; rerun with a clearer description or smaller scope
YAML shows errors in Power Apps Studio	Copy from the file directly (do not retype); if errors persist, rerun with a simpler prompt and fewer nested controls
PA2105 version warning	Claude will self-heal the version number if you mention the warning in the same session
"The function * returned a non-finite number." error banner appears after pasting YAML	This occurs when the app contains a Gallery whose Items property could not be evaluated at paste time. Save the page, then reload Canvas App Studio — the error will clear on reload.

Contributing

• Fork this repo
• Add or update content under skills/canvas-apps-ui-gen/
• Submit a pull request

License

MIT — see LICENSE

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By Tolu Victor Sanwoolu