create-canvas-app SKILL.md skillA
create-canvas-app from jongio/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jongio/skills/create-canvas-app@v1.1.0Pins v1.1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jongio/skills
- Path
skills/create-canvas-app/SKILL.md- Versions recorded
- 8
- Latest version
- v1.1.0, committed Oct 30, 2026
- First version recorded
- Jul 16, 2026
- Size
- 23,593 bytes
- Repository stars
- 18
- License
- MIT
Build a GitHub Copilot App canvas extension the right way, fast. Use when the user wants to create, scaffold, or improve an interactive canvas (a side-panel UI the agent can open and drive) — dashboards, editors, trackers, boards, document/preview surfaces. Provides a no-build Preact + htm kit with live SSE state, durable per-user storage, Primer theming, and the official GitHub Lucide icon set, plus a generator that stamps a working canvas in one command. Do NOT use for non-canvas extensions…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Create Canvas App ## What a canvas is (and when to build one) A canvas is an interactive surface the agent opens in a side panel via `open_canvas`. Both the **agent** and the **user** act on the **same state** through the **same action handlers**. Reach for a canvas when chat text or a diff isn't enough: live dashboards, editors, spreadsheets, trackers, kanban/board views, document previews, tool-specific workflows. If the user just needs a non-visual agent tool, build a normal extension tool instead — not a canvas. ## Rendering tier — decide first | Tier | Use when | How | | --- | --- | --- | | **Static HTML string** | Read-only or near-static content; no inputs to protect | The runtime's vanilla scaffold (`extensions_manage scaffold kind:canvas`). | | **Preact + htm + this kit** | Anything interactive: inputs, live updates, lists, forms, shared state | This kit. **Default choice for real canvases.** | For the static tier, use the vanilla scaffold as generated and keep the HTML in its single extension module. Do not copy `canvas-kit/` into that extension. Move to a generated Preact template as soon as the canvas needs inputs, shared state, …
Read the whole file at its exact version.
How to install
mdr add jongio/skills/create-canvas-app@sha256:ee8efdd418c18455The line at the top of this page pins the label v1.1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_vgrdw5dxsjwgnjfv)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 8 versions of this file, between Jul 16, 2026 and Oct 30, 2026, about one every 15 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.1.0 latest | 2026-10-30 | 9dc814e | 23,593 B | A | view · diff |
| v1.0.0 | 2026-10-22 | 48a4819 | 23,201 B | A | view · diff |
| v1.0.0 | 2026-10-22 | 5c610e8 | 24,223 B | A | view · diff |
| git:20261003.75f579a | 2026-10-03 | 75f579a | 24,194 B | A | view · diff |
| git:20260823.855bf8d | 2026-08-23 | 855bf8d | 23,476 B | A | view · diff |
| git:20260723.4b37d29 | 2026-07-23 | 4b37d29 | 23,464 B | A | view · diff |
| git:20260720.bbd0bbc | 2026-07-20 | bbd0bbc | 37,558 B | A | view · diff |
| git:20260716.44e156f | 2026-07-16 | 44e156f | 37,441 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (23593 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
jongio/skills · 18 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_vgrdw5dxsjwgnjfv GET https://markdownregistry.com/api/v1/resolve?ref=jongio/skills/create-canvas-app GET https://markdownregistry.com/api/v1/blob/ee8efdd418c184558787f210b8bc170527849efafb86a80fc61a9a639132146e
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.