json-canvas SKILL.md skillA
json-canvas from yeaight7/agent-powerups is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add yeaight7/agent-powerups/json-canvas@git:20260430.38ab2a1Pins git:20260430.38ab2a1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- yeaight7/agent-powerups
- Path
skills/json-canvas/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260430.38ab2a1, committed Apr 30, 2026
- First version recorded
- Apr 30, 2026
- Size
- 4,864 bytes
- Repository stars
- 7
- License
- Apache-2.0
Create and edit JSON Canvas files (.canvas) with nodes, edges, groups, and connections. Use when working with .canvas files, creating visual canvases, mind maps, flowcharts, or when the user mentions Canvas files in Obsidian.
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
# JSON Canvas Skill
## File Structure
A canvas file (`.canvas`) contains two top-level arrays following the [JSON Canvas Spec 1.0](https://jsoncanvas.org/spec/1.0/):
```json
{
"nodes": [],
"edges": []
}
```
## Common Workflows
### 1. Create a New Canvas
1. Create a `.canvas` file with the base structure `{"nodes": [], "edges": []}`
2. Generate unique 16-character hex IDs for each node (e.g., `"6f0ad84f44ce9c17"`)
3. Add nodes with required fields: `id`, `type`, `x`, `y`, `width`, `height`
4. Add edges referencing valid node IDs via `fromNode` and `toNode`
5. **Validate**: Verify all `fromNode`/`toNode` values exist in the nodes array
### 2. Add a Node to an Existing Canvas
1. Read and parse the existing `.canvas` file
2. Generate a unique ID that does not collide with existing IDs
3. Choose position (`x`, `y`) that avoids overlapping existing nodes (50-100px spacing)
4. Append the new node object to the `nodes` array
5. **Validate**: Confirm all IDs are unique and all edge references resolve
### 3. Connect Two Nodes
1. Identify the source and target node IDs
2. Generate a unique edge ID
3. Set `fromNode` and `toNode` to the source and target IDs
…Read the whole file at its exact version.
How to install
mdr add yeaight7/agent-powerups/json-canvas@sha256:1e50ac693c2b3fa0The line at the top of this page pins the label git:20260430.38ab2a1, 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_m67y5njwf5ao7qiq)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, all committed on Apr 30, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260430.38ab2a1 latest | 2026-04-30 | 38ab2a1 | 4,864 B | A | view · diff |
| git:20260430.efd3794 | 2026-04-30 | efd3794 | 4,977 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 (4864 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
yeaight7/agent-powerups · 7 stars · license Apache-2.0 · pushed 2026-09-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_m67y5njwf5ao7qiq GET https://markdownregistry.com/api/v1/resolve?ref=yeaight7/agent-powerups/json-canvas GET https://markdownregistry.com/api/v1/blob/1e50ac693c2b3fa017bc6e5bbd5f06ee7879b861e20023da9b6c0e174ccea6bc
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.
More from yeaight7/agent-powerups
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