Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add jxoesneon/Ciel --skill json-canvasgit clone --depth 1 https://github.com/jxoesneon/CielWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/jxoesneon/ciel/json-canvas)<a href="https://agentmods.dev/skills/jxoesneon/ciel/json-canvas"><img src="https://agentmods.dev/badge/skills/jxoesneon/ciel/json-canvas/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/jxoesneon/ciel/json-canvas"><img src="https://agentmods.dev/badge/skills/jxoesneon/ciel/json-canvas.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00044 | $0.01079 |
| Opus 5 | $0.00022 | $0.00540 |
| Sonnet 5 | $0.00009 | $0.00216 |
| Haiku 4.5 | $0.00004 | $0.00108 |
Grade A, and why
json-canvas scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CIEL ADAPTATION: JSON Canvas
Create and edit JSON Canvas files (.canvas) following the JSON Canvas Spec 1.0. Build visual canvases, mind maps, flowcharts, and project boards with typed nodes, connecting edges, and grouping containers.
File Structure
- Two top-level arrays:
{"nodes": [], "edges": []}(both optional) nodes— placed objects; array order = z-index (first = bottom, last = top)edges— connections referencing node IDs
Workflows
- Create canvas: Base structure → generate unique 16-char hex IDs → add nodes (required:
id,type,x,y,width,height) → add edges → validate - Add node: Parse existing → generate non-colliding ID → position with 50-100px spacing → append → optionally add edges → validate
- Connect nodes: Identify source/target IDs → unique edge ID → set
fromNode/toNode→ optionalfromSide/toSide/label→ append → validate - Edit: Parse JSON → locate by
id→ modify attributes → write back → re-validate
Node Types
- text: required
text(Markdown-supported plain text) - file: required
file(vault path); optionalsubpath(heading/block, starts with#) - link: required
url(external URL) - group: optional
label,background,backgroundStyle(cover/ratio/repeat); visually contains child nodes positioned inside its bounds
Generic Node Attributes
- Required:
id(16-char hex),type,x,y,width,height - Optional:
color— preset"1"-"6"(red/orange/yellow/green/cyan/purple) or hex ("#FF0000")
Edge Attributes
- Required:
id,fromNode,toNode - Optional:
fromSide/toSide(top/right/bottom/left),fromEnd/toEnd(none/arrow; defaulttoEnd=arrow),color,label
Layout & IDs
- Coordinates can be negative;
xincreases right,yincreases down; position is top-left corner - Space nodes 50-100px apart; 20-50px padding inside groups; align to grid (multiples of 10-20)
- Suggested sizes: small text 200-300×80-150; medium 300-450×150-300; file/link preview 250-500×100-400
- IDs: 16-char lowercase hex (64-bit random), unique across BOTH nodes and edges
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 74 lines · 44 tokens per session scan A 33bca2095714
json-canvas is a skill published in the GitHub repository jxoesneon/Ciel (1 stars, last pushed 4d ago), licensed Apache-2.0. It adds 44 tokens to every session and 1,079 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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