json-canvas

json-canvas is a skill for Claude Code from lululu811/init-knowledge-base. It costs 75 tokens per session (2,451 once invoked), scanned A, original, MIT.

A skill for creating and editing Obsidian Canvas files, which are visual boards for arranging notes, links, text, and groups. It can turn relationships between wiki pages into a diagram.

In plain words
What is it for?
Use it to create or update .canvas files for visual knowledge graphs, mind maps, and process diagrams, including diagrams based on pages in a wiki folder.
Why use it?
It removes the manual work of laying out knowledge networks, mind maps, and flowcharts in Obsidian. The result follows the JSON Canvas 1.0 file format.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

Install

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.

agentmods
npx agentmods add skills/lululu811/init-knowledge-base/json-canvas
Any agent
npx skills add lululu811/init-knowledge-base --skill json-canvas
Clone the repo
git clone --depth 1 https://github.com/lululu811/init-knowledge-base

Made for: Claude Code.

Wrote 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.

agentmods badge for json-canvas

README.md
[![agentmods](https://agentmods.dev/badge/skills/lululu811/init-knowledge-base/json-canvas.svg)](https://agentmods.dev/skills/lululu811/init-knowledge-base/json-canvas)
Your own site
<a href="https://agentmods.dev/skills/lululu811/init-knowledge-base/json-canvas"><img src="https://agentmods.dev/badge/skills/lululu811/init-knowledge-base/json-canvas.svg" alt="Measured on agentmods" height="20"></a>
Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,451 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00075 $0.02451
Opus 5 $0.00037 $0.01226
Sonnet 5 $0.00015 $0.00490
Haiku 4.5 $0.00007 $0.00245

Measured 6d ago against content hash 840c1ed71ed6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

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 6d 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.

_templates/.claude/skills/json-canvas/SKILL.md · 328 lines

How it starts

The opening of the file, as written. The whole thing — 328 lines — stays where its author put it; the contents beside it link to each section on GitHub.

JSON Canvas 技能

本技能用于创建和编辑符合 JSON Canvas 1.0 规范的 .canvas 文件,实现知识网络的可视化呈现。


文件结构

Canvas 文件是标准 JSON,包含两个顶级数组:

{
  "nodes": [],
  "edges": []
}
  • nodes:节点数组(可选)
  • edges:连接节点的边数组(可选)

节点(Nodes)

四种节点类型:textfilelinkgroup

通用属性

属性 必需 类型 说明
id string 唯一标识符(16位小写十六进制)
type string 节点类型
x integer X 坐标(像素)
y integer Y 坐标(像素)
width integer 宽度(像素)
height integer 高度(像素)
color string 颜色(预设 "1"-"6" 或 HEX)

文本节点(text)

{
  "id": "6f0ad84f44ce9c17",
  "type": "text",
  "x": 0,
  "y": 0,
  "width": 400,
  "height": 200,
  "text": "# 核心概念\n\n这是 **Markdown** 内容。"
}

换行转义:JSON 字符串中的换行必须写为 \n,不能写字面量 \\n

文件节点(file)

引用 Vault 内的文件:

{
  "id": "a1b2c3d4e5f67890",
  "type": "file",
  "x": 500,
  "y": 0,
  "width": 400,
  "height": 300,
  "file": "assets/diagram.png"
}

引用笔记中的特定标题:

{
  "id": "b2c3d4e5f6789012",
  "type": "file",
  "x": 500,
  "y": 400,
  "width": 400,
  "height": 300,
  "file": "wiki/concepts/Transformer.md",
  "subpath": "#核心组件"
}

链接节点(link)

外部 URL:

{
  "id": "c3d4e5f678901234",
  "type": "link",
  "x": 1000,
  "y": 0,
  "width": 400,
  "height": 200,
  "url": "https://obsidian.md"
}

分组节点(group)

视觉容器,用于组织其他节点:

{
  "id": "d4e5f6789012345a",
  "type": "group",
  "x": -50,
  "y": -50,
  "width": 1000,
  "height": 600,
  "label": "项目概览",
  "color": "4"
}

带背景图:

{
  "id": "e5f67890123456ab",
  "type": "group",
  "x": 0,
  "y": 700,
  "width": 800,
  "height": 500,
  "label": "资源",
  "background": "assets/background.png",
  "backgroundStyle": "cover"
}

背景样式:cover(填充)、ratio(保持比例)、repeat(平铺)。


边(Edges)

连接节点的线条:

{
  "id": "f67890123456789a",
  "fromNode": "6f0ad84f44ce9c17",
  "toNode": "a1b2c3d4e5f67890"
}

完整属性:

{
  "id": "0123456789abcdef",
  "fromNode": "节点A-ID",
  "fromSide": "right",
  "fromEnd": "none",
  "toNode": "节点B-ID",
  "toSide": "left",
  "toEnd": "arrow",
  "color": "1",
  "label": "导致"
}

Read the full file on GitHub · 328 lines

Changes

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.

  1. 6d ago First seen · 328 lines · 75 tokens per session scan A 840c1ed71ed6

Subscribe to this mod's changes

json-canvas is a skill published in the GitHub repository lululu811/init-knowledge-base (23 stars, last pushed 21d ago), licensed MIT. It adds 75 tokens to every session and 2,451 once invoked, about $0.0004 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 2026-08-30.

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