Imported from hustcc/ai-figure (SKILL.md). Install upstream with npx skills add hustcc/ai-figure. Copyright stays with the author (MIT).

ai-figure Skill

Generates self-contained SVG diagrams. No coordinates needed — layout is computed automatically.

Install

npm install ai-figure

CDN (browser, no bundler)

<script src="https://cdn.jsdelivr.net/npm/ai-figure/dist/index.global.js"></script>
<!-- or: https://unpkg.com/ai-figure/dist/index.global.js -->
<script>
  // Global: AiFigure.fig(...)
  document.getElementById('chart').innerHTML = AiFigure.fig('figure flow\na[A] --> b[B]');
</script>

Usage

import { fig } from 'ai-figure';

// Markdown string (preferred — compact, streaming-safe)
const svg = fig(`
  figure flow
  direction: LR
  palette: antv
  title: CI Pipeline
  subtitle: automated build and deploy
  code[Write Code] --> test{Tests Pass?}
  test --> build[Build Image]: yes
  test --> fix((Fix Issues)): no
  fix --> code
  build --> deploy[/Deploy/]
  group Pipeline: code, test, build
`);

// JSON config object (programmatic / strongly-typed)
const svg2 = fig({ figure: 'flow', nodes: [...], edges: [...] });

// DOM: document.getElementById('chart').innerHTML = svg;
// Node.js: fs.writeFileSync('chart.svg', svg);

fig() accepts either a markdown string or a JSON config. When given a string it never throws — partial or empty input (e.g. during AI streaming) returns a valid empty SVG that fills in progressively.

Markdown syntax

First line must be: figure <type> — this is the required header, not a key: value config line.

Valid types: flow tree mindmap arch sequence quadrant gantt state er timeline swimlane bubble radar

Config lines use key: value syntax. Data lines use diagram-specific patterns.

Lines starting with %% are comments.

Node notation (flow / tree / mindmap / arch)

flow

figure flow
direction: LR
palette: antv
title: My Flow
subtitle: data pipeline example
A[Source] --> B[Target]          %% simple edge
A --> B[Target]: label           %% labeled edge
group Name: id1, id2, id3        %% logical group (dashed border)

tree

figure tree
direction: LR
title: Org Chart
subtitle: company structure
root[Root]
root --> child[Child]
child --> leaf[Leaf]

mindmap

figure mindmap
title: Product Strategy
subtitle: 2026 planning map
root[Product Strategy]
root --> market[Market]
root --> tech[Technology]
market --> smb[SMB]
market --> ent[Enterprise]
tech --> ai[AI Features]

arch

figure arch
direction: TB
palette: antv
title: Web Stack
subtitle: three-tier architecture
layer Frontend
  ui[React App]
  assets[Static Assets]
layer Backend
  api[REST API]
  auth[Auth Service]
layer Data
  db[PostgreSQL]

sequence

figure sequence
title: Login
subtitle: OAuth2 password flow
actors: Browser, API, DB         %% optional; inferred from messages if omitted
Browser -> API: POST /login      %% solid arrow
API --> Browser: 200 OK          %% dashed return arrow

quadrant

figure quadrant
title: Priority
subtitle: effort vs value
x-axis Effort: Low .. High
y-axis Value: Low .. High
quadrant-1: Quick Wins    %% top-left
quadrant-2: Strategic     %% top-right
quadrant-3: Low Prio      %% bottom-left
quadrant-4: Long Shots    %% bottom-right
Feature A: 0.2, 0.9       %% label: x, y  (x/y in [0,1])

gantt

figure gantt
title: Q1 Roadmap
subtitle: Jan – Mar 2025
section Design
  Wireframes: t1, 2025-01-06, 2025-01-24    %% label: id, start, end
  Mockups: t2, 2025-01-25, 2025-02-07
section Dev
  Frontend: t3, 2025-02-03, 2025-02-28
milestone: Launch, 2025-03-01

• Task format: <label>: <id>, <yyyy-mm-dd>, <yyyy-mm-dd> — id is required, even if you don't reference it
• end ≥ start; section groups tasks under a bold header; milestone: <label>, <date> marks a point in time

state

figure state
title: Order Status
subtitle: e-commerce order lifecycle
idle[Idle]
processing[Processing]
accent: failed                   %% mark as accent/focal state
start --> idle                   %% start pseudo-state
idle --> processing: order placed
processing --> end: shipped
processing --> failed: error
failed --> idle: retry

• id[label] — normal state (rounded rectangle)
• start / end — reserved pseudo-state ids (filled circle / ringed circle)
• id --> id2: event — transition with optional label
• accent: id — mark a state as the focal/error state (max 1–2)

er

figure er
title: Blog Schema
subtitle: users and posts
entity User
  id pk: uuid
  email: text
entity Post
  id pk: uuid
  author_id fk: uuid
  title: text
User --> Post: writes

• entity Name — declare an entity box (name used as id and label)
• Fields: name pk: type (primary key), name fk: type (foreign key), name: type, or bare name
• A --> B: label — relationship line with optional label
• accent: EntityName to mark the aggregate root entity

timeline

figure timeline
title: Product History
subtitle: major releases
2020-01-15: v1.0 Launch milestone   %% major milestone (larger accent dot)
2021-06-01: v1.5 Improvements
2022-03-10: v2.0 Redesign milestone
2023-11-01: v3.0 AI Features

• Lines: yyyy-mm-dd: label or yyyy-mm-dd: label milestone
• Events are sorted chronologically and spaced proportionally on a horizontal axis
• Labels alternate above and below the baseline to reduce collision

swimlane

figure swimlane
title: Order Flow
subtitle: cross-team process
section Customer
  order[Place Order]
  pay[Confirm Payment]
section Warehouse
  receive[Receive Order]
  pack[Pack Items]
section Shipping
  ship[Ship Package]
order --> pay
pay --> receive
receive --> pack
pack --> ship

• section LaneName — declares a new lane; subsequent node lines belong to it
• id[Node Label] — node declaration inside the current lane
• A --> B or A --> B: label — directed edges (may cross lanes)

bubble

figure bubble
title: Market Analysis
subtitle: by product segment
%% label: value (positive number)
Product A: 75
Product B: 50
Product C: 85

• Data lines: Label: value — any positive number; bubble area is proportional to value
• Positions computed automatically; no coordinates needed

radar

figure radar
title: Framework Comparison
subtitle: 2025 technical evaluation
axes: Performance, Scalability, DX, Ecosystem, Tooling
React: 75, 80, 90, 95, 88
Vue: 82, 72, 90, 82, 80
Angular: 65, 92, 72, 90, 86

• axes: — comma-separated list of axis labels (3 or more recommended); each becomes a spoke of the web
• Series lines: Series Name: v1, v2, v3, ... — one numeric value per axis, range 0–100 (treated as a percentage of the axis maximum; values are clamped)
• Multiple series can be overlaid; each is assigned a different palette color
• A legend with colored dots and series names appears below the chart

Common pitfalls

These mistakes may produce unexpected or broken diagrams:

JSON config (fig(options))

Same result as markdown but typed. Use when building diagrams programmatically.

All options share: title?, subtitle?, theme?: 'light'|'dark', palette?: string|string[], and (where applicable) direction?: 'TB'|'LR'.

// flow
{ figure: 'flow', nodes: FlowNode[], edges: FlowEdge[], groups?: FlowGroup[] }
// FlowNode:  { id, label, type?: 'process'|'decision'|'terminal'|'io' }
// FlowEdge:  { from, to, label? }
// FlowGroup: { id, label, nodes: string[] }

// tree
{ figure: 'tree', nodes: TreeNode[] }
// TreeNode: { id, label, parent? }

// mindmap
{ figure: 'mindmap', nodes: MindmapNode[] }
// MindmapNode: { id, label, parent?, side?: 'left'|'right' }

// arch
{ figure: 'arch', layers: ArchLayer[] }
// ArchLayer: { id, label, nodes: { id, label }[] }

// sequence
{ figure: 'sequence', actors: string[], messages: SeqMessage[] }
// SeqMessage: { from, to, label?, style?: 'solid'|'return' }

// quadrant — quadrants: [top-left, top-right, bottom-left, bottom-right]; x=0 left, y=0 bottom
{ figure: 'quadrant', xAxis: { label, min, max }, yAxis: { label, min, max },
  quadrants: [string, string, string, string], points: QuadrantPoint[] }
// QuadrantPoint: { id, label, x, y }  x/y in [0,1]

// gantt
{ figure: 'gantt', tasks: GanttTask[], milestones?: GanttMilestone[] }
// GanttTask:      { id, label, start, end, groupId? }  start/end: 'yyyy-mm-dd'
// GanttMilestone: { date, label }

// state
{ figure: 'state', nodes: StateNode[], transitions: StateTransition[] }
// StateNode:       { id, label, type?: 'state'|'start'|'end', accent?: boolean }
// StateTransition: { from, to, label? }

// er
{ figure: 'er', entities: ErEntity[], relations: ErRelation[] }
// ErEntity:  { id, label, fields: ErField[], accent?: boolean }
// ErField:   { name, type?, key?: 'pk'|'fk' }
// ErRelation: { from, to, label? }

// timeline
{ figure: 'timeline', events: TimelineEvent[] }
// TimelineEvent: { id, label, date, milestone? }  date: 'yyyy-mm-dd'

// swimlane
{ figure: 'swimlane', lanes: string[], nodes: SwimlaneNode[], edges: SwimlaneEdge[] }
// SwimlaneNode: { id, label, lane, type? }  lane = one of lanes[]
// SwimlaneEdge: { from, to, label? }

// bubble
{ figure: 'bubble', items: BubbleItem[] }
// BubbleItem: { label, value }  — value is a positive number; area proportional to value

// radar
{ figure: 'radar', axes: string[], series: RadarSeries[] }
// RadarSeries: { label, values }  — values are 0-100 (one per axis); clamped to [0,100]