V2.4

Vela Slides Skill

v2.4.0 · Compact format (~30% fewer LLM tokens), vela deck compact/expand, auto-expand pipeline

Generate presentation-ready slide decks and assemble them into runnable Vela .jsx artifacts.

When to Use

• User wants to create a slide deck / presentation
• User provides a topic, agenda, outline, or document to turn into slides
• User wants to restyle or improve existing Vela slide JSON

Before You Start

Read the references — they contain the complete block schema, design patterns, and theming system:

Read references/block-schema.md    # All 20+ block types with properties
Read references/design-patterns.md # Layout rules, slide archetypes, composition
Read references/themes.md          # Color palettes, theming system

Architecture

For app editing (part-files, concat, template), read references/app-editing.md.

Vela CLI Setup

The vela CLI is a single entry point for all deck operations. Install once per session:

export PATH="/home/claude/.local/bin:$PATH"
ln -sf /mnt/skills/user/vela-slides/scripts/vela.py /home/claude/.local/bin/vela

Compact Format (~30% fewer LLM tokens)

When generating a new deck, the LLM outputs compact JSON — minified, with short keys, flat slides array, theme presets, and spacer shorthand. The CLI auto-expands to full Vela JSON on ship.

Full JSON	Compact JSON
"type": "heading"	"_": "heading"
"text": "..."	"x": "..."
{"type":"spacer","h":8}	8
"bg":"#0A0F1C",... per slide	"t":"d" (theme ref)
"lanes":[{"items":[{"slides":[...]}]}]	"S":[...]

Compact key reference

Slide level: n=title, d=duration, t=theme, B=blocks, p=padding

Block level: _=type, x=text, s=size, c=color, i=icon, b=bg, ic=iconColor, I=items, B=blocks, g=gap, lb=label, w=weight, H=headers, R=rows

Commands

vela deck compact full.json compact.json
vela deck expand compact.json full.json
vela deck ship compact.json    # auto-expands

Workflow A: Generate a Deck (most common)

Step 1: Generate Compact JSON

Always generate in compact format — saves ~30% output tokens.

Rules:

1. Top-level: {"n":"Title","T":{themes},"S":[slides]}
2. Themes (T): group slides by bg/color/accent/padding. "d" = dark, "l" = light.
3. Slides (S): flat array. Each slide has "t":"d", "n", "d", "B".
4. Blocks: short keys (_=type, x=text, s=size, etc.)
5. Spacers: just the int 8 instead of {"_":"spacer","h":8}
6. Minified: no whitespace.

Example (3-slide compact deck)

{"n":"AI Workshop","T":{"d":{"b":"#0A0F1C","c":"#E6F1FF","a":"#3B82F6","p":"60px 72px"},"l":{"b":"#ffffff","c":"#1e293b","a":"#3B82F6","p":"36px 48px"}},"S":[{"t":"d","n":"Cover","d":15,"B":[{"_":"badge","x":"WORKSHOP","i":"GraduationCap","b":"#3B82F620","c":"#3B82F6"},8,{"_":"heading","x":"AI para Equipas","s":"3xl","w":700},{"_":"text","x":"Formação prática com LLMs.","s":"lg","c":"#8892B0"}]},{"t":"l","n":"Agenda","d":60,"B":[{"_":"badge","x":"PROGRAMA","i":"Calendar","b":"#3B82F615","c":"#3B82F6"},8,{"_":"heading","x":"Agenda do Dia","s":"2xl"},{"_":"steps","I":[{"title":"09:00","x":"Fundamentos"},{"title":"13:30","x":"Agentes"}],"lnc":"#3B82F6","nc":"#3B82F6","tc":"#1e293b","xc":"#64748b"}]},{"t":"d","n":"CTA","d":20,"B":[{"_":"heading","x":"Vamos Construir?","s":"3xl","w":700},12,{"_":"text","x":"[email protected]","s":"lg","c":"#8892B0"}]}]}

Step 2: Ship

vela deck ship /home/claude/<deck-name>-slides.json

Step 3: Present

present_files(["/mnt/user-data/outputs/<deck>.jsx", "/mnt/user-data/outputs/<deck>-slides.json"])

Workflow A½: Edit an Existing Deck

vela deck list deck.json
vela slide view deck.json 3
vela slide edit deck.json 3 block.2.text "New heading"
vela deck replace-text deck.json "old text" "new text"
vela slide remove deck.json 4
vela slide move deck.json 5 2
vela slide duplicate deck.json 2
vela slide insert deck.json 3 new-slide.json
vela deck ship deck.json

Critical Rules

Canvas

• Virtual canvas: 960x540px (16:9)
• Base padding: "36px 48px" — never less
• Max 5-7 blocks per slide

Duration

• Every slide MUST have duration (integer, seconds)
• Title: 15-30s | Content: 60-90s | Dense: 90-180s

Visual Design

• Every slide MUST have bg or bgGradient
• Size hierarchy: 3xl-4xl titles > 2xl headings > lg body > sm captions
• Use icons generously. Use spacer blocks for breathing room.

Block Selection

• Don't default to heading+bullets — vary layouts
• icon-row > plain bullets | flow for processes | grid for comparisons
• steps for sequences | callout for insights | table for data

Theming

See references/themes.md for palettes.

Icons

PascalCase Lucide names. Common: Zap, Brain, Rocket, Shield, Target, Clock, Users, Heart, Globe, Code, Database, Lightbulb, TrendingUp, BarChart, Lock, Eye, Cpu, Layers, Bot, Sparkles