VisualSpec

VisualSpec

Deterministic visual generation for AI agents.
AI creates the imagery. VisualSpec guarantees the typography and layout.

[VisualSpec Generation Pipeline Demo]

[npm package] [MCP Registry] [License] [Tests] [GitHub stars]

# Instant workspace setup (no clone required)npx @utkarshx27/visualspec init
# Launch local MCP Server for Cursor, Claude Desktop, or Antigravitynpx @utkarshx27/visualspec mcp

The Core Problem

Most image-generation workflows fail for social and marketing graphics because a single natural-language prompt is expected to handle too many concerns at once:

• subject & background
• exact typography & wording
• platform dimensions & safe margins
• visual hierarchy & negative space
• brand color rules & constraints

Image models frequently hallucinate gibberish text, truncate words, or disregard composition rules.

The Solution: Layer Separation

VisualSpec separates generative concerns from deterministic concerns:

1. Generative Layers (AI Models): Photography, 3D subjects, atmospheric backgrounds, textures, lighting.
2. Deterministic Layers (Code & SVG Engine): Exact headlines, subtitles, badges, logos, metrics, safe margins, and layout rules.
3. Structured Visual Spec: A machine-readable YAML specification that acts as the single contract.
4. Visual QA & Targeted Repair: Verifies geometry, margins, and exact copy invariants, synthesizing localized repairs without regenerating entire scenes.

User Brief / Intent       │       ▼   Visual Spec (spec.yaml)       │   ┌───┴──────────────┐   ▼                  ▼Platform Pack    Template Pack   │                  │   └───┬──────────────┘       ▼   Spec Resolver       │   ┌───┴───────────────────────┐   ▼                           ▼Model Adapter           Deterministic Layout(Generative Base)       (SVG Typography / Overlay)   │                           │   └───┬───────────────────────┘       ▼  Compositor (Sharp)       │       ▼   Visual QA (Constraints, Safe Margins, Exact Copy)       │       ├── PASS ──► Final Asset Bundle       │       └── FAIL ──► Targeted Repair Planner

Documentation

• Architecture & Design Principles
• VisualSpec Schema & Contract
• MCP Server Setup (Cursor, Claude, Antigravity)
• Adding a New Image Model Provider
• Contributing Guidelines

Quickstart

Instant Run (No Install Required)

# Initialize a new VisualSpec workspacenpx @utkarshx27/visualspec init
# Launch local MCP Server for Cursor, Claude, or Antigravity IDEnpx @utkarshx27/visualspec mcp

Or Install Globally

npm install -g @utkarshx27/visualspec
# Use CLI commands directlyvisual initvisual mcp

Or Build from Source

git clone https://github.com/utkarshx27/visualspec.gitcd visualspecnpm installnpm run build

1. Initialize a Project

npx @utkarshx27/visualspec init

2. Validate a Visual Spec

npx @utkarshx27/visualspec validate examples/product-launch/spec.yaml

3. Inspect the Compiled Generation Prompt

npx @utkarshx27/visualspec compile examples/product-launch/spec.yaml --provider openai

4. Deterministic Render (No API Key Required)

Render layout, typography, and background styling locally:

npx @utkarshx27/visualspec render examples/product-launch/spec.yaml --output ./output/demo-launch

5. Run the Full Generation Pipeline

npx @utkarshx27/visualspec generate examples/product-launch/spec.yaml --provider mock --output ./output/demo-launch

6. Verify Asset Quality with Visual QA

npx @utkarshx27/visualspec check ./output/demo-launch/final.png --spec examples/product-launch/spec.yaml

Model Context Protocol (MCP) Server

VisualSpec runs as a native MCP server over stdio, enabling AI coding assistants (Cursor, Claude Code, Gemini CLI, and Antigravity IDE) to invoke visual tools directly:

# Launch MCP server over stdionpx @utkarshx27/visualspec mcp
# Or if installed globallyvisual mcp

Available MCP Tools

• visual_brief_to_spec: Convert natural language requests into valid VisualSpec YAML.
• visual_validate_spec: Schema validation for specs.
• visual_render: Deterministic layout & typography rendering (zero API key).
• visual_generate: Full image model adapter + deterministic text overlay pipeline.
• visual_check_qa: Inspect safe margins, line counts, dimensions, and invariants.
• visual_repair: Automated diagnosis and localized typography/layout repair.
• visual_list_resources: List supported platform packs and templates.

See the MCP Setup Guide for Cursor, Claude Desktop, and Antigravity IDE configuration snippets.

Output Bundle

Every generation creates a complete, reproducible debug bundle:

output/demo-launch/├── final.png                 # Platform-ready asset├── visual-spec.yaml          # Original input specification├── resolved-spec.yaml        # Full spec with platform & template rules applied├── generation-request.json   # Exact prompt and negative parameters sent to model├── qa-report.json            # Deterministic and constraint QA verification results└── metadata.json             # Execution timestamps and file index

Supported Platforms & Templates

Platforms

• Instagram: Feed portrait (1080x1350, 4:5), Square (1080x1080, 1:1), Story (1080x1920, 9:16).
• LinkedIn: Feed portrait (1080x1350), Square (1080x1080), Banner (1200x628).
• Generic Social: Universal 1:1, 4:5, and 16:9 social formats.

Templates

• Product Launch: High-impact headline, feature pill, product visual region, supporting subhead.
• Quote Card: Center-focused editorial quote, author attribution, minimal atmospheric glow.
• Stat Card: Large numeric hero metric, descriptive label, and data context notes.

Agent Skills

The framework includes 10 standardized skill definitions located in ./skills/:

• using-visualspec: Master workflow instructions.
• visual-brief: Brief extraction and analysis.
• visual-spec: YAML authoring and schema rules.
• composition: Spatial hierarchy and negative space allocation.
• typography: Font family classing and line budgeting.
• strict-constraints: Invariant taxonomy and forbidden parameters.
• social-instagram: Instagram-specific design reasoning.
• social-linkedin: LinkedIn-specific design reasoning.
• visual-qa: Automated inspection and validation.
• visual-repair: Localized diagnosis and patch generation.

Roadmap & Open Contributions

We welcome contributions! Key areas to build together:

• Additional Platforms: X/Twitter (Header, Post), YouTube Thumbnails, Pinterest, TikTok Cover.
• Additional Templates: Testimonial, Product Comparison, Event Announcement, Feature List.
• Additional Image Model Adapters: Flux, Stable Diffusion / ComfyUI, Midjourney API.
• Brand Packs: Multi-brand palette overrides, custom font loading, logo clear space rules.
• Visual Studio: Local web playground / viewer for real-time spec inspection and margin toggling.

Contributing

Contributions are welcome! Please check our:

• Contributing Guidelines
• Code of Conduct

Testing

Run the automated test suite:

npm test

All 28 tests run offline without requiring any third-party API keys.

License

Licensed under the Apache License, Version 2.0.