spec-kit/presets/README.md

Presets

Presets are stackable, priority-ordered collections of template and command overrides for Spec Kit. They let you customize both the artifacts produced by the Spec-Driven Development workflow (specs, plans, tasks, checklists, constitutions) and the commands that guide the LLM in creating them — without forking or modifying core files.

How It Works

When Spec Kit needs a template (e.g. spec-template), it walks a resolution stack:

1. .specify/templates/overrides/ — project-local one-off overrides
2. .specify/presets/<preset-id>/templates/ — installed presets (sorted by priority)
3. .specify/extensions/<ext-id>/templates/ — extension-provided templates
4. .specify/templates/ — core templates shipped with Spec Kit

If no preset is installed, core templates are used — exactly the same behavior as before presets existed.

For detailed resolution and command registration flows, see ARCHITECTURE.md.

Command Overrides

Presets can also override the commands that guide the SDD workflow. Templates define what gets produced (specs, plans, constitutions); commands define how the LLM produces them (the step-by-step instructions).

When a preset includes type: "command" entries, the commands are automatically registered into all detected agent directories (.claude/commands/, .gemini/commands/, etc.) in the correct format (Markdown or TOML with appropriate argument placeholders). When the preset is removed, the registered commands are cleaned up.

Quick Start

# Search available presets
specify preset search

# Install a preset from the catalog
specify preset add healthcare-compliance

# Install from a local directory (for development)
specify preset add --dev ./my-preset

# Install with a specific priority (lower = higher precedence)
specify preset add healthcare-compliance --priority 5

# List installed presets
specify preset list

# See which template a name resolves to
specify preset resolve spec-template

# Get detailed info about a preset
specify preset info healthcare-compliance

# Remove a preset
specify preset remove healthcare-compliance

Stacking Presets

Multiple presets can be installed simultaneously. The --priority flag controls which one wins when two presets provide the same template (lower number = higher precedence):

specify preset add enterprise-safe --priority 10      # base layer
specify preset add healthcare-compliance --priority 5  # overrides enterprise-safe
specify preset add pm-workflow --priority 1            # overrides everything

Presets override, they don't merge. If two presets both provide spec-template, the one with the lowest priority number wins entirely.

Catalog Management

Presets are discovered through catalogs. By default, Spec Kit uses the official and community catalogs:

# List active catalogs
specify preset catalog list

# Add a custom catalog
specify preset catalog add https://example.com/catalog.json --name my-org --install-allowed

# Remove a catalog
specify preset catalog remove my-org

Creating a Preset

See scaffold/ for a scaffold you can copy to create your own preset.

1. Copy scaffold/ to a new directory
2. Edit preset.yml with your preset's metadata
3. Add or replace templates in templates/
4. Test locally with specify preset add --dev .
5. Verify with specify preset resolve spec-template

Environment Variables

Variable	Description
SPECKIT_PRESET_CATALOG_URL	Override the catalog URL (replaces all defaults)

Configuration Files

File	Scope	Description
.specify/preset-catalogs.yml	Project	Custom catalog stack for this project
~/.specify/preset-catalogs.yml	User	Custom catalog stack for all projects

Future Considerations

The following enhancements are under consideration for future releases:

• Composition strategies — Allow presets to declare a strategy per template instead of the default replace:

  Type	replace	prepend	append	wrap
  template	✓ (default)	✓	✓	✓
  command	✓ (default)	✓	✓	✓
  script	✓ (default)	—	—	✓

  For artifacts and commands (which are LLM directives), wrap would inject preset content before and after the core template using a {CORE_TEMPLATE} placeholder. For scripts, wrap would run custom logic before/after the core script via a $CORE_SCRIPT variable.

• Script overrides — Enable presets to provide alternative versions of core scripts (e.g. create-new-feature.sh) for workflow customization. A strategy: "wrap" option could allow presets to run custom logic before/after the core script without fully replacing it.