Extensions

Extensions add new capabilities to Spec Kit — domain-specific commands, external tool integrations, quality gates, and more. They introduce new commands and templates that go beyond the built-in Spec-Driven Development workflow.

Search Available Extensions

specify extension search [query]

Option	Description
--tag	Filter by tag
--author	Filter by author
--verified	Show only verified extensions

Searches all active catalogs for extensions matching the query. Without a query, lists all available extensions.

Install an Extension

specify extension add <name>

Option	Description
--dev	Install from a local directory (for development)
--from <url>	Install from a custom URL instead of the catalog
--force	Overwrite if the extension is already installed
--priority <N>	Resolution priority (default: 10; lower = higher precedence)

Installs an extension from the catalog, a URL, or a local directory. Extension commands are automatically registered with the currently installed AI coding agent integration.

Note: All extension commands require a project already initialized with specify init.

Remove an Extension

specify extension remove <name>

Option	Description
--keep-config	Preserve configuration files during removal
--force	Skip confirmation prompt

Removes an installed extension. Configuration files are backed up by default; use --keep-config to leave them in place or --force to skip the confirmation.

List Installed Extensions

specify extension list
specify extension list --json

Option	Description
--available	Show available (uninstalled) extensions
--all	Show both installed and available extensions
--json	Write installed extensions as JSON

Lists installed extensions with their status, version, and command counts.

--json writes a JSON array to stdout. Every item has the keys id, name, description, version, author, priority, enabled, source, and provides. author is null when absent; source is \{"kind":"local"\} for local, legacy, or malformed provenance, or