Install the Plugin

Writing Style Catalog ships as a Claude Code plugin. The recommended path is the Product on Purpose marketplace; two fallbacks cover direct-from-repo installs and the Claude.ai / Claude Desktop upload flow.

Prerequisites

Claude Code for the marketplace and direct paths.
Nothing else: the plugin is self-contained. The compose-instruction skill reads the catalog that ships inside the plugin, so there is no separate data download.

Option A - Product on Purpose marketplace (recommended)

Run these inside Claude Code:

/plugin marketplace add product-on-purpose/agent-plugins
/plugin install writing-style-catalog@product-on-purpose

You add the marketplace by its repo path (product-on-purpose/agent-plugins) and install the plugin by its marketplace identity (writing-style-catalog@product-on-purpose). Those differ by design: the path is the address, the identity is the brand.

Update later with:

/plugin update writing-style-catalog

Option B - Direct from the plugin repo

The repository also carries its own single-plugin marketplace, so you can install it without the shared marketplace:

/plugin marketplace add product-on-purpose/writing-style-catalog
/plugin install writing-style-catalog@writing-style-catalog-marketplace

This path pins to the latest tagged release. It is the fallback if you do not want the shared product-on-purpose marketplace.

Option C - Claude.ai and Claude Desktop (ZIP upload)

For clients that take a plugin as an uploaded archive:

Download writing-style-catalog-v<version>.zip from the Releases page.
Extract it. The archive root holds .claude-plugin/, skills/, and the taxonomy/ catalog the skill reads.
Point your client’s plugin setup at .claude-plugin/plugin.json in the extracted folder.

Verify it loaded

In Claude Code, confirm the skill resolves:

/writing-style-catalog:compose-instruction voice=pragmatic-architect format=adr

You should get a structured prompt prefix back. From here, the Compose an Instruction guide walks through reading and using the output.