I built a marketing brain you can install in 30 seconds
12 skills, 5 commands, and zero prompt engineering required, all inside Claude’s desktop app.
Hey Adopter,
Last week I talked with a client’s leadership team. They wanted to roll out AI across their marketing department. Hand everyone a licence, load up some prompts, let them loose. Sounded reasonable until I asked one question: who’s going to direct these tools?
Silence…
Giving your team an AI assistant without structured instructions is like hiring a brilliant intern with no onboarding. They’ll produce something, sure. Whether it’s useful is another story.
That conversation pushed me to finish something I’ve been building. A single plugin file that turns Claude’s desktop app into a trained marketing operator, 12 skills, 5 slash commands, zero prompt engineering required. Today I’m walking you through what it is, why it matters more than saved prompts or project files, and how you can install it in 30 seconds.
Let me start with the foundation for anyone who hasn’t tried this yet.
Claude’s desktop app changed how we work
Anthropic shipped a mode inside Claude’s desktop app called Cowork. Think of it as Claude with hands. It reads your files, writes documents, browses the web, connects to your email and calendar, and executes multi-step tasks without you babysitting each click.
The old way of using AI was a chat box. You typed, it responded, you copied the output somewhere else. Cowork flipped that. You point it at real work, and it does real work. Spreadsheets, slide decks, research reports, code. It operates on your actual files in your actual folders.
That alone makes it worth switching to. But Cowork’s real power comes from something most people haven’t touched yet.
Plugins turn Claude from a generalist into a specialist
A plugin is a bundle of instructions you install into Cowork. Once loaded, Claude stops being a generic chatbot and starts behaving like a trained team member who knows your playbook.
My marketing plugin ships with two types of ammunition.
Slash commands are one-liners that trigger complex workflows. Type
/audit-pagewith a URL and Claude runs a full conversion rate optimisation analysis with copy critique, ranked issues, and specific rewrites. Type/seo-checkand it runs both traditional and AI search engine audits on the same page. Five commands total, each one replacing what used to be a 30-minute manual process.Skill files are the deep knowledge layer. These are detailed instruction sets that tell Claude how to think about a specific marketing discipline. Page CRO, signup flow optimisation, A/B test design, email sequences, copywriting, content strategy, schema markup, AI SEO, and more. 12 skills in total, each one refined through hundreds of real-world runs.
The difference between prompting and a plugin is the difference between giving someone directions every time they drive to work versus giving them a GPS that already knows the route.
Why this beats prompting, projects, and prompt libraries
Most marketers using AI right now fall into one of three camps.
Camp one saves prompts in a Google Doc and pastes them into ChatGPT when needed. Works until you have 200 prompts and can’t remember which version was the good one.
Camp two uses Claude Projects or custom GPTs. Better. You get persistent instructions. But those instructions live in a single block of text, they don’t coordinate with each other, and they cap out fast once you need more than surface-level guidance.
Camp three isn’t really a camp yet. These are the people running plugin systems where skills reference each other, commands chain multiple skill files together, and the AI pulls from structured knowledge instead of a wall of prose.
That third camp is where the gap opens up.