TL;DR and context
- Five of the eight tools come from Anthropic and three from independent developers. Only PowerPoint and Excel are documented as built into Claude chat. The rest run in Cowork or Claude Code, several with a packaged download you can upload as a custom skill.
- Installing gives Claude a method, not your data. Briefs, campaign exports, approved claims and connector setup still come from you.
- Start with a task you can judge and give one tool one complete assignment before installing more.
- We reviewed Anthropic’s documentation and each repository on 28 October 2026. We have not installed or benchmarked the tools.
16 min read
Install Anthropic’s Marketing plugin and you get workflows for content drafting, campaign planning, brand review and reporting. You do not get Slack, HubSpot, Klaviyo or any other service its README lists, because each connector needs separate setup.
That gap between installing and working runs through all eight tools in this guide. A copywriting skill gives Claude a method. A research tool needs access to sources. An analytics plugin still needs your campaign data. Work out which of those your team is missing before you install anything.
This guide covers eight Claude plugins and skills for marketers, from Anthropic and independent developers. Some run in ordinary Claude chat, others in Cowork or Claude Code. We chose them by marketing task, not by GitHub stars, and ordered them so the ones you can use today without a terminal come first. If you would rather look at open-source software than Claude extensions, our guide to GitHub repositories for marketing teams covers that.
| Your situation | Start here | Where it runs, as documented |
|---|---|---|
| You need an editable campaign deck from a brief | PowerPoint skill (Anthropic) | Built into Claude chat, with a repository version available |
| You need a reusable campaign workbook | Excel skill (Anthropic) | Built into Claude chat, with a repository version available |
| You need to plan a campaign and coordinate content | Marketing plugin (Anthropic) | Cowork or Claude Code |
| You need to check campaign numbers | Data Analyst plugin (Anthropic) | Cowork or Claude Code |
| You want a specialist method for conversion, copy or SEO | Marketing Skills (Corey Haines and community) | Claude Code, with individual web skill packages also available |
| You want to know what people are discussing right now | Last30Days (community) | Claude Code, with web and desktop packages also offered |
| You have a draft full of formulaic phrasing | Humanizer (community) | Claude Code or custom skill upload |
| You want a landing-page concept to hand to a developer | Frontend Design skill (Anthropic) | Claude Code, or a custom skill route where supported |
Marketing and Data come from Anthropic’s knowledge-work plugins, and PowerPoint, Excel and Frontend Design come from its skills repository, so eight jobs do not mean eight installs. Without a terminal, begin with PowerPoint or Excel.
Skills, plugins and connectors, and what each gives Claude
Anthropic’s knowledge-work plugins keep these parts separate on purpose. That matters when a promising demo depends on data connections you have not set up. Connections like these are usually built on MCP, which we explain in our Cloudflare MCP guide.
To add a custom skill in Claude chat, go to Customize, then Skills, press +, choose Create skill and then Upload a skill. Turn on code execution and file creation first, because organisation policies can affect availability. Use the maintainer’s packaged download where one exists, not a ZIP of a whole multi-skill repository. Anthropic’s guides to using skills and creating custom skills cover the details.
Claude Code commands belong in Claude Code or your terminal. Pasting them into an ordinary Claude chat does not install a local plugin.
1. Anthropic PowerPoint for turning a brief into a deck
Anthropic’s PowerPoint skill creates, reads and edits presentations, which suits launch proposals, client updates and monthly reporting.
How to add it
In Claude chat, turn on code execution and file creation, then ask for a PowerPoint. Anthropic documents this as a built-in capability, so you do not need a GitHub download. For the repository’s Claude Code version, run these two commands.
/plugin marketplace add anthropics/skills/plugin install document-skills@anthropic-agent-skills
Try it
Create a six-slide campaign proposal from the attached brief and reporting workbook. Cover the audience problem, evidence, proposed approach, channel plan, budget and decision required. Use our supplied template and add source notes for numbers.
What to watch for
Open the file and check every slide for labels, overflow, chart values and whether each slide makes a clear point. The public repository version may differ from Claude’s hosted behaviour, and it may need local dependencies.
2. Anthropic Excel for a reusable reporting model
The Excel skill covers spreadsheet files, including cleaning tabular data, adding formulas, formatting, charts and building workbooks. Choose it when the file should stay useful after this week’s report.
How to add it
Claude chat provides spreadsheet capabilities once code execution and file creation are on. In Claude Code, the document-skills package from the PowerPoint section includes the repository’s Excel skill.
Try it
Build an editable campaign-budget workbook from these approved figures. Separate inputs from calculated cells. Calculate spend, qualified leads and cost per qualified lead by channel using formulas. Show missing values explicitly and document assumptions.
What to watch for
Blank, zero and unavailable mean different things, so ask Claude to keep those distinctions and explain the denominator of each rate. The skill’s public instructions require recalculation and formula error checks. That is good discipline, but a formula can calculate cleanly while pointing at the wrong range, so reconcile a few results against the original data.
3. Anthropic Marketing plugin for coordinating a campaign
Anthropic’s official Marketing plugin combines content drafting, campaign planning, brand review, competitive analysis and performance reporting. For a small team, the value is having related workflows in one package. Its README lists connectors for Slack, Canva, Figma, HubSpot, Amplitude, Notion, Ahrefs, SimilarWeb and Klaviyo, and each service needs its own setup.
How to add it
In Cowork, browse Anthropic’s plugin directory for Marketing. In a terminal with Claude Code installed, run these two commands.
claude plugin marketplace add anthropics/knowledge-work-pluginsclaude plugin install marketing@knowledge-work-plugins
Try it
Give it your product brief, audience, approved claims, budget and deadline, then ask for a plan.
Use the campaign-planning workflow to prepare a four-week webinar campaign for operations managers at mid-sized manufacturers. Use our attached brief. Include channel choices, weekly deliverables, owners and measurement. Flag missing inputs before setting targets.
The README documents commands such as /campaign-plan, /brand-review and /performance-report. Commands can carry the plugin name as a prefix, as in /data:write-query in the repository’s own examples, so the exact form can vary by host.
What to watch for
A coherent plan still needs real customer evidence and commercial constraints. Connected services need separate setup.
4. Anthropic Data Analyst for checking campaign numbers
Anthropic’s Data Analyst plugin supports data exploration, SQL, visualisation, dashboards and analysis validation. It suits questions that cut across campaign exports or warehouse tables.
How to add it
Find the Data plugin in Cowork’s plugin directory, or run these two commands in a Claude Code terminal.
claude plugin marketplace add anthropics/knowledge-work-pluginsclaude plugin install data@knowledge-work-plugins
A warehouse connection is optional. The README also supports uploaded CSV or Excel files and pasted query results.
Try it
Analyse these campaign exports. Check date ranges, currencies, duplicate rows and conversion definitions first. Compare cost per qualified lead by channel, show the calculations and flag where attribution prevents a fair comparison.
What to watch for
Agree what “qualified lead” means before comparing channels. Different attribution windows can produce a convincing chart with an invalid comparison, as in the Meta post-click attribution problem and a longer purchase journey hidden by cookie loss. Ask for a reconciliation back to the input totals.
5. Marketing Skills for choosing a specialist workflow
Corey Haines’s Marketing Skills collection covers conversion optimisation, copywriting, SEO, analytics and growth. It suits marketers who want to add one specific method to an agent they already use.
How to add it
With Node.js and npm available, first list the catalogue, then install the skills you want.
npx skills add coreyhaines31/marketingskills --listnpx skills add coreyhaines31/marketingskills -a claude-code --skill cro copywriting
For Claude chat, the project also publishes individual claude-web ZIP files as release assets. Upload the one you want through Customize, then Skills. The maintainer says live client upload and invocation behaviour have not been verified.
Try it
Use the conversion optimisation skill to review this landing page. Our intended visitor is a procurement manager; the conversion is a demo request. Rank recommendations by impact and effort. Separate observations from hypotheses that need testing.
What to watch for
Skills supply guidance. Optional integrations, credentials and local command-line tools need their own setup, and a recommendation is not evidence of higher conversion.
6. Last30Days for finding what people are discussing
Last30Days researches recent discussion across sources such as Reddit, X, YouTube and the web. For marketers, a good use is finding current questions, objections and vocabulary before writing a brief.
How to add it
One documented Claude Code route is this command.
npx skills add mvanhorn/last30days-skill -g -a claude-code
The maintainer also offers a .skill web download and platform-specific desktop extension bundles, so follow the instructions for your environment.
Try it in Claude Code
/last30days What frustrations are small-business owners discussing about email marketing software? Link to the original discussions, distinguish repeated themes from isolated comments, and identify questions for customer interviews.
What to watch for
Available sources depend on setup. Some work without credentials, while others need API keys, extra software or authorised browser access, and provider charges can apply. Public discussion gives you leads and language, not a representative survey of your customers.
7. Humanizer for editing an existing draft
Humanizer targets recurring patterns in AI-generated prose, such as staged introductions, inflated significance and repetitive sentence shapes. It helps when you already have a substantive draft that needs a closer edit.
How to add it
In an interactive Claude Code session, run these two commands.
/plugin marketplace add blader/humanizer/plugin install humanizer@humanizer
The README says this plugin route needs Claude Code 2.1.142 or newer and documents an alternative skills installer. It also provides a ZIP upload route for Claude chat.
Try it
For the plugin version, call it with /humanizer:humanizer.
Edit this product announcement using Humanizer. Preserve every factual claim, quotation and qualification. Use the attached writing sample for voice. Remove empty emphasis and repetitive phrasing, and explain changes that alter meaning.
What to watch for
Cleaner prose is not accurate prose. Check every change against the source, especially quotations, customer claims and any wording that implies firsthand experience.
8. Anthropic Frontend Design for a landing-page concept
Frontend Design gives Claude guidance on visual direction, typography and layout when building or reshaping an interface. A marketer working with a developer can use it to turn an approved campaign brief into a page concept. Our own look at five open resources for an AI website design workflow covers the testing side.
How to add it
In Claude Code, Anthropic’s repository offers the example-skills package.
/plugin marketplace add anthropics/skills/plugin install example-skills@anthropic-agent-skills
That installs a collection, not only Frontend Design. A standalone skill can instead use the filesystem setup described in Claude Code’s skills documentation.
Try it
Use Frontend Design to build a responsive webinar landing-page prototype from this approved copy. Follow our brand assets. Make the speaker credentials and registration action easy to find. Include mobile and keyboard states; label any placeholder integration.
What to watch for
A prototype still needs working form delivery, consent handling, an accessibility review and analytics checks before launch. Keep approved claims intact while you experiment with the look.
What each tool needs besides installation
| Tool | What you still supply | Setup or cost note |
|---|---|---|
| PowerPoint skill | Brief, reporting workbook and template | Code execution and file creation on in Claude chat |
| Excel skill | Approved figures and definitions for each rate | Code execution and file creation on, then manual checks of the formulas |
| Marketing plugin | Brief, audience, approved claims, budget and deadline | Each connected service needs separate setup |
| Data Analyst plugin | Campaign exports and an agreed definition of a qualified lead | A warehouse connection is optional |
| Marketing Skills | The page, audience and conversion goal you want reviewed | Node.js and npm for the documented route, plus any optional integrations and credentials |
| Last30Days | A clear research question and the sources you allow | Some sources need API keys or authorised browser access, and provider charges can apply |
| Humanizer | A substantive draft, a writing sample and the source material | The plugin route needs Claude Code 2.1.142 or newer |
| Frontend Design skill | Approved copy and brand assets | Forms, consent handling, accessibility review and analytics checks before launch |
Give one tool a real assignment
If you work only in Claude chat, start with the PowerPoint or Excel skill. If you plan campaigns and can use Cowork or Claude Code, start with the Marketing plugin. If the problem is trust in your numbers, start with the Data Analyst plugin and reconcile its output to the source.
Start with a task you can judge, such as reviewing one landing page, analysing one campaign export or preparing one proposal. Keep the input files and a copy of your usual output so you have something to compare.
Then measure the work that remains. Did you spend less time explaining the task? Were the recommendations more specific? Did the output keep your evidence? How much correction did it need? How much room to give a tool depends on what a mistake costs, which is the idea behind our mistake test for AI autonomy.
Before installing, check the publisher, recent changes and any scripts, credentials or service access the tool asks for. Free repositories do not make Claude usage, external APIs or connected services free. Limits matter too, as we saw when Claude hit its limit mid-project, and our coding agent pricing comparison shows how Claude Code stacks up against alternatives.
The extension worth keeping is the one that improves a recurring piece of work enough to earn a place in your process. That is easier to judge after one complete assignment than after installing a whole directory. For more to try, see 21 AI GitHub repositories to watch in November 2026.
Claude plugins and skills for marketers FAQ
What is the difference between a Claude skill and a plugin?
A skill packages instructions, and sometimes scripts or reference files, for one task. A plugin bundles several skills, commands and connections for a whole job.
Do I need Claude Code to use these tools?
Not for all of them. PowerPoint and Excel are built into Claude chat, and some skills can be uploaded there as ZIP files. The Marketing and Data plugins run in Cowork or Claude Code.
Do Claude plugins connect to my ad accounts?
Instructions alone do not. A connector supplies access to an outside service, and each one needs its own setup.
Are these Claude plugins and skills free?
The repositories are available to download, but Claude usage, external APIs and connected services can carry their own charges.
Which tool should a marketer try first?
Pick the one that matches a task you can judge, such as reviewing a landing page or analysing a campaign export, and give it one complete assignment before installing more.
Can I upload a whole GitHub repository as a skill?
Use the maintainer’s packaged download where one exists. Uploading a ZIP of an entire multi-skill repository is not the documented route.
Sources and reporting note
We reviewed Anthropic’s documentation and each project’s repository on 28 October 2026. Capabilities and installation routes are as documented by their maintainers. We have not installed or benchmarked these tools, and the example prompts are suggested workflows, not test results.