Growth work is a loop. You read the numbers, form a hypothesis, ship a change, and read the numbers again. Most of the time goes into the boring parts: pulling a funnel out of an analytics tool, writing a test plan nobody will argue with, and turning a drop-off into a page change.
Claude Code skills take over those boring parts. A skill is a folder with a SKILL.md file that teaches Claude one job, such as “design an A/B test” or “audit this signup flow”. Pair a few skills with an analytics MCP server and Claude can query the funnel, explain the leak, and draft the experiment in a single session.
This guide covers the skills and servers that do growth work, sorted by job: experimentation, funnel analysis, CRO, onboarding and activation, referral, analytics and growth loops. Every entry has its source, price (or “free”), what it does and the install command copied from its README. GitHub stars and last-push dates were pulled from the GitHub API on 1 November 2026.
New to skills? Read what Claude Code skills are first, then come back.
What are the best Claude Code skills for growth marketers?
Short answer: for most growth marketers, start with the free coreyhaines31/marketingskills repo (ab-testing, cro, signup, onboarding, referrals, analytics, marketing-loops), add one analytics MCP server for the tool you already use (GA4, PostHog, Mixpanel or Amplitude), and only then look at paid packs. That stack covers the whole experiment loop at no cost beyond your Claude plan.
Here is the full shortlist. Stars and dates are as of 1 November 2026.
| # | Skill or server | Type | Price | Best for | GitHub stars | Last push |
|---|---|---|---|---|---|---|
| 1 | coreyhaines31/marketingskills | Skill repo | Free | Experiments, CRO, activation, referral, loops | 57,803 | 2026-10-31 |
| 2 | alirezarezvani/claude-skills (marketing-skills plugin) | Plugin | Free | Form, popup, paywall and onboarding CRO | 29,110 | 2026-10-31 |
| 3 | anthropics/knowledge-work-plugins (marketing) | Official plugin | Free | Performance reports, campaign plans | 34,325 | 2026-11-01 |
| 4 | Google Analytics MCP | MCP server | Free | GA4 reports and realtime data | 3,611 | 2026-10-29 |
| 5 | PostHog MCP and AI plugin | MCP + plugin | Free to install; PostHog usage billing applies | Product analytics, flags, experiments | 97 | 2026-11-01 |
| 6 | Mixpanel MCP | MCP server | Free to install; Mixpanel plan limits apply | Funnels, retention, flows | n/a (hosted) | n/a |
| 7 | Amplitude MCP marketplace | MCP + plugin | Free to install; Amplitude plan applies | Charts, experiments, cohorts | 46 | 2026-10-31 |
| 8 | AgriciDaniel/claude-seo | Plugin | Free | Organic acquisition audits | 25,386 | 2026-11-01 |
| 9 | ComposioHQ/awesome-claude-skills | Directory | Free | Finding niche skills | 78,504 | 2026-09-18 |
| 10 | Inflectual Master Marketing Skills Bundle | Paid pack | $167 one-time | Breadth across marketing | n/a | n/a |
| 11 | SuperSkills | Paid pack | $50 one-time | General skill library | n/a | n/a |
| 12 | Ultimate Claude SEO & AEO Skills Pack | Paid pack | $39 (shown against $79) | SEO and AI search acquisition | n/a | n/a |
| 13 | ClaudeFast Growth Kit | Paid kit | Pricing not public | CRO and growth loops | n/a | n/a |
| 14 | Marketplace directories (claudemarketplaces.com, claudskills.com) | Directories | Free | Discovery | n/a | n/a |
Two filters shaped this list. First, each pick does a specific growth job, not “marketing in general”. Second, anything sold with countdown timers or fake “only 3 left” scarcity was left out. That is why Claude Skills 360 is not here.
Takeaway: one free repo plus one analytics server beats a stack of ten generic packs.
Experimentation and A/B testing skills
The best free experimentation skill is ab-testing from coreyhaines31/marketingskills. Its description says it handles planning, designing and implementing A/B tests, including building a growth experimentation program. alirezarezvani’s ab-test-setup is a solid second opinion. Both turn a vague idea (“try a shorter form”) into a written hypothesis, a primary metric, guardrail metrics and a sample-size question.
What a good experiment skill should produce
A test plan is only useful if your team would sign it. Check that the skill’s output includes:
- A hypothesis in “if we change X, metric Y moves because Z” form
- One primary metric and two or three guardrails (for example, refund rate)
- A minimum detectable effect and a rough duration based on your traffic
- A stopping rule written before launch, so nobody peeks and calls it early
- A note on what you will do if the result is flat
Install
npx skills add coreyhaines31/marketingskills --skill ab-testingOr the whole alirezarezvani marketing plugin, which includes ab-test-setup:
/plugin marketplace add alirezarezvani/claude-skills
/plugin install marketing-skills@claude-code-skillsWhere the skill stops
A skill writes the plan. It does not run the test or compute significance on live data by itself. For that you need the experiment tool, and that is where the MCP servers below come in. PostHog’s MCP covers feature flags and experiment management, and Amplitude’s docs list “create and query experiments” among its tools. Mixpanel’s MCP lists experiments and feature flags too.
If you run tests mostly on paid traffic, the planning logic overlaps with ad testing; see Claude Code skills for PPC.
Takeaway: use the skill for the plan, the vendor MCP for the data, and keep a human on the “ship or kill” call.
Funnel analysis: connecting Claude to GA4, PostHog, Mixpanel and Amplitude
Funnel analysis needs data, and skills do not ship data. The fix is an MCP server from your analytics vendor. All four big tools now publish one, verified on their docs pages on 1 November 2026. Once connected, you can ask Claude for the signup-to-activation funnel for last month, broken down by source, and get an answer from your own account.
Verified analytics servers
| Tool | Official source | Claude Code install | Notes from the docs |
|---|---|---|---|
| GA4 | googleanalytics/google-analytics-mcp | claude mcp add analytics-mcp --scope user -e "GOOGLE_APPLICATION_CREDENTIALS=..." -e "GOOGLE_CLOUD_PROJECT=..." -- pipx run analytics-mcp (see README for the full command) | Runs locally through pipx with Google Cloud credentials. Read-only by default; --allow-write enables write tools like annotations |
| PostHog | posthog.com/docs/model-context-protocol | npx @posthog/wizard mcp add or claude mcp add --transport http posthog https://mcp.posthog.com/mcp -s user | Covers analytics queries, SQL, feature flags, experiments and error tracking. Some tools use LLMs and can be billed as PostHog AI spend if AI processing is on |
| Mixpanel | docs.mixpanel.com/docs/mcp | claude mcp add --transport http mixpanel https://mcp.mixpanel.com/mcp | Insights, funnels, flows, retention, cohorts, experiments. EU and IN have separate URLs. 600 requests per hour per user. Older accounts need an admin to enable MCP |
| Amplitude | amplitude.com/docs/amplitude-ai/amplitude-mcp | /plugin marketplace add amplitude/mcp-marketplace then /plugin install amplitude@amplitude | Segmentation, funnels, retention, experiments, session replay search. Server URL https://mcp.amplitude.com/mcp |
PostHog also ships an official plugin. Its README gives claude plugin marketplace add PostHog/ai-plugin followed by claude plugin install posthog@posthog, then /mcp to log in.
A funnel prompt that works
Once a server is connected, be specific. “Analyse my funnel” gets you a generic answer. This gets a useful one:
Using Mixpanel, pull the funnel Sign Up > Created Project > Invited Teammate for the last 30 days, broken down by utm_source. Show conversion between each step, flag any source below the overall rate, and list three hypotheses for the biggest drop.
Pair that with the analytics skill from coreyhaines31 (it covers GA4, GTM, event tracking and UTM setup, per its description) so Claude checks whether the events are even tracked right before trusting the funnel.
Honest limits
- Mixpanel’s docs note
Run-Querycannot break down by cohort and does not work with Saved Metrics. - Amplitude’s MCP does not ingest event data; you still need an SDK.
- Your permissions carry over. If you cannot see a project in the app, Claude cannot either.
Takeaway: the MCP gives Claude your numbers; the skill gives it a method for reading them.
CRO skills for landing pages, signup and pricing
For conversion rate work, coreyhaines31’s cro skill covers marketing pages and forms (homepages, landing pages, pricing and lead capture), and signup covers registration and trial flows. alirezarezvani splits the same ground into narrower skills: page-cro, form-cro, signup-flow-cro, popup-cro and paywall-upgrade-cro. Choose the split version if you want tighter, single-purpose audits.
How to use a CRO skill well
CRO skills do best when you give them the page and the evidence together:
- Paste the live URL or the page HTML
- Add the funnel step data from your analytics MCP
- Add three to five real customer quotes from support tickets or reviews
- Ask for a ranked list of changes, each tied to an observed problem
Without data, any CRO skill falls back on best-practice checklists. Those are fine for a first pass, but they are not a diagnosis.
Free CRO skill map
| Job | coreyhaines31 skill | alirezarezvani skill |
|---|---|---|
| Landing and feature pages | cro | page-cro |
| Forms | cro | form-cro |
| Signup and trial | signup | signup-flow-cro |
| Popups and modals | popups | popup-cro |
| Paywalls and upgrades | paywalls | paywall-upgrade-cro |
| Pricing | pricing | pricing-strategy |
| Persuasion review | marketing-psychology | marketing-psychology |
Install just the CRO set from coreyhaines31:
npx skills add coreyhaines31/marketingskills --skill cro signup paywalls pricingThe --skill flag with multiple names comes straight from the repo README, which shows --skill cro copywriting as its example.
For the copy side of a page rewrite, see Claude Code skills for landing page copy.
Takeaway: a CRO skill is a structured second reviewer, and it is only as good as the data you hand it.
Onboarding and activation skills
For activation, the onboarding skill in coreyhaines31/marketingskills targets post-signup onboarding, activation rate, first-run experience, empty states and time-to-value, per its description. alirezarezvani’s onboarding-cro covers similar ground, and both repos have a churn-prevention skill for the other end of the lifecycle.
Activation is where growth and product meet, and it is the hardest step to fix with copy alone. A good onboarding skill will push you to define the “aha” action first. That is the one event that predicts a user sticks around. Only after that does it suggest checklists, tooltips or emails.
A workable activation workflow
- Define activation. Ask Claude, with your analytics MCP connected, which early event best separates retained users from churned ones in the last 90 days. Treat the answer as a hypothesis and check it with your data team.
- Map the path. Pull the funnel from signup to that event and find the slowest step.
- Audit the step. Run the
onboardingskill on screenshots or copy of that screen. - Write the nudge. Use an email skill for the lifecycle emails that support the in-app change. See Claude Code skills for email marketers.
- Test it. Hand the change to the
ab-testingskill for a plan.
What to watch for
Activation advice tends to repeat the same three ideas: progress bars, checklists and welcome emails. If the skill output sounds like that and nothing else, push back with your actual drop-off step. Product marketers working on the same surface may want Claude Code skills for product marketers.
Takeaway: define the aha event with data first, then let the skill work on the path to it.
Referral and growth loop skills
For referral programs, use coreyhaines31’s referrals skill (referral, affiliate, ambassador and word-of-mouth programs) or alirezarezvani’s referral-program. For growth loops, coreyhaines31’s marketing-loops is unusual: it sets up recurring workflows an agent runs on a cadence, not one-off tasks.
Referral: what the skill can and cannot design
A referral skill can draft the incentive structure (one-sided or two-sided), the share moments, the copy, and the tracking plan. It cannot tell you whether your product has a natural reason to share. If users get no value from bringing a colleague, no reward fixes that. Ask the skill to list the moments where a user already mentions your product to someone else. Build the referral ask there.
Growth loops vs funnels
A funnel is linear: traffic in, conversions out. A loop feeds itself: a new user’s action creates the next user’s entry point. Common loop types:
| Loop | Mechanism | Skill to start with |
|---|---|---|
| Viral / invite | Users invite teammates to get value | referrals |
| Content / SEO | User or company content ranks and brings visitors | programmatic-seo, claude-seo |
| Paid | Revenue funds more ads | ads, attribution |
| Product-led sharing | Outputs carry your brand (reports, links) | free-tools, launch |
Agent loops with marketing-loops
The marketing-loops skill describes “a repeatable loop an AI agent runs on a cadence (weekly, daily, on a trigger)”. In growth terms, that means a weekly job such as: pull last week’s funnel from the MCP, compare with the week before, flag any step that moved more than a set threshold, and draft one test idea. You run it with Claude Code’s scheduling or your own cron. The skill gives the structure; the trigger is yours.
For the organic side of loops, see Claude Code skills for SEO.
Takeaway: skills can design loops and run the weekly review, but the product has to give users a reason to loop.
Free vs paid Claude Code skills for growth marketers
Free options cover nearly every growth job in this guide. The paid packs I could verify sell breadth, meaning many skills across all of marketing, rather than deeper growth or experimentation tooling. Prices below were read on the live pages on 1 November 2026. The Inflectual price was confirmed through Gumroad’s product:price:amount meta tag (167.0 USD).
| Product | Where | Price | Growth coverage | Install |
|---|---|---|---|---|
| coreyhaines31/marketingskills | GitHub | Free | ab-testing, cro, signup, onboarding, referrals, analytics, attribution, marketing-loops, churn-prevention | npx skills add coreyhaines31/marketingskills or /plugin marketplace add coreyhaines31/marketingskills then /plugin install marketing-skills |
| alirezarezvani/claude-skills | GitHub | Free | ab-test-setup, page/form/signup/onboarding/paywall CRO, referral-program, campaign-analytics | /plugin install marketing-skills@claude-code-skills |
| Anthropic marketing plugin | GitHub | Free | performance-analytics skill, /performance-report command | claude plugin install marketing@knowledge-work-plugins |
| Vendor MCPs (GA4, PostHog, Mixpanel, Amplitude) | Vendor docs | Free to install; your analytics plan applies | Live funnels, retention, experiments | See the funnel section |
| Inflectual Master Marketing Skills Bundle | Gumroad | $167 one-time | Broad marketing library, per the listing | Download and copy into ~/.claude/skills |
| SuperSkills | Own site | $50 one-time | 139 general skills, per the site | Per vendor instructions |
| Ultimate Claude SEO & AEO Skills Pack | Contra | $39 (shown against $79) | Acquisition via SEO and AI search only | Per seller instructions |
| ClaudeFast Growth Kit | claudefa.st | Pricing not public | Vendor says 64 files covering CRO and growth loops (unconfirmed) | Per vendor |
When paying makes sense
- You want one vendor’s consistent format across a hundred skills and do not want to assemble repos.
- You need a specific skill the free repos lack, and the seller shows its contents before purchase.
When it does not
- Your bottleneck is data access. No pack fixes that; an MCP server does.
- The pack’s growth coverage is a few files inside a general bundle.
I did not buy or run the paid packs. Their contents above are as the sellers describe them.
Takeaway: start free, find the gap, then pay for that gap only.
How to install growth skills and keep them tidy
Install skills with npx skills add owner/repo (the Vercel skills CLI) or through Claude Code’s /plugin marketplaces. Skills land in ~/.claude/skills for all projects or .claude/skills for one project. MCP servers are added separately with claude mcp add. The full walkthrough is in how to install Claude Code skills.
A lean growth setup
# Skills: only the growth ones
npx skills add coreyhaines31/marketingskills --skill ab-testing cro signup onboarding referrals analytics attribution marketing-loops
# Analytics: pick the one you use
claude mcp add --transport http mixpanel https://mcp.mixpanel.com/mcpThen run /mcp inside Claude Code to finish the OAuth login for hosted servers.
Housekeeping rules
- Install per project when data differs. A client’s PostHog project should not sit in your global config. Agencies should read Claude Code skills for marketing agencies.
- Avoid duplicate skills. Installing both coreyhaines31 and alirezarezvani in full means two
copywritingskills and twoseo-auditskills. Claude may pick either one. Choose one repo per job. - Read every SKILL.md before trusting it. Skills are instructions Claude follows. A skill from an unknown author can tell Claude to run scripts.
- Keep write access off by default. The GA4 server is read-only unless you add
--allow-write. Amplitude write actions need a specific role permission. Keep it that way until you trust the workflow.
Want to write your own experiment template as a skill? See how to build a Claude Code skill. If you are not technical, Claude Code skills for non-developers covers the setup in plain steps.
Takeaway: fewer, well-chosen skills plus one data source make a cleaner system than a giant install.
Common mistakes growth marketers make with Claude Code skills
The most common mistake is asking a skill for growth answers without giving it growth data. The second is trusting a confident analysis that rests on broken tracking. Both are fixable in minutes.
- No data connection. Without an MCP, Claude guesses from best practice. Connect your analytics tool first.
- Skipping the tracking audit. Run the
analyticsskill before any funnel read. A missing event looks the same as a 100% drop. - Letting Claude call the test. Significance and business judgement stay with you. Ask Claude to show its working and the raw numbers.
- Installing everything. Overlapping skills confuse which one triggers. Install by job.
- Ignoring cost of tools. PostHog notes some MCP tools can be billed as AI spend, and Mixpanel caps requests per hour. Check before scheduling a daily loop.
- Sharing customer data carelessly. Session replays and user profiles may contain personal data. Check your company’s AI policy before connecting them.
- Buying a pack for a data problem. Paid breadth does not fix missing events.
Takeaway: data first, method second, judgement always yours.
FAQ
What are Claude Code skills?
Folders containing a SKILL.md file with instructions for one task. Claude loads a skill automatically when your request matches its description. More in what are Claude Code skills.
Are there Claude Code skills specifically for growth marketing?
Yes. coreyhaines31/marketingskills includes ab-testing, cro, signup, onboarding, referrals, analytics, attribution and marketing-loops. alirezarezvani/claude-skills has a 43-skill marketing plugin with several CRO skills.
Can Claude Code connect to GA4?
Yes, through Google’s official analytics-mcp server. It runs locally via pipx and needs Google Cloud credentials. It is read-only unless you add --allow-write.
Is there a PostHog MCP for Claude Code?
Yes. PostHog’s docs give npx @posthog/wizard mcp add or a direct claude mcp add to https://mcp.posthog.com/mcp. The older PostHog/mcp GitHub repo is archived, so use the docs instead.
Does Mixpanel have an MCP server?
Yes, hosted at https://mcp.mixpanel.com/mcp with EU and IN variants. It supports funnels, retention, flows, experiments and more, capped at 600 requests per hour per user.
Does Amplitude work with Claude Code?
Yes. Amplitude publishes an MCP server and a plugin marketplace: /plugin marketplace add amplitude/mcp-marketplace, then /plugin install amplitude@amplitude.
Can Claude Code run A/B tests?
It can plan them with a skill and, through PostHog, Mixpanel or Amplitude MCPs, create or query experiments where those tools allow it. Decisions on results should stay with a person.
Are free skills good enough, or should I buy a pack?
For growth work, free repos cover the core jobs. Paid packs mainly add breadth. Buy only to fill a gap you have found.
How much do paid Claude skill packs cost?
Of the packs checked on 1 November 2026: Inflectual’s bundle is $167, SuperSkills is $50, and the Contra SEO and AEO pack is $39. ClaudeFast’s Growth Kit pricing is not public.
Do I need to code to use these skills?
No. Installing takes one command, and you talk to Claude in plain English. Connecting GA4 is the most technical step because it needs Google Cloud credentials.
Can skills analyse funnel drop-off on their own?
Not without data. A skill gives Claude a method. An MCP server or an exported CSV gives it the numbers.
Is it safe to install skills from GitHub?
Read the SKILL.md and any scripts first. Prefer repos with recent activity and an author you can identify. Stars show popularity, not safety.
Which skill helps with user activation?
The onboarding skill in coreyhaines31/marketingskills, or onboarding-cro in alirezarezvani/claude-skills.
Can Claude Code run a weekly growth review automatically?
Yes, with the marketing-loops skill for structure plus a scheduler or cron job for the trigger. Watch your analytics tool’s API limits.
Where can I find more growth skills?
Directories such as claudemarketplaces.com and claudskills.com list growth categories, and ComposioHQ/awesome-claude-skills is a large curated list. Check each listing’s source repo before installing.
Sources and methodology
- GitHub stars and last-push dates:
gh api repos/OWNER/REPO, 1 November 2026. - Skill names and descriptions: each repo’s
skills/folder and SKILL.md frontmatter, same day. - Install commands: copied from each README or official docs page (coreyhaines31, alirezarezvani, anthropics/knowledge-work-plugins, googleanalytics/google-analytics-mcp, PostHog/ai-plugin, posthog.com, docs.mixpanel.com, amplitude.com).
- Prices: live product pages. Inflectual via Gumroad’s price meta tag. ClaudeFast Growth Kit had no public price on the pages checked.
- Not tested: paid packs were not purchased. Outcomes from any skill depend on your data and are not claimed here.
Your next step
Pick the one funnel step that hurts most this month. Install the matching free skill, connect the analytics tool you already pay for, and ask Claude for three hypotheses with the data behind each. That is one afternoon of setup and gives you a working experiment loop.
For the wider marketing stack, read Claude Code skills for marketers. Founders running growth themselves should see Claude Code skills for founders.
