Quick answer: for most catalogs, free covers it. Use Corey Haines’ marketingskills for the copy, jezweb/claude-skills (Shopify plugin) for CSV and store work, Anthropic’s brand-voice plugin for consistency, and blader/humanizer as a final pass. Run them over a CSV in batches of 20 to 50 rows, check the output with a script, then import. No paid pack we checked is product-description specific.
You have 400 SKUs, a supplier CSV full of manufacturer blurbs, and a store that reads like every other store selling the same products. Writing each description by hand takes weeks. Pasting rows into a chat window one at a time takes almost as long, and the results drift in tone by row 40.
Claude Code skills fix the second problem. A skill is a saved set of instructions Claude loads when the task matches, so row 400 follows the same rules as row 1. This guide covers the skills worth installing for product copy, which ones cost money, how to run them over a CSV or a Shopify catalog, and the rules (duplicate content, Product schema, Amazon listing policy) the skill has to respect.
Every star count and push date below came from the GitHub API on 2026-11-01. Every price came from the live product page on the same day.
What are Claude Code skills for product descriptions?
Direct answer: Claude Code skills for product descriptions are SKILL.md instruction folders that teach Claude how to write, check and format ecommerce copy. They live in ~/.claude/skills (all projects) or .claude/skills (one project), or arrive inside a plugin. Claude reads the skill’s description, loads it when you ask for product copy, and applies the same voice, length and format rules to every row.
A skill is different from a prompt you paste in. It persists, it can include reference files (your brand glossary, a banned-words list, a sample of approved descriptions), and it can include scripts. That last part matters for catalogs. A skill can tell Claude to read products.csv, write a new body_html column, and run a length check before saving.
For product copy, three types of skill do the work:
| Skill type | What it does | Example |
|---|---|---|
| Copywriting skill | Writes benefit-led copy from product facts | coreyhaines31/marketingskills copywriting |
| Platform skill | Knows Shopify fields, CSV columns, API calls | jezweb shopify-products, Shopify AI Toolkit |
| Guardrail skill | Checks voice, banned claims, AI tells | Anthropic brand-voice, blader humanizer |
You usually want one of each. The copywriting skill makes the words good. The platform skill puts them in the right field. The guardrail skill stops row 212 from claiming the kettle is “medical grade”.
If you are new to skills, start with what Claude Code skills are and how to install Claude Code skills.
Takeaway: treat a skill as a written style guide plus a checklist that Claude actually follows, and stack a writer, a platform skill and a guardrail.
The best free Claude Code skills for product descriptions
Direct answer: the strongest free options are coreyhaines31/marketingskills for the copy itself, jezweb/claude-skills for Shopify CSV and API work, Shopify’s official AI Toolkit for store access, Anthropic’s knowledge-work-plugins for brand voice, finsilabs/awesome-ecommerce-skills for catalog enrichment, and blader/humanizer for cleanup. All are on GitHub and cost nothing to install.
Here is each one with what it does and the install command from its README.
1. coreyhaines31/marketingskills (copywriting, copy-editing, schema)
- Source: github.com/coreyhaines31/marketingskills
- Price: free (open source)
- GitHub stats (2026-11-01): 57,803 stars, last push 2026-10-31
- What it does: a large marketing skill set. For product pages the useful ones are
copywriting(benefit-first copy),copy-editing(line edits),schema(structured data) andprogrammatic-seo(templated pages at scale). - Install:
npx skills add coreyhaines31/marketingskills --skill copywriting copy-editing schema(add-a claude-codeto target Claude Code only)
This is the best general writer in the free pool. It is not ecommerce specific, so pair it with a platform skill.
2. jezweb/claude-skills (shopify plugin)
- Source: github.com/jezweb/claude-skills
- Price: free
- GitHub stats: 1,094 stars, last push 2026-10-09
- What it does: the
shopifyplugin bundlesshopify-setup,shopify-productsandshopify-content. The products skill handles single products and bulk CSV import, and its own method table sends 20+ products to CSV import rather than API calls. The content skill covers pages, blogs and SEO metadata. - Install:
/plugin marketplace add jezweb/claude-skills, then/plugin install shopify@jezweb-skills
This is the most practical free option if your catalog lives in Shopify.
3. Shopify AI Toolkit (official)
- Source: github.com/Shopify/Shopify-AI-Toolkit, docs at shopify.dev/docs/apps/build/ai-toolkit
- Price: free
- GitHub stats: 621 stars, last push 2026-10-27
- What it does: per its README, gives the agent Shopify docs and API schema search, GraphQL and Liquid validation, and “store management through the CLI’s store execute capabilities”.
- Install:
claude plugin install shopify-ai-toolkit@claude-plugins-official
4. Anthropic brand-voice and marketing plugins
- Source: github.com/anthropics/knowledge-work-plugins
- Price: free
- GitHub stats: 34,325 stars, last push 2026-11-01
- What it does:
brand-voice(built by Tribe AI) has skills for brand discovery, guideline generation and brand-voice enforcement. Themarketingplugin includesdraft-content,content-creationandbrand-review. - Install:
claude plugin marketplace add anthropics/knowledge-work-plugins, thenclaude plugin install brand-voice@knowledge-work-plugins(swap inmarketingfor the second plugin)
5. finsilabs/awesome-ecommerce-skills (product-content-enrichment)
- Source: github.com/finsilabs/awesome-ecommerce-skills
- Price: free (MIT)
- GitHub stats: 61 stars, last push 2026-10-23
- What it does: 181 ecommerce skills.
product-content-enrichmentcovers generating descriptions, extracting attributes and tagging images for sparse supplier catalogs.ecommerce-seocovers store SEO. - Install: clone the repo and copy the folder, for example
cp -r awesome-ecommerce-skills/skills/catalog-inventory/product-content-enrichment your-project/.claude/skills/. The README also offerstessl installas an option.
The README claims skills lift output quality “from 66% to 96%” in Tessl evaluations. That is the vendor’s own test, not independently confirmed.
6. alirezarezvani/claude-skills (marketing-skills)
- Source: github.com/alirezarezvani/claude-skills
- Price: free
- GitHub stats: 29,110 stars, last push 2026-10-31
- What it does: a broad library. The
marketing-skillfolder includescopywriting,copy-editingandbrand-guidelines. - Install:
/plugin marketplace add alirezarezvani/claude-skills, then/plugin install marketing-skills@claude-code-skills
7. blader/humanizer
- Source: github.com/blader/humanizer
- Price: free
- GitHub stats: 63,282 stars, last push 2026-10-28
- What it does: flags and rewrites common AI writing patterns. Useful as a final pass so 400 descriptions do not all open with the same rhythm.
- Install:
/plugin marketplace add blader/humanizer, then/plugin install humanizer@humanizer(needs Claude Code 2.1.142+; older versions usenpx skills add blader/humanizer --global --agent claude-code)
More on this in skills for humanizing AI writing.
8. Directories worth browsing
ComposioHQ/awesome-claude-skills (78,504 stars, last push 2026-09-18) is the largest curated list. Marketplace directories such as claudemarketplaces.com and skills.sh index single-purpose skills like product-description-writer. Read any directory skill’s SKILL.md before you install it, because many have no maintainer activity.
Takeaway: marketingskills plus the jezweb Shopify plugin plus a humanizer pass covers most catalogs for $0.
Paid Claude Code skill packs for product copy
Direct answer: three paid packs had a public price on 2026-11-01: Inflectual’s Master Marketing Skills Bundle ($167 one-time, 167 skills), the Ultimate Claude SEO & AEO Skills Pack on Contra ($39, shown against $79), and SuperSkills ($50). None is product-description specific. You are paying for breadth and curation, not for an ecommerce feature the free repos lack.
Inflectual Master Marketing Skills Bundle
- Source: inflectual.gumroad.com/l/master-marketing-claude-skills-bundle
- Price: $167 one-time (page price meta: 167.0)
- What it does: 167 marketing skills split by category, including copywriting and messaging, content creation, SEO and email.
- Install: download from Gumroad and copy the skill folders into
~/.claude/skills. Install steps are not shown publicly, so check the download.
The Ultimate Claude SEO & AEO Skills Pack (Contra)
- Source: contra.com/products/fE9zVnna-the-ultimate-claude-seo-and-aeo-skills-pack
- Price: $39 (displayed against $79)
- What it does: SEO and AEO auditing, planning and writing. Relevant if your product pages need to rank and be cited, less so for raw description writing.
- Install: download and copy into your skills folder.
SuperSkills
- Source: superskills-one.vercel.app
- Price: $50 one-time
- What it does: a curated bundle of Claude Code skills across professional categories, marketing included.
- Install: download and copy into your skills folder.
What this list leaves out, and why
Claude Skills 360 lists a $39 one-time price, but its page carries a “Limited Time” discount banner with no end date, and the vendor’s blog ties the price to a user-count threshold nobody can check. That fails the no-fake-scarcity rule for this post. Several other packs found during research used countdown timers or “slots left” copy and were also dropped.
Takeaway: buy a paid pack only if you want a large organised library across marketing jobs. For product descriptions alone, the free stack is stronger because it includes Shopify-specific skills.
Free vs paid comparison table
Direct answer: free skills win on ecommerce specificity and transparency (you can read every line before installing). Paid packs win on volume and one-download convenience. No paid pack found in this research ships a Shopify or Amazon-specific workflow that a free repo lacks.
| Skill or pack | Price | Product copy | Shopify / CSV | Brand voice | Install method |
|---|---|---|---|---|---|
| coreyhaines31/marketingskills | Free | Strong | No | Partial | npx skills add |
| jezweb/claude-skills (shopify) | Free | Basic | Yes (API + CSV) | No | /plugin marketplace |
| Shopify AI Toolkit | Free | No | Yes (official) | No | claude plugin install |
| Anthropic brand-voice | Free | Via marketing plugin | No | Strong | claude plugin install |
| finsilabs product-content-enrichment | Free | Yes | Guidance | No | copy folder / tessl |
| alirezarezvani marketing-skills | Free | Yes | No | Yes | /plugin marketplace |
| blader/humanizer | Free | Cleanup | No | No | /plugin or npx skills add |
| Inflectual Master Marketing Bundle | $167 one-time | Yes | Not stated | Not stated | manual copy |
| Contra SEO & AEO Pack | $39 | SEO focus | Not stated | Not stated | manual copy |
| SuperSkills | $50 one-time | Yes | Not stated | Not stated | manual copy |
“Not stated” means the public sales page did not say. It does not mean the feature is missing.
How to write product descriptions at scale from a CSV or Shopify catalog
Direct answer: export your catalog to CSV, give Claude one skill that defines the voice and format, run it over the file in batches of 20 to 50 rows, write output to a new column, check length and banned claims with a script, spot-check a sample, then import. Never let a skill write straight to a live store on the first run.
Here is the workflow, step by step.
Step 1: get the data out
Shopify’s product CSV export includes Handle, Title, Body (HTML), Vendor, Type, Tags, variant columns, SEO Title and SEO Description. Export it from the admin, or let the jezweb shopify-products skill pull via the Admin API once shopify-setup has a token.
Step 2: write the facts column first
Descriptions are only as good as the inputs. Add a facts column with materials, dimensions, care, compatibility and the one reason someone buys this item. The finsilabs enrichment skill is built for the case where supplier data is thin.
Step 3: build a project skill
Create .claude/skills/product-descriptions/SKILL.md with:
- The voice (three to five rules, plus two approved examples)
- The structure (for example: one-line hook, three benefit bullets, specs, care)
- Length targets per field
- Banned claims (“best”, “cures”, unverified certifications)
- The output contract: write to
body_html_new, never overwriteBody (HTML)
See how to build a Claude Code skill for the folder layout.
Step 4: run in batches
Ask Claude to process rows 1 to 25, write the file, and stop. Review. Then continue. Batches make errors cheap to catch and keep each pass small.
Step 5: validate with a script
Add a short script to the skill that checks each row: character counts, banned words, duplicate opening sentences across rows, and that every spec in facts appears in the copy. Claude runs it and fixes failures before handing back the file.
Step 6: import, then publish in stages
Import the CSV back into Shopify as drafts or to a test collection first. Publish in stages so a bad batch does not hit the whole store.
| Catalog size | Method that fits |
|---|---|
| 1 to 20 products | Direct conversation or API via skill |
| 20 to 500 | CSV round trip in batches |
| 500+ | CSV batches plus script validation and staged publishing |
Takeaway: the skill controls quality, the script controls consistency, and the CSV round trip keeps a human between Claude and the live store.
Using the Shopify MCP with Claude Code
Direct answer: Shopify ships an official Dev MCP server and the AI Toolkit plugin. The Dev MCP is for developer docs and API schemas, not for writing copy. Install it with claude mcp add --transport stdio shopify-dev-mcp -- npx -y @shopify/dev-mcp@latest (verified on shopify.dev/docs/apps/build/devmcp), then restart Claude Code.
Why use it for product descriptions at all? Because the hard part of bulk updates is often the GraphQL mutation, not the prose. With the Dev MCP connected, Claude can look up the current productUpdate schema and validate the query before it runs, instead of guessing from training data.
The AI Toolkit plugin goes further: its README lists store management through Shopify CLI “store execute”. That means the agent can act on a store you have authenticated with, so treat it like giving a contractor admin access.
Safety rules for any store-connected setup:
- Use a development store or duplicate products first
- Keep the skill in “write to file” mode until you trust the output
- Log every mutation the agent runs
- Back up the product CSV before any bulk write
Shopify also has a separate Storefront MCP aimed at shopping agents. It is not covered here because it serves customers browsing a store, not merchants editing one.
Takeaway: connect Shopify’s MCP for correct API calls, keep copy generation in your own skill, and gate writes behind a review.
Avoiding duplicate content across hundreds of SKUs
Direct answer: duplicate product copy is mostly a ranking and clarity problem, not a penalty. Google says it rarely treats duplicate content as spam unless the intent is to manipulate results, but it will pick one version to show. If you sell variants or resell manufacturer copy, your page may not be the one chosen.
The three sources of duplication in catalogs:
- Manufacturer descriptions used by every reseller
- Variant pages (same shirt, six colours) with near-identical text
- Template copy where only the product name changes
How a skill helps:
| Problem | Skill rule |
|---|---|
| Manufacturer copy | ”Never reuse a sentence longer than 8 words from the supplier text” |
| Variants | Keep variants on one product URL; write one description, not six |
| Template sameness | ”Vary the opening structure; check no two rows share a first sentence” |
| Thin pages | Require at least one use-case or fit detail from facts |
The script check from the workflow section is what makes the “no shared first sentence” rule enforceable across 400 rows. A model asked nicely cannot see row 12 when writing row 380. A script can.
For variant URLs that must exist separately, use a canonical tag pointing to the main product. Shopify themes handle canonicals for variant parameters by default in most cases, but check your theme.
For deeper on-page work see Claude Code skills for SEO.
Takeaway: write unique copy for the canonical product, not for every variant, and use a script to catch repeats.
Product schema: what the skill should output
Direct answer: Product structured data tells Google the name, image, description, brand, price, availability and reviews of an item. Google’s Product structured data docs list the properties for product snippets and merchant listings. A skill can generate or check this JSON-LD for each row, but most Shopify themes already output it.
So the job is usually checking, not creating. Ask the skill to:
- Confirm the theme outputs
Productwithoffers(price,priceCurrency,availability) - Make sure the
descriptionin schema matches the visible copy - Flag any
aggregateRatingthat is not backed by real reviews on the page - Add
gtin,mpnorbrandfrom your CSV where the theme leaves them out
The schema skill in coreyhaines31/marketingskills is a reasonable base. Test the output with Google’s Rich Results Test before shipping.
One rule worth hard-coding: never let a skill invent review counts or ratings for schema. Google’s structured data policies require markup to reflect content visible on the page.
Takeaway: schema should mirror the page; a skill’s job is to keep the two in sync.
Amazon listing rules your skill must respect
Direct answer: Amazon applies a title policy across stores announced for January 2025: titles up to 200 characters including spaces, no promotional phrases, no special characters like !, $ or ? used decoratively, and no word repeated more than twice (with exceptions such as prepositions). Bullets are limited to five. Category style guides set the exact limits, so check yours in Seller Central.
Write these rules into an Amazon-specific skill or a reference file inside your product skill:
| Field | Rule to encode | Confidence |
|---|---|---|
| Title | 200 characters max incl. spaces; no promo words (“best seller”, “free shipping”) | Amazon policy, check category |
| Title | No repeated word more than twice | Amazon policy |
| Bullets | Up to 5; category guides often cite 255 characters or less each | Varies by category |
| Description | No contact info, URLs, pricing or time-sensitive claims | Amazon content policy |
| Backend search terms | Byte limit set in Seller Central | Check your account |
A 2026 SellerSprite article reports a stricter 75-character title limit from July 2026. That claim appears in one third-party source and is unconfirmed here. Check the Seller Central title requirements page for your marketplace before you rewrite anything.
Amazon copy and Shopify copy should differ. Amazon rewards scannable spec-led bullets. Your own store can carry voice, story and fit advice. One skill with two output modes (--amazon, --shopify) handles both from the same facts column.
Takeaway: keep Amazon rules in a reference file and have the validation script enforce them, because Seller Central rejects or suppresses listings that break them.
Keeping brand voice consistent across the catalog
Direct answer: brand voice drifts when the rules live in your head instead of the skill. Put three to five voice rules, a “we are / we are not” list, a glossary of approved product terms, and two approved sample descriptions inside the skill folder. Then run a voice check pass over the output.
Anthropic’s brand-voice plugin does exactly this split: one skill generates guidelines from your existing material, another enforces them on new content. If you already have a style guide, skip discovery and write the guideline file yourself.
What to include in voice.md:
- Reading level and sentence length (“short sentences, no sentence over 20 words”)
- Point of view (“second person, present tense”)
- Words you use (“tote”, never “bag” for the canvas range)
- Words you never use (your banned list, plus generic filler)
- Claims policy (what needs proof before it can appear)
Then the order of passes for each batch: write, voice check, humanizer, validation script. Four passes sounds slow, but Claude runs them in one request when the skill tells it to.
For more depth, read Claude Code skills for brand voice and Claude Code skills for copywriters.
Takeaway: voice is a file, not a feeling. Put it in the skill folder.
Common mistakes with AI product descriptions
Direct answer: the expensive mistakes are writing straight to a live store, letting the model invent specs, using one generic prompt for every category, and skipping review. Each one is fixable with a rule in the skill.
- Inventing specs. If
factsdoes not say “waterproof”, the copy must not. Encode: “Only state attributes present in the facts column.” - One prompt for every category. Candles and power tools need different structures. Use a category column and per-category sections in the skill.
- Overwriting the original. Always write to a new column so you can diff and roll back.
- Skipping SEO fields. Shopify’s
SEO TitleandSEO Descriptioncolumns are separate from the body. jezweb’s content skill notes titles under 60 characters and meta under 160. - No sampling. Read at least one row in ten from each batch before import.
- Claims compliance. Health, safety and environmental claims carry legal risk in many markets. The skill should flag these for human review, not write them.
See Claude Code skills for editing for review-pass skills.
Takeaway: most failures come from missing rules, so each mistake you find should become a new line in the skill.
FAQ
Can Claude Code write product descriptions?
Yes. Claude Code can read a CSV, write descriptions into a new column, and run checks on the output. A skill makes the format and voice repeatable across rows.
What is the best Claude Code skill for product descriptions?
For free use, pair coreyhaines31/marketingskills copywriting with the jezweb shopify plugin. There is no single skill that covers writing, Shopify import and brand voice together.
Are Claude Code skills free?
Most are. The GitHub repos in this guide are free. Paid packs exist, such as Inflectual ($167), the Contra SEO & AEO pack ($39) and SuperSkills ($50).
How do I install a Claude Code skill?
Use npx skills add owner/repo, a /plugin marketplace add plus /plugin install, or copy a SKILL.md folder into ~/.claude/skills. Each README in this guide gives the exact command.
Is there a Shopify MCP for Claude Code?
Yes. Shopify’s Dev MCP installs with claude mcp add --transport stdio shopify-dev-mcp -- npx -y @shopify/dev-mcp@latest. The Shopify AI Toolkit plugin adds store management via the Shopify CLI.
Can Claude Code update Shopify products directly?
With an Admin API token (jezweb shopify-setup) or the AI Toolkit’s store execute, yes. Start with a development store and a CSV round trip before allowing live writes.
Does Google penalize AI-written product descriptions?
Google’s guidance targets content made mainly to manipulate rankings, regardless of how it is produced. Helpful, accurate, unique descriptions are fine. Copied or mass-templated text tends to be filtered rather than penalized.
Is duplicate product content bad for SEO?
It usually means Google picks another site’s version to show. Write unique copy for each canonical product and keep variants on one URL.
Do I need Product schema on Shopify?
Most Shopify themes output it already. Check it with the Rich Results Test and make sure price, availability and description match the page.
How long should a product description be?
There is no fixed rule. Match the buying decision: a phone case needs less than a mattress. Set per-category length targets in your skill and test them.
Can one skill write for Amazon and Shopify?
Yes, with two output modes. Amazon needs policy-safe titles and five bullets. Your store can carry more voice and story from the same facts.
What is Amazon’s title character limit?
Amazon’s announced policy is 200 characters including spaces, with category exceptions. A reported 75-character limit from 2026 is unconfirmed here, so check Seller Central.
How do I stop AI descriptions sounding generic?
Feed real product facts, include approved examples in the skill, ban filler words, and run a humanizer pass. Generic input produces generic copy.
Can I use ChatGPT-style prompts as Claude Code skills?
You can paste a good prompt into a SKILL.md body. Add a clear description in the frontmatter so Claude knows when to load it.
How many products can Claude Code process at once?
It depends on row length and context. Batches of 20 to 50 rows keep review manageable. This is a working range, not a tested limit.
Sources and methodology
GitHub figures come from the GitHub API on 2026-11-01. Install commands were checked against each repo README on the same date. Prices were read from live product pages, including page price metadata where available.
- Shopify Dev MCP: https://shopify.dev/docs/apps/build/devmcp
- Shopify AI Toolkit: https://github.com/Shopify/Shopify-AI-Toolkit
- Google Product structured data: https://developers.google.com/search/docs/appearance/structured-data/product
- Amazon title requirements: https://sellercentral.amazon.com/help/hub/reference/external/GYTR6SYGFA5E3EQC
- Repos and paid pages: linked in each section above
No hands-on performance testing of these skills is claimed in this post.
Your next step
Pick one product category, export 25 rows, and build a project skill with your voice rules, a facts-only rule and an output column. Run it, read every row, and turn each problem you spot into a new rule. Then scale to the next category. For related workflows, see Claude Code skills for marketers, skills for landing page copy and skills for content writers.
