hertwill-sourcing

hertwill-sourcing is a skill for Claude Code, Codex from Hertwill/hw-mcp. It costs 123 tokens per session (2,560 once invoked), scanned A, original, MIT.

A product-sourcing playbook for AI agents using the Hertwill dropshipping catalogue. Dropshipping means selling products without keeping them in stock yourself; the supplier ships orders to customers.

In plain words
What is it for?
Use it to filter Hertwill products, assess whether they meet the playbook's margin and stock rules, and match products with store niches and seasons.
Why use it?
It gives the agent rules for checking margins, stock, European tax, shipping, pricing, niches, and seasonal timing before recommending products.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/hertwill/hw-mcp/skill
Any agent
npx skills add Hertwill/hw-mcp --skill skill
Clone the repo
git clone --depth 1 https://github.com/Hertwill/hw-mcp

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for hertwill-sourcing

README.md
[![agentmods](https://agentmods.dev/badge/skills/hertwill/hw-mcp/skill.svg)](https://agentmods.dev/skills/hertwill/hw-mcp/skill)
Your own site
<a href="https://agentmods.dev/skills/hertwill/hw-mcp/skill"><img src="https://agentmods.dev/badge/skills/hertwill/hw-mcp/skill.svg" alt="Measured on agentmods" height="20"></a>
Per session 123 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,560 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00123 $0.02560
Opus 5 $0.00062 $0.01280
Sonnet 5 $0.00025 $0.00512
Haiku 4.5 $0.00012 $0.00256

Measured 5d ago against content hash 7f531a029779, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

hertwill-sourcing scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skill/SKILL.md · 211 lines

How it starts

The opening of the file, as written. The whole thing — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Hertwill Sourcing Playbook

This Skill gives you the domain knowledge needed to source winning dropshipping products from the Hertwill catalog. It covers five areas: winner heuristics, EU shipping guidance, markup strategy, category-to-niche mapping with seasonal timing, and hard guardrails. Use the Hertwill MCP tools referenced throughout to execute each step.


1. Winner Heuristics

A "winner" is a product worth importing into a store. Apply these filters in order.

Margin Floor

The minimum gross margin after EU VAT and estimated ad spend is 60%.

  • EU VAT ranges from 20% to 27% depending on the member state. Always use the target country's actual rate.
  • Estimated ad spend (Meta/Google) typically runs 15-25% of retail price for cold-traffic dropshipping.
  • Never do mental math. Use calculate_margin with the product's cost, your intended retail price, the target VAT rate, and your ad-spend estimate. If the result is below 60%, the product fails the margin test -- raise the retail price or skip it.

Stock State

  • Never recommend out_of_stock products. Check via evaluate_product or get_product. If stock is out_of_stock, skip the product entirely.
  • Flag low stock with an explicit warning. The product may sell out before the store gains traction. Tell the user the risk.
  • Only in_stock products should be presented as confident winners.

Variant Count

  • Prefer products with 3 or more variants (size, color, style). More variants means more SKU surface on a listing, more keyword coverage, and higher average order value potential.
  • Single-variant products are acceptable but note the limitation: fewer upsell angles and less listing richness.

Seasonal Fit

  • Cross-reference the seasonal calendar in Section 5 before calling a product a winner. A summer product evaluated in October is a losing pick regardless of margin.
  • If the product is seasonal, confirm you are within or approaching the relevant season before recommending it.

Read the full file on GitHub · 211 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 211 lines · 123 tokens per session scan A 7f531a029779

Subscribe to this mod's changes

hertwill-sourcing is a skill published in the GitHub repository Hertwill/hw-mcp (5 stars, last pushed 1mo ago), licensed MIT. It adds 123 tokens to every session and 2,560 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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