Open-source Claude Code skills for cold email infrastructure, lead sourcing, and copywriting. Built by GrowthEngineX from patterns across 1,000+ real B2B campaigns.
Each skill is a standalone SKILL.md file that gives Claude deep expertise in a specific cold outbound workflow. No API keys included — bring your own.
| Skill | What It Does | API Keys Needed |
|---|---|---|
| Cold Email Copy Grader | Grades your cold email campaigns 0-100. Scores copywriting, targeting, and personalization. Catches the AI personalization trap (71% poor rate). Rewrites bad copy. | None |
| Domain Setup: Dynadot + Zapmail | End-to-end domain setup — generate short names, check availability, purchase on Dynadot, switch nameservers, connect on Zapmail, create inboxes, export to your sending platform. | Dynadot, Zapmail |
| Google Maps Scraper | Scrape Google Maps for business listings by query + location. Returns name, address, phone, website, rating, reviews, coordinates. Includes 42K US zip code database for state/city-wide scrapes. | RapidAPI |
| Prospeo Full Export | Export your entire Prospeo people search to CSV — even searches over 25K results. Handles pagination, rate limiting, deduplication, and automatic state-by-state splitting. | Prospeo |
Copy the skill folder into your Claude Code skills directory:
# Clone the repo
git clone https://github.com/growthenginenowoslawski/coldoutboundskills.git
# Copy the skill you want
cp -r coldoutboundskills/skills/cold-email-copy-grader ~/.claude/skills/Claude Code will automatically detect skills in ~/.claude/skills/.
git clone https://github.com/growthenginenowoslawski/coldoutboundskills.git
cp -r coldoutboundskills/skills/* ~/.claude/skills/You can also copy the contents of any SKILL.md file directly into a system prompt for any LLM. The scoring methodology, API references, and workflows work independently of Claude Code. Copy the contents of SKILL.md into your system prompt and paste your campaign copy.
Paste your draft email sequences and targeting details. Get back a score, risk flags, benchmark comparisons, and full copywriting rewrites when your copy needs work.
What you get:
- Score (0-100) broken down by copywriting quality (40%), targeting (35%), and personalization (25%)
- Risk flags that catch the 15 most common anti-patterns
- Benchmark comparison against top-performing campaigns
- Full rewrites when your score is below 65
- Quick grade mode for a fast gut check
The most important finding: Generic AI personalization — where AI describes what the prospect's company does — has a 71% poor rate and performs 4x worse than no personalization at all. The skill catches this automatically.
No dependencies. No API keys, no database, no external tools. Everything runs from patterns baked into the skill.
See examples/before-and-after.md for a full worked example (score: 38 → 66).
Automates the entire cold email domain lifecycle:
- Generate short domain name candidates using prefix/suffix patterns
- Check availability via Dynadot API (batch 100 at a time)
- Purchase available domains on Dynadot
- Switch nameservers to Zapmail's DNS
- Connect domains on Zapmail
- Create inboxes (2 per domain)
- Export to your email sending platform (Smartlead, Instantly, and 14 others)
Includes onboarding for first-time users — walks you through getting API keys, storing them safely, and verifying access.
Requires your own API keys:
- Dynadot API key (for domain registration)
- Zapmail API key (for inbox provisioning)
Covers all the gotchas we learned from setting up 500+ domains: DNS propagation timing, batch failure retries, comma encoding bugs, provisioning wait times, and more.
A self-contained tool for scraping business listings from Google Maps. Give it a search query (e.g., "pizza restaurant") and a location (zip code, city, or state), and it returns structured data for every matching business.
Features:
- CLI tool and optional web app with CSV export
- Bundled database of 42,734 US zip codes with population data
- Search entire states or filter by minimum population
- Rate limiting, retries, and automatic deduplication
- Deployable to Railway, Render, Fly.io, or any Node.js host
Requires: A RapidAPI key with a subscription to the Maps Data API.
Extract your entire Prospeo people search to a CSV file. Build your search in Prospeo's web UI, describe the filters to Claude, and it pulls every single result via the API.
Features:
- Automatic pagination through all results
- State-by-state splitting for US searches over 25K results (bypasses the 25K API cap)
- Deduplication by LinkedIn URL across states
- Credit cost estimation before running
- Rate limiting and exponential backoff
Requires: A Prospeo API key with credits for the Search Person API.
Skills are markdown files that give Claude specialized knowledge and workflows. When you place a SKILL.md file in ~/.claude/skills/, Claude Code automatically loads it and can use that expertise in conversations.
Think of skills as reusable playbooks — they encode domain knowledge, API references, scoring rubrics, and step-by-step workflows that Claude can execute on demand.
Want to add a skill? Create a folder in skills/ with a SKILL.md file following this format:
---
name: skill-name
description: What the skill does and when to use it.
---
# Skill Name
[Instructions, API references, workflows, etc.]Open a PR and we'll review it.
MIT License. See LICENSE.
Built by GrowthEngineX. Data from real campaigns run across dozens of industries.