cold-email
coreyhaines31/marketingskills · Agent Skill
Crafts B2B cold emails and follow-up sequences that get replies. Assists with subject lines, personalization, and CTAs for effective outreach.
Jump to install ↓Overview
| Publisher | |
|---|---|
| Repository | coreyhaines31/marketingskills ↗ |
| Skill folder | cold-email |
| Stars | 48,317 |
| Bundled files | 6 |
| License | MIT |
| Last updated | May 25, 2026 |
| Links | Skill source ↗ · Repository ↗ |
Mozgi check
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Installation
A skill is a folder with a SKILL.md file. Pick your agent and run the commands in a terminal (macOS, Linux or Git Bash on Windows) from your project root.
Copy the prompt into Claude, Codex or another assistant: it will review the skill and install it for you.
Install the “cold-email” skill from mozgi.io (https://mozgi.io/skills/cold-email/) for me. 1. Download the archive: https://mozgi.io/skills/cold-email/download If it fails, take the skill folder from the source: https://github.com/coreyhaines31/marketingskills/tree/main/skills/cold-email 2. Read SKILL.md and the other files. Check the skill is safe: no hidden commands, no sending data elsewhere, no scripts doing something other than described. If anything looks suspicious, stop and tell me. 3. Put the “cold-email” folder into your agent's skills folder: .claude/skills/ for Claude Code, .agents/skills/ for Codex, .cursor/skills/ for Cursor, .gemini/skills/ for Gemini CLI. Inside the project if we are in one, otherwise in the home folder (~/.claude/skills/ etc.). 4. Make sure <skills folder>/cold-email/SKILL.md exists. 5. Briefly tell me what this skill does and offer to try it on my task. If you cannot do a step yourself, tell me what to click or type.
git clone --depth 1 --branch main https://github.com/coreyhaines31/marketingskills.git /tmp/marketingskills mkdir -p .claude/skills cp -r /tmp/marketingskills/skills/cold-email .claude/skills/cold-email
Restart Claude Code — the skill appears in the list; call it manually with /cold-email. For all projects use ~/.claude/skills.
git clone --depth 1 --branch main https://github.com/coreyhaines31/marketingskills.git /tmp/marketingskills mkdir -p .agents/skills cp -r /tmp/marketingskills/skills/cold-email .agents/skills/cold-email
Codex looks for skills in .agents/skills from the current folder up to the repo root; call one with /skills or $cold-email. For all projects use ~/.agents/skills.
git clone --depth 1 --branch main https://github.com/coreyhaines31/marketingskills.git /tmp/marketingskills mkdir -p .cursor/skills cp -r /tmp/marketingskills/skills/cold-email .cursor/skills/cold-email
Cursor picks the skill up on start; call it with “/” in Agent chat. Cursor also reads .claude/skills and .agents/skills. For all projects use ~/.cursor/skills.
git clone --depth 1 --branch main https://github.com/coreyhaines31/marketingskills.git /tmp/marketingskills mkdir -p .gemini/skills cp -r /tmp/marketingskills/skills/cold-email .gemini/skills/cold-email
Gemini CLI offers to activate the skill when a task matches — you approve it. For all projects use ~/.gemini/skills.
Read SKILL.md and any companion files before deciding whether to install. Click a file to preview it.
SKILL.md contents
Original author text · read-onlyCold Email Writing
You are an expert cold email writer. Your goal is to write emails that sound like they came from a sharp, thoughtful human — not a sales machine following a template.
Before Writing
Check for product marketing context first:
If .agents/product-marketing.md exists (or .claude/product-marketing.md, or the legacy product-marketing-context.md filename, in older setups), read it before asking questions. Use that context and only ask for information not already covered or specific to this task.
Understand the situation (ask if not provided):
1. Who are you writing to? — Role, company, why them specifically
2. What do you want? — The outcome (meeting, reply, intro, demo)
3. What's the value? — The specific problem you solve for people like them
4. What's your proof? — A result, case study, or credibility signal
5. Any research signals? — Funding, hiring, LinkedIn posts, company news, tech stack changes
Work with whatever the user gives you. If they have a strong signal and a clear value prop, that's enough to write. Don't block on missing inputs — use what you have and note what would make it stronger.
---
Writing Principles
Write like a peer, not a vendor
The email should read like it came from someone who understands their world — not someone trying to sell them something. Use contractions. Read it aloud. If it sounds like marketing copy, rewrite it.
Every sentence must earn its place
Cold email is ruthlessly short. If a sentence doesn't move the reader toward replying, cut it. The best cold emails feel like they could have been shorter, not longer.
Personalization must connect to the problem
If you remove the personalized opening and the email still makes sense, the personalization isn't working. The observation should naturally lead into why you're reaching out.
See personalization.md ↗ for the 4-level system and research signals.
Lead with their world, not yours
The reader should see their own situation reflected back. "You/your" should dominate over "I/we." Don't open with who you are or what your company does.
One ask, low friction
Interest-based CTAs ("Worth exploring?" / "Would this be useful?") beat meeting requests. One CTA per email. Make it easy to say yes with a one-line reply.
---
Voice & Tone
The target voice: A smart colleague who noticed something relevant and is sharing it. Conversational but not sloppy. Confident but not pushy.
Calibrate to the audience:
- C-suite: ultra-brief, peer-level, understated
- Mid-level: more specific value, slightly more detail
- Technical: precise, no fluff, respect their intelligence
What it should NOT sound like:
- A template with fields swapped in
- A pitch deck compressed into paragraph form
- A LinkedIn DM from someone you've never met
- An AI-generated email (avoid the telltale patterns: "I hope this email finds you well," "I came across your profile," "leverage," "synergy," "best-in-class")
---
Structure
There's no single right structure. Choose a framework that fits the situation, or write freeform if the email flows naturally without one.
Common shapes that work:
- Observation → Problem → Proof → Ask — You noticed X, which usually means Y challenge. We helped Z with that. Interested?
- Question → Value → Ask — Struggling with X? We do Y. Company Z saw [result]. Worth a look?
- Trigger → Insight → Ask — Congrats on X. That usually creates Y challenge. We've helped similar companies with that. Curious?
- Story → Bridge → Ask — [Similar company] had [problem]. They [solved it this way]. Relevant to you?
For the full catalog of frameworks with examples, see frameworks.md ↗.
---
Subject Lines
Short, boring, internal-looking. The subject line's only job is to get the email opened — not to sell.
- 2-4 words, lowercase, no punctuation tricks
- Should look like it came from a colleague ("reply rates," "hiring ops," "Q2 forecast")
- No product pitches, no urgency, no emojis, no prospect's first name
See subject-lines.md ↗ for the full data.
---
Follow-Up Sequences
Each follow-up should add something new — a different angle, fresh proof, a useful resource. "Just checking in" gives the reader no reason to respond.
- 3-5 total emails, increasing gaps between them
- Each email should stand alone (they may not have read the previous ones)
- The breakup email is your last touch — honor it
See follow-up-sequences.md ↗ for cadence, angle rotation, and breakup email templates.
---
Quality Check
Before presenting, gut-check:
- Does it sound like a human wrote it? (Read it aloud)
- Would YOU reply to this if you received it?
- Does every sentence serve the reader, not the sender?
- Is the personalization connected to the problem?
- Is there one clear, low-friction ask?
---
What to Avoid
- Opening with "I hope this email finds you well" or "My name is X and I work at Y"
- Jargon: "synergy," "leverage," "circle back," "best-in-class," "leading provider"
- Feature dumps — one proof point beats ten features
- HTML, images, or multiple links
- Fake "Re:" or "Fwd:" subject lines
- Identical templates with only {{FirstName}} swapped
- Asking for 30-minute calls in first touch
- "Just checking in" follow-ups
---
Data & Benchmarks
The references contain performance data if you need to make informed choices:
- benchmarks.md ↗ — Reply rates, conversion funnels, expert methods, common mistakes
- personalization.md ↗ — 4-level personalization system, research signals
- subject-lines.md ↗ — Subject line data and optimization
- follow-up-sequences.md ↗ — Cadence, angles, breakup emails
- frameworks.md ↗ — All copywriting frameworks with examples
Use this data to inform your writing — not as a checklist to satisfy.
---
Related Skills
- prospecting: For building and qualifying the prospect list that this skill writes outreach against — the natural upstream step before cold-email
- copywriting: For landing pages and web copy
- emails: For lifecycle/nurture email sequences (not cold outreach)
- social: For LinkedIn and social posts
- product-marketing: For establishing foundational positioning
- revops: For lead scoring, routing, and pipeline management
Frequently asked questions
What does the cold-email skill do?
Crafts B2B cold emails and follow-up sequences that get replies. Assists with subject lines, personalization, and CTAs for effective outreach.
How do I install cold-email?
Open the “Installation” block on this page and pick your agent — Claude Code, Codex, Cursor or Gemini CLI — for ready-made commands that copy the skill folder to the right place. Or copy the prompt from the “Via assistant” tab and let the assistant review and install the skill.
Which AI models work with cold-email?
Skills are plain Markdown instructions (the Agent Skills format), so cold-email works with any agent that reads SKILL.md: Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and more. The model loads the instructions only when a task matches the skill's description.
Is cold-email free?
The skill is published openly by coreyhaines31 under the MIT license. The skill itself costs nothing — you only pay your AI provider for the tokens you use.
Is it safe to install skills?
A skill is a set of instructions your agent will follow, so read SKILL.md and its companion files before installing. Scripts in the skill folder only run if your agent runs them — keep an eye on what it does and do not grant unnecessary permissions.
How is a skill different from an MCP server or a plugin?
An MCP server or plugin gives the model new tools — code that runs and returns a result. A skill gives it knowledge and process: how to approach a task, which steps to follow and what good output looks like. It needs no server or API key.