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coreyhaines31/cold-email

coreyhaines31

cold-email

Write B2B cold emails and follow-up sequences that get replies. Use when the user wants to write cold outreach emails, prospecting emails, cold email campaigns, sales development emails, or SDR emails. Also use when the user mentions "cold outreach," "prospecting email," "outbound email," "email to leads," "reach out to prospects," "sales email," "follow-up email sequence," "nobody's replying to my emails," or "how do I write a cold email." Covers subject lines, opening lines, body copy, CTAs, personalization, and multi-touch follow-up sequences. For warm/lifecycle email sequences, see email-sequence. For sales collateral beyond emails, see sales-enablement.

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version:1.1.0
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v1.1Saved Apr 20, 2026

Cold 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-context.md exists (or .claude/product-marketing-context.md 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:

Use this data to inform your writing — not as a checklist to satisfy.


  • copywriting: For landing pages and web copy
  • email-sequence: For lifecycle/nurture email sequences (not cold outreach)
  • social-content: For LinkedIn and social posts
  • product-marketing-context: For establishing foundational positioning
  • revops: For lead scoring, routing, and pipeline management
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Overall Score

87/100

Grade

A

Excellent

Safety

92

Quality

89

Clarity

84

Completeness

82

Summary

The cold-email skill teaches AI agents to write B2B cold outreach emails and follow-up sequences that sound human and get replies. It provides copywriting frameworks, personalization strategies, subject line optimization, and follow-up cadence guidance backed by performance data and expert methods. The skill emphasizes peer-to-peer tone, ruthless brevity, and low-friction CTAs over sales templates.

Detected Capabilities

Copywriting framework selection (PAS, BAB, QVC, AIDA, PPP, Star-Story-Solution, SCQ, ACCA, Mouse Trap, Justin Michael Method, Vanilla Ice Cream, PASTOR)Subject line optimization (2-4 word, lowercase, internal-looking, no salesy language)Four-level personalization system (basic merge tags → industry → role-level → individual research signals)Follow-up sequence design (3-5 total emails, escalating gaps, angle rotation, breakup email)Tone calibration by audience seniority and industryQuality assurance checklist (human voice, every sentence earns its place, problem-connected personalization, low-friction CTA)Performance benchmarking (reply rates, open rates, conversion funnels, expert methods)Research signal identification (funding, hiring, tech stack, LinkedIn activity, company news)

Trigger Keywords

Phrases that MCP clients use to match this skill to user intent.

write cold emailprospecting email sequencecold outreachlow reply ratefollow-up emailsales developmentsubject line optimization

Risk Signals

INFO

References product-marketing-context.md file that may or may not exist in user's project

Before Writing section
INFO

Skill instructs agent to ask for prospect information (company, role, value prop, proof) but provides guidance for working with incomplete data

Before Writing → Understand the situation
INFO

No execution guardrails mentioned — skill is purely instructional/analytical, not operational

Overall structure

Use Cases

  • Write initial cold outreach emails to qualified prospects
  • Diagnose and rewrite low-performing cold emails
  • Build multi-touch follow-up sequences with angle rotation
  • Optimize subject lines for open and reply rates
  • Personalize at scale using research signals and triggers
  • Calibrate tone and structure for different audience seniority levels (C-suite, mid-level, technical)

Quality Notes

  • Excellent documentation: clear principles (peer tone, every sentence earns place, problem-connected personalization) with concrete examples and counter-examples
  • Strong reference architecture: 5 supporting markdown files provide deep contextual knowledge (frameworks, personalization, subject lines, follow-up cadence, benchmarks) without cluttering main skill
  • Comprehensive evals.json with 6 detailed test cases covering core use cases, edge cases (low performance diagnosis), related skill boundary (lifecycle email vs cold email), and casual phrasing triggers
  • Data-backed guidance: extensive performance benchmarks (reply rates, open rates, metrics by seniority/industry, declining trends) give agents and users decision-making context
  • Clear anti-pattern documentation: explicit 'What to Avoid' section lists jargon, filler phrases, high-friction CTAs, and fake personalization with rationales
  • Strong voice calibration: separate guidance for C-suite (ultra-brief), mid-level (specific value), and technical audiences (precise, no fluff)
  • Frameworks teach thinking patterns, not templates: each framework explained with structure, use case, and example rather than copy-paste shortcuts
  • Personalization depth: 4-level system with research signal matrix, fake-detection patterns, and 3-minute system for scaling personalization without losing quality
  • Follow-up strategy: optimal cadence table, angle rotation guidance, and breakup email structure address the 55% of replies coming from follow-ups
  • Subject line data is backed by large-scale studies (5.5M+ emails, 85M+ emails): 2-4 word lowercase wins decisively over common mistakes
  • Expert comparison table: indexes methods from 7 industry experts (Berman, Coleman, Holland, Allred, Michael, Nelson) with best-use scenarios, helping agents apply the right approach
  • Clear skill boundaries: explicitly defers lifecycle/nurture email sequences to email-sequence skill and sales collateral to sales-enablement skill
  • All supporting files present and well-linked in body text via [filename](references/filename.md)
Model: claude-haiku-4-5-20251001Analyzed: Apr 20, 2026

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Version History

v1.1

Content updated

2026-04-20

Latest
v1.0

No changelog

2026-04-19

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