cold-email agent skill by coreyhaines31

At a glance

Before you install

Read from the skill's files at the directory's October 19, 2026 snapshot: what ships with it, what its code reads, and the terms it is published under.

• Bundled scripts: none.
• License: MIT, an open-source or open-content license.

Install cold-email

The skills CLI works with Claude Code, Codex, Cursor and other agents; the other routes copy the folder by hand.

npx skills add https://github.com/coreyhaines31/marketingskills/tree/main/skills/cold-email

tmp="$(mktemp -d)"
git clone --depth 1 https://github.com/coreyhaines31/marketingskills.git "$tmp/repo"
mkdir -p .claude/skills
cp -R "$tmp/repo/"skills/cold-email .claude/skills/
rm -rf "$tmp"

python3 ~/.codex/skills/.system/skill-installer/scripts/install-skill-from-github.py \
    --repo coreyhaines31/marketingskills \
    --path skills/cold-email

coreyhaines31/marketingskills is third-party code. Read SKILL.md and any bundled scripts before you install it.

How the author describes it

Write and run B2B cold outbound that gets replies, from cold emails and follow-ups to sending setup, LinkedIn, multichannel cadences, and reply handling. Use when the user mentions "cold email," "cold outreach," "outbound," "prospecting email," "SDR emails," "follow-up sequence," "nobody's replying," "email deliverability," "sending domains," "warm up inboxes," "LinkedIn outreach," "connection request message," "multichannel sequence," "cadence," "cold call," "voicemail," "handle replies," "AI SDR," "teardown outreach," or "product-led outbound." Send from secondary domains, verify lists first, turn off open tracking, and stop every channel when a prospect replies. Copy avoids AI tells like 'it's not X, it's Y' reveals. For building the list and account research, see prospecting. For lifecycle email, see emails. For call scripts and sales collateral, see sales-enablement.

From the description field of SKILL.md. Agents read this line to decide when to load the skill.

Sections in SKILL.md

• Before Writing
• Writing Principles
• Write like a peer, not a vendor
• Every sentence must earn its place
• Personalization must connect to the problem
• Lead with their world, not yours
• One ask, low friction
• Voice & Tone
• Structure
• Subject Lines
• Follow-Up Sequences
• Before You Send
• Beyond Email
• When They Reply
• Quality Check
• What to Avoid

Files in the skill folder

• SKILL.md
• evals/evals.json
• references/benchmarks.md
• references/deliverability.md
• references/follow-up-sequences.md
• references/frameworks.md
• references/linkedin-outreach.md
• references/multichannel-cadence.md
• references/outbound-plays.md
• references/personalization.md
• references/reply-handling.md
• references/subject-lines.md

Suede Skill Check: 88/100 · B

cold-email passes the required frontmatter check and all seven graded checks, which cover the SKILL.md format, a declared license and a commit in the last year. Those checks earn 56 of the score’s points; the rest come from description quality, instruction depth, bundled files, maintenance and curated-list citations. How the score works.

Where this skill is cited

coreyhaines31/marketingskills appears in 4 curated lists: BehiSecc/awesome-claude-skills, VoltAgent/awesome-agent-skills, heilcheng/awesome-agent-skills, karanb192/awesome-claude-skills.

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