cold-email
An agent skill by coreyhaines31, from coreyhaines31/marketingskills. Tags: automation, copywriting, email, prospecting, sales.
What it does
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 emails. For sales collateral beyond emails, see sales-enablement.
Install
With the skills CLI, which installs into Claude Code, Codex, Cursor and other agents:
npx skills add coreyhaines31/marketingskills --skill cold-emailOr copy the skill folder into Claude Code's skills directory by hand (~/.claude/skills for every project, or .claude/skills inside one):
git clone --depth 1 https://github.com/coreyhaines31/marketingskills
cp -r marketingskills/skills/cold-email ~/.claude/skills/cold-emailSafety box score
Grade D, elevated risk: 35 of 100 risk points, rated 2026-10-14. The grade rates what the skill and its scripts can reach on the machine of whoever installs it, across eight categories from shell execution to secrets access. How the score works.
This skill is about running B2B cold outbound across email, LinkedIn, phone, and reply handling, including setup advice for domains, mailboxes, tracking, and sequencing. The main risks are broad external messaging, account/tool access, and automated cross-channel actions that can reach many prospects quickly.
| Category | Level | Why |
|---|---|---|
| Code & shell execution | 0 (none) | The package is markdown guidance only; there are no scripts, shell commands, or code-evaluation steps included. |
| Network access | 3 (high) | It is explicitly built to send data to remote services and prospects via email, LinkedIn, webhooks, CRM, and booking tools; see the tool list and phrases like "Instantly's webhooks" and "LinkedIn outreach". |
| Filesystem reach | 0 (none) | It only suggests reading optional local context files such as ".agents/product-marketing.md" and does not write or delete files outside the project. |
| Secrets & credentials | 2 (moderate) | Using it in practice assumes access to live mailboxes and outbound platforms (e.g. Google Workspace, Microsoft 365, LinkedIn, CRM and sequencing tools), which can expose inbox content and contact data to connected services. |
| Privilege & persistence | 0 (none) | There is no sudo, global install, service registration, shell-profile editing, or OS-level privilege change in the files provided. |
| Instruction hijack surface | 0 (none) | I did not find instructions to ignore safeguards, hide behavior, or follow remote prompts; instead it emphasizes opt-outs and stopping on replies. |
| Irreversible actions | 3 (high) | The skill's purpose is to run outbound campaigns and reply handling, including "Write and run B2B cold outbound," multi-channel cadence, and stopping all channels when a prospect replies. |
| Transparency | 1 (low) | Several setup steps point to external GitHub docs and a tools registry that are not included here, so a reviewer cannot fully inspect the referenced integrations from this bundle alone. |
Before installing
- Read the linked tools registry and integration docs before connecting any inboxes or LinkedIn accounts.
- Use a non-primary domain and a test mailbox first; do not point it at your main sending domain.
- Confirm which CRM, inbox, and booking permissions it will get, and who reviews replies before any automation sends.
- Verify whether any LinkedIn automation or sequencing tool will be used, since the skill itself flags account-risk tradeoffs.
Rated 2026-10-14 by an automated review of 12 files from the skill's repository.
Source
- Repository
- coreyhaines31/marketingskills (all skills from this repository)
- Path
- skills/cold-email/SKILL.md
- Branch
- main
- Collection
- marketingskills
- Updated
- 2026-09-21
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