Systems Lab

Agent skill

send-cold-email

Send a cold email campaign or single message via the configured email provider (Instantly by default), optionally pre-drafting the sequence.

activeNeeds a keyActs undeclared251 words

Filed under Outbound email.

From Othmane-Khadri/YALC-the-GTM-operating-system · 61 skills · 290 · pushed 2026-08-20

What it does when it runs

Send a cold email campaign or single message via the configured email provider (Instantly by default), optionally pre-drafting the sequence. Use when the user says 'send a cold email to this list', 'fire the email sequence', 'launch the email campaign', 'send the drip sequence', or 'email these qualified leads'. Side-effecting — calls Instantly API and writes to local SQLite + Notion.

Read from the skill and the 1 file bundled beside it. A skill’s own description is written to be selected by an agent, so it describes the job and not the dependencies.

Keys and connectors you must supply
  • INSTANTLY_API_KEY
Hosts it reaches
No third-party host appears in the skill or its bundled files.
Tool permissions it declares
No allowed-tools in the frontmatter. It does act, so it runs under whatever permissions your session already grants.
Actions present in the files
shell

Ask about send-cold-email

Opens your assistant with this page's verified links already in the prompt.

Is this safe to install?ClaudeChatGPT
Adapt it to my stackClaudeChatGPT
What else do I need for it to workClaudeChatGPT
Rather ask a human? Talk to Cheetah

Install it

View source on GitHub ↗
git clone --depth 1 --filter=blob:none --sparse https://github.com/Othmane-Khadri/YALC-the-GTM-operating-system.git /tmp/YALC-the-GTM-operating-system
git -C /tmp/YALC-the-GTM-operating-system sparse-checkout set ".claude/skills/send-cold-email"
mkdir -p ~/.claude/skills/send-cold-email
cp -R "/tmp/YALC-the-GTM-operating-system/.claude/skills/send-cold-email/." ~/.claude/skills/send-cold-email/

Picked up without a restart. A project skill of the same name is shadowed by your personal one. For one repository only, swap ~/.claude/skills for .claude/skills. Claude Code docs ↗

The folder is the same in every client that implements the format — 46 of them — so if yours is not above, only the destination changes.

Before you install: this skill will not complete its job on a bare agent. It needs INSTANTLY_API_KEY, which you have to obtain separately.

The skill

Source on GitHub ↗

Reproduced in full from Othmane-Khadri/YALC-the-GTM-operating-system/blob/5686d1f2f526346133f78eef3349fc5a655757b4/.claude/skills/send-cold-email/SKILL.md, which is licensed MIT (repository). 251 words, 10 headings.

Send Cold Email

I'll wrap two CLIs — email:create-sequence (drafts the sequence) and email:send (fires it). Both side-effecting → both shell-out.

When This Skill Applies

  • "send a cold email to this list"
  • "fire the email sequence"
  • "launch the email campaign"
  • "send the drip sequence"
  • "email these qualified leads"

NOT this skill (use launch-linkedin-campaign instead):

  • "launch a LinkedIn campaign" — that's the connect+DM flow on LinkedIn.

NOT this skill (use personalize-message instead):

  • "personalize a single email" — single per-lead variant, not bulk send.

Workflow

Step 0 — Ask for inputs

"Which result set, what subject + intro, how many touches?"

Step 1 — Validate (result set exists, intro non-empty)

Step 2 — Shell out to email:create-sequence

npx tsx src/cli/index.ts email:create-sequence --result-set <id> --subject "<subject>" --intro "<intro>"

(Verify exact flags via --help.)

Step 3 — Render the drafted sequence + ask for approval

"Drafted N messages across M touches. Send? (yes / preview only / cancel)"

Step 4 — On yes, shell out to email:send

npx tsx src/cli/index.ts email:send --sequence-id <id>

Step 5 — Render send result + offer follow-ups

"Want me to (a) track replies via track-campaigns, (b) personalize follow-ups for hot replies?"

Notes

  • Requires INSTANTLY_API_KEY (or whatever email provider is configured).
  • Default cadence: day 0, day 3, day 7, day 14.
  • The CLI enforces sending limits per the user's email accounts (Instantly handles deliverability).

Files bundled with it

These load only when the skill asks for them, so they cost nothing until it runs.

Other skills for the same job

Different authors, same problem. Matched on the words in the skill name, across every library in the catalogue except this one.

Need help setting it up?

This page tells you what send-cold-email does and what it needs. Cheetah builds the agent setup it runs inside: data, CRM, sequencing and the guardrails.

Book a call →

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