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send-cold-email

Send cold email and run outbound email campaigns from an agent with Sendsets. Connect or check sending mailboxes, turn a lead list (CSV or inline) into a multi-step email sequence with follow-ups, validate merge fields, send a test, launch, and read and answer replies. Use when the user asks to send cold emails, email a list of prospects or leads, run an outreach or outbound sequence, or follow up with contacts by email.

plugins/AddisonHoff/sendsets/skills/send-cold-email/SKILL.md

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# Send cold email with Sendsets

Sendsets is a cold email API for agents. Work through the Sendsets MCP tools when they are connected (`list_mailboxes`, `create_campaign_draft`, `add_campaign_step`, `add_contact`, `start_campaign`, `list_threads`, `send_reply`, ...). Otherwise use the `sendsets` CLI with `--json`. Both act on the same workspace.

Not connected yet? Pick one:

- MCP: `claude mcp add --transport http sendsets https://api.sendsetsapi.com/v1/mcp` (OAuth sign-in in the browser; other clients use the same URL)
- CLI: install with `brew install addisonhoff/tap/sendsets` (macOS, Linux) or `scoop bucket add sendsets https://github.com/AddisonHoff/homebrew-tap` then `scoop install sendsets` (Windows). Without a package manager, download the archive for your platform and `checksums.txt` from https://github.com/AddisonHoff/sendsets-releases/releases/latest, check the archive against `checksums.txt`, and unpack the `sendsets` binary onto PATH. Then `sendsets login --hostname sendsetsapi.com` (it prints a code and URL for the user to approve) and `sendsets doctor --json`

A new workspace is free for up to 10 mailboxes: https://app.sendsetsapi.com/auth/register

## 1. Senders

`sendsets mailbox list --json`. With no mailbox, connect one: