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Claude Code Skills

Guided AI Workflows for
Cold Email Infrastructure

MCP gives your AI the tools. Skills give it the expertise. Set up domains, create mailboxes, monitor warming, and troubleshoot deliverability — all with slash commands.

Install Skills View on GitHub
Open Source
6 Skills
Best Practices Built In
Works with MCP Server
Why Skills?

Tools vs. Expertise

The MCP server provides 36 individual API calls. Skills turn those into intelligent, multi-step workflows with cold email best practices built in.

MCP Server (the hands)

  • 36 individual API tools
  • Create one mailbox at a time
  • Check DNS record status
  • Enable warming per mailbox
  • Export to CSV format
  • Raw JSON responses

Skills (the brain)

  • Multi-step workflow orchestration
  • Domains + mailboxes + warming in one command
  • DNS diagnostic decision trees
  • Health scoring with traffic-light reports
  • Readiness checks before export
  • Cold email best practices at every step
Commands

Six slash commands, zero guesswork

Each command encodes the workflow and domain knowledge that takes cold email operators months to learn.

/winnr setup

Infrastructure Setup

Full provisioning wizard. Domain search and purchase, DNS verification, mailbox creation with professional naming, warming activation. One command, entire infrastructure.

/winnr health

Health Check

Traffic-light health report. Scores your infrastructure 0-100 across DNS health, warming performance, utilization, and mailbox diversity. Flags every issue.

/winnr troubleshoot

Diagnostics

Decision trees for DNS issues, warming problems, deliverability drops, and provisioning failures. Root cause analysis, not just error messages. Recovery steps with timelines.

/winnr scale

Scale Up / Down

Plan-aware scaling. Calculates domain-to-mailbox ratios, checks capacity, purchases domains, creates mailboxes, staggers warming for large batches. Or removes underperformers.

/winnr export

Export

15+ formats for every major sequencer: Smartlead, Instantly, Lemlist, Snov, and more. Runs a readiness check first — only exports mailboxes that are campaign-ready.

/winnr status

Quick Status

Instant account snapshot. Plan, domains used, mailboxes active, warming stats. One command, full picture. No report file — just the numbers you need.

In Action

50 mailboxes in one conversation

Here's what it looks like when you run /winnr setup in Claude Code.

You: /winnr setup — I need 50 mailboxes for cold outreach. My company is Revfront.
Claude: Let me check your account and plan capacity.
winnr_get_account → Enterprise plan, 200 mailbox limit
winnr_get_usage → 30 domains used, 120 mailboxes used
You have room for 80 more mailboxes and 10 more domains. I'll set up 13 new domains with 3-4 mailboxes each for 50 total. Let me find domains matching "revfront"...
winnr_suggest_domains → 20 suggestions
winnr_search_domains_bulk → 15 available
Available domains:
revfronthq.io ($3.99) · revfrontlabs.xyz ($1.99) · revfrontteam.co ($4.99) · tryrevfront.io ($3.99) · getrevfront.xyz ($1.99) · revfrontsends.email ($2.99) ... 13 selected, ~$38 total
You: Looks good, go ahead.
winnr_purchase_domains → 13 domains purchased, DNS setup queued
Waiting for DNS propagation...
winnr_get_dns_status → 13/13 domains fully verified
winnr_bulk_create_email_users → 50 mailboxes created
winnr_enable_warming → Warming enabled on all 50
Setup complete.
13 domains · 50 mailboxes · warming active
Monthly warming: $30 · Campaign-ready in ~14-21 days

Full report saved to WINNR-SETUP-REPORT.md
Install

Up and running in 3 steps

Get your API token, add the MCP server, install the skills. Done.

One-Liner
Manual
# Step 1: Add MCP server to Claude Code
claude mcp add winnr -- env WINNR_API_TOKEN=wnr_your_token uvx winnr-mcp

# Step 2: Install skills
curl -sL https://raw.githubusercontent.com/winnr-app/winnr-claude-skills/main/install.sh | bash

# Step 3: Verify
# Type "/winnr status" in Claude Code
# Step 1: Add MCP server
claude mcp add winnr -- env WINNR_API_TOKEN=wnr_your_token uvx winnr-mcp

# Step 2: Clone skills repo
git clone https://github.com/winnr-app/winnr-claude-skills.git

# Step 3: Copy skills to Claude Code
cp -r winnr-claude-skills/skills/* ~/.claude/skills/

# Step 4: Verify — type "/winnr status" in Claude Code
1

Get an API token

Sign up at app.winnr.app and create a token in Settings → API Tokens.

2

Add MCP + Skills

One command for the MCP server, one command for the skills. Takes about 30 seconds.

3

Start using commands

Type /winnr setup and let Claude handle the rest.

FAQ

Frequently asked questions

What are Claude Code skills?

Claude Code skills are slash commands that give Claude domain-specific expertise. Instead of calling raw API tools one by one, skills encode multi-step workflows, best practices, and diagnostic reasoning. Think of them as playbooks for Claude — they tell it what to do, in what order, and what to watch out for.

How are skills different from the MCP server?

The MCP server gives Claude 36 individual API tools (the hands). Skills give Claude cold email operational expertise (the brain) — workflow sequencing, best-practice ratios, diagnostic decision trees, and formatted reporting. You need both: the MCP server for API access, and skills for guided workflows. Set up the MCP server first.

Are skills free?

Yes. The skills are open source (MIT license) and free to install. You need a Winnr account (free tier available) and the winnr-mcp MCP server for the underlying API access.

Can I use skills without Claude Code?

Skills are designed for Claude Code specifically. If you use Claude Desktop, Cursor, or Windsurf, the MCP server alone gives you full API access — you just won't get the guided workflows and slash commands. The raw tools still work great.

What does /winnr setup actually do?

The setup wizard runs a 7-phase workflow: (1) check your account capacity, (2) generate domain suggestions based on your keyword, (3) purchase domains with your confirmation, (4) verify DNS propagation, (5) create mailboxes with professional first.last naming, (6) enable warming on all mailboxes, (7) generate a setup report with all credentials. Every step follows cold email best practices — 3-5 mailboxes per domain, avoiding spam-associated TLDs, conservative warming ramp-up.

What sequencer formats does /winnr export support?

15 formats: Smartlead, Instantly, Snov, SalesHandy, QuickMail, Lemlist, Woodpecker, Reply.io, Mailshake, GMass, Yesware, Mixmax, Outreach, Salesloft, and a generic default. The skill checks mailbox readiness before exporting — only campaign-ready mailboxes (14+ days warming, health score above 75, inbox rate above 85%) are included by default.

Give Claude cold email expertise

Open source skills. Free to install. Ready in 30 seconds.

Install Skills View on GitHub

MCP server docs · Read the launch post · API docs