ad-copy-writer
Generate ad copy variations for Google, Microsoft, Meta, LinkedIn, TikTok, Reddit, Snapchat and X Ads (plus Apple Search Ads…
@cognyaiInstall SkillMarketing
Skill
/subject-line-lab
Mine your actual subject-line history from your connected ESP (Klaviyo, Mailchimp, Rule, Get a Newsletter, Brevo, MailerLite, Salesforce Marketing Cloud, Symplify, Braze), find the patterns that work for YOUR list, and generate tuned candidates
Claude Code
$ npx -y skills add cognyai/claude-code-marketing-skills --skill subject-line-lab --agent claude-code
Codex
$ npx skills add cognyai/claude-code-marketing-skills --skill subject-line-lab -a codex -y
Cursor
$ npx skills add cognyai/claude-code-marketing-skills --skill subject-line-lab -a cursor -y
Gemini CLI
$ npx skills add cognyai/claude-code-marketing-skills --skill subject-line-lab -a gemini-cli -y
GitHub Copilot
$ npx skills add cognyai/claude-code-marketing-skills --skill subject-line-lab -a github-copilot -y
OpenCode
$ npx skills add cognyai/claude-code-marketing-skills --skill subject-line-lab -a opencode -y
Windsurf
$ npx skills add cognyai/claude-code-marketing-skills --skill subject-line-lab -a windsurf -y
SKILL.md
subject-line-lab.SKILL.mdname: subject-line-lab
description: Mine your actual subject-line history from your connected ESP (Klaviyo, Mailchimp, Rule, Get a Newsletter, Brevo, MailerLite, Salesforce Marketing Cloud, Symplify, Braze), find the patterns that work for YOUR list, and generate tuned candidates
version: "1.1.2"
author: Cogny AI
requires: cogny-mcp
platforms: [klaviyo, mailchimp, rule, get-a-newsletter, brevo, mailerlite, salesforce-marketing-cloud, symplify, braze]
user-invocable: true
argument-hint: "[campaign topic]"
allowed-tools:
# Cogny Cloud (aggregated) namespace
- mcp__cogny__refresh_mcp_discovery
- mcp__cogny__mcp__Klaviyo__list_profiles
- mcp__cogny__mcp__Klaviyo__get_profile
- mcp__cogny__mcp__Klaviyo__list_lists
- mcp__cogny__mcp__Klaviyo__get_list
- mcp__cogny__mcp__Klaviyo__get_list_profiles
- mcp__cogny__mcp__Klaviyo__list_segments
- mcp__cogny__mcp__Klaviyo__get_segment
- mcp__cogny__mcp__Klaviyo__list_campaigns
- mcp__cogny__mcp__Klaviyo__get_campaign
- mcp__cogny__mcp__Klaviyo__get_campaign_message
- mcp__cogny__mcp__Klaviyo__get_campaign_values_report
- mcp__cogny__mcp__Klaviyo__list_flows
- mcp__cogny__mcp__Klaviyo__get_flow
- mcp__cogny__mcp__Klaviyo__list_metrics
- mcp__cogny__mcp__Klaviyo__get_metric
- mcp__cogny__mcp__Klaviyo__list_events
- mcp__cogny__mcp__Klaviyo__list_templates
- mcp__cogny__mcp__Klaviyo__get_account
- mcp__cogny__mcp__Mailchimp__tool_get_account_info
- mcp__cogny__mcp__Mailchimp__tool_list_campaigns
- mcp__cogny__mcp__Mailchimp__tool_get_campaign
- mcp__cogny__mcp__Mailchimp__tool_get_campaign_content
- mcp__cogny__mcp__Mailchimp__tool_list_audiences
- mcp__cogny__mcp__Mailchimp__tool_get_audience
- mcp__cogny__mcp__Mailchimp__tool_list_members
- mcp__cogny__mcp__Mailchimp__tool_get_member
- mcp__cogny__mcp__Mailchimp__tool_get_member_tags
- mcp__cogny__mcp__Mailchimp__tool_list_segments
- mcp__cogny__mcp__Mailchimp__tool_get_segment
- mcp__cogny__mcp__Mailchimp__tool_list_templates
- mcp__cogny__mcp__Mailchimp__tool_get_template
- mcp__cogny__mcp__Mailchimp__tool_list_reports
- mcp__cogny__mcp__Mailchimp__tool_get_report
- mcp__cogny__mcp__Mailchimp__tool_get_report_click_details
- mcp__cogny__mcp__Mailchimp__tool_get_report_open_details
- mcp__cogny__mcp__Mailchimp__tool_get_report_unsubscribed
- mcp__cogny__mcp__Mailchimp__tool_list_automations
- mcp__cogny__mcp__Mailchimp__tool_get_automation
- mcp__cogny__mcp__Rule__tool_list_subscribers
- mcp__cogny__mcp__Rule__tool_get_subscriber
- mcp__cogny__mcp__Rule__tool_get_subscriber_fields
- mcp__cogny__mcp__Rule__tool_list_subscriber_tags
- mcp__cogny__mcp__Rule__tool_list_tags
- mcp__cogny__mcp__Rule__tool_get_tag
- mcp__cogny__mcp__Rule__tool_list_campaigns
- mcp__cogny__mcp__Rule__tool_get_campaign
- mcp__cogny__mcp__Rule__tool_get_campaign_statistics
- mcp__cogny__mcp__Rule__tool_list_templates
- mcp__cogny__mcp__Rule__tool_get_template
- mcp__cogny__mcp__Rule__tool_list_segments
- mcp__cogny__mcp__Rule__tool_list_customizations
- mcp__cogny__mcp__Rule__tool_get_customization
- mcp__cogny__mcp__Rule__tool_list_suppressions
- mcp__cogny__mcp__Rule__tool_list_preference_groups
- mcp__cogny__mcp__Rule__tool_get_subscriber_preferences
- mcp__cogny__mcp__Rule__tool_list_journeys
- mcp__cogny__mcp__Get_a_Newsletter__tool_list_contacts
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_contact
- mcp__cogny__mcp__Get_a_Newsletter__tool_list_lists
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_list
- mcp__cogny__mcp__Get_a_Newsletter__tool_list_drafts
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_draft
- mcp__cogny__mcp__Get_a_Newsletter__tool_list_sent
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_sent
- mcp__cogny__mcp__Get_a_Newsletter__tool_list_scheduled
- mcp__cogny__mcp__Get_a_Newsletter__tool_list_reports
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_report
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_bounces
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_opens
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_opens_aggregated
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_have_not_opened
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_clicks
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_link_clicks
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_unsubscriptions
- mcp__cogny__mcp__Get_a_Newsletter__tool_list_attributes
- mcp__cogny__mcp__Get_a_Newsletter__tool_list_subscriptions
- mcp__cogny__mcp__Get_a_Newsletter__tool_list_senders
- mcp__cogny__mcp__Get_a_Newsletter__tool_get_sender
# Newer ESPs: read tools only
- mcp__cogny__mcp__Brevo__list_email_campaigns
- mcp__cogny__mcp__Brevo__get_email_campaign
- mcp__cogny__mcp__MailerLite__list_campaigns
- mcp__cogny__mcp__MailerLite__get_campaign
- mcp__cogny__mcp__Salesforce_Marketing_Cloud__list_email_sends
- mcp__cogny__mcp__Symplify__get_campaign_overview
- mcp__cogny__mcp__Symplify__get_campaign_report
- mcp__cogny__mcp__Braze__braze_list_campaigns
- mcp__cogny__mcp__Braze__braze_get_campaign_details
- mcp__cogny__mcp__Braze__braze_get_campaign_analytics
- mcp__cogny__list_integrations
- mcp__cogny__create_finding
- mcp__cogny__create_ticket
- mcp__cogny__write_context_node
- mcp__cogny__read_context_node
# Cogny Solo / Lite (per-ESP direct) namespace
- mcp__klaviyo__*
- mcp__mailchimp__*
- mcp__rule__*
- mcp__get_a_newsletter__*
- Bash
- Read
- Write
Subject Line Lab
Stop A/B testing blind. This skill reads **your actual last 100+ sends**, finds the subject-line patterns that correlate with open rate on *your* list, and generates 20 tuned candidates for your next campaign.
**Requires:** Cogny MCP + a connected ESP (Klaviyo, Mailchimp, Rule, Get a Newsletter, Brevo, MailerLite, Salesforce Marketing Cloud, Symplify or Braze). [Sign up](https://cogny.com)
Usage
`/subject-line-lab` — mine patterns and g
Read more
name: subject-line-lab description: Mine your actual subject-line history from your connected ESP (Klaviyo, Mailchimp, Rule, Get a Newsletter, Brevo, MailerLite, Salesforce Marketing Cloud, Symplify, Braze), find the patterns that work for YOUR list, and generate tuned candidates version: "1.1.2" author: Cogny AI requires: cogny-mcp platforms: [klaviyo, mailchimp, rule, get-a-newsletter, brevo, mailerlite, salesforce-marketing-cloud, symplify, braze] user-invocable: true argument-hint: "[campaign topic]" allowed-tools: # Cogny Cloud (aggregated) namespace - mcp__cogny__refresh_mcp_discovery - mcp__cogny__mcp__Klaviyo__list_profiles - mcp__cogny__mcp__Klaviyo__get_profile - mcp__cogny__mcp__Klaviyo__list_lists - mcp__cogny__mcp__Klaviyo__get_list - mcp__cogny__mcp__Klaviyo__get_list_profiles - mcp__cogny__mcp__Klaviyo__list_segments - mcp__cogny__mcp__Klaviyo__get_segment - mcp__cogny__mcp__Klaviyo__list_campaigns - mcp__cogny__mcp__Klaviyo__get_campaign - mcp__cogny__mcp__Klaviyo__get_campaign_message - mcp__cogny__mcp__Klaviyo__get_campaign_values_report - mcp__cogny__mcp__Klaviyo__list_flows - mcp__cogny__mcp__Klaviyo__get_flow - mcp__cogny__mcp__Klaviyo__list_metrics - mcp__cogny__mcp__Klaviyo__get_metric - mcp__cogny__mcp__Klaviyo__list_events - mcp__cogny__mcp__Klaviyo__list_templates - mcp__cogny__mcp__Klaviyo__get_account - mcp__cogny__mcp__Mailchimp__tool_get_account_info - mcp__cogny__mcp__Mailchimp__tool_list_campaigns - mcp__cogny__mcp__Mailchimp__tool_get_campaign - mcp__cogny__mcp__Mailchimp__tool_get_campaign_content - mcp__cogny__mcp__Mailchimp__tool_list_audiences - mcp__cogny__mcp__Mailchimp__tool_get_audience - mcp__cogny__mcp__Mailchimp__tool_list_members - mcp__cogny__mcp__Mailchimp__tool_get_member - mcp__cogny__mcp__Mailchimp__tool_get_member_tags - mcp__cogny__mcp__Mailchimp__tool_list_segments - mcp__cogny__mcp__Mailchimp__tool_get_segment - mcp__cogny__mcp__Mailchimp__tool_list_templates - mcp__cogny__mcp__Mailchimp__tool_get_template - mcp__cogny__mcp__Mailchimp__tool_list_reports - mcp__cogny__mcp__Mailchimp__tool_get_report - mcp__cogny__mcp__Mailchimp__tool_get_report_click_details - mcp__cogny__mcp__Mailchimp__tool_get_report_open_details - mcp__cogny__mcp__Mailchimp__tool_get_report_unsubscribed - mcp__cogny__mcp__Mailchimp__tool_list_automations - mcp__cogny__mcp__Mailchimp__tool_get_automation - mcp__cogny__mcp__Rule__tool_list_subscribers - mcp__cogny__mcp__Rule__tool_get_subscriber - mcp__cogny__mcp__Rule__tool_get_subscriber_fields - mcp__cogny__mcp__Rule__tool_list_subscriber_tags - mcp__cogny__mcp__Rule__tool_list_tags - mcp__cogny__mcp__Rule__tool_get_tag - mcp__cogny__mcp__Rule__tool_list_campaigns - mcp__cogny__mcp__Rule__tool_get_campaign - mcp__cogny__mcp__Rule__tool_get_campaign_statistics - mcp__cogny__mcp__Rule__tool_list_templates - mcp__cogny__mcp__Rule__tool_get_template - mcp__cogny__mcp__Rule__tool_list_segments - mcp__cogny__mcp__Rule__tool_list_customizations - mcp__cogny__mcp__Rule__tool_get_customization - mcp__cogny__mcp__Rule__tool_list_suppressions - mcp__cogny__mcp__Rule__tool_list_preference_groups - mcp__cogny__mcp__Rule__tool_get_subscriber_preferences - mcp__cogny__mcp__Rule__tool_list_journeys - mcp__cogny__mcp__Get_a_Newsletter__tool_list_contacts - mcp__cogny__mcp__Get_a_Newsletter__tool_get_contact - mcp__cogny__mcp__Get_a_Newsletter__tool_list_lists - mcp__cogny__mcp__Get_a_Newsletter__tool_get_list - mcp__cogny__mcp__Get_a_Newsletter__tool_list_drafts - mcp__cogny__mcp__Get_a_Newsletter__tool_get_draft - mcp__cogny__mcp__Get_a_Newsletter__tool_list_sent - mcp__cogny__mcp__Get_a_Newsletter__tool_get_sent - mcp__cogny__mcp__Get_a_Newsletter__tool_list_scheduled - mcp__cogny__mcp__Get_a_Newsletter__tool_list_reports - mcp__cogny__mcp__Get_a_Newsletter__tool_get_report - mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_bounces - mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_opens - mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_opens_aggregated - mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_have_not_opened - mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_clicks - mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_link_clicks - mcp__cogny__mcp__Get_a_Newsletter__tool_get_report_unsubscriptions - mcp__cogny__mcp__Get_a_Newsletter__tool_list_attributes - mcp__cogny__mcp__Get_a_Newsletter__tool_list_subscriptions - mcp__cogny__mcp__Get_a_Newsletter__tool_list_senders - mcp__cogny__mcp__Get_a_Newsletter__tool_get_sender # Newer ESPs: read tools only - mcp__cogny__mcp__Brevo__list_email_campaigns - mcp__cogny__mcp__Brevo__get_email_campaign - mcp__cogny__mcp__MailerLite__list_campaigns - mcp__cogny__mcp__MailerLite__get_campaign - mcp__cogny__mcp__Salesforce_Marketing_Cloud__list_email_sends - mcp__cogny__mcp__Symplify__get_campaign_overview - mcp__cogny__mcp__Symplify__get_campaign_report - mcp__cogny__mcp__Braze__braze_list_campaigns - mcp__cogny__mcp__Braze__braze_get_campaign_details - mcp__cogny__mcp__Braze__braze_get_campaign_analytics - mcp__cogny__list_integrations - mcp__cogny__create_finding - mcp__cogny__create_ticket - mcp__cogny__write_context_node - mcp__cogny__read_context_node # Cogny Solo / Lite (per-ESP direct) namespace - mcp__klaviyo__* - mcp__mailchimp__* - mcp__rule__* - mcp__get_a_newsletter__* - Bash - Read - Write
Subject Line Lab
Stop A/B testing blind. This skill reads **your actual last 100+ sends**, finds the subject-line patterns that correlate with open rate on *your* list, and generates 20 tuned candidates for your next campaign.
**Requires:** Cogny MCP + a connected ESP (Klaviyo, Mailchimp, Rule, Get a Newsletter, Brevo, MailerLite, Salesforce Marketing Cloud, Symplify or Braze). [Sign up](https://cogny.com)
Usage
`/subject-line-lab` — mine patterns and g
Ships withclaude-code-marketing-skills
AI marketing skills for Claude Code, Cursor, Windsurf, and other AI coding tools. Audit SEO, analyze ads, research competitors, qualify leads — all from your terminal. Free skills need no account. Premium skills connect your real data for $9/mo.
11262 skills
Stars on GitHub
Momentum
- stars in total
- 112
Other skills on claude-code-marketing-skills.
@cognyaiInstall Skillad-kill-rules
Enforce a pre-declared evidence bar on every ad — after it spends enough, pause it if it misses (e.g. CTR < 1% or cost per lead…
@cognyaiInstall Skillbrand-kit
Build a portable brand-kit.json for the user's product — colors, typography, voice — that other skills (video, ad creative,…
@cognyaiInstall Skillbuying-triggers
Find accounts where something just happened that creates demand — funding, hiring, new locations, launches, rising ad engagement…
@cognyaiInstall Skillcampaign-ledger
Give every campaign an ID and carry it everywhere — allocate IDs, audit ad/email/UTM naming across Google, Meta, LinkedIn, Bing,…
@cognyaiInstall Skillclosed-lost-revival
Re-read every lost deal in your CRM (HubSpot, Pipedrive or Upsales; Salesforce via the CRM layer) with its calls, meetings and…
@cognyaiInstall SkillMore skills from other plugins.
Auto-invoked
ab-testing
When the user wants to plan, design, or implement an A/B test or experiment, or build a growth experimentation program. Also use…
@coreyhaines31Install Skillseo
Comprehensive SEO analysis for any website or business type. Full site audits, single-page analysis, technical SEO (crawlability,…
@agricidanielInstall Skillbrag
Turn the current project website into a short, polished, shareable launch video using Hyperframes. Use when someone says "/brag",…
@latent-spacesInstall Skillgeo-audit
Full website GEO+SEO audit with parallel subagent delegation. Orchestrates a comprehensive Generative Engine Optimization audit…
@zubair-trabzadaInstall SkillQuestions about subject-line-lab.
- Which coding agents can use subject-line-lab?
- subject-line-lab installs in Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and Windsurf with the skills CLI, using each agent's flag shown on this page. Flowy's auto-invocation, which fires a skill when your prompt matches, runs in Claude Code only.