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Claude Code Skills for GTM

Claude Code skills for GTM are instruction files that teach Claude Code how to run go-to-market tools correctly. This library has nine free skills for Instantly, HeyReach, Blitz, campaign analysis and TAM scoring, installable in two commands.

These are the Claude Code skills OneGTM runs every day to launch cold email, LinkedIn outreach, list building, and account scoring for clients. Most of them started as notes written after something broke in production, so they spend less time on what the vendor docs say and more on what the docs leave out. They are free and open source on GitHub.

Install in Claude Code

Add the marketplace, then install the plugin:

/plugin marketplace add OneGTM/gtm-skills
/plugin install gtm-skills@onegtm

Or copy the skills in by hand:

git clone https://github.com/OneGTM/gtm-skills.git
cp -R gtm-skills/skills/* ~/.claude/skills/
  • Each skill is a folder with a SKILL.md in the open Agent Skills format, so they also run in Claude Cowork and other runtimes that read SKILL.md files.
  • API keys come from environment variables like INSTANTLY_API_KEY and HEYREACH_API_KEY. Nothing is hardcoded.

The skills

Instantly API

instantly-api

Create, edit, pause, and analyze Instantly campaigns through the V2 API and MCP. Includes the variable preflight that blocks a send when a lead is missing a merge field, so nobody gets an email that opens with a blank.

  • Instantly
View Instantly API on GitHub

Instantly copywriter

instantly-copywriter

Campaign naming, a 2x2 thread structure, Instantly-native spintax, humanized copy rules, and lead variable mapping. It's the house style we use for every cold email campaign.

  • Instantly
View Instantly copywriter on GitHub

Instantly toggle

instantly-toggle

Pause or resume every campaign in an Instantly workspace with one request. Handy when a domain gets flagged at 11pm.

  • Instantly
View Instantly toggle on GitHub

HeyReach API

heyreach-api

The full HeyReach reference: the sequence node tree, single-brace variable syntax, status-gated edits, the 100-lead cap per call, and the workarounds for each.

  • HeyReach
  • LinkedIn
View HeyReach API on GitHub

HeyReach campaign creator

heyreach-campaign-creator

Turn a copy file into a live LinkedIn campaign: builds the connection request and DM sequence, discovers senders, and supports dry runs before anything goes out.

  • HeyReach
  • LinkedIn
View HeyReach campaign creator on GitHub

HeyReach toggle

heyreach-toggle

Pause or resume all HeyReach campaigns, including finished ones that HeyReach normally won't let you pause.

  • HeyReach
View HeyReach toggle on GitHub

Blitz API

blitz-api

Company, people, and job posting search on Blitz, plus the checks that catch a query that quietly filtered nothing. Unknown filter keys return 200 with all 66M companies, and this skill is how you notice.

  • Blitz
View Blitz API on GitHub

Campaign analyzer

campaign-analyzer

Reply rates by persona, signal, and copy pattern, with significance testing so you stop declaring a winner after 40 sends.

  • Instantly
  • Python
View Campaign analyzer on GitHub

TAM scoring analysis

scoring-analysis-and-distribution

Audit a Clay-style account scoring model against the real data, simulate new bands and weights, and spread out a score distribution where every account lands at 62%.

  • Clay
  • Python
View TAM scoring analysis on GitHub

What makes these different

  • They're built around silent failures. The worst GTM bugs return a 200. Instantly renders a blank merge field and sends anyway. HeyReach drops leads missing a first name without an error. Blitz ignores filter keys it doesn't recognize and returns its entire database. Each skill checks for the failures we have actually hit.
  • Worked examples from real client work. The scoring skill walks through ten versions of a real model, with names removed, including the version that looked best on paper and got rejected.
  • Opinionated copy rules. The copy skills ban em dashes and buzzwords, keep every email under 100 words, and require a concrete fact in each one. That's our house style, and you can fork it and change it.

Why we open-sourced them

  • GTM engineering is still a new job, and most of the useful knowledge sits in private Slack threads. Putting ours in public makes the whole field better at this, and it's the easiest way to show how we work.
  • If you want the system built for you instead, that's what Claude Code for GTM engagements are. We scope one workflow, build it with Claude Code against your real data, and hand you the repo.
  • Found a gotcha we missed or a vendor change that broke a skill? Open an issue and we'll fold it in.

GTM skills FAQ

What are Claude Code skills?
A skill is a folder with a SKILL.md file that teaches Claude Code how to do a specific job, like pushing leads into Instantly or auditing a scoring model. Claude loads a skill only when the task calls for it, so you can install dozens without cluttering every conversation.
How do I install the OneGTM GTM skills?
In Claude Code, run /plugin marketplace add OneGTM/gtm-skills and then /plugin install gtm-skills@onegtm. You can also clone the GitHub repo and copy the skills folder into ~/.claude/skills.
Are these GTM skills free?
Yes. The library is MIT licensed, so you can use it, fork it, and change it for your own team or clients. You still need your own API keys for tools like Instantly, HeyReach, and Blitz.
Do the skills work outside Claude Code?
Each skill follows the open Agent Skills format, so it also works in Claude Cowork and other agent runtimes that support SKILL.md files. The API recipes are plain Python and curl, which any agent can run.
Why would an agency give its skills away?
Most of what is in these files is hard-won knowledge about where GTM tools fail silently. Sharing it helps more teams ship clean outbound, and the teams that want the whole system built for them tend to call us.

Want these running inside your own GTM stack, wired to your CRM and data?

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