coreyhaines31/marketingskills · skills/free-tools/SKILL.md

free-tools skillA

free-tools is agent-read markdown (skill) from coreyhaines31/marketingskills: When the user wants to plan, evaluate, or build a free tool for marketing purposes — lead generation, SEO value, or brand awareness. Also use when the user mentions "engineering as marketing," "free tool," "marketing tool," "calculator," "generator," "interactive tool," "lead gen tool," "build a tool for leads," "free resource," "ROI calculator," "grader tool," "audit tool," "should I build a free tool," or "tools for lead gen." Use this whenever someone wants to build something useful and give .

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add coreyhaines31/marketingskills/free-tools@v2.0.1
Exact content
mdr add coreyhaines31/marketingskills/free-tools@sha256:609158ee26c6005c

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_bgp2cbt6agjscksr.svg)](https://markdownregistry.com/a/art_bgp2cbt6agjscksr)

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Versions

versioncommittedcommitsizeaudit
v2.0.1 latest2026-08-23 324539a 7,240 BA view · diff
v2.0.02026-05-14 30f9b9a 5,942 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (7240 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

coreyhaines31/marketingskills · 47,562 stars · license MIT · pushed 2026-09-05 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_bgp2cbt6agjscksr
GET https://markdownregistry.com/api/v1/resolve?ref=coreyhaines31/marketingskills/free-tools
GET https://markdownregistry.com/api/v1/blob/609158ee26c6005cf6138635a1a8ac4928322651c82ba13584db19d610d61e6b