cold-email-verifier SKILL.md skillA
cold-email-verifier from varnan-tech/opendirectory is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add varnan-tech/opendirectory/cold-email-verifier@git:20260418.3202b3dPins git:20260418.3202b3d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- varnan-tech/opendirectory
- Path
skills/cold-email-verifier/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260418.3202b3d, committed Apr 18, 2026
- Size
- 3,238 bytes
- Repository stars
- 688
- License
- MIT
Use when the user wants to verify cold emails, enrich a lead list, or autonomously guess email addresses from a CSV using ValidEmail.co or the open-source Reacher engine.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Cold Email Verifier and Guesser (Public) ## Overview This skill autonomously processes a CSV of leads (containing First Name, Last Name, and Company Name), discovers their corporate domain, generates professional email permutations, and strictly verifies their deliverability. It is designed to solve the problem of missing contact info by guessing core email angles and then checking which one is real. ## The Email Guessing Engine You don't need to provide emails in your CSV! If the CSV only contains First Name, Last Name, and Company Name, the script will automatically: 1. Look up the company's official domain using the free Clearbit API. 2. Clean the names (removing punctuation) and generate the 3 most common corporate email formats: - first@domain.com - first.last@domain.com - firstlast@domain.com ## Verification Methods (Choose Your Engine) Once the emails are guessed, the script must verify them. We support three methods: ### 1. ValidEmail.co API (Highly Recommended) **The absolute best option.** ValidEmail.co provides enterprise-grade accuracy, bypasses strict catch-all servers, and handles IP reputation for you. …
Read the whole file at its exact version.
How to install
mdr add varnan-tech/opendirectory/cold-email-verifier@sha256:73c882c9885576b7The line at the top of this page pins the label git:20260418.3202b3d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_a2rtnuevl3qezwsc)
6 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Apr 18, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3238 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
varnan-tech/opendirectory · 688 stars · license MIT · pushed 2026-10-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_a2rtnuevl3qezwsc GET https://markdownregistry.com/api/v1/resolve?ref=varnan-tech/opendirectory/cold-email-verifier GET https://markdownregistry.com/api/v1/blob/73c882c9885576b7b55bce07fde7c386b83bf780b52c6c772c7fa6d362a89de8
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.