Cold Email Local Business
gmapsscraper/google-maps-agent-skills
Write hyper-personalized cold emails to local businesses using their Google Maps data (CSV).
A skill your agent uses 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.
Install Cold Email Verifier
$ npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Varnan-Tech/opendirectory cold-email-verifier --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/Varnan-Tech/opendirectory.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/cold-email-verifier .claude/skills/cold-email-verifier && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "cold-email-verifier" agent skill from https://github.com/Varnan-Tech/opendirectory/tree/main/skills/cold-email-verifier into .claude/skills/cold-email-verifier/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cold-email-verifier", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/Varnan-Tech/opendirectory/tree/main/skills/cold-email-verifierType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Varnan-Tech/opendirectory cold-email-verifier --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Varnan-Tech/opendirectory.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/cold-email-verifier .agents/skills/cold-email-verifier && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cold-email-verifier" agent skill from https://github.com/Varnan-Tech/opendirectory/tree/main/skills/cold-email-verifier into .agents/skills/cold-email-verifier/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cold-email-verifier", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Varnan-Tech/opendirectory cold-email-verifier --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Varnan-Tech/opendirectory.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/cold-email-verifier .cursor/skills/cold-email-verifier && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "cold-email-verifier" agent skill from https://github.com/Varnan-Tech/opendirectory/tree/main/skills/cold-email-verifier into .cursor/skills/cold-email-verifier/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cold-email-verifier", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/Varnan-Tech/opendirectory.git --path skills/cold-email-verifier--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Varnan-Tech/opendirectory cold-email-verifier --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Varnan-Tech/opendirectory.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/cold-email-verifier .gemini/skills/cold-email-verifier && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "cold-email-verifier" agent skill from https://github.com/Varnan-Tech/opendirectory/tree/main/skills/cold-email-verifier into .gemini/skills/cold-email-verifier/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cold-email-verifier", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install Varnan-Tech/opendirectory cold-email-verifierInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Varnan-Tech/opendirectory.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/cold-email-verifier .github/skills/cold-email-verifier && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "cold-email-verifier" agent skill from https://github.com/Varnan-Tech/opendirectory/tree/main/skills/cold-email-verifier into .github/skills/cold-email-verifier/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cold-email-verifier", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Varnan-Tech/opendirectory cold-email-verifier --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Varnan-Tech/opendirectory.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/cold-email-verifier .opencode/skills/cold-email-verifier && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "cold-email-verifier" agent skill from https://github.com/Varnan-Tech/opendirectory/tree/main/skills/cold-email-verifier into .opencode/skills/cold-email-verifier/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cold-email-verifier", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
cold-email-verifier- GitHub stars
- 674
- Used in
- 1 other repo
- Token cost
- ~810 tokens
- SKILL.md length
- 383 words
- Files
- 5 (incl. scripts)
- Skills in repo
- 61
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses 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.
- Works in 3 steps: ValidEmail.co API (Highly Recommended) → Reacher Open Source (Self-Hosted) → Reacher Local CLI (Not Recommended /…
- The user wants to verify cold emails
- SKILL.md covers Overview, The Email Guessing Engine, Verification Methods (Choose… and How to Execute, plus 1 more section
- Runs Python scripts from its folder; needs VALIDEMAIL_API_KEY
What it does
Cold Email Verifier is an agent skill from Varnan-Tech/opendirectory. 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.
Its SKILL.md is about 810 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts (for example `README.md` and `scripts/email_verifier.py`).
It sits in Sales & Support, covering Cold outreach and CSV and tabular files. The repository describes itself as: AI Agent Skills built for Founders who hate Marketing. The licence is MIT.
When your agent uses it
- The user wants to verify cold emails
- Enrich a lead list
- Autonomously guess email addresses from a CSV using ValidEmail.co
- The open-source Reacher engine
Example prompts
- “/cold-email-verifier”
Requirements
- Python 3
- Docker
- A credential in VALIDEMAIL_API_KEY
Workflow steps
3 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 62e437a. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
validemail.cogithub.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
VALIDEMAIL_API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Cold Email Verifier loads about 810 tokens when it runs. Until then it costs about 48 tokens; SKILL.md has 383 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
The full file from Varnan-Tech/opendirectory at commit 62e437a, republished under its MIT licence (© Varnan-Tech). 383 words, ~810 tokens.
Download SKILL.mdSave it as
.claude/skills/cold-email-verifier/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- cold-email-verifier
- description
- 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.
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:
- Look up the company's official domain using the free Clearbit API.
- Clean the names (removing punctuation) and generate the 3 most common corporate email formats:
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.
- Free Tier: They offer a generous free tier (50 free verification credits on signup) to get you started!
- How to use: Go to validemail.co, create an account, get your API key, and run the script in --mode validemail.
2. Reacher Open Source (Self-Hosted)
If you want a 100% free, open-source solution, you can host the Reacher backend yourself on a cloud provider (like AWS, GCP, or Hetzner).
- GitHub Repo: reacherhq/check-if-email-exists
- Important: Your cloud provider MUST have outbound Port 25 open.
- How to use: Host the docker container, then run the script using --mode reacher-http --reacher-url "http://<YOUR_SERVER_IP>:8080/v0/check_email".
Show full SKILL.md (127 more words)Show less
3. Reacher Local CLI (Not Recommended / Unreliable)
You can run the Reacher CLI directly on your laptop.
- Warning: Residential ISPs globally block Port 25 to prevent spam. Furthermore, major mail servers (Microsoft, Google) will automatically reject SMTP handshakes from residential Wi-Fi IP addresses.
- Result: You will get massive amounts of false negatives and timeouts. Use ValidEmail.co instead.
How to Execute
First, ensure dependencies are installed: pip install -r requirements.txt
To use ValidEmail.co (Recommended):
ash export VALIDEMAIL_API_KEY="your_api_key_here" python scripts/email_verifier.py --input leads.csv --output verified_leads.csv --mode validemail
To use Self-Hosted Reacher:
ash python scripts/email_verifier.py --input leads.csv --output verified_leads.csv --mode reacher-http --reacher-url "http://your-server-ip:8080/v0/check_email"
CSV Format Requirements
The input CSV must contain these exact column headers (or their specific mappings):
- First Name
- Last Name
- Company Name
- Domain (Optional - highly recommended for accuracy)
© Varnan-Tech, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 4 other files (scripts) in skills/cold-email-verifier of Varnan-Tech/opendirectory.
- SKILL.md
- .env.example
- README.md
- requirements.txt
- scripts/email_verifier.py
Open the folder on GitHubat commit 62e437a
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in Varnan-Tech/opendirectory, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Cold Email Verifier next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Cold Email Verifier this skillVarnan-Tech/opendirectory | 674 | 1 repos | ~810 | Automated safety check: Pass | MIT | |
| Cold Email Local Businessgmapsscraper/google-maps-agent-skills | 132 | — | ~1.2k | Automated safety check: Pass | MIT | |
| Blitz List Buildergrowthenginenowoslawski/coldoutboundskills | 742 | — | ~2k | Automated safety check: Pass | MIT | |
| Disco Likegrowthenginenowoslawski/coldoutboundskills | 742 | — | ~1.7k | Automated safety check: Pass | MIT | |
| Google Maps List Buildergrowthenginenowoslawski/coldoutboundskills | 742 | — | ~6.2k | Automated safety check: Notes | MIT | |
| Cold Email Outreachgooseworks-ai/goose-skills | 1.2k | 1 repos | ~3.4k | Automated safety check: Notes | MIT |
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Google Maps List Builder
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Scrape Google Maps for local businesses by category and location, output CSV ready for cold email enrichment.
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End-to-end cold email outreach orchestration. An agent skill from gooseworks-ai/goose-skills.
- Official
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Questions about Cold Email Verifier
What does Cold Email Verifier do?
A skill your agent uses 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. Cold Email Verifier is an agent skill from Varnan-Tech/opendirectory.co or the open-source Reacher engine.
When should I use Cold Email Verifier?
Cold Email Verifier fits situations like: the user wants to verify cold emails; enrich a lead list; autonomously guess email addresses from a CSV using ValidEmail.co; the open-source Reacher engine.
How do I install Cold Email Verifier in Claude Code?
Run `npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier -a claude-code`. Or copy the skill folder (skills/cold-email-verifier in Varnan-Tech/opendirectory) into .claude/skills/cold-email-verifier in your project. Claude Code loads it when a task matches its description.
How do I install Cold Email Verifier in Codex?
Run `npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier -a codex`. Or copy the skill folder (skills/cold-email-verifier in Varnan-Tech/opendirectory) into .agents/skills/cold-email-verifier in your project. Codex loads it when a task matches its description.
Can I use Cold Email Verifier in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cold-email-verifier, .gemini/skills/cold-email-verifier, .github/skills/cold-email-verifier and .opencode/skills/cold-email-verifier in your project.
What does Cold Email Verifier need to run?
Going by SKILL.md and its folder, Cold Email Verifier needs Python for the scripts in its folder and credentials named VALIDEMAIL_API_KEY. Our summary lists: Python 3; Docker; A credential in VALIDEMAIL_API_KEY.
Does Cold Email Verifier access the network?
SKILL.md names 2 domains. As links in the text: validemail.co and github.com. This is read from the text; nothing was executed.
Is Cold Email Verifier safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Cold Email Verifier use?
Cold Email Verifier is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Cold Email Verifier use?
About 810 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Cold Email Verifier?
Skills that share tags, products or a category with Cold Email Verifier: Cold Email Local Business (gmapsscraper/google-maps-agent-skills, 132 stars), Blitz List Builder (growthenginenowoslawski/coldoutboundskills, 742 stars), Disco Like (growthenginenowoslawski/coldoutboundskills, 742 stars) and Google Maps List Builder (growthenginenowoslawski/coldoutboundskills, 742 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cold Email Verifier?
Varnan-Tech (a GitHub organization) maintains it in Varnan-Tech/opendirectory, which has 674 GitHub stars. The repository holds 61 skills in this directory. The repository was last updated on August 16, 2026.
Source: Varnan-Tech/opendirectory on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.