Data Table Manager
n8n-io/n8n
Load before calling data-tables or parse-file. An agent skill from n8n-io/n8n.
Validate email addresses before campaign sending. An agent skill from extruct-ai/gtm-skills.
Install Email Verification
$ npx skills add extruct-ai/gtm-skills --skill email-verification -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install extruct-ai/gtm-skills email-verification --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/extruct-ai/gtm-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/email-verification .claude/skills/email-verification && 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 "email-verification" agent skill from https://github.com/extruct-ai/gtm-skills/tree/main/skills/email-verification into .claude/skills/email-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-verification", 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/extruct-ai/gtm-skills/tree/main/skills/email-verificationType 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 extruct-ai/gtm-skills --skill email-verification -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install extruct-ai/gtm-skills email-verification --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/extruct-ai/gtm-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/email-verification .agents/skills/email-verification && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "email-verification" agent skill from https://github.com/extruct-ai/gtm-skills/tree/main/skills/email-verification into .agents/skills/email-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-verification", 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 extruct-ai/gtm-skills --skill email-verification -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install extruct-ai/gtm-skills email-verification --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/extruct-ai/gtm-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/email-verification .cursor/skills/email-verification && 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 "email-verification" agent skill from https://github.com/extruct-ai/gtm-skills/tree/main/skills/email-verification into .cursor/skills/email-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-verification", 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/extruct-ai/gtm-skills.git --path skills/email-verification--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 extruct-ai/gtm-skills --skill email-verification -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install extruct-ai/gtm-skills email-verification --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/extruct-ai/gtm-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/email-verification .gemini/skills/email-verification && 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 "email-verification" agent skill from https://github.com/extruct-ai/gtm-skills/tree/main/skills/email-verification into .gemini/skills/email-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-verification", 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 extruct-ai/gtm-skills email-verificationInstalls 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 extruct-ai/gtm-skills --skill email-verification -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/extruct-ai/gtm-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/email-verification .github/skills/email-verification && 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 "email-verification" agent skill from https://github.com/extruct-ai/gtm-skills/tree/main/skills/email-verification into .github/skills/email-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-verification", 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 extruct-ai/gtm-skills --skill email-verification -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install extruct-ai/gtm-skills email-verification --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/extruct-ai/gtm-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/email-verification .opencode/skills/email-verification && 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 "email-verification" agent skill from https://github.com/extruct-ai/gtm-skills/tree/main/skills/email-verification into .opencode/skills/email-verification/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-verification", 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
email-verification- GitHub stars
- 109
- Token cost
- ~1.1k tokens
- SKILL.md length
- 536 words
- Files
- 1
- Skills in repo
- 20
- Repo updated
- First seen
- Licence
- None found
At a glance
Validate email addresses before campaign sending. An agent skill from extruct-ai/gtm-skills.
- Works in 7 steps: Confirm provider and learn API → Check API access and credits → Extract and deduplicate emails → …
- : verify emails
- SKILL.md covers Environment, Inputs, Workflow and Output, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Email Verification is an agent skill from extruct-ai/gtm-skills. Validate email addresses before campaign sending. Takes a contact CSV, validates each email via a verification provider, removes invalid/donotmail/abuse/catch-all/unknown addresses, and optionally cleans them from sequencer campaigns. Outputs a verified CSV ready for campaign-sending. Fits between email-generation and campaign-sending in the pipeline. Triggers on: "verify emails", "validate emails", "email verification", "clean emails", "check emails before sending", "remove bad emails", "email hygiene".
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Documents & Office, covering CSV and tabular files.
When your agent uses it
- : verify emails
- Validate emails
- Email verification
- Check emails before sending
Example prompts
- “verify emails”
- “validate emails”
- “email verification”
- “/email-verification”
Workflow steps
7 steps, taken from the step headings in SKILL.md.
- Confirm provider and learn API
- Check API access and credits
- Extract and deduplicate emails
- Validate emails
- Categorize and report
- Output cleaned CSV
- Clean from sequencer (optional)
What it can do on your machine
Read from SKILL.md and the folder at commit 34406cb. 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
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Email Verification loads about 1.1k tokens when it runs. Until then it costs about 133 tokens; SKILL.md has 536 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); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 536 words (~1,127 tokens).
“Validate emails before sending. Sits between email-generation and campaign-sending:”
- name
- email-verification
Files
Just SKILL.md in skills/email-verification of extruct-ai/gtm-skills.
Open the folder on GitHubat commit 34406cb
Compare with similar skills
Email Verification 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 |
|---|---|---|---|---|---|---|
| Email Verification this skillextruct-ai/gtm-skills | 109 | — | ~1.1k | Automated safety check: Pass | None | |
| Data Table Managern8n-io/n8n | 207k | — | ~2.3k | Automated safety check: Pass | Custom licence | |
| Instrument Data To Allotropeaws-samples/amazon-bedrock-agents-healthcare-lifesciences | 274 | 2 repos | ~2.7k | Automated safety check: Pass | Apache-2.0 | |
| Abuse Hunternexu-io/harness-engineering-guide | 663 | — | ~1.9k | Automated safety check: Pass | MIT | |
| Markitshift-labs-ai/markit | 1.3k | — | ~299 | Automated safety check: Pass | MIT | |
| Sector Analysttradermonty/claude-trading-skills | 3k | 1 repos | ~2.3k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Email Verification
What does Email Verification do?
Validate email addresses before campaign sending. An agent skill from extruct-ai/gtm-skills. Email Verification is an agent skill from extruct-ai/gtm-skills. Validate email addresses before campaign sending.
When should I use Email Verification?
Email Verification fits situations like: : verify emails; validate emails; email verification; check emails before sending.
How do I install Email Verification in Claude Code?
Run `npx skills add extruct-ai/gtm-skills --skill email-verification -a claude-code`. Or copy the skill folder (skills/email-verification in extruct-ai/gtm-skills) into .claude/skills/email-verification in your project. Claude Code loads it when a task matches its description.
How do I install Email Verification in Codex?
Run `npx skills add extruct-ai/gtm-skills --skill email-verification -a codex`. Or copy the skill folder (skills/email-verification in extruct-ai/gtm-skills) into .agents/skills/email-verification in your project. Codex loads it when a task matches its description.
Can I use Email Verification 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 extruct-ai/gtm-skills --skill email-verification -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/email-verification, .gemini/skills/email-verification, .github/skills/email-verification and .opencode/skills/email-verification in your project.
What does Email Verification need to run?
SKILL.md names no scripts, command-line tools or credentials: Email Verification is instructions for the agent only.
Does Email Verification access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Email Verification 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. Review the folder before installing.
What licence does Email Verification use?
No licence was found for Email Verification or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Email Verification use?
About 1.1k tokens (SKILL.md is roughly 4.5k 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 Email Verification?
Skills that share tags, products or a category with Email Verification: Data Table Manager (n8n-io/n8n, 207k stars), Instrument Data To Allotrope (aws-samples/amazon-bedrock-agents-healthcare-lifesciences, 274 stars), Abuse Hunter (nexu-io/harness-engineering-guide, 663 stars) and Markit (shift-labs-ai/markit, 1.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Email Verification?
extruct-ai (a GitHub organization) maintains it in extruct-ai/gtm-skills, which has 109 GitHub stars. The repository holds 20 skills in this directory. The repository was last updated on September 28, 2026.
Source: extruct-ai/gtm-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.