clean-validate

clean-validate is a skill for Claude Code from Frontal-so/outbound-skills. It costs 99 tokens per session (1,105 once invoked), scanned A, original, MIT.

A guide for checking whether email addresses and phone numbers are usable before contacting them. It also covers list hygiene, which means regularly removing or rechecking outdated and risky contact data.

In plain words
What is it for?
Use it to verify contact lists, classify validation results, handle catch-all addresses, set rechecking schedules, and monitor bounce and deliverability risks.
Why use it?
It helps reduce bounced emails, protect sender reputation, and remove invalid, disposable, role-based, or spam-trap addresses.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: positional $N argument.

Good fit Use it to verify contact lists, classify validation results, handle catch-all addresses, set rechecking schedules, and monitor bounce and deliverability risks.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/frontal-so/outbound-skills/clean-validate
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add Frontal-so/outbound-skills --skill clean-validate
Clone the repo
git clone --depth 1 https://github.com/Frontal-so/outbound-skills

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for clean-validate

README.md
[![agentmods](https://agentmods.dev/badge/skills/frontal-so/outbound-skills/clean-validate/github.svg)](https://agentmods.dev/skills/frontal-so/outbound-skills/clean-validate)
Your own site
<a href="https://agentmods.dev/skills/frontal-so/outbound-skills/clean-validate"><img src="https://agentmods.dev/badge/skills/frontal-so/outbound-skills/clean-validate/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for clean-validate

Your own site · 80×15
<a href="https://agentmods.dev/skills/frontal-so/outbound-skills/clean-validate"><img src="https://agentmods.dev/badge/skills/frontal-so/outbound-skills/clean-validate.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 99 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,105 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00099 $0.01105
Opus 5 $0.00049 $0.00553
Sonnet 5 $0.00020 $0.00221
Haiku 4.5 $0.00010 $0.00111

Measured 9d ago against content hash 626673142a8e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

clean-validate scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

master-skills/list-building/.claude/skills/clean-validate/SKILL.md · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Clean & Validate — Sub-Skill

You help users verify email and phone data, manage bounce rates below 1%, and establish list hygiene schedules. Always read the reference file before responding.

Reference

Read {SKILL_BASE}/resources/data-validation.md — all sections.

Email Verification Tools

Tool Cost Accuracy Best For
ZeroBounce $0.008/email 98%+ High-volume, agencies
NeverBounce $0.008/email 99.9% Bulk verification
Findymail $49/mo (1K) 97%+ Find + verify combined
MillionVerifier $37/10K 99%+ High volume, low cost
Bouncer $8/1K 99.5% EU compliance focus

Verification Result Categories

Category Action
Valid/Deliverable Safe to send (target: 95%+ of list)
Invalid/Undeliverable Remove immediately
Risky/Accept-All (Catch-all) Send cautiously or find alternative. Use ListKit/Listman.io for catch-all sub-verification
Unknown Treat as risky, do not send
Disposable Remove (temporary email)
Role-based (info@, sales@) Remove — higher spam complaint risk
Toxic/Spam Trap Remove immediately

Critical Metrics

Metric Target Danger Zone
Bounce rate <1% >3% = pause campaigns immediately
Spam complaint rate <0.1% >0.3% = investigate
Email deliverability 95%+ <90% = infrastructure issue

Data Decay Rates

  • Email addresses — 22-30% annual decay (~2.1%/month)
  • Phone numbers — 15-20% annual decay
  • Job titles — 30-35% annual decay
  • Company employment — 20-25% annual decay

List Hygiene Schedule

Frequency Action
Before every campaign Full email verification on entire list
Weekly Monitor bounce rates, remove hard bounces
Monthly Re-verify risky and catch-all emails
Quarterly Full re-verification, update job titles, purge unengaged (no opens/clicks 90 days)
Bi-annually Complete data refresh from LinkedIn, re-verify all
Annually Full ICP audit, rebuild lists from scratch

Read the full file on GitHub · 87 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 87 lines · 99 tokens per session scan A 626673142a8e

Subscribe to this mod's changes

clean-validate is a skill published in the GitHub repository Frontal-so/outbound-skills (5 stars, last pushed 1mo ago), licensed MIT. It adds 99 tokens to every session and 1,105 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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