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Skill comparison

Compare agent skills before installing.

Put high-signal skills side by side and inspect quality, adoption, freshness, install readiness, use-case fit, and warnings in one place.

Comparing 4 skills

Use this as a shortlist, then open the skill detail page before adopting.

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Decision summary

Check If Email Exists is the strongest overall pick here because it has a 100/100 readiness score and fits Workflow automation.

Strongest overall

Check If Email Exists

Use this as a leading candidate, then validate the README and install path in your own agent stack.

Fastest prototype

Check If Email Exists

Best first install candidate based on install readiness and adoption.

Freshest repo

Mailchecker

Most recent maintenance signal among this shortlist.

SignalCheck If Email Exists

Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend.

Lettre

a mailer library for Rust

Mailchecker

:mailbox: Cross-language temporary (disposable/throwaway) email detection library. Covers 55 734+ fake email providers.

Truemail

🚀 Configurable framework agnostic plain Ruby 📨 email validator/verifier. Verify email via Regex, DNS, SMTP and even more. Be sure that email address valid and exists.

Quality
96/100
Excellent
100/100
Excellent
100/100
Excellent
71/100
Strong
Decision verdict
100/100
Production-ready

Use this as a leading candidate, then validate the README and install path in your own agent stack.

100/100
Production-ready

Use this as a leading candidate, then validate the README and install path in your own agent stack.

100/100
Production-ready

Use this as a leading candidate, then validate the README and install path in your own agent stack.

73/100
Strong shortlist

Shortlist this skill and compare it with close alternatives before production adoption.

Adoption8.8K stars
0 installs
2.2K stars
0 installs
1.9K stars
0 installs
1.3K stars
0 installs
FreshnessMar 17, 2026Jun 12, 2026Jun 16, 2026Apr 23, 2024
Use-case fit
Workflow automationCoding agentsRAG and knowledge
Workflow automationCoding agentsRAG and knowledge
Workflow automationCoding agentsRAG and knowledge
Workflow automationCoding agentsRAG and knowledge
Stack fit
Content growth agentCoding review agent
Content growth agentCoding review agent
Content growth agentCoding review agent
Content growth agentCoding review agent
Platform hintsRust, Email, Claude CodeRust, Email, Claude CodePHP, Email, Claude CodeRuby, Email, Claude Code
WarningsNo OpenAgentSkill engagement data yetNo OpenAgentSkill engagement data yetNo OpenAgentSkill engagement data yetRepository looks stale · No OpenAgentSkill engagement data yet
Best forWorkflow automation workflows · Claude Code teams · teams that value GitHub adoption signalsWorkflow automation workflows · Claude Code teams · teams that value GitHub adoption signalsWorkflow automation workflows · Claude Code teams · teams that value GitHub adoption signalsWorkflow automation workflows · Claude Code teams · teams that value GitHub adoption signals
Not ideal forteams that need a vendor-supported SLA · high-compliance environments without internal security reviewteams that need a vendor-supported SLA · high-compliance environments without internal security reviewteams that need a vendor-supported SLA · high-compliance environments without internal security reviewteams that require actively maintained dependencies · production agents without a repository review
OpenAgentSkill engagement0 views
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Install
$ npx skills add reacherhq/check-if-email-exists
$ npx skills add lettre/lettre
$ npx skills add FGRibreau/mailchecker
$ npx skills add truemail-rb/truemail