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.
Decision summary
PHPMailer is the strongest overall pick here because it has a 100/100 readiness score and fits Workflow automation.
Strongest overall
PHPMailer
Use this as a leading candidate, then validate the README and install path in your own agent stack.
Fastest prototype
PHPMailer
Best first install candidate based on install readiness and adoption.
Freshest repo
Mailspring
Most recent maintenance signal among this shortlist.
| Signal | Astroid A graphical threads-with-tags style, lightweight and fast, e-mail client for Notmuch | Himalaya CLI to manage emails | Mailspring :love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux. | PHPMailer The classic email sending library for PHP |
|---|---|---|---|---|
| Quality | 70/100 Strong | 100/100 Excellent | 100/100 Excellent | 100/100 Excellent |
| Decision verdict | 81/100 Strong shortlist Shortlist this skill and compare it with close alternatives before production adoption. | 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. |
| Adoption | 638 stars 0 installs | 6.4K stars 0 installs | 18K stars 0 installs | 22K stars 0 installs |
| Freshness | Feb 26, 2026 | Jun 12, 2026 | Jun 15, 2026 | Jun 6, 2026 |
| Use-case fit | ||||
| Stack fit | ||||
| Platform hints | C++, Email, Claude Code | Rust, Email, Claude Code | JavaScript, Email, Claude Code | PHP, Email, Claude Code |
| Warnings | No OpenAgentSkill engagement data yet | No OpenAgentSkill engagement data yet | No OpenAgentSkill engagement data yet | No OpenAgentSkill engagement data yet |
| Best for | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals | Workflow automation workflows · Claude Code teams · teams that value GitHub adoption signals |
| Not ideal for | teams that need a vendor-supported SLA · high-compliance environments without internal security review | teams that need a vendor-supported SLA · high-compliance environments without internal security review | teams that need a vendor-supported SLA · high-compliance environments without internal security review | teams that need a vendor-supported SLA · high-compliance environments without internal security review |
| OpenAgentSkill engagement | 0 views 0 install copies | 0 views 0 install copies | 0 views 0 install copies | 0 views 0 install copies |
| Install | $ npx skills add astroidmail/astroid | $ npx skills add pimalaya/himalaya | $ npx skills add Foundry376/Mailspring | $ npx skills add PHPMailer/PHPMailer |