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 - [hashicorp-agent-skills](https://github.com/hashicorp/agent-skills) - HashiCorp-maintained Claude skills for Terraform workflows and infrastructure automation.
 - [agnix](https://github.com/avifenesh/agnix) - Linter for AI agent configurations. Validates SKILL.md, CLAUDE.md, hooks, MCP configs, and more with 156 rules, auto-fix, and LSP server for real-time editor diagnostics.
 - [email-html-mjml](https://github.com/framix-team/skill-email-html-mjml) - Generate responsive HTML email templates using MJML 4.x — cross-client compatible HTML with compilation, validation, width math, and component architecture.
+- [agent-cards-skill](https://github.com/agent-cards/skill) - Manage prepaid virtual Visa cards for AI agents. Create cards, check balances, view credentials, close cards, and get support via MCP tools.
 - [Design Auditor](https://github.com/Ashutos1997/claude-design-auditor-skill) — Audits designs against 17 professional rules: typography, WCAG, spacing, iconography, navigation, tokens + more. Scores out of 100. Supports English & Korean.
 - [lightning-factory-explainer](https://github.com/8144225309/superscalar-mcp/tree/master/skills/lightning-factory-explainer) - Explain Bitcoin Lightning channel factories and the SuperScalar protocol — scalable Lightning onboarding using shared UTXOs, Decker-Wattenhofer trees, timeout-signature trees, MuSig2, and Taproot.
 - [lightning-channel-factories](https://github.com/8144225309/superscalar-mcp/tree/master/skills/lightning-channel-factories) - Technical reference on Lightning Network channel factories, multi-party channels, LSP architectures, and Bitcoin Layer 2 scaling without soft forks.