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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.
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-
+- [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.
 
 ## 📊 Data & Analysis
 - [root-cause-tracing](https://github.com/obra/superpowers/tree/main/skills/root-cause-tracing) - Use when errors occur deep in execution and you need to trace back to find the original trigger