system-prompt-skills

Anthropic Skills collects Claude skill examples, the Agent Skills specification, and a starter template for document, development, enterprise, communication, and creative tasks. The repository can be registered as a Claude Code plugin marketplace, and its example skills can also be used through Claude.ai or the API. A custom skill is a directory containing a SKILL.md file with YAML frontmatter and instructions. Most examples use Apache 2.0, while the document-creation skills are source-available rather than open source.

awesome-claude-skills curates Claude skills, resources, and tools for document work, development, data, communication, media, project collaboration, and security, with guidance for creating custom skills. It also highlights the connect-apps plugin, which uses Composio to connect Claude to more than 500 apps for actions such as email, issues, and Slack posts. That connector needs a Composio API key, and listed projects have their own setup and licenses.

Mercury Skills collects 132 SKILL.md playbooks across 23 categories in a searchable registry with detail pages, trending rankings, and local bookmarks. Skills can be installed through the Mercury CLI with version pinning and rollback safeguards, or copied directly into an agent’s skill directory. The same format is intended for Mercury, Claude Code, Codex, OpenClaw, Hermes, Cursor, and Gemini CLI, while public JSON feeds let other tools consume the catalog.

SkillsVote connects skill collection, profiling, just-in-time recommendation, and post-task attribution into one lifecycle workflow. It offers a hosted integration for recommendation and feedback, plus a local-first option for private SKILL.md libraries. Local attribution and evolution are still on the roadmap rather than fully available.