Claude Skills Ecosystem Swells as Third-Party Marketplace Lists More Than 12,000 Reusable Agent Packages

A rapidly expanding library of reusable Claude "Skills" is reshaping how developers deploy Anthropic's coding agent, with one third-party marketplace now cataloging more than 12,980 packages spanning development, security, marketing and document processing. The growth marks one of the clearest signs yet that Anthropic's file-based extension format is maturing into a full ecosystem, complete with community collections, curated "best-of" lists and specialized multi-agent tools.