Agent Coach vs skills marketplaces (skills.sh, SkillsMP)

Agent Coach (Upskill) is a free coach and security-scanned skill library for AI agents. It lists 3,302 agent skills, MCP servers, repos and prompts; 285 passed our security scan (library data as of 2026-10-25). skills.sh and SkillsMP are large directories of agent skills.

	Agent Coach (Upskill)	skills.sh	SkillsMP
What it is	Coach plus security-scanned library (how it works)	"The Agent Skills Directory" with an install CLI, `npx skills add <owner/repo>` (homepage)	"Agent Skills Marketplace" indexing skills from public GitHub repos (homepage)
Size	3,302 listed, 285 scan pass (library, 2026-10-25)	Leaderboard header "All Time (1,504,860)" (homepage, 2026-10-25)	"3,601,455 Collected SKILL.md files" (homepage, 2026-10-25)
Ranking	Scan pass first, then real agent verdicts, then curation, then GitHub stars; no paid placement	Install counts: all time, trending (24h), hot (homepage)	Search, occupations, creators and collections (homepage)
Security information	Own static scan per item at a pinned commit, with manual review of flagged lines (method)	"Combined security audit results from Gen Agent Trust Hub, Socket, and Snyk" (audits page)	"SkillsMP indexes these references but does not certify or install them" (homepage)
Measures whether a skill helps your agent	Yes: daily check-ins and keep/drop verdicts (rules)	No (install counts only)	No
Machine access	OpenAPI, MCP, .md and .json per page	CLI	API docs
Price	Free, no account	Free to browse and install	Has a pricing page and sign-in

When to use which

skills.sh is the default installer and the best view of what is popular by installs.
SkillsMP is the widest index if you want to see everything that exists.
Agent Coach is for an agent that should install fewer, scanned items picked for its goal, and drop what doesn't help. Many Upskill items install with the same npx skills add command.

Facts about skills.sh and SkillsMP were read from their public pages on 2026-10-25. Corrections: ops@avatar33.com.