These aren't competitors — they're different things. agentskills.io is the home of the open SKILL.md / Agent Skills specification: the format itself. GuildSkills is a registry built on that spec — a searchable, ranked catalog of 195,000+ skills across 40+ compatible agents.
| agentskills.io | GuildSkills | |
|---|---|---|
| What it is | The format specification | A registry of skills built on it |
| Defines the SKILL.md format | Yes | No — we follow it |
| Lists installable skills | No | 195,000+, searchable + ranked |
| Per-agent install paths | — | 40+ agents |
| Quality Score | — | Pro multi-signal ranking |
Read agentskills.io to understand the SKILL.md format and the standard's governance. Use GuildSkills to actually find, rank and install skills for your agent. We point at the spec throughout — it's the foundation we build on.