Codex
Uses the Agent Skills adaptation (agentskills.io), not the native Claude
Cursor
Uses the native Claude skills specification. Cursor reads plugin and skill configuration from your system's ~/.claude/ directory (the same tree Claude Code uses), so a marketplace install performed once in Claude Code is available in Cursor after a window reload.
Antigravity
Antigravity implements the Agent Skills (agentskills.io) spec — a skill
Grok
Uses the native Claude skills specification. Grok Build (xAI's terminal coding
Kilo Code
Uses the native Claude skills specification.
Kimi Code
Uses the native Claude skills specification via extraskilldirs in ~/.kimi-code/config.toml.
NVIDIA NIM
DRAFT. The architecture and the model-proxy requirement below are Verified against fcc's
OpenCode
Uses the native Claude skills specification — the same family as Kilo Code (and Pi) true — only name, description, license, compatibility, and metadata are recognized skill-frontmatter fields; unknown fields are ignored — so the three skills' explicit-only invocation is reproduced through an opencode.json override. That override is the one real difference from a Kilo Code setup.
Pi
Uses the native Claude skills specification.