Antigravity skills

What a skill is

An Agent Skill is a folder with a SKILL.md file at its root — a name, a description that tells the agent when to reach for it, and instructions the model loads on demand. Antigravity adopted the open Agent Skills standard, which is the single most useful fact about the ecosystem: a skill written for Claude Code, Cursor, Codex CLI or Gemini CLI is, format-wise, the same artifact. The .agents/skills/ workspace folder and the global skills directory are where Antigravity looks; discovery is automatic once the folder exists.

What a skill is not: a rule. Rules are standing constraints injected into every run; skills are conditional playbooks the agent activates when the task matches. "Always run the typechecker before committing" is a rule. "How to migrate a Postgres schema safely" is a skill — it sits dormant until a migration comes up, then injects its procedure.

The three shapes collections come in

The collections on this page sort into three kinds, and they behave differently once installed:

Skill vaults — hundreds of SKILL.md packages ported or written for Antigravity. You install the vault, then enable the handful that match your stack; the rest stay dormant.
Curated lists — awesome-* repositories that index the ecosystem rather than ship skills themselves. They are the discovery layer: start here to see what exists, then install from the linked source.
Registries and marketplaces — installable collections with a validation or review gate in front. Fewer skills, but each was checked before listing — the closest thing to a vetting layer the ecosystem has.

How to evaluate a collection before installing

Read the SKILL.md frontmatter, not the marketing. description is what the agent matches on — a vague description activates the skill in the wrong contexts and dilutes the ones that matter.
Skills are executable trust. A skill can bundle scripts and reference files; anything that runs should be read like dependency code, because it is.
Check the port lineage. Many Antigravity collections are ports of Claude Code packs — a good port rewrites the tool names and paths; a lazy one still says claude in the instructions and misfires.
Prefer collections with a removal story. Installing 300 skills to use six is fine — as long as disabling the other 294 is a folder operation, not a surgery.

Where skills overlap

The open standard means skill collections listed for Antigravity also serve Gemini CLI and Antigravity CLI (agy). Entries here are verified against their repositories — install commands and folder layouts are quoted from what the source actually ships, not from the author's blog post.