Compare
Codex CLI vs Antigravity IDE
Side-by-side comparison of Codex CLI and Antigravity IDE for SKILL.md agent skills — install model, shell access, native support, skill count and best use cases.
Comparison
At a glance
| Dimension | Codex | Antigravity |
|---|---|---|
| Vendor | OpenAI | Antigravity |
| Native SKILL.md support | Yes | Yes |
| Verified skills indexed | 45 | 35 |
| Install model | Local folder | Local folder |
| Shell / Bash access | Yes | Yes |
| Tagline | OpenAI's coding agent CLI. Adopted the SKILL.md spec verbatim in Dec 2025. | Antigravity IDE ships with the awesome-skills bundle (1,234+ pre-installed) out of the box. |
Both
14
Skills verified to work on both Codex and Antigravity.
Only Codex
31
Indexed for Codex CLI but not yet verified on Antigravity IDE.
Only Antigravity
21
Indexed for Antigravity IDE but not yet verified on Codex CLI.
Verdict
Which should you pick?
Both support SKILL.md natively, so the choice is about ecosystem fit. Pick Codex CLI for OpenAI integrations and the workflows it makes easiest; pick Antigravity IDE for Antigravity integrations and its specific surface.
Many teams use both — Skills with the SKILL.md spec are portable, and 14 of the skills indexed here are verified on both agents. Browse the per-agent rankings to see which Skills lead on each platform: Skills for Codex CLI · Skills for Antigravity IDE.
FAQ
Common questions
Which is better for SKILL.md skills, Codex CLI or Antigravity IDE?
Both support SKILL.md natively. Codex CLI has 45 verified skills indexed here; Antigravity IDE has 35. 14 skills work on both.
Can I use the same Skill on Codex CLI and Antigravity IDE?
14 of the skills indexed here work on both. The SKILL.md spec is shared, so most skills run cleanly on both — the exceptions are skills that depend on agent-specific tools (Bash, Workflows, MCP patterns).
How do I install a Skill on Codex CLI?
Drop the Skill folder under `~/.codex/skills/` for user-wide or `.codex/skills/` for project-scoped. Codex loads SKILL.md the same way Claude Code does.
How do I install a Skill on Antigravity IDE?
1,234+ as of the latest release. The bundle covers document processing, code quality, security, design, marketing, data and more — most users find what they need without installing anything.
Which agent should I pick for cross-platform skill use?
Both support skills natively. Pick by ecosystem fit: Codex CLI for OpenAI customers, Antigravity IDE for Antigravity customers.
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