Compare
Claude API vs Antigravity IDE
Side-by-side comparison of Claude API 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 | Claude API | Antigravity |
|---|---|---|
| Vendor | Anthropic | Antigravity |
| Native SKILL.md support | Yes | Yes |
| Verified skills indexed | 13 | 35 |
| Install model | POST /v1/skills | Local folder |
| Shell / Bash access | Sandboxed | Yes |
| Tagline | Claude API + Skills SDK. Pre-built skill_id values plus custom uploads via /v1/skills. | Antigravity IDE ships with the awesome-skills bundle (1,234+ pre-installed) out of the box. |
Both
3
Skills verified to work on both Claude API and Antigravity.
Only Claude API
10
Indexed for Claude API but not yet verified on Antigravity IDE.
Only Antigravity
32
Indexed for Antigravity IDE but not yet verified on Claude API.
Verdict
Which should you pick?
Both support SKILL.md natively, so the choice is about ecosystem fit. Pick Claude API for Anthropic 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 3 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 Claude API · Skills for Antigravity IDE.
FAQ
Common questions
Which is better for SKILL.md skills, Claude API or Antigravity IDE?
Both support SKILL.md natively. Claude API has 13 verified skills indexed here; Antigravity IDE has 35. 3 skills work on both.
Can I use the same Skill on Claude API and Antigravity IDE?
3 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 Claude API?
POST your Skill zip to /v1/skills. You receive a skill_id. Reference it in your messages request — the model loads the Skill on demand.
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: Claude API for Anthropic customers, Antigravity IDE for Antigravity customers.
More comparisons