Developer Tom Dörr has released an open-source tool that bulk-installs 575 AI agent skills for Google Antigravity , Google's agentic development platform, letting users add a set of specialized capabilities to a project with a single npx command.
November 2025 · Open-Source Tooling
575 AI Agent Skills, Installed With a Single Command
A new open-source tool bulk-installs hundreds of specialized "skills" into Google Antigravity projects via one npx command — part of a fast-growing race to package reusable agent capabilities.
575
skills (573 core + nested tactics)
2,977
nested tactics ("Fractal Intelligence")
669k
lines across 10.9k files
Two skill collections, by scale
Both target Google Antigravity. Column height ∝ number of skills.
575
Tom Dörr version
16 rules · 30 flows · single npx
1,600+
sickn33 version
role bundles · search catalog · CLI
How the install works
Run npx command
agent-skills-setup
→
Place GEMINI.md
at project root
→
Write .agent/
rules · skills · workflows
→
Agents ready
validate · update · repair
What developers value
Immediate execution of specialized tasks
More consistent output than random prompting
Chain skills into complex, production-ready workflows
Operational challenges
Learning curve of initial setup
Context management & performance at scale
Verifying behavior outside officially supported tools
An open standard becomes a battleground.
Built on Anthropic's open Agent Skills spec — compatible with Gemini and Claude Code — maintaining large skill collections is shaping up as a key axis of competition in agentic coding environments.
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