AI/ML●●Solid
SpadeBox – Sandboxed tools and JavaScript runtime for AI agents
Cap-std sandboxing with no-bash design is a coherent security story for agents.
Big BrainShip It
charlycst
3010d ago
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Endo Familiar, an O-cap based JavaScript agent sandbox
by zmanian·Apr 23, 2026·13 points·3 comments
AI Analysis
●●●BangerBig BrainBold BetZero to One
O-cap security model beats the credential-bag approach every agent framework currently uses.
Strengths
- •Agent writes its own capability-narrowing programs instead of inheriting broad permissions.
- •WebSocket relay enables secure cross-machine agent collaboration without exposing file paths.
- •Addresses prompt injection damage containment before agents scale into critical infrastructure.
Weaknesses
- •Still a working prototype — no production deployment guidance or performance benchmarks yet.
- •Requires buying into the O-cap mental model, which has limited adoption in mainstream JS.
Category
Target Audience
Developers building AI agents with filesystem or API access
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