I built DelegateOS because every agent framework today assumes all agents are trusted. CrewAI, AutoGen, LangGraph, MCP, A2A — none of them answer a basic question: when Agent A delegates to Agent B, what prevents B from accessing things A never intended?

The Google DeepMind delegation paper (arxiv.org/abs/2602.11865, Feb 2026) calls this out explicitly. MCP handles tool access, A2A handles agent communication, but nobody handles the trust and accountability layer between them. DelegateOS fills that gap with Ed25519-signed delegation tokens that enforce monotonic attenuation (sub-agents can only get narrower scope), budget caps across delegation chains, contract-based task verification, and cryptographic attestation chains for auditing.

It's a TypeScript library, MIT licensed, 374 tests passing. Ships with an MCP middleware plugin so you can drop it into existing MCP setups. The token format is inspired by Biscuit/Macaroons but purpose-built for agent delegation.

https://github.com/newtro/delegateos