SINT Protocol
Open-source runtime security and governance for AI agents, MCP tools, robotics, industrial automation, and physical AI.
SINT Protocol is an open protocol and TypeScript reference stack that sits
between AI agent intent and real-world execution. Before a governed tool call,
robot command, industrial write, payment-like action, or actuator movement can
run, the request passes through PolicyGateway.intercept() for capability-token
authorization, T0-T3 approval tiering, physical constraint enforcement,
revocation checks, and tamper-evident evidence logging.
What is SINT Protocol?
SINT is an AI agent security control plane for actions with real-world consequence. It helps teams answer four questions before an autonomous system acts:
- Who is allowed to act? Ed25519 capability tokens bind issuer, subject, resource, action, expiry, constraints, and delegation chain.
- What constraints apply? Velocity, force, geofence, budget, rate-limit, and consent constraints travel with the token instead of living in ad hoc config.
- When is human review required? T0-T3 approval tiers route low-risk actions automatically and escalate physical or irreversible actions to operators.
- How do you prove what happened? Every decision can be written to a
SHA-256 hash-chained
EvidenceLedgerwith portable proof receipts.
