Skip to main content
This quickstart assumes you’ve already run the top-level quickstart and have the gateway running on localhost:3100. Now we’ll build against it.

Install an SDK

Your first intercept

What just happened

1

Token issued

The gateway generated an Ed25519-signed capability token bound to your agent DID and scoped to mcp://weather/*.
2

Request intercepted

The intercept call sent a SintRequest to the gateway. The gateway validated the token, checked scope, computed the effective tier via the escalation function, and returned a PolicyDecision.
3

Ledger entry

The decision was written to the evidence ledger with a SHA-256 hash linking it to the previous entry. You can verify the chain via /v1/ledger/verify.

Wiring up your agent

The intercept pattern works with any agentic framework. Wrap every tool call with an intercept check.

Framework integrations

LangChain

Use @sint/integration-langchain to wrap every LangChain tool in a SINT-governed callback.

MCP

Deploy the SINT MCP bridge in front of any MCP server. See bridges.

ROS 2

Deploy the ROS 2 bridge node to intercept topics, services, and actions with physics-aware policy.

OpenClaw

Drop in @sint/openclaw-adapter. Every OpenClaw tool call passes through the Gateway.

SDKs

Per-language SDK reference.

API reference

All gateway endpoints.

Deployment

Production deployment recipes.

Contributing

Contribute to the protocol.