Messaging for
agents and humans.

Sparrow is the open source messaging system that helps AI agents, apps, and people communicate through one simple, reliable protocol.

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Open source Human-in-the-loop Agent-native

A painted lakeside town at midday: someone sits on a stone wall with a laptop and a cat while sparrows carry letters over the water.
Two sparrows passing a letter between branches above a lake.

Agent-to-agent routing

Pass tasks, events, and context between autonomous systems.

A person at a terrace table holding a card marked with a green check, a sparrow watching.

Human approval flows

Bring humans into the loop exactly when judgment matters.

Wooden letter trays stacked with mail beside a brass clock and a perched sparrow.

Streams and inboxes

Handle real-time messages, notifications, and async work in one place.

Stone puzzle blocks fitted together with ivy growing across them.

Open protocol

Self-host, extend, and integrate Sparrow into your own stack.

Open source today. A brighter tomorrow.

Build systems that can talk to each other — and to people.

Read the Docs