Python agents that auto-register on a blockchain

What it does

uAgents is a Python framework from Fetch.ai for building event-driven autonomous agents. You define behavior with decorators—say, running a task on an interval—and the library handles the lifecycle. Every agent gets a cryptographic keypair and, on startup, registers itself on the Almanac, a smart contract on the Fetch.ai blockchain, so other agents can find it.

The interesting bit

The blockchain integration isn’t an afterthought; it’s the plumbing. Identity, messaging security, and network discovery are tied to on-chain registration from day one, which is unusual for a Python asyncio-style agent library. There’s even a compatibility path for ASI:One agents.

Key highlights

• Agents are plain Python objects with decorator-based event handlers (@agent.on_interval).
• Cryptographic identities and wallets are built-in; messages are signed and secured.
• Automatic registration to the Fetch.ai Almanac smart contract on startup.
• Supports synchronous communication, broadcast messaging, and local storage.
• Includes uagents-core for integrating with the broader Fetch.ai ecosystem and agent marketplace.

Caveats

• The project carries a stark disclaimer: it is provided “as-is” with no warranty, and users assume all risks including data loss or unexpected behavior.
• If you omit a seed phrase when creating an agent, a new blockchain address is generated on every run; persistent identity requires explicit key management.
• The README is largely a quickstart pointer; most advanced behavior lives in external documentation.

Verdict

Worth a look if you are already building on Fetch.ai or need blockchain-native agent discovery. Skip it if you just want a generic Python task scheduler or LLM glue; the on-chain identity is the point, not the side effect.