smol-agent: Open-source agent that edits its own source code

yawnxyz · x · 2026-08-28

Developer reillyjodonnell released smol-agent, an open-source, fully customizable agent with self-building capabilities.

Core Mechanics & Features

The agent runs in a sandboxed environment powered by smolmachines for safe isolation.
It possesses the ability to edit its own source code, autonomously modifying its implementation.
Comes with built-in tools including bash and a hot reload feature to view changes in real-time.
Includes a minimal CLI for users to interact with the agent immediately.

Getting Started

The project offers a streamlined setup: configure an Anthropic API Key and run bun run agent to launch.

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