mini-SWE-agent

mini-SWE-agent is a deliberately minimal AI coding agent from the Princeton/Stanford team behind SWE-bench and SWE-agent. The entire core is roughly 100 lines of Python with a linear, append-only message history and a single tool: bash via subprocess. That brutal simplicity is the point — and it still cracks 74%+ on SWE-bench Verified, putting it in the same league as far more elaborate agent frameworks.

It's aimed at researchers, agent tinkerers, and engineers who want a hackable baseline rather than a productized assistant. Model-agnostic via litellm, OpenRouter, and Portkey, so you can plug in Claude, GPT, Gemini, or local models. Sandbox options span local, Docker, Podman, Singularity, and Bubblewrap, which makes it usable for batch inference on benchmark suites without root-level worries. Apache 2.0 and free.

There are Python bindings for embedding it in larger pipelines, but there's no hosted product, no UI, no SaaS billing, and no support contract. If you want a Cursor-style IDE or a managed autonomous engineer, look elsewhere; if you want a readable reference implementation that you can read in one sitting and extend in an afternoon, this is the one.