Show HN: Mistle – Open-source infrastructure for running sandboxed coding agents

We saw larger tech companies like Ramp (Inspect) and Stripe (Minions) build this internally and thought an open source version should exist.

We made a few very intentional decisions when working on this:

1. Credentials are kept out of the sandbox. Authorized access goes through a proxy, so agents do not directly receive credentials.

2. The harness is not our problem. We're not going to tackle things like memory, self-learning.

3. No magic. Configurations are explicit. You can bring your own keys for models, sandboxes, and other providers. You can write your own instructions and agent.

Mistle can be run locally with a single command: https://github.com/mistlehq/mistle#run-mistle-locally

Questions, feedback and ideas are welcome!