Show HN: Mistle – Open-source infrastructure for running sandboxed coding agents https://ift.tt/2VB1Q9m

Show HN: Mistle – Open-source infrastructure for running sandboxed coding agents Hi HN, I'm Jonathan. My co-founder, Thomas, and I started building Mistle in Feb. 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://ift.tt/dHQSJoC Questions, feedback and ideas are welcome! https://ift.tt/ciOf7VK May 13, 2026 at 09:37PM