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Dev tools · May 13, 2026

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,…

Mistle – Open-source infrastructure for running sandboxed coding agents launched on May 13, 2026 with 6 votes, #1,742 of 20,538 launches that month and more than 75% of that year's launches.

Visit github.com ↗Alternativestop 8% of May 2026

What it does

Open source background agents. Contribute to mistlehq/mistle development by creating an account on GitHub.

In the maker’s words, at launch

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…

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