Mistle
Open-source infrastructure for running sandboxed coding agents
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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://github.com/mistlehq/mistle#run-mistle-locallyQuestions, feedback and ideas are welcome!
HN · launched May 13, 2026 · 6 upvotes (top 69%) · 1 view
Niche: ai agent execution sandboxes · 137 launches, 6 in the last 7 days ▼ -25% · Explore this niche →
Category and tags
- Horizontal
- Dev tools
- Developer
- AI-native
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 137 launches in ai agent execution sandboxes →
Could you build this?
No Running untrusted agent code securely requires microVM virtualization, hardened sandbox networking, kernel-level isolation, and secure secret proxying that cannot be reliably vibe-coded.
What it would actually take: A production platform uses lightweight microVMs (like Firecracker or gVisor) orchestrating container lifetimes in milliseconds via Rust or Go. The system needs specialized network sandboxing (eBPF or iptables isolation) to enforce egress filtering and an out-of-band proxy that injects credentials dynamically into HTTP/API calls without exposing keys to the agent execution environment. This demands deep systems programming, Linux kernel security, and virtualization expertise.
Discussion
No comments on this launch.
Competitors
Other products that read as similar to this one : 729 launches clear the similarity bar, closest 8 shown.
Attention rank: #588 of 730 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 195 days after the earliest competitor.
- 143.dev · hn · 2026-06-30 · 13 upvotes · similarity 0.55
- Agent Vault · hn · 2026-04-22 · 156 upvotes · similarity 0.51
- Era · hn · 2025-11-27 · 62 upvotes · similarity 0.50
- Run Agent Skills with mistral.rs v0.8.10: /v1/skills support and more · hn · 2026-06-18 · 20 upvotes · similarity 0.50
- Run AI coding agents in real, local sandboxes, not Git worktrees · hn · 2026-04-12 · 6 upvotes · similarity 0.49
- How to build and self-host a code review agent · hn · 2026-07-31 · 29 upvotes · similarity 0.49
- AgentRun · hn · 2026-11-12 · 135 upvotes · similarity 0.48
- Agent-run · hn · 2026-07-12 · 8 upvotes · similarity 0.48
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