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Show HN: A Firewall for AI agents with auditing

A developer built a firewall for AI agents in Rust that runs under five milliseconds, using a DAG to plan and enforce actions, track tool calls and data flow, and flag out-of-context reads. The tool addresses security concerns with agent-based systems by avoiding the hallucination and latency issues of LLM-based guards.

read1 min views1 publishedJun 29, 2026

Hi all,

As there are more and more agents in the internet; Security is going to be a big problem. Currently, the problem is solved using a LLM to guard Agent but this creates the problem of hallucination and latency, so I coded a firewall in rust that runs under five miliseconds. This works by creating a plan and enforcing the plan; for per action call, this enforces using the Model context protocols list and for sequence it tracks every single tool call and data flow; there is also a taint mechanism where if the agent reads something outside of the user context, it flags and adds more security mechanism. It works by using a DAG.

Comments URL: [https://news.ycombinator.com/item?id=48726867](https://news.ycombinator.com/item?id=48726867)

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