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grith
Your agent decides what's safe. grith decides what runs.
Open-source supervisor that sits underneath AI coding agents at the OS level. It scores security-relevant syscalls against 18 filters before the kernel runs them: safe calls proceed, ambiguous ones freeze for review, dangerous ones are denied. MPL-2.0, local.
I built grith because I kept approving agent actions I had not actually read. Claude Code, Codex and Aider all ask permission, then most of us hit auto-approve and hope. The agent is grading its own homework.
grith sits underneath the agent at the OS level. On Linux it uses ptrace plus a seccomp-BPF pre-filter to intercept the security-relevant syscalls an agent makes and scores each against 18 filters in three phases: secret scanning (1,617 patterns), sensitive-path detection, egress policy, taint tracking and more. The matching layers are deterministic and there is no LLM in the enforcement path, so a prompt cannot talk the proxy out of a verdict. Median scoring time is 0.017ms. Under 3.0 runs. Between 3.0 and 8.0 the process freezes until a human reviews it. Over 8.0 gets an EPERM injected.
It is one static binary, MPL-2.0, model-agnostic (Ollama, OpenAI, Anthropic, OpenRouter) and runs entirely locally. Wrapping a tool is one command:
grith exec claude
(Or codex, cline etc)
The free tier is the whole security core, offline, no account and no phone-home, capped at two concurrent supervised sessions. Linux only today, Windows and Mac coming soon.
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About grith on Product Hunt
“Your agent decides what's safe. grith decides what runs.”
grith was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #143 on the daily leaderboard. Open-source supervisor that sits underneath AI coding agents at the OS level. It scores security-relevant syscalls against 18 filters before the kernel runs them: safe calls proceed, ambiguous ones freeze for review, dangerous ones are denied. MPL-2.0, local.
grith was featured in Developer Tools (519.8k followers), Artificial Intelligence (479.1k followers), GitHub (41.4k followers) and Security (2.9k followers) on Product Hunt. Together, these topics include over 242.7k products, making this a competitive space to launch in.
Who hunted grith?
grith was hunted by Dan. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Dan