tethered
Your app's network firewall — in one function call.
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Sergii Shcherbak

tethered - Your app's network firewall — in one function call.

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ContextGem
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A zero-dependency Python library that restricts outbound network access at runtime. Declare an allow list, and every socket call outside it is blocked — supply chain defense, AI agent guardrails, and test isolation in a single line of code.

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Sergii Shcherbak
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Hey community! I built tethered because Python has no built-in way to restrict outbound network access at runtime. One function call, zero dependencies — declare an allow list and any socket call outside it is blocked before a packet leaves the machine. Uses Python's audit hook system (PEP 578), no monkey-patching or proxies. Built it mainly for supply chain defense (compromised deps can't phone home), AI agent guardrails, and test isolation. Works with requests, httpx, aiohttp, Django, FastAPI — anything built on Python sockets. Fully open-source (MIT). Would love your feedback!