gate.cat
gate.cat blocks destructive shell commands before AI coding agents execute them. Open source, local, and fail-closed.
gate.cat launched on July 29, 2026 with 5 votes, #4,557 of 24,623 launches that month and more than 75% of that year's launches.
What it does
Your AI coding agent doesn't have to be malicious to end your week — just shell access and one confident mistake. gate.cat is a deterministic, fail-closed veto that inspects the tool call at the boundary and refuses the irreversible class (rm -rf, DROP TABLE, terraform destroy) before it runs. Claude Code hook, gated shell, or OpenAI-API proxy. Free forever, Apache 2.0. We replayed 826,644 real agent commands (re-counted 28 Jul, lower bound): 0 real misses — and we publish our own bypass map.
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