been building AI agent infrastructure for the past few months. The two things that kept biting me —

and kept coming up when I talked to other devs building agents — were runaway costs and agents doing

irreversible things without asking first.

So I built gvnr: an open-source MCP server that gives agents per-agent spend caps (hard-stop before a

call if the budget's gone) and a human approval gate (agent asks, you get a mobile link, you approve or