I believe that cloud providers should make hard spending caps the default: when you hit your limit, everything stops, rather than you getting a warning email you only see after the damage.
The reason is simple: coding agents can now ship code that burns through paid APIs while you sleep.
We burned real money running AI agents and didn't know why until it was too late. That's the whole reason Guardrail exists.
It's a local proxy for Claude Code and Codex that shows you where every dollar goes, system prompt, tools, that MCP server you forgot about, before you spend it. When you're about to blow a budget, Guardrail blocks the request. Not after. Before.
Built for developers who'd rather see the bill coming than explain it later.
