FuseBox

What it does

FuseBox is a Python circuit breaker for AI agent loops. Add one line of code — @wrap(max_time=300, max_cost=5.0) — and it stops runaway API costs, infinite loops, and bill shock. Five configurable limits (time, iterations, tokens, cost, daily budget), CLI tools, and full source code included. No cloud, no subscription. $29 one-time, you own it forever.

Stop runaway AI agent costs with one line of Python. Your agent loops overnight and burns $400 in API calls. SDKs ship no hard ceiling. FuseBox wraps any agent loop with configurable limits on time, iterations, tokens, and cost. When any limit trips, it stops at the next loop boundary and dumps the full state for debugging. ▶️ One line of code: @wrap(max_time=300, max_cost=5.0) def my_agent(task):

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