Developer Builds Open-Source Proxy to Stop AI Agents From Overrunning API Budgets
A developer building AI agents for several months encountered a costly failure when an agent entered a loop, making repeated API calls that inflated the bill without any obvious crash or error. The incident prompted them to create SpendGuard, an open-source proxy that sits between the user and the agent to enforce spending limits. The tool can cut off mid-stream calls once a budget cap is reached, detect and break repetitive prompt loops before calls are sent, and block specified tool calls such as delete operations. SpendGuard runs locally and requires no account signup, and its code is publicly available on GitHub. The developer is now seeking community feedback to determine whether runaway agent costs are a widespread problem or an isolated personal experience.
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