Show HN: AgentFuse – A local circuit breaker to prevent $500 OpenAI bills (github.com)

AgentFuse has been launched as a vital tool designed to prevent excessive billing from AI service providers like OpenAI. This local circuit breaker addresses common pitfalls for developers, such as infinite loops or poor error handling, which can lead to unexpectedly high bills—sometimes as much as $500 overnight due to runaway processes like retrying failed tool calls or executing incorrectly defined loops. By integrating seamlessly into existing code, AgentFuse offers features like hard budget limits, pre-flight checks to block costly API calls, and a fail-safe architecture to protect applications from breaking. This tool is particularly significant for developers working with large language models by reinforcing fiscal accountability in AI transactions. With a lightweight SQLite database, AgentFuse operates without external dependencies, promising zero latency while implementing strict spending caps during agent sessions. Users can easily replace OpenAI clients with AgentFuse, maintain the same functionality, and monitor their expenses through customizable settings. Overall, AgentFuse aims to enhance developer safety and trust in AI integrations, ensuring financial overruns become a thing of the past.