Budgie-firewall is an open-source spend control tool designed for AI agents. It intercepts cloud commands, estimates their cost in advance using pricing data, and blocks any that would exceed a predefined budget. It is particularly useful for autonomous agents that interact with services like AWS and Claude, providing guardrails against runaway costs. The package is distributed on PyPI and can be integrated into agent workflows via its CLI and API interfaces.
budgie-firewall is a LLM eval & observability product. It focuses on preventing unexpected high costs from autonomous AI agents making expensive cloud API calls. It is built as an open-source project for developers. budgie-firewall is open source under the MIT license. budgie-firewall is available on the command line and API, and it can be self-hosted.
TanishkaMarrott builds and maintains budgie-firewall, and the product first shipped in 2026. Development happens publicly on GitHub with 17 commits in the last 90 days. Key capabilities include Cost Estimation, Pre-execution Blocking, and Budget Enforcement. It exposes integrations via an MCP server and a public API.
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