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Show HN: Built an open-source local firewall for AI coding agents

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GitHub: https://github.com/ashp15205/guardian-runtimeDocs: https://ashp15205.github.io/guardian-runtime/Hi Guys,I built Guardian Runtime: a local FinOps and security proxy for AI coding agents (like Claude Code, Cursor, and Aider).You point your agent to localhost:8080 instead of the real LLM API, and it sits in the middle to do three things:1. Hard Budgets: Auto-kills the agent's internet access if it gets stuck in a retry loop and hits your daily spend limit. 2. Local Scanners: Instantly drops outgoing requests that contain leaked API keys or PII. 3. Terse Mode: Optimizes system prompts to force shorter answers, cutting your API output costs by 40–70%.It runs entirely on your machine with zero cloud dependency, and supports OpenAI, Anthropic, and Gemini out of the box.pip install guardian-runtimeI'd love to hear your feedback or see if you can break it! Comments URL: https://news.ycombinator.com/item?id=48456339 Points: 2 # Comments: 0

HackerNews Show AI8 days ago
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Show HN: Built an open-source local firewall for AI coding agents | Steek AI Signal | Steek