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Show HN: Aura Guard – stop agent tool loops and duplicate side effects (github.com)

3 points by aura-guard ↗ HN
I built Aura Guard after repeatedly seeing tool-using agents burn money the same ways: looping search calls, retrying 429/timeouts forever, and double-firing side effects (refund twice / duplicate emails).

Aura Guard is a small Python middleware that sits between an agent loop and its tools. Before a tool runs, it returns a deterministic decision (ALLOW / CACHE / BLOCK / REWRITE / ESCALATE / FINALIZE). No LLM calls inside the guard, just counters + signatures + similarity checks.

Quick demo (no API key):

pip install git+https://github.com/auraguarddev-debug/aura-guard.git aura-guard demo

Feedback welcome, especially on “rephrase & retry” detection thresholds (currently overlap coefficient 0.60, repeat threshold 3).

2 comments

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aura-guard
Author here. Happy to answer questions. If you’ve dealt with “rephrase & retry” tool loops or duplicate side effects (refund/email twice), I’d love feedback on the heuristics and thresholds. Quick demo is aura-guard demo after install. Repo has a benchmark harness + JSON reports.