Show HN: Sentinel – open-source QA agent that reads your code before it clicks
Sentinel is a new open-source QA agent that analyzes a codebase to derive and execute business-logic tests without manual configuration. Unlike traditional agents that simply click UI elements, Sentinel models the product's purpose to perform deep-end testing.
Why it matters
It represents a shift in AI-driven software testing from surface-level automation to context-aware, autonomous quality assurance.
Sentinel reads the codebase, works out the real business flows, and tests them end to end across the frontend and the backend. It's open source under MIT.
Put a typical AI agent on your app and it opens a page, clicks a few buttons, notices a misaligned element or a console error, and calls the run done. That's useful the way a smoke test is useful. The agent has no model of what your product actually does.
A QA engineer worth hiring doesn't click around. They learn the product first, then reason about it: this is a hotel system, so I need to test a single booking, a group booking, a cancellation that frees the room back up, check-in, check-out, and the night audit, and I need to confirm each one actually persisted on the server instead of trusting that the UI looked happy.
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