Stillsane is an open-source Python library for monitoring LLM-powered applications and agents. It helps developers detect silent failures, performance drift, and regressions in LLM outputs over time. The package provides tools for observability and automated evaluation to ensure reliability of LLM-based systems.
stillsane is a LLM eval & observability project. It focuses on detecting when an LLM application has quietly degraded in performance or started producing incorrect outputs without obvious errors. stillsane is an open-source project aimed at developers. stillsane is open source under the MIT license. It runs on the command line and API.
Sanket builds and maintains stillsane, and it first shipped in 2026. Development happens publicly on GitHub with 11 commits in the last 90 days. Among its 4 catalogued features are Drift Detection, Regression Testing, and LLM Monitoring.
Summary written by a language model from the project’s public pages.
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