# Explicit storage now required for knowledge filtering

> When using knowledge_filters, you must configure contents_db. This ensures deterministic, stateless filtering aligned with AgentOS and prevents silent mismatches.

- Published: 2025-11-21
- Author: Agno Team
- Category: Changelog
- Canonical: https://agno-com-nine.vercel.app/articles/explicit-storage-now-required-for-knowledge-filtering
- Markdown: https://agno-com-nine.vercel.app/articles/explicit-storage-now-required-for-knowledge-filtering.md

When using knowledge_filters, you must configure contents_db. This ensures deterministic, stateless filtering aligned with AgentOS and prevents silent mismatches.

**Details**

- Action required: provide a contents_db for any knowledge base that uses filters
- Improves reliability and reproducibility of retrieval and filtering

**Who this is for:** Teams building RAG and knowledge-aware agents at scale.