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Why We Turned RAG Into a Tool

· 7 min read
Stephan Janssen
Creator of DevoxxGenie

For months, DevoxxGenie's RAG pipeline worked beautifully — as long as you stayed in chat mode. Index your project into ChromaDB, ask a question, and the most relevant code chunks would automatically appear in the prompt as a <SemanticContext> block. It was invisible, automatic, and effective.

Then we shipped Agent Mode, and RAG fell off a cliff.

Users would ask conceptual questions like "which slides discuss MCP?" or "where do we explain the indexing pipeline?" and the agent would ignore the rich semantic context we had just injected. Instead, it reached for search_files — a regex grep — and returned nonsense. The semantic context had become wallpaper: present, but unseen.