Show HN: Strata – an expressive semantic layer that can say no to your LLM

Category: devtools

Tags: semantic-layer, sql-planner, llm-safety, rust, mcp

Score: 8.3/10 (Innovation: 8, Technical: 8, Documentation: 9, Utility: 8)

0sql is an open-source semantic layer and SQL planner that resolves business-term queries against a governed YAML model, producing deterministic SQL or refusals without ever connecting to a warehouse. It supports 13 dialects, safe multi-fact blending, row-level security, and an MCP server for LLM agents, making it a compelling safeguard against hallucinated SQL generation.

Target audience: data engineers, analytics engineers, backend developers building LLM agents

Repository: https://strata.do/ · Rust · MIT · 6 stars

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