Coral

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Coral is a SQL query layer for agents. It turns any API, database, or file system into a read-only schema, so agents can join across sources in a single query — no custom integrations, no ETL, no glue code. Coral handles authentication, pagination, rate limits, and schema mapping, and exposes column-level access controls so you choose what an agent can see. Everything runs locally on your infrastructure; Coral doesn't ingest your data, store results, or train models on anything it sees. In benchmarks, agents using Coral are 31% more accurate and 70% cheaper to run than agents using source-level MCPs. Coral is open source under Apache 2.0, available via CLI or MCP.