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Your LangChain SQL agent sends the model every table, including the ones that caller can't read

This story is from 2026-09-30. It is preserved in the archive; the latest stories are on the live feed.

A LangChain SQL agent hands the model your schema and asks it to write SQL. On a demo database with eight tables that is fine. On a real one it breaks in two ways at once. The schema outgrows the context window. I wrote about this before, on a warehouse with 1,245 tables — the table listing alone d…

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  1. 2026-09-30 03:40 · DEV Community — AI
    Your LangChain SQL agent sends the model every table, including the ones that caller can't read

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