To give you an example, consider Stripe Sigma. This product is a nice new SQL query system for your Stripe DB. It has a little LLM built into it to help you write queries. The LLM is not very good. I want Claude Code or Codex writing my queries. But Stripe launched a fancy Sigma UI with an integrated helper before their API. There is a private alpha for the SQL REST endpoint that I do not have access to yet. So instead I had my agent do ETL-from-scratch: it used the standard Stripe APIs to query everything about my account, build a local SQLite DB, and now my agent queries against that far better than Sigma can.

This. It's what my LLM implementations do every day, all day (while having credits.)