Here's a conversation I had with my coding agent three times in one week:

Me: The DEV.to API 403s us.

Agent: Let me add a User-Agent header — their bot filter rejects the default one.

Me: Right. We figured that out on Monday. And Tuesday.

The agent was correct every time. It was also starting from zero every time. Monday's hard-won lesson — dev.to blocks the default user agent — evaporated the moment the session closed. Wednesday-me paid the same debugging tax as Monday-me.