Most people use Claude Code until the context window fills up & the quality degrades.

Engineers at Amazon, Google, Shopify don't do that.
They spawn parallel research agents, create atomic task plans with XML structure Claude actually understands, execute in fresh 200k context windows per task, commit every task to git automatically.
Main context window stays at 30-40% the entire time. No degradation. No "oops, you're right!" responses from Claude. Just clean execution.
The difference between using a tool & actually deploying it at scale is knowing how to prevent the thing from breaking under load.