We spent a year teaching coding agents to remember things. Remembering turned out to be the easy part. The hard part is knowing which of those memories are still true.
Here's the failure that finally got me.
A guess, promoted to a fact
I told Cursor my project had switched from npm to bun. Later, over in Claude Code, the agent confidently ran npm install and spent a while debugging a build that was never going to work. The "we use npm" belief had outlived the truth — and nothing flagged it, because to the agent it looked exactly like every other fact in memory.
Same shape as the classic one: "we use Jest" survives a migration to Vitest, and three sessions later an agent is cheerfully writing Jest tests for a repo that doesn't have Jest anymore.
