2026-04-27 · ~6 min

Why every AI session forgets your project

Last week I switched from Claude Code to Codex CLI for one task. Spent fifteen minutes re-explaining the project. Switched back. Re-explained again. That's when it clicked: the bottleneck isn't the AI's reasoning, it's the cold-start tax we pay every single session.

The cold-start tax

Every fresh AI session is amnesia by default. Same architecture you described yesterday, same constraints, same gotchas. If you use one tool, it stings. If you use five (Claude Code, Codex CLI, OpenCode, Pi, Copilot), it compounds.

The fix is structural

Stop trying to make any one AI remember. Make the project remember. A vault — markdown, version-controlled, your machine — becomes the source of truth. Every AI tool reads it on start. Context loss goes from default to impossible.

That is VibeCoderKit

One vault. Many AI tools. Zero context loss. Try it.