Claudee for Desktop](/tools/claude-for-desktop/) on Windows now shows a warning when you resume an old session that's already consumed significant context. The alert tells you how much of your context window — the amount of text Claude can actively hold and reference in a conversation at once — you've already used, so you know before you start typing whether you're working with room to spare or close to the limit.
This matters for heavy users who keep long sessions open across multiple sittings. A resumed session that's nearly full will start losing the thread of earlier parts of the conversation as you keep adding to it. Until now, there was no signal that you were walking into that situation. The new warning surfaces that information at the moment you'd actually use it — before you've already typed several paragraphs and hit a wall.
It's a small UI change with real day-to-day value for anyone doing long research sessions, document editing, or back-and-forth code reviews in Claude. The alternative is discovering mid-task that Claude has dropped context from something discussed an hour ago, which is worse than knowing upfront and starting a fresh session instead.
No formal announcement accompanied the update. It appears to have shipped quietly to the Windows desktop client. No confirmation yet on whether the same warning is coming to macOS or the web interface.