When you tag a file with @ in Claude Code, the file's content goes into the conversation, as long as it fits the Read tool's limit of 25,000 tokens by default. Tag a few big files and a lot of your chat is files you may not have needed.
Here's the setting that changes it, how to turn it on, and what you give up.
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Get the full setup steps + the copy-paste setup prompt
The rest of this guide (5 more sections, 1 copy-paste prompt) opens right here. The setup prompt, one paste into Claude that sets it all up, comes by email only. Use your real address.
Unlocks: Step 1: update Claude Code · Step 2: turn it on · What changes · The catch · Sources
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