A rebuilt chat

Chat has been rebuilt from the composer up. Every tool call the agent makes now renders — not just code execution — and reasoning streams as the agent thinks rather than appearing after the fact. Reloading a conversation replays it in the order it actually happened, text then tool then text, instead of collapsing into a summary that didn't match what you watched.

You can attach images and PDFs to a message and the model sees them in the same turn, with an explicit tool for keeping an attachment in a brain rather than having it silently vanish when the conversation ends.