Limits
These are the fixed limits you can run into. The app tells you when you reach one.
Messages and attachments
Section titled “Messages and attachments”- A message can be up to 6,000 characters. A counter appears as you get close.
- You can attach up to 4 files to a message, 3 MB each.
- An answer you type to an agent’s question can be up to 6,000 characters.
- The context you pass with Continue with another agent can be up to 6,000 characters.
Sessions
Section titled “Sessions”- Claude Code waits up to 24 hours for your answer to a question. After that, it stops waiting for that answer.
- A session holds up to 10,000 messages.
- A session name can be up to 120 characters.
- The sessions list shows your newest 500 sessions, plus every pinned session.
- When you look for existing sessions on a computer, the results can be opened for 2 minutes. After that, refresh the list.
- A Claude Code session that sits idle for 30 minutes stops its Claude Code process. Your next message resumes the conversation.
- A note can be up to 6,000 characters.
- You can keep up to 2,000 notes across all your repositories and folders. At the limit, the app says: “You have 2000 notes, the most you can keep. Delete notes you no longer need, then add this one.”
Notifications and devices
Section titled “Notifications and devices”- An agent can send at most one attention notification per session per minute.
- The Notifications page lists your newest 100 notifications.
- Your account can have up to 20 devices. Each browser or Home Screen app where you send messages or turn on notifications counts as one. At the limit, the app says: “You have 20 devices registered, the most allowed. Remove a device you no longer use, then sign in here again.” The app has no control for removing a device yet; get in touch if you reach it.
Connecting a computer
Section titled “Connecting a computer”- A pairing code works for 10 minutes. While the installer waits, it shows a new code each time one runs out, for up to an hour.
- Free includes 1 connected computer and Pro up to 5. See Plans and billing.
Previews
Section titled “Previews”- A preview closes 4 hours after the agent opens it.
- Free keeps 1 preview open at a time. Pro has no limit. See Plans and billing.
Account
Section titled “Account”- The code in your verification email works for 1 hour.
- You can ask for a new verification code after 60 seconds.
- Each network gets 10 attempts every 15 minutes, shared across signing in, creating an account, entering a verification code, sending a new code and resetting a password. After that, the app tells you how long to wait, for example “Too many attempts from this network. Try again in 12 minutes.”