What
Claude Code now sends a new header, x-claude-code-tunnel-credential-epoch, on tunnel connections. A header is a small labelled piece of information sent with a network request, and a tunnel is a connection that links a session to Claude Code running elsewhere. A lock check also now reports that the lock changed when the lock file's last-modified time differs from the one it was watching.
Why
This affects how Claude Code handles one copy of a remote or tunnel session taking over from another.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear which feature uses the new header and lock check.