Keybindings

Inside a hosted session (constant host), the default prefix is Ctrl-B. Press it, release, then a key.

Keys	Action
`Ctrl-B` `c`	Continue in Claude Code, refreshing the existing projection
`Ctrl-B` `C`	Create a new Claude continuation
`Ctrl-B` `x`	Continue in Codex, refreshing the existing projection
`Ctrl-B` `X`	Create a new Codex continuation
`Ctrl-B` `:`	Open the Constant command line (`switch claude`, `new claude`, `quit`)
`Ctrl-B` `d`	Detach and exit cleanly
`Ctrl-B` `Ctrl-B`	Send a literal `Ctrl-B` to the child runtime

Lowercase refreshes the existing projection for that runtime; uppercase creates a new continuation. See Carrying a thread for continue vs. new.

Changing the prefix

If you are already inside tmux, Ctrl-B is taken. Pick another:

constant host codex --prefix C-t
CONSTANT_PREFIX=C-t constant host codex

Debugging the prefix

constant keys

This prints the raw bytes for each key. Codex enables the Kitty keyboard protocol, so Ctrl-B can arrive as an escape sequence rather than a raw byte; Constant recognizes both the legacy and Kitty encodings.