DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.
Claude Code now queries the terminal emulator for its identity using the XTVERSION escape sequence. This can be used to tailor behavior to specific terminals. If the terminal ignores the query, it logs "XTVERSION: no reply".
Evidence
Terminal identification (search for "XTVERSION")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
