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.
Screen reader output (for accessibility tools) is now suppressed briefly after startup, preventing the initial UI state from being announced as changes. The quiet duration is controlled by CLAUDE_AX_STARTUP_QUIET_MS (environment variable, optional override of the internal default).
Evidence
Startup quiet timer (search for "srStartupQuietTimer")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.