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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

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.

Reference / Environment variables

CLAUDE_AX_PREPARK_MS

A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.233, including the newest one read.

What it is

In [screen reader mode](/docs/en/accessibility#what-your-screen-reader-hears), how many milliseconds Claude Code waits, with the cursor at the start of the line, before it writes a new or changed line. Default 50. Set 0 to write immediately. Claude Code caps the wait at 5000. Requires Claude Code v2.1.233 or later

Anthropic's own wording. Read off Environment variables, captured 2026-08-28.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.233 – 2.1.243 11 releases in the build int —

A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.

Changelog entries naming it

  1. v2.1.233Screen-reader mode pauses before redrawing

    Screen-reader mode waits briefly before redrawing so bursts are announced once; tune the delay with an env var.

    named in this entry

Documentation pages

A reference table page is one whose own table defines this name, and it is where the description above came from. A page that mentions it carries the name somewhere in its text and may say nothing about it at all. Every page carrying it.

Names beside it

Every environment variable in the inventory starting claude_ax, up to twelve of them.

CLAUDE_AX_SCREEN_READERSet to 1 to render screen-reader friendly output: flat text without decorative borders or animations. Set to 0 to force screen-reader mode off even when [axScreenReader](/docs/en/settings-reference#axscreenreader) is true. The [--ax-screen-reader](/docs/en/cli-reference#cli-flags) flag takes precedence. Requires Claude Code v2.1.181 or later 2.1.181 CLAUDE_AX_STARTUP_QUIET_MSIn [screen reader mode](/docs/en/accessibility), how many milliseconds Claude Code holds the first interface render after the startup confirmation line, so your screen reader can speak the line in full before new output interrupts it. Default 3000. Set 0 to render immediately. Claude Code caps the hold at 600000 (10 minutes). Your first keystroke ends the hold early. Requires Claude Code v2.1.217 or later 2.1.217

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the environment variable does. All environment variables.