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Reading a new release v2.1.251 Analysing changes · 2/5 Analysis pass · 14/27 agents ~3-4 min left 232 findings $6.28 so far

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 / CLI flags

attach

A Claude Code CLI flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

What it is

Attaching to a background session now times how long it takes to paint and reach an idle prompt.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.221.

Presence across releases

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Changelog entries naming it

  1. v2.1.248claude attach explains cleaned-up background sessions instead of failing generically

    Reopening a cleaned-up background session now points you at claude rm and claude respawn.

    named in this entry

  2. v2.1.247claude attach tells you whether the terminal host died or just never answered

    Attach failures now distinguish a dead terminal host from a silent session, and offer the right recovery.

    named in this entry

  3. v2.1.221claude attach now measures time-to-interactive

    Attaching to a background session now times how long it takes to paint and reach an idle prompt.

    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.

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 CLI flag does. All CLI flags.