Auto-Compact Interactive Configuration (/autocompact)

What

A new slash command with both interactive slider UI and text-mode for configuring the auto-compact window size.

Usage

/autocompact           # Opens interactive slider dialog
/autocompact 500k      # Sets window to 500,000 tokens
/autocompact auto      # Resets to automatic (recommended)

Details

Interactive mode: slider with up/down arrows, wrapping to "Auto" at boundaries
Accepts token values in various formats: 500k, 200000, 200 (shorthand for 200,000), range 100k-1M
Reset with: auto, reset, unset, or default
Displays current window size, source (env var, settings, or auto), and whether it's capped by the model limit
Shows warnings when: auto-compact is disabled, env var CLAUDE_CODE_AUTO_COMPACT_WINDOW takes precedence, or when overriding auto
Strongly recommends the auto setting: "The auto setting picks a window tuned for your model and is strongly recommended for the best cost and performance."

Evidence

Auto-compact configuration (search for "Auto-compact Window", "Configure the auto-compact window size", "CLAUDE_CODE_AUTO_COMPACT_WINDOW")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.119 →

The build it came inv2.1.119

23 Apr 2026 · 35 entries, this one is #14.

Either side of it

v2.1.118Older
v2.1.120Newer

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Names in this entry

slash/autocompact
Set the auto-compact window: how full the context window gets before Claude Code compacts automatically. Pass a size such as 500k, or auto to return to the window tuned for your model. Claude Code saves the value to user settings and applies it to the current session. See Set the auto-compact window for accepted values and what overrides it. Without an argument, opens a dialog that shows the current window. Requires Claude Code v2.1.221 or later
settingauto
You can set the auto-compact window at launch with --autocompact, using auto or 100k to 1M.
settingunset
The cross-session remote-control bridge stays off unless the server enables it; its state shows in debug output.
settingdefault
Subagent nudging behaviour can be picked per model, but the whole feature stays behind a gate.
envCLAUDE_CODE_AUTO_COMPACT_WINDOW
Set the auto-compact window in tokens, from 100000 to 1000000. Accepts a plain integer such as 500000 only: a value like 500k reads as 500 and clamps to the 100K minimum. The effective window is also capped at the model's context window. Takes precedence over the /autocompact command, the --autocompact flag, and the autoCompactWindow setting. The status line's used_percentage always measures against the model's full context window, so once this variable is set, that percentage no longer indicates when compaction will run

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