Status line context % does not refresh after /compact until next assistant turn

Summary

After running /compact, the context-% indicator shown in the status line continues to display the pre-compact value. It only updates once the next assistant turn produces a fresh API response.

Expected

/compact materially changes the context size, so the status line should reflect the post-compact value immediately (or at least on the next refreshInterval tick, if one is configured).

Actual

• context_window.used_percentage on stdin is derived from the most recent API response.
• refreshInterval re-runs the script on a timer, but passes the same stdin JSON snapshot each tick — it does not force fresh token accounting.
• Documented refresh triggers are: "after each new assistant message, when the permission mode changes, or when vim mode toggles." /compact is not listed, and the docs are silent on whether compaction should trigger a refresh.
• Net effect: the percentage stays stuck at the pre-compact value until the user sends another message, which is misleading because /compact is precisely the moment one wants to see the new value.

Repro

1. Work a session up to, say, 70% context.
2. Run /compact.
3. Observe the status line — still shows ~70% (or whatever the pre-compact value was), despite /context reporting a much lower number.
4. Send any message; the status line updates on the resulting assistant turn.

Suggested fix

Treat /compact as a status-line refresh event, and/or update context_window.* stdin fields immediately after compaction (not only on the next API response).

Environment

• Claude Code CLI, Opus 4.7 (1M) session
• macOS 15.4 (Darwin 25.4.0), zsh
• Status line: custom bash ~/.claude/statusline-command.sh, previously refreshInterval: 3 (removed after confirming it has no effect on this)

Related

• Docs: https://code.claude.com/docs/en/statusline
• #44794 (different status-line bug: percentage intermittently disappears)