Statusline disappears during rapid permission prompts

Description

Custom statusline disappears during heavy tool use with rapid permission prompts (yes/no confirmations) and sometimes doesn't return until context compaction.

Steps to Reproduce

1. Configure a custom statusline in .claude/settings.json:

``json
"statusLine": {
"type": "command",
"command": ".claude/statusline.sh",
"padding": 0
}
``

1. Run a task that triggers many sequential tool calls requiring permission (e.g., building multiple files, batch operations)
2. Observe statusline during rapid yes/no prompts

Expected Behavior

Statusline should remain visible and update during interactive permission flows.

Actual Behavior

Statusline disappears during rapid permission prompts and may not return until:

• A longer pause in activity
• Context compaction occurs

Environment

• Claude Code version: Current (Jan 2026)
• OS: macOS Darwin 25.3.0
• Model: Opus 4.5

Analysis

• Custom statusline script executes in ~24ms (well under 300ms limit)
• Script outputs correctly to stdout
• Issue appears to be that "conversation message update" events (which trigger statusline refresh) aren't firing during permission prompt flows

Feature Request

Consider adding a refresh_interval option to statusline config for time-based refresh independent of message events:

"statusLine": {
  "type": "command",
  "command": ".claude/statusline.sh",
  "refresh_interval": 1000
}

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