[BUG] CLAUDE_AUTOCOMPACT_PCT_OVERRIDE not triggering at configured threshold (v2.1.156)

What's Wrong?

CLAUDE_AUTOCOMPACT_PCT_OVERRIDE=60 is set via ~/.claude/settings.json env section but auto-compaction does not trigger at 60% context usage. The main session reached 72% without triggering compaction. The env var is confirmed loaded (echo $CLAUDE_AUTOCOMPACT_PCT_OVERRIDE outputs 60).

This is a follow-up to #36381 (closed & locked). The issue was reported on v2.1.79 and is still present in v2.1.156.

What Should Happen?

Auto-compaction should trigger when context window usage reaches ~60%, as configured by CLAUDE_AUTOCOMPACT_PCT_OVERRIDE.

Steps to Reproduce

1. Set CLAUDE_AUTOCOMPACT_PCT_OVERRIDE to "60" in ~/.claude/settings.json under the "env" key:

{
  "env": {
    "CLAUDE_AUTOCOMPACT_PCT_OVERRIDE": "60"
  }
}

1. Restart Claude Code
2. Verify env var is loaded: echo $CLAUDE_AUTOCOMPACT_PCT_OVERRIDE → 60
3. Use the session until context exceeds 60%
4. Observe that auto-compaction does not trigger at 60%

No other compaction-related env vars are set (CLAUDE_CODE_AUTO_COMPACT_WINDOW, CLAUDE_CODE_MAX_CONTEXT_TOKENS, DISABLE_AUTO_COMPACT, DISABLE_COMPACT are all empty).

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

Additional Information

• Claude Code Version: 2.1.156
• Claude Model: Opus
• Platform: Anthropic API
• Operating System: Windows
• Terminal/Shell: Windows Terminal / bash
• Is this a regression?: I don't know
• Workaround: manually run /compact to trigger compaction