Auto-naming sessions stopped working around v2.1.60+

Description

Session auto-naming (where Claude Code automatically generates a descriptive session name based on conversation content) stopped working approximately 3 days ago (around Feb 25, 2026). Previously, sessions would get renamed automatically every few minutes as the conversation topic evolved. Now sessions remain unnamed unless manually using /rename.

Environment

• Claude Code version: 2.1.63
• OS: macOS (Darwin 25.3.0)
• Model: Claude Opus 4.6

Steps to reproduce

1. Start a new Claude Code session
2. Have a multi-turn conversation with a clear topic
3. Observe that the session never gets auto-named

Expected behavior

Sessions should automatically receive descriptive names based on conversation content, as they did prior to ~Feb 25.

Actual behavior

Sessions remain unnamed. /rename without arguments works (generates a name from context), but the automatic/periodic renaming no longer fires.

Related issues

• #25090 — Renamed session name disappears after second exit
• #23610 — /rename overwritten after /resume
• #24672 / #22896 — Auto-name sessions feature tracking