Bug: Repeated /login prompts during active session (OAuth, macOS)

Bug: Repeated /login prompts during active session

Environment:

• Claude Code 2.1.81 (native install)
• macOS 26.3.1 (Darwin 25.3.0)
• Auth: OAuth (no API key, no env vars)
• Keychain: Claude Code-credentials entry exists

Behavior:

• During active sessions (2-4 hours), Claude Code repeatedly prompts to /login
• No clear trigger — happens during normal conversation, not correlated with sleep/lock
• Session involves heavy parallel agent usage (3-5 worktree agents running concurrently)
• After /login, works for a while, then prompts again

Diagnostics:

• /doctor: clean (no issues reported)
• No ANTHROPIC_API_KEY or ANTHROPIC_AUTH_TOKEN env vars set
• No apiKeyHelper configured
• System clock is correct
• Keychain entry for Claude Code-credentials is present
• No .credentials file on disk (macOS uses Keychain)

Frequency: Multiple times per session (every 30-60 minutes approximately)

Reproduction:

1. Start Claude Code with OAuth login
2. Run a long session with multiple parallel worktree agents (3-5 concurrent)
3. After ~30-60 minutes, Claude Code prompts for /login again
4. /login succeeds, then the cycle repeats