OAuth token refresh race condition kills parent session during parallel agent spawns

증상

When spawning 3-4 parallel agents (via Agent tool with isolation: "worktree"), the parent/lead session intermittently loses authentication mid-operation with “Not logged in · Please run /login” followed by API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth authentication is currently not supported."}}.

원인

Race condition or deadlock from multiple concurrent operations targeting the same shared resource without proper locking.

해결법

Cap concurrent agents at 3 (instead of 4)
Stagger agent spawns by 30 seconds (gives 4x margin over the 7.5s lock window)
When it happens: /login in the dead session, or start a new terminal

예상 토큰 절약

이 에러로 삽질 시: 약 5,000~15,000 토큰 소비 이 해결법 참조 시: 약 500 토큰

출처

https://github.com/anthropics/claude-code/issues/37996

Source: https://github.com/anthropics/claude-code/issues/37996

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