Bug: /resume does not update sessions/{pid}.json sessionId
증상
When using /resume inside an already-running Claude Code session to switch to a different conversation, the ~/.claude/sessions/{pid}.json file is not updated with the new session ID. This causes external tools and hooks to have an incorrect view of which session a process is operating on.
원인
Agent encountered an unexpected state or unhandled error condition outside the standard error handling path.
해결법
Currently, users must manually /exit the original session before resuming it from another window or tool. A SessionStart hook can detect and kill conflicting processes, but only for claude --resume from the shell — not for /resume within an existing session, because the session file is stale.
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/37737
Source: https://github.com/anthropics/claude-code/issues/37737
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