MCP on_session_start lifecycle hook for session context restoration
증상
When a session starts (new or resumed) with a remote MCP server configured, there’s no way for the MCP server to proactively provide context to the session. The session has to know what to search for, but a just-started session doesn’t know what it doesn’t know.
원인
OpenClaw gateway, skill, or agent configuration issue — root cause confirmed in the openclaw/openclaw issue tracker.
해결법
Sessions must be instructed (via CLAUDE.md or human prompting) to call specific MCP tools at startup. This is fragile — new sessions don’t know what to call, and the instructions add to the system prompt size.
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/38095
Source: https://github.com/anthropics/claude-code/issues/38095
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