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* fix(mcp): synchronize session pool singleton lifecycle Parity follow-up to #3778 (skill storage) and #3730 (sandbox provider). get_session_pool() already serialised creation with _pool_lock, but its fast-path check and final return read the global separately, and reset_session_pool() cleared it with no lock. A reset_mcp_tools_cache() (reachable via the /api/mcp/cache/reset admin endpoint) racing a concurrent get could null the singleton between the None-check and the return, handing the caller None despite the -> MCPSessionPool annotation. Build and return the pool inside _pool_lock with a double check, and clear it under the same lock in reset_session_pool(). The critical section is tiny and never awaits, so holding the threading.Lock is safe from both the async and sync/worker-thread paths. No behavior change for single-threaded callers. Signed-off-by: Yufeng He <40085740+he-yufeng@users.noreply.github.com> * Apply suggestions from code review Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> --------- Signed-off-by: Yufeng He <40085740+he-yufeng@users.noreply.github.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>