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Node.js MCP servers (npx/bunx) were being OOM-killed (return_code=137) by the default 512MB nsjail cgroup_mem_max. Node V8 reserves large virtual address space and instantiates WebAssembly modules (undici llhttp) on startup, easily exceeding 512MB resident. This caused every node-based MCP (memory, sequential-thinking, filesystem, weather, docker, excel) to crash-loop. Fix: when the stdio command is npx/bunx/pnpm, default memory_mb to 1024 unless the operator explicitly set a value. Python/uvx servers keep the 512MB default. Co-authored-by: dadachann <[email protected]>