What
When you turn auto memory on or off, through the toggle in /memory or by changing the setting, Claude Code no longer writes only autoMemoryEnabled. It also merges an account-related value into your user settings at the same time. This part may not be present in every build of Claude Code.
Why
Your user settings may gain an extra account-related entry when you switch auto memory.
Names in the bundleautoMemoryEnabled/memory
Documented inclaude-code/agent-sdk/claude-code-features
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The writer flagged doubt
What the account-related value holds and what it is used for is not clear.