Unclear What difference this makes for a user is unclear.
What
MCP tools are tools provided by outside servers that Claude Code connects to. When such a call is moved to the background automatically, Claude Code now passes along details of the account memory server. Tools of the SDK type also get extra information about their input fields.
Why
This may let calls to an account memory server keep track of which server they belong to after being moved to the background.
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What difference this makes for a user is unclear.