Unclear Nothing shows what, if anything, supplies the delay, so it is unclear whether any user's notices are actually held back.
What
MCP tools are tools provided by outside programs connected to Claude Code. When one of them takes a long time, Claude Code can move it to the background automatically and tell you when it finishes. Before, that "finished" notice was always sent straight away.
The notice can now be passed to an optional check that decides when to send it. The notice is still sent immediately when no such check is in place, or when the check fails.
Why
This prepares for notices about background MCP tools arriving later rather than the moment the tool finishes. When nothing is set up to delay them, notices arrive as before.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
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Nothing shows what, if anything, supplies the delay, so it is unclear whether any user's notices are actually held back.