Unclear What a plugin "slot" contains or is used for is not stated.
What
When Claude Code assembles settings contributed by plugins, it now includes a payloadSlots map, built from each plugin's slot entries, alongside the existing shellSettings, envVars, sandboxSettings, and hooks fields. A new helper checks whether any slots are non-empty to decide whether a plugin's settings count as meaningful ("non-trivial").
Why
The finding does not say what a plugin "slot" holds or what it is used for, only that plugins can now contribute this additional kind of data and that it factors into whether a plugin's settings are considered non-trivial.
Names in the bundlepayloadSlots
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What a plugin "slot" contains or is used for is not stated.