When a team memory index file is approaching or exceeding its read limit (configurable via promptIndexMaxBytes), Claude now surfaces a contextual warning during reads:
The memory index at team/[mount]/[path] is [size], approaching the [limit] read limit — content beyond that is dropped when this index is loaded. Compact it to under [target] now: keep one line per entry, move detail into topic files, and merge or drop stale entries.
Evidence
New FXa() function — search for "Compact it to under" and "approaching the" with "read limit"
Strings lifted out of the shipped bundle, so the claim above can be checked against them.