What
Claude Code can keep memories, saved notes stored as files, and it uses a prompt to pick which of them matter for the current task. That prompt now ends with an instruction to reply with only a JSON object (a simple structured text format) of the form {"selected_memories": ["<filename>", ...]}.
Why
Asking for one fixed format changes how the choice of memories comes back, which may make that choice more reliable to read.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear whether a formal output format is also enforced alongside the written instruction.