Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
CompactionArea: what it touches
Internal ChangesKind: in v2.1.323,
Internal ChangesSection of the release
What
The Agent tool lets Claude hand a task to a subagent, a separate helper copy of Claude. When a conversation grows too long, Claude Code compacts it, which means summarising earlier parts to free up space. The prompt used for that step carries its own copy of the Agent tool's description.
That copy now says the available agent types are listed in "messages from the system" in the conversation, instead of in "system-reminder" messages.
Why
Changing Claude's instructions can change how it behaves. Here only the name for where the agent types are listed changed.
