Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
CompactionArea: what it touches
Internal ChangesKind: in v2.1.317,
Internal ChangesSection of the release
What
Compaction is how Claude Code shortens a long conversation so it fits in the model's memory. When it takes its fallback route, it now checks which skills from MCP servers were loaded and keeps a note of them. Skills are packaged instructions Claude Code can load, and MCP servers are connectors that give it outside tools or data. If that check fails, Claude Code reports an error.
Why
Skills from MCP servers are more likely to remain available after a conversation has been shortened.
