Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
ToolsArea: what it touches
Internal ChangesKind: in v2.1.275,
Internal ChangesSection of the release
What
Claude Code's internal cache of which tools are available (the "tool pool") now also takes into account two more factors when deciding whether to reuse a cached result: whether the host has declared it uses the WaitForMcpServers tool, and a "REPL primitive grant" derived from the main agent. Previously the cache only tracked the set of tools and allowed subagent types.
Why
This is an internal correctness fix: without tracking these inputs, the tool pool could theoretically serve a stale cached result when either of these factors changed. It shouldn't be noticeable to users beyond more accurate tool availability.
