Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
System PromptArea: what it touches
Internal ChangesKind: in v2.1.275,
Internal ChangesSection of the release
What
The internal function that builds the system prompt's tool-context section can now describe tool removals as well as additions. It emits tool_removal entries (referencing the tool by name) ahead of any tool_addition entries, and callers now pass a list of removed tools alongside the list of added ones.
Why
This lets Claude's system prompt explicitly note when a tool has been taken away during a session, not just when one is added, which should help Claude stay accurate about which tools are currently available.
