You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ToolsArea: what it touches
ImprovementsKind: in v2.1.248,
ImprovementsSection of the release
What
When a tool is retracted partway through a conversation, references to it are now filtered by the specific call they belong to rather than by tool name alone, so earlier valid calls to a still-known tool are left intact.
Evidence
Filtering out tool_reference for unavailable tool:
Strings lifted out of the shipped bundle, so the claim above can be checked against them.