You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Remote ToolsArea: what it touches
ImprovementsKind: in v2.1.307,
ImprovementsSection of the release
What
A tool call is a request from Claude to run something, such as a command or a file read. When a tool call is never actually sent, Claude Code gives Claude a stand-in error result so the conversation can carry on.
That error now depends on where the call was meant to run. For calls on your own device, Claude Code uses a fixed message. Previously the message always came from the host, the program Claude Code is running inside.
Why
This changes the wording Claude sees when such a call fails, which can affect how it explains or retries the failed step.
