Connectors are tools from claude.ai that Claude Code can use. Some connector tools take a file as one of their inputs. For these, the model can now give the path of a file on your computer, and Claude Code sends the file itself, not the path. The model is told: "Give the path of a file on this computer. The file itself is sent, not the path."
If a call would send the path as plain text instead of the file, Claude Code refuses it. The error explains that no file was sent and the tool was not called.
The feature is off unless it is switched on remotely. It is always off in remote sessions and in environment sessions. A small per-turn count of uploads that the headless runner used to keep has been removed. The headless runner is the mode that runs Claude Code without the interactive screen.
Connectors that work on files can now get the real file from your machine. The refusals stop a file path from being sent to a connector as text by mistake, where it would be useless or would reveal your folder layout.
tengu_steady_quail Not enough to sayNothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.
This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.319: off
These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.
Read once, for one account on one subscription tier, against v2.1.319. It isn't a statement about your account. What a flag value here can and cannot tell you