Unclear It does not say what makes a worker one where only the session stream may deliver input.
What
Standard input is the channel a program reads typed or piped text from. Claude Code now filters what arrives there when it runs as a remote worker. On some workers, only the session stream, the connection that carries the session itself, may deliver input. A line that arrives on standard input on such a worker is dropped, and Claude Code logs a warning saying it dropped a line and did nothing with it.
Why
This stops a remote worker from acting on text pushed in through the wrong channel, which makes it harder to slip commands into a worker from outside the session.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It does not say what makes a worker one where only the session stream may deliver input.