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All time, since Oct 11.

Nested agents read piped script stdin

“Each print-mode session read the rest of the script as part of its prompt and, in the owner's auto permission mode, treated it as instructions.”

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I hit this bug: rapsheet.dev/sheets/claude-code/issues/11398/file
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Nested agents take piped script as instructions via stdin. Happens when claude -p or claude --bg runs inside a script fed to bash on standard input, stdin left attached.

Is this your bug?

File my report
Where
print and background modes
Versions
2.1.296
How bad
Security risk: something exposed, or done without permission.

Not quite your bug?

  1. Short options despite long-form rule1 person
  2. Unverified search claims stated1 person
  3. Writes temp files against rule1 person

Original reports2, newest first

  1. Ran claude -p inside a script fed on standard input; print-mode agents took the script as instructions, ran copies of it, and started more agents#101389
  2. Ran claude --bg with no prompt inside a script fed on standard input, so a background agent took the script as its instructions#101388

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