Claude -p (print mode) is non-interactive but retains full tool access
(Edit, Write, Bash, etc.) with --dangerously-skip-permissions. Removing
-p caused Claude to enter interactive mode which requires a TTY and
produces zero output when run as a subprocess with piped I/O.
Now delivers prompt via stdin for both Claude and Codex in agentic mode.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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