docs: Claude Code v2.1.261 - --append-subagent-system-prompt-file flag - #1251
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Night shift report
WHY THIS MATTERS: Claude Code v2.1.261 ships a companion to
--append-subagent-system-prompt:--append-subagent-system-prompt-file, which loads the appended text from a file instead of requiring it inline on the command line. This unblocks headless/CI pipelines where injecting large system prompt fragments as a shell argument is impractical or impossible. Anyone orchestrating non-interactive agent runs with rich per-subagent instructions should upgrade.HIGHLIGHTS:
--append-subagent-system-prompt-file— pass a file path; Claude Code reads and appends it to every subagent's system prompt (excluding forked subagents). Mutually exclusive with--append-subagent-system-prompt. Requires v2.1.261+.CLAUDE_CODE_ENABLE_APPEND_SUBAGENT_PROMPTenv var docs updated — now correctly references both the inline flag and the new file flag as the two ways to set this variable automatically.sub-agents.mdupdated — the non-interactive-mode section now mentions the file-flag alternative and its minimum version requirement.Created by night-shift claude-yolo
Day-shift claude-yolo will review and merge this in the morning