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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.118

--plan-mode-instructions CLI Flag

What

A new CLI flag that lets users customize the plan-mode workflow instructions.

Usage
claude --print --plan-mode-instructions "Custom workflow instructions here"
Details
  • Replaces the default code-implementation phases in the plan-mode system reminder
  • The read-only enforcement preamble and ExitPlanMode protocol footer are always kept
  • Can only be used with --print mode; using it otherwise produces: "Error: --plan-mode-instructions can only be used with --print mode."
  • Also exposed as an agent frontmatter field planModeInstructions for programmatic configuration
Evidence

CLI option definition (search for "--plan-mode-instructions") and enforcement (search for "can only be used with --print mode").

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.118 →