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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 v2.1.242

Command-line system prompts kept separate from resolved ones

Under the hood
Useful2 Signal3
System Prompts

Your typed --system-prompt values are kept apart from the resolved ones for cloud and remote setup.

--system-prompt--append-system-prompt
What

A session now carries the --system-prompt and --append-system-prompt values you typed alongside the finally-resolved prompts, so cloud and remote session setup can tell which came from your command line.

Evidence

appendSystemPrompt: e.appendSystemPromptCli

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.242 →