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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

Only a fixed list of settings is allowed to travel to a cloud session

You'll notice
Useful3 Signal3
Cloud Sessions

Only a short allowlist of your settings is sent to a cloud session; the rest stays local.

What

When local settings are forwarded to a cloud session, everything outside an allowlist is withheld: language, outputStyle, attribution, includeCoAuthoredBy, includeGitInstructions, alwaysThinkingEnabled, showThinkingSummaries and permissions are the only keys that travel, with attribution narrowed further to commit, pr, sessionUrl and commitTrailers.

Details
  • Any other key makes the bundle refused with the reason not_portable_key; exceeding the key-count or key-length caps gives over_bounds.
  • The receiving side counts what was left out and reports it as withheldKeys / settingsKeysWithheld.
  • Other send-side refusals: settings_unreadable, nothing_to_send, schema_rejected and settings_too_large.
Evidence

includeGitInstructions

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

See this entry in the whole of v2.1.242 →