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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 v2.1.41

Enhanced Memory System Guidance [Gradual Rollout]

What

Detailed instructions for Claude on when and how to use the persistent memory directory.

Details

The new guidance includes:

  • When to access memories: When memories are relevant, user refers to prior work, or explicitly asks to recall
  • When to save memories: Project context, user preferences, debugging insights, architectural decisions
  • What to save: Patterns, conventions, user workflow preferences, recurring problem solutions
  • What NOT to save: Ephemeral task details, duplicate information contradicting CLAUDE.md
  • Memory hygiene: Remove outdated info, organize by topic not chronologically, use separate topic files
Status

Controlled by tengu_mulberry_fog feature flag (defaults to disabled)

Evidence

Memory guidance system (search for "You MUST access memories when")

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 v2.1.41 →