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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 v2.1.120

memory-types Skill

What

A new internal skill that provides a full reference for the memory type taxonomy — what each type captures, when to save it, and how to structure the body.

Details
  • Not user-invocable directly; Claude uses it automatically before writing a memory file when lean prompts are active
  • Enabled when tengu_ochre_finch flag is active or CLAUDE_CODE_LEAN_PROMPT is set
  • Replaces the longer inline memory documentation in the system prompt with a shorter summary plus a skill reference
  • The system prompt now lists memory types as a compact bulleted list and says "Invoke the memory-types skill for scope, body structure and examples"
Evidence

Skill registered as "memory-types" with userInvocable: !1 — search for "memory-types"

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

See this entry in the whole of v2.1.120 →