Source Intelligence

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.

All of v2.1.212 Home All releases olderv2.1.211 v2.1.213newer
Claude Code v2.1.212

Persistent File-Based Memory (tengu_stone_shell) [Gradual Rollout]

Feature flag
tengu_stone_shell Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.212: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.212. It isn't a statement about your account. What a flag value here can and cannot tell you

A new memory system gives Claude a persistent, file-based scratchpad stored in a configurable memory directory. Information saved there carries over to future sessions.

Details
  • Enabled by the tengu_stone_shell feature flag.
  • Claude receives detailed guidance on what makes a good memory: applicable (prevents repeated mistakes), durable (recurring workflows), and legible (self-contained, full sentences).
  • Claude is instructed to write memory before the end of any turn where the user corrects it or it discovers something new about the environment.
  • Memory files use markdown with frontmatter (name, description keys).
  • This is separate from the existing #/memory shortcut system; it's a lower-level persistent layer.
Evidence

"You have a persistent, file-based memory stored at {memory_dir}." (search for "TVh" or "tengu_stone_shell")

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

See this entry in the whole of v2.1.212 →