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 v2.1.219 Home All releases olderv2.1.218 v2.1.220newer
Claude Code v2.1.219

Index-based memory recall behind tengu_mill_orange

Not switched on
Useful3 Signal4
Memory Notable

Memory recall could pick documents from a search index instead of asking the model, but it is disabled.

An index-backed recall path with detailed timing telemetry sits behind tengu_mill_orange, which falls back to false.

Feature flag
tengu_mill_orange 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 v2.1.219: 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 v2.1.219. It isn't a statement about your account. What a flag value here can and cannot tell you

What

Memory recall has a new branch that selects documents from a search index rather than asking the model to pick, switched off in this build.

Details
  • The search entry point takes four extra arguments; when the first is true the new branch uses searchMemoryFilesWithIndex in place of the model-driven memory selector.
  • Emits a memory_recall_select event with via_index, candidate_docs, index_query_term_count, index_hit_count, index_below_floor_count, index_top_score, index_relevance_floor, index_loaded_from_disk, index_took_ms, index_store_held, index_open_wait_ms and index_store_open_ms.
  • Failure reasons: index_sweep_incomplete, index_query_failed, below_relevance_floor, no_servable_hits, partially_below_floor, all_filtered.
  • Gated on tengu_mill_orange, whose in-source fallback is false; with it off the old selector path runs unchanged.
Evidence

tengu_mill_orange

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

See this entry in the whole of v2.1.219 →