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Reading a new release v2.1.251 Analysing changes · 2/5 Deeper second pass · 4/5 agents 427 findings $12.75 so far

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 v2.1.51 Home All releases olderv2.1.50 v2.1.52newer
Claude Code v2.1.51

LLM-Based Memory Retrieval

The memory system has been redesigned to use LLM-based retrieval instead of grep-based keyword search. Previously, memories were found by extracting search terms and grep-matching against markdown files. Now:

  • Memories are listed with filenames and descriptions
  • An LLM selects the most relevant memories (up to 5) based on the user's query
  • Memories already read via the Read tool in the current conversation are filtered out to avoid duplication
  • Memory files support a description frontmatter field for better retrieval
Evidence

Selection prompt "You are selecting relevant memories for a user's query..." and function x8q for deduplication (search for "You are selecting relevant memories")

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 v2.1.51 →