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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 v2.1.223

Memory tools are now off-limits inside subagents

You'll notice
Useful3 Signal0
Subagents not in their notes

Subagents can no longer list or read memory files; those tools are stripped from their toolset.

memory_listmemory_read
What

memory_list and memory_read can no longer be used from within a subagent.

Details
  • both were added via a shared list spread into the disallowed-tool set builder, landing in ALL_AGENT_DISALLOWED_TOOLS and CUSTOM_AGENT_DISALLOWED_TOOLS
  • tools in that set are filtered out of any agent's tool pool
  • if a subagent definition still names one, the model is told the tool is not available inside subagents
Evidence

Complete the task with the tools provided and return findings to the orchestrator.

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 v2.1.223 →