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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 v2.1.224

Subagents cannot call memory_write

You'll notice
Useful3 Signal3
Memory

Only your main conversation can write memory documents; subagents are blocked from memory_write.

What

The new memory write tool was added to the list of memory tools blocked for subagents and custom agents, so only the main conversation can save documents to a memory store.

Evidence

["memory_list", "memory_read", "memory_write"]

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

See this entry in the whole of v2.1.224 →