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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 v2.1.228

Agent session stream passes through plain tool results

Under the hood
Useful2 Signal2
Agents

Managed agent sessions now pass through plain tool results, not just custom tool events.

What

The event filter on the managed agent session stream now accepts user.tool_result alongside the custom tool result events it already allowed, and the session tool runner emits and reads that shape when reporting results from non-custom tools.

Evidence

"user.tool_result"

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 v2.1.228 →