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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 v2.1.232 13 Aug 2026

Oversized metadata from MCP tool results is dropped

You'll notice

Useful2 Signal1

MCP

Empty or oversized metadata on MCP tool results is now dropped rather than forwarded.

What

Extra metadata attached to an MCP tool result is now forwarded only when it is present and small enough; empty metadata is dropped and oversized metadata is discarded by serialized length.

Details

When metadata is discarded, the fixed end-turn marker claude/endTurn still survives as a fallback.

Evidence

claude/endTurn

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

See this entry in the whole of v2.1.232 →