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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 7 Aug 2026

MCP connection failures report a sibling probe result

Under the hood

Useful2 Signal2

MCP

Failed MCP connections now report an extra probe result for easier diagnosis.

What

The telemetry event for a failed MCP server connection carries one more field describing the probe, giving more detail when a server will not connect.

Details

probeSibling joins the existing negotiationMode, probeFellBack, errorCode and errorClassName fields.
The field name does not appear in the previous build.

Evidence

probeSibling

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 →