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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 v2.1.234

MCP connection telemetry gains negotiation and listen fields

Under the hood
Useful2 Signal3
MCP

MCP connection reports now show when a server skipped protocol negotiation or had listening suppressed.

What

Connection events for MCP servers now record whether negotiation was denylisted and whether listening was suppressed, alongside the existing probe-fallback fields, making it visible when a server skipped protocol negotiation.

Evidence

negotiationDenylisted

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

See this entry in the whole of v2.1.234 →