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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.

← All of v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

MCP request detection moved into a shared helper

Under the hood
Useful1 Signal0
MCP

The check for whether an MCP message is a request moved into one helper.

What

The inline test for whether a message from an MCP server is a request rather than a response is now a single named function. No behavior changes.

Evidence

if (xot(r.message))

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

See this entry in the whole of v2.1.251 →