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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

Some languages lost their code block display names

You'll notice
Useful1 Signal1
Elsewhere

Code blocks in a few niche languages now show the raw tag instead of a friendly name.

What

The table mapping language tags to friendly names no longer covers Mathematica, ISBL, GML, SQF or 1C:Enterprise, so fenced code in those languages is labelled with the raw tag.

Evidence

mma: "mathematica"

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 →