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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 v2.1.219

MCP error escaping, typed telemetry ids and shared version normalisation

Under the hood
Useful2 Signal0
MCP

MCP server error lines are escaped before display, plus minor telemetry and version-string cleanups.

What

Three small plumbing changes around display escaping and telemetry value typing.

Details
  • Server error lines in the MCP UI pass code, path and message through a sanitising helper before rendering.
  • Prompt-cache diagnosis telemetry wraps requestId and previousMessageId in the typed-value helpers instead of passing raw strings.
  • Version strings in the logging pipeline are normalised via a shared helper rather than an inline regex.
Evidence

tengu_prompt_cache_diagnosis_received

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

See this entry in the whole of v2.1.219 →