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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.219 ·

MCP error escaping, typed telemetry ids and shared version normalisation

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

Under the hood Internal Changes
JSON All of v2.1.219
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.219,
Internal ChangesSection of the release
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 →

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