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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 v2.1.280 ·

MCP connect failure telemetry now includes an extra field via Mae(n)

MCP connect-failure telemetry now includes an extra data field

Under the hood Internal Changes
JSON All of v2.1.280
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
TelemetryArea: what it touches
Internal ChangesKind: in v2.1.280,
Internal ChangesSection of the release

Unclear What data the added field actually carries is not specified in the evidence.

What

When a connection to an MCP server (a way Claude Code connects to external tools and data sources) fails, the telemetry events sent for it (mcp_connect_failed, mcp_connect) now include an additional set of fields drawn from a new source, alongside the fields already collected.

Why

This gives more detail to diagnose why MCP connections fail, though the finding does not specify what the new fields contain.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhat data the added field actually carries is not specified in the evidence.

See this entry in the whole of v2.1.280 →

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