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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

Claude Code v2.1.280 ·

New telemetry: spilled_bytes on tool output events

Tool output telemetry now reports spilled_bytes, the size of the truncated portion

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
What

When a tool's result is too large and gets "spilled" (truncated, with the rest only retrievable by re-running the tool), the telemetry for that event now records spilled_bytes: the size of the part that was cut off. This is reported alongside the existing flags that mark output as truncated.

Why

This gives better visibility into how much output is being dropped from large tool results, which is useful for diagnosing when important information may have been truncated away.

See this entry in the whole of v2.1.280 →

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