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

Claude Code v2.1.247 ·

Telemetry bodies padded with random whitespace before compression

Telemetry requests get random padding so their compressed size hides the real payload length.

Under the hood Internal Changes
JSON All of v2.1.247
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
TelemetryArea: what it touches
Internal ChangesKind: in v2.1.247,
Internal ChangesSection of the release
What

Compressed telemetry requests now get a newline and a random run of 0 to 256 spaces or tabs appended first, so the compressed size no longer reveals the exact payload length. Only on the gzip path.

Evidence

Math.random() < 0.5 ? " " : "\t"

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

See this entry in the whole of v2.1.247 →

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