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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 v2.1.221 ·

Background-session pin store drops its legacy sidecar migration

Background sessions pinned only by the very old marker file will no longer show as pinned.

You'll notice Removed
JSON All of v2.1.221
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
SessionsArea: what it touches
RemovedKind: in v2.1.221,
RemovedSection of the release
What

Reading the pinned-session set no longer falls back to scanning background session directories for an old marker file.

Details
  • previously, a missing pins file triggered a scan for a legacy "pinned" marker per session, migrated the result into the pins file, and fired a dead-probe event
  • now a missing pins file just writes an empty list and returns an empty set; the probe event no longer exists in the build
  • sessions pinned only by the old sidecar marker would no longer be recognised
Evidence

pins.json

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

See this entry in the whole of v2.1.221 →

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