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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

← All of v2.1.221 Home All releases ←olderv2.1.220 v2.1.222newer→

Claude Code v2.1.221 3 Aug 2026

Background-session pin store drops its legacy sidecar migration

You'll notice

Useful3 Signal0

Sessions

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

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 →