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Sweep 01 Oct 2026 · 17:27Z Build v2.1.287 508 read Stable v2.1.285 Latest v2.1.287 Next v2.1.287 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.286 ·

Missing-attachment placeholder replaced by a server-controlled switch

Code that put a placeholder in place of an attachment that could not be downloaded now reads a server-controlled switch instead

Under the hood Internal Changes
JSON All of v2.1.286
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
AttachmentsArea: what it touches
Internal ChangesKind: in v2.1.286,
Internal ChangesSection of the release
What

When an attachment arrived empty, Claude Code used to put in the text "[attachment could not be downloaded]" in its place. That code now reads a server-controlled switch, tengu_violin_neck. It is off unless it is switched on remotely. What the switch controls cannot be seen from this change.

In readings taken before this release, the flag server returned tengu_violin_neck as on both for this site's account and for a baseline check made without an account.

Why

The old placeholder is gone from this part of the code, so it may now be handled somewhere else.

Read from
Feature flag
tengu_violin_neck Off by default, switched on for this account

The shipped code defaults this off, and the flag server returned on for the one account this site reads on this version. That is the reading that makes the entry above worth a second look, and it still says nothing about your account.

This account: on · anonymous baseline: on · compiled default in v2.1.286: off

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.286. It isn't a statement about your account. What a flag value here can and cannot tell you

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 the switch does, and whether the placeholder text is still used anywhere, is not known.
The name it cites is new in this buildNew in this build: tengu_violin_neck

See this entry in the whole of v2.1.286 →

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