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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
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Claude Code v2.1.299 ·

Tail diagnostics can run without the diagnostics variable set

The tail diagnostics snapshot can now run when another part of Claude Code asks for it, even without CLAUDE_CODE_DIAGNOSTICS_FILE

Under the hood No documentation found Internal Changes
JSON All of v2.1.299
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
Internal ChangesKind: in v2.1.299,
Internal ChangesSection of the release

Unclear No part of Claude Code is known to request the snapshot this way yet, so whether it runs without the variable is not known.

What

Claude Code's tail diagnostics snapshot used to run only when CLAUDE_CODE_DIAGNOSTICS_FILE was set. It can now also run when the part of Claude Code that calls it asks for it, even if that environment variable is not set.

Why

Diagnostics may be collected without the variable being set.

Read from
Names in the bundleCLAUDE_CODE_DIAGNOSTICS_FILE
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 doubtNo part of Claude Code is known to request the snapshot this way yet, so whether it runs without the variable is not known.

See this entry in the whole of v2.1.299 →

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