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Sweep 02 Oct 2026 · 18:55Z Build v2.1.288 509 read Stable v2.1.285 Latest v2.1.288 Next v2.1.288 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.288 ·

Agent proxy certificate setup reworked and no longer checks a server setting there

Setting up trust for the agent proxy's certificate no longer checks a server switch there and now catches certificates listed in swapped order

Under the hood Internal Changes
JSON All of v2.1.288
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
SessionsArea: what it touches
Internal ChangesKind: in v2.1.288,
Internal ChangesSection of the release
What

The agent proxy is a go-between that some network traffic passes through. To work, it needs a certificate, a digital credential, that your computer trusts. The step that adds this certificate to your computer's trusted list was reworked:

  • It no longer checks the server-side setting tengu_violin_purfling at this point.
  • It now reports a result.
  • It compares certificates by their exact contents, so it can tell when two certificates are in swapped order.

The same setting is still used elsewhere in Claude Code.

Why

The trust step may now run without depending on that setting.

Read from
Feature flag
tengu_violin_purfling On for this account, and not off by default

The flag server returned on for the one account this site reads, and nothing in this release compiles it off by default. The compiled default is shown below, and says which it is when we cannot read one: a fifth of gates compile in a string or a number rather than on or off, and most published releases have no gate table behind them at all. No client can see what the server returns for your account.

This account: on · anonymous baseline: on · compiled default in v2.1.288: not a boolean we can read

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 v2.1.288. 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 doubtIt is not clear what the remaining use of the setting controls, or whether the trust step still depends on it in some other way.

See this entry in the whole of v2.1.288 →

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