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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.

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Claude Code v2.1.228 11 Aug 2026

Bundled SDK client reads a webhook signing key from the environment

Use it now

Useful2 Signal3

SDK Notable not in their notes

The bundled client now reads a webhook signing key from ANTHROPIC_WEBHOOK_SIGNING_KEY.

ANTHROPIC_WEBHOOK_SIGNING_KEYwebhookKey

What

The bundled Anthropic client constructor now takes a webhookKey option that defaults to the ANTHROPIC_WEBHOOK_SIGNING_KEY environment variable, or null when it is unset. Previously that variable appeared only in bundled documentation and no client code read it.

Details

Set ANTHROPIC_WEBHOOK_SIGNING_KEY to have it picked up automatically; passing webhookKey explicitly overrides it.

Evidence

ANTHROPIC_WEBHOOK_SIGNING_KEY

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

See this entry in the whole of v2.1.228 →