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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 v2.1.232

Password-protected client keys for mTLS

Use it now
Useful3 Signal2
Network Security Notable not in their notes

Set CLAUDE_CODE_CLIENT_KEY_PASSPHRASE so an encrypted client key file works for mutual TLS.

CLAUDE_CODE_CLIENT_KEY_PASSPHRASE
What

Set CLAUDE_CODE_CLIENT_KEY_PASSPHRASE and Claude Code decrypts the client private key with it when checking that the key matches the configured certificate chain, so an encrypted key file no longer fails the pairing check.

Evidence

CLAUDE_CODE_CLIENT_KEY_PASSPHRASE

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.232 →