For tax advisers, lawyers and accounting offices

Claude, without your clients' personal data

bareminimum sits between Claude Desktop or Claude Code and Anthropic. Names, addresses, PESEL, NIP, IBAN and other Polish identifiers are replaced with consistent stand-ins before a request leaves, and put back in every reply. You work as usual; Anthropic reads about other people.

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What each side sees

You type	Anthropic receives	You read
Umowa najmu z Eryką Delmaczyńską	Umowa najmu z Edytką Babalską	Umowa najmu z Eryką Delmaczyńską
PESEL 87110311611	PESEL 62091791652	PESEL 87110311611
PL71 9077 2572 7716 2877 9012 8297	PL82 9077 2572 2160 3689 7392 8697	PL71 9077 2572 7716 2877 9012 8297

An illustration: stand-ins are drawn per person, decline like the original and pass the same checksums. See it on your own data.

Built for client confidentiality

If your clients' confidentiality is a professional duty, every prompt naming them is a disclosure to decide on. bareminimum pseudonymizes what you send (GDPR art. 4(5)): a technical safeguard you can document, not a certificate of compliance. What it means for your profession.

1. Detect

   A name-detection model runs inside the gateway, beside a checksum-validated grammar for every identifier; no third-party service sees your text to find personal data.

2. Replace

   Each piece becomes a stand-in of the same kind, the same for you in every conversation, so Claude reasons as before and prompt caching keeps working.

3. Restore

   Replies come back with the originals in place, as they stream.

How it works · Connect Claude · What Anthropic still sees