How to Check an AI Tool's Subprocessors Before You Trust It With Work Text

When you paste text into an AI writing tool, you are trusting more than one company. The app you use may send it to a model provider, which may run on a cloud platform, with logging, monitoring and support tools from yet more vendors. Each of those is a subprocessor, and each one is somewhere your text can be stored, accessed, or exposed.

Checking the subprocessor list takes ten minutes and tells you more about a tool’s real privacy than its marketing page.

Why Subprocessors Matter

Under the GDPR, a processor may only engage another processor with the controller’s authorisation, and must pass on the same data protection obligations, as set out in Article 28. That is why reputable vendors publish subprocessor lists and notify customers of changes.

For you, the list answers practical questions:

• Which model provider actually sees my text?
• In which countries is it processed?
• How many companies are in the chain?
• Did the list change recently?

Where To Find The List

Look for:

• A “Subprocessors” or “Sub-processors” page, often linked from the privacy policy, trust centre or Data Processing Agreement (DPA).
• The DPA itself, which usually references the list.
• A trust or security portal, common with larger vendors.

If you cannot find one, ask. A vendor that cannot tell you who processes your data is telling you something important. See questions to ask an AI vendor about data.

What To Look For

The model provider. Most AI writing apps do not run their own models; they call OpenAI, Anthropic, Google, Mistral or others. Check the provider’s own retention terms too.

Hosting and locations. Cloud platforms and regions. If you need EU-only processing, check every entry, not just the headline.

Purpose of each entry. “Customer support”, “analytics”, “error monitoring”. Error monitoring tools sometimes capture request content if misconfigured.

Change notification. Good vendors let you subscribe to updates and object to new subprocessors.

Number of entries. Not a problem in itself, but each one is an extra party to trust.

Red Flags

• No list at all, or a list that says “and other service providers”.
• Analytics or advertising companies with access to content.
• Vague purposes such as “service improvement”.
• Model providers listed without their retention terms, or with terms that allow training on your data.
• Recent additions without notice, especially after an acquisition. See what happens to your data when an AI startup is acquired.

A Shorter Chain Is Safer

Every link in the chain is a policy, a contract and a set of employees you have to trust. The shortest possible chain is none: a model that runs on your own computer has no subprocessors for the rewrite itself, because nothing is sent. That is why many teams use a cloud tool for generic drafting and a local one for anything confidential.

Writing To A Vendor

If the information is missing, ask directly.

Before:

hey, who do you send our data to? need to know for compliance asap

After:

We are reviewing your service for use with business documents. Could you send your current list of subprocessors, including the AI model provider, the purpose and processing location for each, and how you notify customers of changes? A copy of your Data Processing Agreement would also help. We aim to complete the review by 24 October.

The second version is specific, explains why, and sets a date, which gets a faster and more complete answer.

A Wrivio Context for vendor questions could say:

Rewrite this as a professional request to a software vendor. Polite, precise and brief, list each item requested. Keep every deadline, requirement and name exactly as written. Do not add requests or legal claims that are not in the original.

Press Ctrl+Shift+Space, paste the draft, and check the list of requests is complete.

Common Questions

What is the difference between a processor and a subprocessor?

A processor handles personal data on your behalf, such as the AI app. A subprocessor is another company the processor uses to do that, such as its model provider or cloud host.

Do consumer AI apps have subprocessor lists?

Many consumer services do not publish them in the same way business services do. That is one reason consumer accounts are a poor fit for work data.

Can I object to a new subprocessor?

Many DPAs give business customers a right to object within a notice period, sometimes with the option to terminate. Check your agreement.

Does a local AI tool have subprocessors?

The rewrite itself does not involve any, because nothing is transmitted. The app may still use services for things like downloads, account sign-in or optional telemetry, so check those separately.

Download Wrivio for Windows to rewrite confidential text locally, with no subprocessor chain for your words to travel through.