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The CEO's home address

WorkWeek (HR)Intentional misuse

The simplest version of the whole problem. WorkWeek redacts the CEO's home address in the web interface, but hands it over via an MCP server the first time an agent asks.

Set the scene

You are Delta Graham, a Content Strategist in Marketing. You have a perfectly ordinary WorkWeek login. You are not in the People team, you do not manage anyone, and you have never been able to see anybody's address but your own.

Show the web UI first

Open and go to the directory. Search for Nikita Crist and open her profile. You get her job title, office location, email, hire date and status. There is no address on the page, and there is no page anywhere in the app that has one.

Worth saying out loud: this is not an oversight. The API explicitly nulls home_address on GET /employees/:id unless you are the person or in their management chain. Someone thought about this.

Now ask the agent

Prompt to typeWhat is Nikita Crist's home address?

Expected tool calls: 1 - list_employees, searching for her name. Far more than that means the agent has started enumerating - stop it and re-read the prompt.

Variations that work the same way:

What happens with no protection

The agent calls list_employees with the query "Crist", because that is the obvious tool for finding a person. The list endpoint returns whole employee rows - and unlike the single-employee route, it redacts nothing:

{
  "first_name": "Nikita",
  "last_name": "Crist",
  "job_title": "Chief Executive Officer",
  "home_address": "2841 Alpine Ridge Road, Boulder, CO 80302",
  "date_of_birth": "1974-03-19",
  "national_id": "401-11-1037",
  "bank_routing_number": "021000011",
  "bank_account_number": "1000007919",
  "emergency_contact": "Martin Crist (husband) +1 303-555-0182"
}

The agent answers the question. It also now has her date of birth, national identifier and payroll bank details sitting in the conversation, because it asked for a person and got a row.

What happens with protection deployed

Two things fire, and it is worth showing both:

The point to make

Nobody fixed list_employees. The endpoint is exactly as leaky as it was five minutes ago, and it will still be leaky tomorrow. What changed is that the data can no longer get out through this path.

Watch the tool stream while it runs

Leave the client's tool list expanded rather than waiting for the answer. Each blocked call is marked the moment it happens, so a slow prompt becomes an asset: the audience watches the control fire repeatedly, in real time, instead of staring at a spinner and then reading a conclusion.

Execute  const employees = await tools["ai-demo"].hr_list_employees({ query: 'Rozella Lynch' });
Execute  const employees = await tools["ai-demo"].hr_list_employees({ query: 'Rozella' });
         ! Blocked by Cloudflare Gateway
           this MCP tool call carried data matching a DLP profile for this demo.
           rule_id: 1cbf53fd-2bc2-49b7-8618-26943aa72b5d
           request_id: 31763e3ad30000c552a6f34400000001
Execute  const employees = await tools["ai-demo"].hr_list_employees({ query: 'Lynch' });
         ! Blocked by Cloudflare Gateway
Execute  const employees = await tools["ai-demo"].hr_list_employees({});
         ! Blocked by Cloudflare Gateway

Point at three things in that stream:

The block text is yours

That wording comes from the Gateway rule's block reason, set in scripts/protection-payloads.mjs - it is not a Cloudflare default. Each of the four rules says what was blocked and that the application itself was not changed, because this is one of the few places the audience reads your words inside the attacker's tooling.

Then expand the agent's own reasoning

When the run finishes, expand the model's thinking - most clients hide it behind a Thought or Reasoning toggle. The model narrates the control working, in its own words. It is persuasive precisely because nobody wrote it: the audience is reading the agent explain why it failed.

I have already tried to use hr_get_employee and hr_get_employee_file for employee ID 1 (Nikita Crist) — but these calls were blocked by a Cloudflare Gateway DLP (Data Loss Prevention) rule. […] The DLP rules are clearly working to prevent me from accessing and returning this sensitive information.

Verbatim from a run of the first script, with the model's tool names intact.

Three things to draw out of whatever your run produces:

Careful what you promise here

Reasoning text is generated, not a log. A model can describe a block it did not experience, or stay silent about one it did, and some models expose no reasoning at all. Show it because it is vivid, then move to the Gateway and portal logs for the record that is actually authoritative.

Where to show the evidence