🛡️ How I Built Trifecta Checker to Stop Lethal AI Agents with One API Call

Description and use

A single API call can block an AI agent that has private data access, untrusted content, and external communication, preventing data theft.

Problem

An AI agent can become a data‑theft tool if it has private data access, untrusted content, and external communication, enabling prompt injection.

Outcome

A single API call can preemptively stop an AI agent that would otherwise have the lethal trifecta, reducing the risk of data theft.

Workflow

• 1. Deploy Trifecta Checker API. 2. Call the API with a JSON payload listing the agent’s tools. 3. API evaluates the tool list against the lethal trifecta criteria. 4. If all three conditions are met, the API returns a block response and the agent is prevented from executing.

Evidence

If an agent has all three, prompt injection = data theft.

Source

One API call blocks execution BEFORE it runs.

Source