Block prompt injection before AI agents with GPT-5.5, Slack, and Google Sheets

This template is for AI builders, SecOps teams, and automation teams that expose agents, chatbots, or webhook workflows to untrusted user input. It helps reduce the risk of prompt injection, system prompt extraction, social engineering, and malicious content reaching downstream AI workflows.

How it works

The workflow receives text through a webhook and runs a zero-trust screening process before the input reaches a business agent. A Code node checks for deterministic attack patterns such as instruction overrides, role hijacking, prompt leakage attempts, hidden Unicode, SQL-style payloads, and XSS-style content. A second layer extracts URLs and applies local suspicious-domain heuristics. An isolated GPT-5.5 evaluator then classifies semantic risk, including prompt injection, data exfiltration intent, and social engineering. A scoring node combines the signals and routes low-risk input to a safe response while suspicious input is blocked, logged, and sent to Slack.

How to set up

Connect OpenAI, Slack, and Google Sheets credentials. Send untrusted input to the /firewall-check webhook before your main AI agent workflow.

Requirements

OpenAI access to GPT-5.5, Slack credentials, Google Sheets, and a webhook caller.

How to customize the workflow