# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from shopify-intel.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-21).

Scans untrusted text, HTML, web pages, emails, MCP responses, or A2A payloads for hidden prompt injections and jailbreak attempts, returning sanitized text.

## Facts

- Endpoint: GET https://shopify-intel.agentdiet.dev/v1/guard?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: shopify-intel.agentdiet.dev
- Website: https://shopify-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/shopify-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-2f446dd7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_if_4EC03184ZkyfGhAVjP

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability shopify-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-2f446dd7
```

Example prompt: Before you process this email body I just fetched, run it through the prompt-injection firewall to make sure there are no hidden instructions or jailbreak payloads embedded in the text.

## When to prefer this

Use this endpoint whenever an AI agent is about to consume untrusted external content — scraped web pages, emails, MCP tool responses, A2A messages, or user-supplied text — and needs a security checkpoint to detect and strip hidden prompt injections or jailbreak instructions before they can influence the agent's behavior. Prefer this over generic content filters when your threat model specifically involves adversarial LLM manipulation rather than traditional spam or malware.

## Known failure modes

- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long text payloads may exceed input limits or time out
- Novel or obfuscated injection techniques may evade detection
- Non-UTF-8 encoded content may cause parsing issues
- Payment failure via x402 results in a 402 response blocking the scan

## How this service works

Scans untrusted web pages, emails, MCP responses, or A2A payloads for hidden prompt injections and returns sanitized text. (Live x402 v2, IETF MPP & MCP endpoint at https://shopify-intel.agentdiet.dev/v1/guard)

## Output

Returns a JSON object containing the sanitized version of the input text with any detected prompt injection or jailbreak content removed or flagged, along with detection signals indicating whether adversarial content was found.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "text": {
   "type": "string",
   "minLength": 1,
   "description": "Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/shopify-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-2f446dd7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shopify-intel.agentdiet.dev](https://www.zero.xyz/host/shopify-intel.agentdiet.dev/llms.txt)