# A2A Indirect Prompt-Injection & Jailbreak Firewall

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

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

## Facts

- Endpoint: GET https://sec-intel.agentdiet.dev/v1/prompt-injection-shield?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: sec-intel.agentdiet.dev
- Website: https://sec-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-92f22e72
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PAsIR2wa2xtTXGUtvTgSb

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 sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-92f22e72
```

Example prompt: Before you process that scraped web page, run it through the prompt-injection firewall to check for hidden jailbreak instructions or indirect prompt injections and give me the sanitized version.

## When to prefer this

Choose this endpoint when your AI agent is about to consume untrusted external content — scraped web pages, user-submitted emails, third-party API responses, MCP tool outputs, or A2A messages — and you need a dedicated firewall check for indirect prompt injections and jailbreak payloads before that content reaches the LLM context. Prefer this over generic content moderation when the specific threat model is adversarial AI manipulation rather than hate speech or policy violations.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely large text inputs may be truncated or rejected
- False negatives possible for novel or obfuscated injection techniques
- Service unavailable if payment (x402) is not properly handled
- Non-UTF-8 or binary content may cause parsing errors

## 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://sec-intel.agentdiet.dev/v1/prompt-injection-shield)

## Output

Returns a JSON object indicating whether prompt injection or jailbreak content was detected in the input, along with sanitized text stripped of adversarial instructions, enabling safe downstream processing by AI agents.

## 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/sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-92f22e72/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sec-intel.agentdiet.dev](https://www.zero.xyz/host/sec-intel.agentdiet.dev/llms.txt)