# 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 attacks, returning sanitized output

## Facts

- Endpoint: GET https://sec-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: 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-63e04ebf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3qPd1bQTIYOkIxfMZ4uTh

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-63e04ebf
```

Example prompt: Before you process this scraped web page, run it through the prompt injection firewall to check for any hidden jailbreak instructions or malicious prompt injections — here's the raw content: [paste content].

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — web scraping, email processing, third-party API responses, or MCP tool outputs — and you need to sanitize that content before passing it to an LLM. It is specifically designed for the indirect prompt injection threat model where adversarial instructions are hidden inside seemingly benign content retrieved from the web or external tools. Prefer this over generic content filters when you need LLM-specific jailbreak and prompt injection detection rather than general malware or spam filtering.

## Known failure modes

- Missing required 'text' parameter returns validation error
- Empty string input rejected due to minLength:1 constraint
- Very long payloads may time out or be truncated
- Novel or obfuscated injection techniques may evade detection
- Non-text binary content may produce unreliable results
- Payment required (HTTP 402) if x402 micropayment header not provided

## 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/guard)

## Output

Returns a sanitized version of the submitted text with hidden prompt injection and jailbreak payloads removed or flagged, along with detection metadata indicating whether malicious 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/sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-63e04ebf/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)