# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from llms-generator.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 injections and jailbreak attempts, returning sanitized output.

## Facts

- Endpoint: GET https://llms-generator.agentdiet.dev/v1/system-prompt-guard?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: llms-generator.agentdiet.dev
- Website: https://llms-generator.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/llms-generator-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-ad236b1e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_abXiBlbuGCRwD6xH6MCq1

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 llms-generator-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-ad236b1e
```

Example prompt: Before processing this scraped web page content, run it through the prompt-injection firewall to detect and strip any hidden jailbreak instructions: '[raw HTML or text content here]'.

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — scraped web pages, user-submitted emails, third-party MCP/A2A tool responses — and you need a lightweight, per-call firewall that detects and sanitizes prompt injections and jailbreak attempts before they reach your LLM. Prefer it over building custom regex filters when you need a dedicated, maintained detection layer compatible with x402 micropayment and MCP/A2A protocols.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely large payloads may time out or be truncated
- Obfuscated or novel injection techniques may evade detection
- Non-text binary content may not be properly parsed
- HTTP 402 payment required if x402 micropayment 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://llms-generator.agentdiet.dev/v1/system-prompt-guard)

## Output

Returns a JSON object containing the sanitized version of the input text with prompt injection and jailbreak payloads removed or flagged, along with detection signals 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/llms-generator-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-ad236b1e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from llms-generator.agentdiet.dev](https://www.zero.xyz/host/llms-generator.agentdiet.dev/llms.txt)