# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from preflight.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://preflight.agentdiet.dev/v1/rag-poison-shield?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-41824608
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4ZxslPLll-afEe8T2J7Zg

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 preflight-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-41824608
```

Example prompt: Before you summarize that webpage I just scraped, can you run it through the RAG poison shield to check for any hidden prompt injections or jailbreak instructions embedded in the HTML?

## When to prefer this

Choose this endpoint when your AI agent or RAG pipeline consumes untrusted external content — web pages, emails, tool responses, or A2A payloads — and you need a dedicated firewall layer to strip hidden prompt injections before they reach your LLM. Prefer this over general-purpose content filters when the specific threat model is adversarial LLM manipulation (indirect prompt injection, jailbreaks) rather than generic spam or malware.

## Known failure modes

- Empty or missing 'text' parameter returns validation error
- Extremely long payloads may be truncated or rejected
- Sophisticated obfuscated injections may evade detection
- Payment failure (402) if x402 USDC micropayment is not provided
- False positives on legitimate content that resembles injection patterns

## 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://preflight.agentdiet.dev/v1/rag-poison-shield)

## Output

Returns a structured object indicating whether prompt injection or jailbreak content was detected, along with sanitized text with malicious instructions removed or flagged, allowing safe downstream consumption by AI agents or LLMs.

## 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/preflight-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-41824608/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)