# 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/jailbreak-scan?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-9e4acaf1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_en-SEYQmPR0BgwiWCCYEt

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-9e4acaf1
```

Example prompt: Before you process that webpage I just scraped, scan the raw HTML for any hidden prompt injection or jailbreak payloads — I don't want any malicious instructions sneaking through to you.

## When to prefer this

Choose this endpoint when your AI agent is about to consume untrusted external content — web pages, emails, API responses, or MCP/A2A tool outputs — and you need a dedicated security layer to detect and strip prompt injection or jailbreak payloads before they reach your LLM. Prefer it over generic content filters when your threat model specifically involves adversarial prompt injection in agentic pipelines, especially in A2A or MCP architectures.

## Known failure modes

- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long inputs may be truncated or rejected
- False negatives are possible for novel or obfuscated injection techniques
- Service unavailability or payment failure (402) if x402 micropayment is not properly handled
- Non-text binary content may not be scanned accurately

## 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/jailbreak-scan)

## Output

Returns a structured object indicating whether the input text contains prompt injection or jailbreak payloads, along with sanitized text safe for downstream LLM consumption. The response includes a detection verdict and cleaned content stripped of malicious injection attempts.

## 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-9e4acaf1/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)