# 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-injection and jailbreak attacks and returns sanitized output.

## Facts

- Endpoint: GET https://llms-generator.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: 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-adc8e2ad
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VNyI_J2K1ImM-F_VTjZuz

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-adc8e2ad
```

Example prompt: Before you process this scraped webpage content, scan it for any hidden prompt injections or jailbreak attempts and give me the sanitized version: [paste untrusted HTML or text here].

## When to prefer this

Choose this endpoint when your AI agent is about to consume untrusted external content — scraped web pages, emails, MCP/A2A tool responses, or user-supplied text — and you need to screen it for hidden prompt injections or jailbreak attempts before passing it to your LLM. Prefer it over generic content moderation endpoints when the specific threat model is adversarial instructions embedded in otherwise benign-looking content targeting AI agents.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely long payloads may hit size limits or timeout
- Ambiguous borderline content may not be flagged (false negatives)
- Payment failure (HTTP 402) if x402 payment is not provided or insufficient
- Service unavailability returns 5xx 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://llms-generator.agentdiet.dev/v1/prompt-injection-shield)

## Output

Returns an object containing the sanitized version of the submitted text with any detected prompt-injection or jailbreak payloads removed or flagged, allowing the calling agent to safely consume external content without risk of adversarial instruction hijacking.

## 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-adc8e2ad/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)