# 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/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-2f72a7cf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q5IYP_Z6x1LOO6273p-2V

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-2f72a7cf
```

Example prompt: Before you process the content from that webpage, run it through the prompt injection firewall to check for any hidden jailbreak instructions or malicious prompt injections embedded in the HTML.

## When to prefer this

Choose this endpoint when your AI agent needs to safely consume untrusted external content — web pages, emails, MCP tool responses, or A2A payloads — before processing or acting on it. It is specifically designed for agent-to-agent and MCP pipeline security scenarios where indirect prompt injection is a risk, making it preferable over generic content filters that are not LLM-attack-aware.

## Known failure modes

- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long payloads may exceed query parameter limits when passed via GET
- Ambiguous or novel injection patterns may not be detected if not covered by current detection rules
- HTTP 402 payment required if x402 payment header is missing 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/guard)

## Output

Returns a JSON object indicating whether the input text contains prompt injection or jailbreak payloads, along with sanitized text with malicious instructions removed or flagged, allowing the agent to safely consume external content.

## 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-2f72a7cf/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)