# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from cve-intel.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, returning sanitized content.

## Facts

- Endpoint: GET https://cve-intel.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: cve-intel.agentdiet.dev
- Website: https://cve-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/cve-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-bbb21450
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_63boJKhVkfIQMg_Jwo9o_

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 cve-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-bbb21450
```

Example prompt: Before you process this web page I just scraped, run it through the prompt injection firewall to make sure there are no hidden instructions or jailbreak payloads embedded in the text.

## When to prefer this

Choose this endpoint when your AI agent or pipeline ingests untrusted external content — web pages, emails, MCP tool responses, or A2A payloads — and you need to screen for hidden adversarial prompt injections before processing. It is especially valuable in agentic workflows where external data flows directly into an LLM context, making indirect injection a live risk.

## Known failure modes

- Empty or missing 'text' parameter returns a 400 validation error
- Very large payloads may be rejected or truncated
- Payment not completed (HTTP 402) blocks the request if x402 payment is not provided
- False negatives: sophisticated or novel injection techniques may not be detected
- Non-UTF-8 or malformed HTML may cause parsing 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://cve-intel.agentdiet.dev/v1/guard)

## Output

Returns a JSON object indicating whether prompt injection or jailbreak content was detected in the submitted text, along with a sanitized version of the input safe for downstream agent consumption.

## 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/cve-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-bbb21450/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cve-intel.agentdiet.dev](https://www.zero.xyz/host/cve-intel.agentdiet.dev/llms.txt)