# 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 attempts, returning sanitized output.

## Facts

- Endpoint: GET https://cve-intel.agentdiet.dev/v1/injection-firewall?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-cf8f422b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_C_TVCrJqzEYxU9Mx-JIJ3

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-cf8f422b
```

Example prompt: Before you process that scraped web page, run it through the prompt-injection firewall first — paste the full HTML text and check whether it contains any hidden jailbreak or indirect prompt-injection payloads.

## When to prefer this

Choose this endpoint when your AI agent is about to consume untrusted third-party content — scraped web pages, emails, MCP tool responses, or A2A payloads — and you need a dedicated firewall pass before the content reaches the LLM context. Prefer this over generic content moderation APIs when the threat model is specifically prompt injection and jailbreak attacks targeting AI agents rather than harmful user-generated content.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely long text inputs may be truncated or rejected
- False negatives possible for novel or obfuscated injection techniques
- Payment failure via x402 results in HTTP 402 response blocking the call
- Network timeout if the scanning service is under load

## 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/injection-firewall)

## Output

Returns a structured object indicating whether the input text contains prompt injection or jailbreak payloads, along with sanitized version of the text safe for 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-cf8f422b/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)