# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from mesh.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-21).

Scans untrusted text, HTML, MCP responses, or A2A payloads for hidden prompt injection and jailbreak attacks, returning sanitized content.

## Facts

- Endpoint: GET https://mesh.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: mesh.agentdiet.dev
- Website: https://mesh.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mesh-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-firewall-3c0f001e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kAk8p-UlVLMGfIue6t3Qf

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 mesh-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-firewall-3c0f001e
```

Example prompt: Before you process that scraped web page I just fetched, run it through the prompt injection firewall first — check the full HTML text for any hidden instructions or jailbreak payloads trying to hijack you.

## When to prefer this

Choose this endpoint when your AI agent is about to process content from untrusted external sources — web pages, emails, third-party API responses, MCP tool outputs, or A2A agent payloads — and you need to verify it does not contain hidden prompt injections or jailbreak instructions before acting on it. Especially valuable in multi-agent pipelines where one compromised node could poison downstream agents.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely long input may be truncated or rejected
- Sophisticated obfuscated injections may evade detection
- Non-text binary content may not be properly parsed
- Rate limiting or payment failure (402) if x402 micropayment is not resolved

## 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://mesh.agentdiet.dev/v1/injection-firewall)

## Output

Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input text, along with a sanitized version of the text with any malicious instructions removed or flagged.

## 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/mesh-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-firewall-3c0f001e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mesh.agentdiet.dev](https://www.zero.xyz/host/mesh.agentdiet.dev/llms.txt)