# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from json-repair.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 content.

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/mcp-injection-firewall?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: json-repair.agentdiet.dev
- Website: https://json-repair.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/json-repair-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-4108aabf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wxf-aklX5qhbAwa1sxzG3

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 json-repair-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-4108aabf
```

Example prompt: Before you process this webpage content, scan it for any hidden prompt injection or jailbreak instructions embedded in the HTML — here's the raw text: [paste content here].

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests untrusted external content — web pages, emails, MCP tool outputs, or A2A messages — before feeding that content to an LLM or downstream agent. It is specifically designed for indirect prompt injection and jailbreak scenarios in agentic workflows, making it the right choice when you need a dedicated security layer rather than relying on the LLM's own defenses.

## Known failure modes

- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long inputs may be truncated or rejected
- Payment failure (402) if x402 micropayment is not properly attached
- Obfuscated injections using encoding tricks may evade detection
- Non-English injections may have lower detection accuracy

## 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://json-repair.agentdiet.dev/v1/mcp-injection-firewall)

## Output

Returns a structured object containing the sanitized version of the input text with detected prompt injection or jailbreak payloads identified and neutralized, along with detection signals indicating whether malicious content was found.

## 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/json-repair-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-4108aabf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from json-repair.agentdiet.dev](https://www.zero.xyz/host/json-repair.agentdiet.dev/llms.txt)