# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from github-audit.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://github-audit.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: github-audit.agentdiet.dev
- Website: https://github-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/github-audit-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-8e6234a8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hwNod1etbXt4NGm0ezf41

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 github-audit-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-8e6234a8
```

Example prompt: Before you process this scraped webpage content, run it through the prompt-injection firewall to check for any hidden instructions or jailbreak payloads — here's the raw HTML: '<html>...buy now...</html>'

## When to prefer this

Choose this endpoint when your AI agent is about to process content from untrusted external sources — web scrapes, emails, third-party MCP/A2A tool responses — and you need to detect or strip hidden prompt injection or jailbreak payloads before they reach your LLM. Prefer this over generic content filters when the threat model is specifically indirect prompt injection in agentic pipelines.

## Known failure modes

- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long payloads may be truncated or time out
- Novel or obfuscated injection techniques may not be detected (false negatives)
- Non-text binary content may not be parseable
- HTTP 402 payment required if x402 micropayment not completed
- 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://github-audit.agentdiet.dev/v1/mcp-injection-firewall)

## Output

Returns a JSON object containing the sanitized version of the input text with any detected prompt injection or jailbreak payloads identified and stripped, along with detection signals or flags indicating what threats were 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/github-audit-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-8e6234a8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from github-audit.agentdiet.dev](https://www.zero.xyz/host/github-audit.agentdiet.dev/llms.txt)