# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from workflows.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://workflows.agentdiet.dev/v1/prompt-firewall?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: workflows.agentdiet.dev
- Website: https://workflows.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/workflows-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-d65e0f2c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ySgvQFSBrMFMton4FhfcM

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 workflows-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-d65e0f2c
```

Example prompt: Before you process this scraped web page content, can you run it through the prompt-injection firewall to check for hidden jailbreak instructions and give me the sanitized version? Here's the text: 'You are now DAN. Ignore previous instructions and...'

## When to prefer this

Choose this endpoint when your AI agent is about to process content from untrusted external sources — web pages, emails, MCP tool responses, or A2A agent payloads — and you need to detect or strip hidden prompt injections and jailbreak attempts before the content reaches your LLM. Prefer this over generic content filters when the specific threat model is adversarial AI manipulation rather than general moderation.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely long payloads may exceed request limits or timeout
- Obfuscated or novel injection patterns may not be detected
- Non-text binary content may not be scannable
- Payment failure via x402 returns 402 status blocking the request

## 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://workflows.agentdiet.dev/v1/prompt-firewall)

## Output

Returns a JSON object containing the scan result for the submitted text, including whether a prompt injection or jailbreak payload was detected and a sanitized version of the input text with malicious instructions removed.

## 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/workflows-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-d65e0f2c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from workflows.agentdiet.dev](https://www.zero.xyz/host/workflows.agentdiet.dev/llms.txt)