# 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 injection and jailbreak attacks, returning sanitized output.

## Facts

- Endpoint: GET https://workflows.agentdiet.dev/v1/llm-jailbreak-defense?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-bdb82852
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SCVonH_TsFaQ35WKUuoBM

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-bdb82852
```

Example prompt: Before you process this scraped webpage content, run it through the prompt injection firewall first to check for hidden jailbreak instructions and give me the sanitized version: [paste untrusted text here].

## When to prefer this

Choose this endpoint when your agent pipeline ingests content from untrusted external sources — scraped web pages, user emails, third-party MCP/A2A tool responses — and needs a dedicated firewall layer before that content reaches an LLM. Prefer it over generic content filters when you specifically need prompt injection and jailbreak detection rather than general moderation, and when your stack already supports x402 micropayments for per-call billing.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely large payloads may time out or exceed size limits
- Novel or obfuscated injection techniques may evade detection
- Non-text binary content may not be parseable
- Payment failure (HTTP 402) if x402 micropayment is not properly handled

## 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/llm-jailbreak-defense)

## Output

Returns a JSON object containing the scan result for the submitted text, including detection of hidden prompt injection or jailbreak payloads and a sanitized version of the input safe for downstream LLM 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/workflows-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-bdb82852/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)