# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from domain-osint.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://domain-osint.agentdiet.dev/v1/tool-poisoning-shield?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: domain-osint.agentdiet.dev
- Website: https://domain-osint.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/domain-osint-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-5fd6cd1d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jlUY0c3QfoXVKoFqwqUcV

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 domain-osint-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-5fd6cd1d
```

Example prompt: Before you process that scraped web page, run it through the prompt-injection firewall to check for any hidden jailbreak instructions or malicious prompt injections embedded in the HTML.

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests untrusted external content — scraped web pages, user emails, third-party tool responses, or A2A payloads — and you need a dedicated firewall step to detect and strip hidden prompt injections or jailbreak attempts before that content reaches your LLM. It is especially valuable in autonomous agent workflows where tool poisoning or indirect prompt injection is a real attack surface.

## Known failure modes

- Missing required 'text' parameter returns a 400 error
- Empty string input rejected due to minLength:1 constraint
- Very large payloads may time out or be truncated
- Sophisticated obfuscated injections may evade detection
- Payment failure via x402 returns 402 Payment Required
- Service downtime 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://domain-osint.agentdiet.dev/v1/tool-poisoning-shield)

## Output

Returns a structured object containing the scan result for the submitted text, including whether prompt injection or jailbreak payloads were detected and a sanitized version of the input text 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/domain-osint-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-5fd6cd1d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-osint.agentdiet.dev](https://www.zero.xyz/host/domain-osint.agentdiet.dev/llms.txt)