# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from alpha-stream.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://alpha-stream.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: alpha-stream.agentdiet.dev
- Website: https://alpha-stream.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/alpha-stream-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-0193e798
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CLzJGBqAqN6drLV-Ox7RA

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 alpha-stream-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-0193e798
```

Example prompt: Before you process this scraped web page content, run it through the prompt-injection firewall to make sure there are no hidden jailbreak instructions embedded in it: '<paste untrusted HTML or text here>'.

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — scraped web pages, third-party API responses, MCP tool outputs, A2A payloads, or user-submitted emails — and you need a dedicated security layer to detect and neutralize indirect prompt injections or jailbreak attempts before that content reaches your LLM. Prefer this over manual regex filtering or generic content moderation when the threat model specifically involves adversarial AI prompt manipulation rather than general toxicity or spam.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely large text inputs may be truncated or rejected
- Sophisticated obfuscated injections may evade detection (false negatives)
- Payment failure via x402 returns HTTP 402 before scan is performed
- Ambiguous or benign-looking injections may produce false positives
- Network timeout if the service is unavailable

## 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://alpha-stream.agentdiet.dev/v1/tool-poisoning-shield)

## Output

Returns a JSON object containing the scan result for the submitted text, indicating whether prompt injection or jailbreak payloads were detected and providing sanitized text with malicious instructions neutralized or flagged.

## 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/alpha-stream-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-0193e798/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from alpha-stream.agentdiet.dev](https://www.zero.xyz/host/alpha-stream.agentdiet.dev/llms.txt)