# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from company-enrich.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 content.

## Facts

- Endpoint: GET https://company-enrich.agentdiet.dev/v1/prompt-shield?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: company-enrich.agentdiet.dev
- Website: https://company-enrich.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/company-enrich-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-88d5a355
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xwQgopM-2RVatNVcciktC

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 company-enrich-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-88d5a355
```

Example prompt: Before you summarize that webpage, scan its raw HTML through the prompt-injection firewall first — I want to make sure there are no hidden instructions trying to hijack you embedded in the page content.

## When to prefer this

Choose this endpoint when your agent is about to process content from untrusted external sources — scraped web pages, incoming emails, third-party API or MCP responses, or user-submitted text — and you need to detect and neutralize hidden prompt injections or jailbreak payloads before they reach your core LLM pipeline. Prefer it over generic content filters when the specific threat model is adversarial prompt manipulation targeting AI agents.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely long inputs may be truncated or rejected
- False negatives possible for novel or obfuscated injection techniques
- Service unavailable if payment (x402) fails or quota is exceeded
- Ambiguous or benign-looking injections may not be flagged with high confidence

## 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://company-enrich.agentdiet.dev/v1/prompt-shield)

## Output

Returns a JSON 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 safe for downstream agent processing.

## 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/company-enrich-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-88d5a355/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from company-enrich.agentdiet.dev](https://www.zero.xyz/host/company-enrich.agentdiet.dev/llms.txt)