# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from mesh.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://mesh.agentdiet.dev/v1/indirect-injection-guard?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mesh.agentdiet.dev
- Website: https://mesh.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mesh-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-firewall-b5458ecc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GnKNvK-LUTGCEZyQk_uH5

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 mesh-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-firewall-b5458ecc
```

Example prompt: Before you process that scraped webpage, can you run it through the prompt injection firewall to make sure there are no hidden instructions or jailbreak payloads embedded in it?

## When to prefer this

Choose this endpoint when your AI agent pipeline processes content from untrusted external sources — scraped web pages, inbound emails, third-party API responses, MCP tool outputs, or user-submitted text — and you need to guard against indirect prompt injection or jailbreak attacks before that content influences agent behavior. It is especially valuable in agentic workflows where LLM outputs feed directly into subsequent actions.

## Known failure modes

- Empty or missing 'text' parameter returns a 400 validation error
- Very large payloads may exceed input limits or increase latency
- Sophisticated obfuscated injections may evade detection (false negatives)
- Payment failure via x402 results in 402 response blocking the scan
- Non-text binary content may produce unreliable results

## 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://mesh.agentdiet.dev/v1/indirect-injection-guard)

## Output

Returns a structured object indicating whether prompt injection or jailbreak content was detected, along with sanitized version of the input text with malicious payloads removed 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/mesh-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-firewall-b5458ecc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mesh.agentdiet.dev](https://www.zero.xyz/host/mesh.agentdiet.dev/llms.txt)