# 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/mcp-injection-firewall?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-7b5c6ee2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HW1AOfmtkoigqsKLDgXCe

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-7b5c6ee2
```

Example prompt: Before you summarize that scraped webpage content, run it through the prompt injection firewall first to make sure there are no hidden instructions trying to hijack you — here's the raw HTML: '<div>...</div>'

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — web pages, emails, user submissions, third-party MCP tool responses, or A2A payloads — and you need a dedicated firewall layer to detect and neutralize indirect prompt injection or jailbreak attempts before that content reaches your LLM context. Prefer this over general content moderation tools when the threat model is specifically adversarial LLM manipulation rather than harmful content classification.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Very long inputs may be truncated or rejected
- Sophisticated obfuscated injections may evade detection
- Non-text binary content may not be parsed correctly
- Payment required (HTTP 402) if x402 micropayment not provided

## 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/mcp-injection-firewall)

## Output

Returns a sanitized version of the input text with prompt injection and jailbreak payloads removed or flagged, along with detection signals indicating whether malicious content was found in the original input

## 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-7b5c6ee2/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)