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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 2026-10-23).
Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injection and jailbreak attempts, returning sanitized output.
Price / call$0.005
Success—
StatusUnknown
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/prompt-firewall)
Output
Returns a JSON object containing the firewall's verdict on the input text, including whether prompt injection or jailbreak content was detected and a sanitized version of the text safe for downstream LLM consumption.
Example use cases
Safe web browsing for AI agent
“I need you to fetch that news article URL and scan its raw content for any hidden prompt injection attacks before you process it — pass the full HTML through the prompt firewall first.”
Email phishing payload screening
“Before my agent reads and acts on this inbound email, scan the full email body for any embedded jailbreak instructions or indirect prompt injections that could hijack its behavior.”
MCP tool response sanitization
“The MCP server just returned a tool response — before you use that output to make any decisions, run it through the prompt injection firewall and give me the sanitized version.”
Technical details
Endpoint
POSThttps://mesh.agentdiet.dev/v1/prompt-firewall?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests untrusted third-party content — scraped web pages, user-submitted text, emails, external API responses, or MCP/A2A tool outputs — and you need a dedicated security layer to detect and neutralize hidden prompt injections or jailbreak payloads before they reach your LLM. Prefer it over general-purpose content filters when your threat model specifically involves adversarial prompt manipulation targeting autonomous agents.
Side effects
- Empty or missing 'text' field returns a 400 validation error
- Extremely long payloads may be truncated or rejected
- Payment required (HTTP 402) if x402 micropayment header is not included
- False negatives possible for highly novel or obfuscated injection techniques
- Non-UTF-8 encoded content may fail to parse correctly
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| textrequired | string | Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads |
Output
Schema · Response
{
"type": "object"
}Reviews
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