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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from mcp-security.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 injection and jailbreak attacks, 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://mcp-security.agentdiet.dev/v1/indirect-injection-guard)
Output
Returns a structured object containing the scan result: whether a prompt injection or jailbreak payload was detected, and a sanitized version of the input text with any malicious instructions removed or flagged.
Example use cases
Securing scraped web content for agents
“I'm about to feed this scraped article into my research agent — can you first scan it for any hidden prompt injections or adversarial instructions that might hijack the agent?”
Screening incoming emails for jailbreak attacks
“Before my email-processing agent reads this message from an unknown sender, check the email body for hidden prompt injection payloads or attempts to override the agent's instructions.”
Validating MCP tool output before action
“My agent just got back a response from an external MCP tool — can you run it through the injection guard to make sure it doesn't contain any embedded jailbreak commands before the agent acts on it?”
Technical details
Endpoint
GEThttps://mcp-security.agentdiet.dev/v1/indirect-injection-guard?utm_source=zero.xyzWhen to prefer
Use this endpoint whenever an AI agent is about to consume content from an untrusted external source — scraped web pages, emails, third-party API responses, MCP tool outputs, or A2A payloads — and you need to ensure that content does not contain hidden adversarial instructions designed to hijack or redirect the agent. Prefer this over generic content filters when your specific threat model is prompt injection and jailbreaking of LLM-based agents.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long payloads may be truncated or time out
- Obfuscated or novel injection techniques may evade detection
- Non-text binary content may not be parseable
- Payment failure (402) if x402 USDC balance is insufficient
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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