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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.
Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injections 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://mcp-security.agentdiet.dev/v1/guard)
Output
Returns a JSON object containing the scan result for the submitted text, including whether a prompt injection or jailbreak payload was detected and the sanitized version of the input safe for downstream agent consumption.
Example use cases
Guarding agent from malicious web content
“I just scraped this web page to feed into my pipeline — before you use it, can you scan the raw HTML for any hidden prompt injections or jailbreak payloads embedded in it?”
Sanitizing inbound MCP tool responses
“This MCP tool just returned a response from a third-party server — can you run it through the prompt injection firewall before passing it along, to make sure there are no adversarial instructions hidden inside?”
Screening user-submitted emails for AI attacks
“A user forwarded this email to my AI assistant — can you check whether it contains any indirect prompt injection attempts or jailbreak text before my agent reads and acts on it?”
Technical details
Endpoint
POSThttps://mcp-security.agentdiet.dev/v1/guard?utm_source=zero.xyzWhen to prefer
Use this endpoint whenever your agent is about to consume content from an untrusted external source — scraped web pages, user-submitted emails, third-party MCP or A2A tool responses — before passing that content to an LLM or downstream agent step. It is specifically designed for the indirect prompt injection threat vector (adversarial instructions embedded in data, not direct user input) and supports idempotent retries via Idempotency-Key header.
Side effects
- Empty or missing 'text' field returns a 400 validation error
- Extremely long payloads may hit size or timeout limits
- False negatives: novel or obfuscated injection techniques may not be caught
- Payment not completed (HTTP 402) blocks the request if x402 funds are unavailable
- Ambiguous or benign-looking injections may be incorrectly flagged as safe
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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