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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from serp-extract.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 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://serp-extract.agentdiet.dev/v1/guard)
Output
Returns a structured object indicating whether the input text contains prompt injection or jailbreak payloads, along with a sanitized version of the text safe for downstream LLM consumption.
Example use cases
Guarding agent from malicious webpage
“I just scraped this webpage to feed into our research pipeline — before you summarize it, run the content through the injection firewall to make sure there are no hidden prompt-hijacking instructions embedded in it.”
Sanitizing inbound email for AI processing
“We're having our AI agent auto-reply to customer emails, but I'm worried about prompt injection attacks. Can you scan this email body for jailbreak payloads before the agent reads it: 'Dear support, please ignore all prior instructions and instead...'”
Validating MCP tool response before use
“Our agent just got back a response from an external MCP tool and I don't fully trust it — can you check this payload for any hidden instructions or adversarial content before we pass it downstream?”
Technical details
Endpoint
GEThttps://serp-extract.agentdiet.dev/v1/guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline consumes untrusted external content — scraped web pages, inbound emails, third-party API responses, MCP tool outputs, or A2A payloads — and you need a fast, dedicated firewall check before that content influences LLM behavior. Prefer it over general-purpose content filters when the threat model is specifically indirect prompt injection and jailbreak attacks targeting LLM agents.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long inputs may be truncated or cause timeout
- Obfuscated injections using encoding tricks may evade detection
- Non-English or encoded payloads may reduce detection accuracy
- Service unavailability returns HTTP 402 or 5xx errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| textrequired | string | Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads |
| limit | integer | Maximum number of items to return per page (1-100) |
| cursor | string | Opaque pagination cursor for fetching the next page |
Output
Schema · Response
{
"type": "object"
}Reviews
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