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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from prompt-guard.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.
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://prompt-guard.agentdiet.dev/v1/rag-poison-shield)
Output
Returns an object containing the scan result for the submitted text, including whether prompt injection or jailbreak content was detected and a sanitized version of the input text safe for downstream LLM consumption.
Example use cases
Protecting RAG pipeline from poisoned documents
“I'm about to feed this document I pulled from the web into my RAG system — can you scan it for hidden prompt injection or jailbreak payloads before I index it?”
Sanitizing email before agent processing
“I have an email body here that my agent needs to read and act on, but I don't trust the sender — please run it through the prompt-injection firewall first and give me the sanitized version.”
Guarding MCP tool response from adversarial content
“This MCP tool just returned a response with some suspicious-looking text — scan it for embedded jailbreak instructions before we pass it along to the next step in the workflow.”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/rag-poison-shield?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent pipeline ingests content from untrusted external sources — scraped web pages, emails, third-party API responses, MCP tool outputs, or A2A payloads — and you need to detect and neutralize hidden prompt injection or jailbreak instructions before they reach your LLM. It is especially valuable in RAG pipelines and multi-agent swarms where adversarial content injection is a realistic attack vector.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Very large payloads may exceed size limits or time out
- False negatives are possible for novel or obfuscated injection techniques
- Service unavailability returns HTTP 402 or 5xx if payment or quota issues arise
- Malformed HTML that can't be parsed may produce incomplete sanitization
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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