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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/llm-jailbreak-defense)
Output
Returns a JSON object indicating whether prompt injection or jailbreak content was detected in the input text, along with sanitized text with malicious instructions removed or flagged, allowing the agent to safely consume the cleaned output.
Example use cases
Agent pipeline web scraping guard
“I'm having my agent scrape product reviews from third-party sites — can you scan this page content for any hidden prompt injections before we pass it to the summarizer? Here's the raw text from the page.”
Email assistant safety filter
“My AI email assistant is about to process this incoming message from an unknown sender. Can you check the email body for any prompt injection or jailbreak attempts hidden in the text before the assistant reads it?”
MCP tool response sanitization
“My agent just got back a response from an external MCP tool and I want to make sure it's not carrying any hidden instructions trying to override my agent's behavior — can you scan this payload and give me the sanitized version?”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/llm-jailbreak-defense?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is consuming content from untrusted external sources — scraped web pages, third-party MCP tool responses, A2A agent payloads, or user-submitted emails — and you need to detect and neutralize hidden prompt injection or jailbreak attempts before that content reaches your LLM. Prefer this over generic content filters when you specifically need injection-aware sanitization tailored to agentic LLM pipelines operating under the A2A and MCP protocols.
Side effects
- Empty or missing 'text' parameter returns a 400 validation error
- Very large payloads may time out or be truncated
- Sophisticated obfuscated injections may evade detection (false negatives)
- Payment not attached or insufficient funds triggers HTTP 402 response
- Service unavailable returns 5xx with no sanitized output
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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