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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 2026-10-23).
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 structured object indicating whether prompt injection or jailbreak content was detected, along with sanitized text safe to pass downstream to an LLM or agent pipeline.
Example use cases
Sanitize scraped web content for agent
“I'm about to feed this raw HTML from an external website into my LLM pipeline — can you scan it for hidden prompt injections and return the sanitized text so my agent doesn't get hijacked?”
Guard agent inbox from malicious emails
“Before you summarize these incoming emails for me, run each one through the jailbreak firewall first — I've heard attackers are hiding adversarial instructions in email bodies to manipulate AI assistants.”
Validate MCP tool output before agent use
“My agent just got a response back from a third-party MCP tool — can you check that payload for any embedded prompt injection or jailbreak attempts before I let my agent act on it?”
Technical details
Endpoint
POSThttps://prompt-guard.agentdiet.dev/v1/llm-jailbreak-defense?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — scraped webpages, user-submitted text, third-party MCP/A2A tool responses, or emails — and you need a dedicated firewall layer to detect and strip indirect prompt injection or jailbreak payloads before they reach your LLM. Prefer this over general-purpose content filters when you specifically need LLM-targeted adversarial instruction detection.
Side effects
- Empty or missing 'text' field returns a 400 validation error
- Extremely long payloads may hit size limits or timeout
- False negatives are possible for novel or obfuscated injection techniques
- Payment required (HTTP 402) if x402 micropayment header is missing or invalid
- Non-text binary content may not be parsed correctly
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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