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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/indirect-injection-guard)
Output
Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input text, along with sanitized text safe for downstream agent consumption.
Example use cases
Securing web-scraped content for agents
“I just scraped a bunch of web pages to feed into my agent pipeline — can you run each page's text through the prompt injection firewall before the agent reads it? I need to make sure none of them contain hidden instructions trying to hijack my agent.”
Screening incoming emails for LLM processing
“My agent is about to summarize a batch of customer emails, but some might be malicious. Can you scan this email body for any embedded prompt injections or jailbreak payloads before the agent processes it?”
Validating MCP tool responses before consumption
“My agent just got back a response from an external MCP tool and I don't fully trust the source. Can you run that response text through the indirect injection guard to make sure there are no hidden override instructions before my agent acts on it?”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/indirect-injection-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — web pages, emails, third-party API responses, MCP tool outputs, or A2A payloads — and you need a dedicated firewall step to detect and strip hidden prompt injections or jailbreak instructions before that content reaches your LLM. Prefer this over generic content filters when you specifically need prompt-injection-aware scanning tuned to agent security threats.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long text inputs may exceed processing limits
- Obfuscated or encoded injections may evade detection if not decoded first
- Payment failure via x402 returns HTTP 402 before scan is performed
- Ambiguous or borderline content may produce false positives or false negatives
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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