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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from llms-generator.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://llms-generator.agentdiet.dev/v1/injection-firewall)
Output
Returns a sanitized version of the submitted text with detected prompt injection or jailbreak content flagged or removed, along with detection metadata indicating whether malicious instructions were found.
Example use cases
Sanitize scraped web page before agent processing
“I'm about to feed you the HTML from this third-party website, but first scan it through the injection firewall to strip out any hidden prompt-hijacking instructions before you summarize it for me.”
Screen incoming email for jailbreak payloads
“Before my AI email assistant reads and acts on this incoming message, run the full email body through the prompt-injection firewall and let me know if it's trying to hijack the agent.”
Validate MCP tool response before execution
“That MCP server just returned a response — can you pass it through the A2A injection firewall to check for any embedded adversarial instructions before we act on it?”
Technical details
Endpoint
GEThttps://llms-generator.agentdiet.dev/v1/injection-firewall?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is processing untrusted external content — scraped web pages, emails, MCP server responses, or A2A payloads — before acting on it. It is specifically designed for the indirect prompt injection threat model where adversarial instructions are hidden inside content the agent reads, rather than directly entered by a user. Prefer it over general content moderation APIs when the threat model is agent hijacking rather than harmful user-generated content.
Side effects
- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long payloads may exceed query-string limits since input is passed as a GET query parameter
- Ambiguous or benign-looking injections may be missed (false negatives)
- Legitimate technical instructions in content may be incorrectly flagged (false positives)
- Service unavailability returns HTTP 402 or 5xx if payment or backend fails
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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