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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from 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 attacks, 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://agentdiet.dev/v1/system-prompt-guard)
Output
Returns a JSON object containing the sanitized version of the input text with any detected prompt injection or jailbreak payloads removed or flagged, allowing agents to safely consume the cleaned content.
Example use cases
Securing scraped web content for agents
“I need you to scan this webpage content I just fetched before you summarize it — check it for any hidden prompt injections or adversarial instructions embedded in the HTML that could hijack your behavior.”
Filtering malicious email payloads
“Before you parse and act on this email I received, please run it through the prompt-injection firewall to make sure there are no jailbreak instructions hidden in the body text.”
Sanitizing MCP tool responses
“This MCP tool just returned a response with some suspicious-looking text — can you scan it for hidden prompt injection payloads before we pass it further down the agent pipeline?”
Technical details
Endpoint
GEThttps://agentdiet.dev/v1/system-prompt-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent needs to safely ingest untrusted external content — such as scraped web pages, emails, third-party API responses, MCP tool outputs, or A2A payloads — before processing them, to prevent indirect prompt injection and jailbreak attacks from hijacking agent behavior.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long payloads may exceed input limits
- Obfuscated or novel injection techniques may not be detected
- Non-text binary content may not be parseable
- Rate limiting or payment failures via x402 if USDC balance is insufficient
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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