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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from preflight.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 content.
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://preflight.agentdiet.dev/v1/mcp-injection-firewall)
Output
Returns an object indicating whether a prompt injection or jailbreak attempt was detected in the input, along with sanitized text safe for downstream agent processing. Likely includes detection flags, threat classification, and the cleaned version of the input payload.
Example use cases
Sanitizing scraped web content for agent pipelines
“I'm about to feed this scraped article into my agent — can you scan it for hidden prompt injections first? Here's the raw HTML text I pulled from the page.”
Screening MCP tool responses before execution
“My agent just got back a response from an external MCP tool and I want to make sure it doesn't contain any jailbreak or indirect prompt injection before we act on it — can you run the response text through the injection firewall?”
Checking user-submitted emails for adversarial instructions
“A user forwarded me this email and my agent is going to summarize it — before it does, please scan the email body for any hidden prompt injection attacks or jailbreak payloads so my agent doesn't get hijacked.”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/mcp-injection-firewall?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — scraped web pages, user emails, third-party MCP tool responses, or A2A payloads — and you need a dedicated security layer to detect and neutralize hidden prompt injection or jailbreak attempts before that content reaches your LLM or triggers downstream actions. Prefer it over generic content filters when the specific threat model is adversarial instruction injection targeting AI agents.
Side effects
- Empty or missing 'text' parameter returns a 400 validation error
- Very large input payloads may time out or be truncated
- Sophisticated obfuscated injections may evade detection (false negatives)
- Payment failure via x402 returns HTTP 402 before processing occurs
- Malformed HTML may cause parsing errors in the scanner
- Rate limiting may apply under high-frequency usage
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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