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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from workflows.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 text.
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://workflows.agentdiet.dev/v1/prompt-injection-shield)
Output
Returns a JSON object containing the scan result for the submitted text, including detection of any hidden prompt injection or jailbreak payloads and a sanitized version of the input text safe for downstream agent consumption.
Example use cases
Sanitize scraped web content for agent
“I'm about to feed this scraped article into my AI pipeline — can you first scan it for any hidden prompt injections or adversarial instructions and return the clean text?”
Screen inbound emails for injection attacks
“This email came from an untrusted sender and my agent will read it — please check it for embedded prompt injection payloads or jailbreak attempts before it touches my LLM.”
Validate MCP tool response before agent use
“My agent just got back a response from an external MCP tool — can you run it through the injection firewall to make sure there are no hidden instructions trying to hijack my agent's behavior?”
Technical details
Endpoint
GEThttps://workflows.agentdiet.dev/v1/prompt-injection-shield?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent needs to safely consume content from untrusted external sources — scraped web pages, inbound emails, third-party MCP/A2A tool responses — before passing that content to an LLM. It is especially valuable in multi-agent pipelines where one agent's output becomes another's input, creating indirect injection attack surfaces. Prefer it over generic content filters when the specific threat model is adversarial prompt injection or jailbreak payloads targeting LLM behavior.
Side effects
- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long text payloads may be truncated or rejected
- Service unavailable (502/503) if the upstream firewall model is down
- Payment required (402) if no valid x402 micropayment header is provided
- False negatives: novel or obfuscated injection techniques may not be detected
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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