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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 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://preflight.agentdiet.dev/v1/tool-poisoning-shield)
Output
Returns a JSON object indicating whether prompt injection or jailbreak content was detected in the input text, along with sanitized/cleaned text safe for downstream agent consumption.
Example use cases
Shield agent from poisoned web pages
“I'm about to feed this scraped webpage content into my agent — can you run it through the prompt injection firewall first to make sure there are no hidden adversarial instructions in it?”
Safe processing of untrusted emails
“My agent is reading incoming emails to summarize them, but I'm worried some could contain hidden jailbreak attempts. Can you scan this email body for any prompt injection payloads before my agent processes it?”
Validate MCP tool response before use
“My agent just got back a response from an external MCP tool and I don't fully trust the source — please check this payload for any concealed prompt injections or jailbreak instructions before we use the output.”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/tool-poisoning-shield?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent pipeline ingests content from untrusted external sources — web pages, emails, third-party API/MCP tool outputs, or user-supplied text — and you need to sanitize it before passing it to an LLM. It is especially valuable in agentic workflows where indirect prompt injection is a realistic attack vector. Prefer this over generic text filters when you specifically need jailbreak and adversarial instruction detection tuned for A2A and MCP contexts.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long inputs may time out or be truncated
- Obfuscated or encoded injections (e.g. base64, Unicode tricks) may evade detection
- Non-English or multilingual injection attempts may have lower detection accuracy
- Service unavailability returns HTTP 402 or 5xx errors
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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