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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 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://workflows.agentdiet.dev/v1/llm-guard)
Output
Returns a JSON object containing the scan result for the submitted text, including detection of hidden prompt injection or jailbreak payloads and a sanitized version of the input safe for LLM consumption.
Example use cases
Agent pipeline web scrape guard
“I'm building an agent that fetches web pages and summarizes them — before each page hits the LLM, scan the raw HTML for any hidden prompt injection instructions so the model can't be hijacked.”
Email-to-agent inbox firewall
“My AI assistant reads incoming emails and acts on them autonomously. Can you screen this email body for embedded jailbreak or prompt injection attacks before the agent processes it?”
MCP tool response sanitization
“This is the raw response from an external MCP tool my agent just called — check it for any indirect prompt injection payloads and return the cleaned version I can safely pass to my LLM.”
Technical details
Endpoint
GEThttps://workflows.agentdiet.dev/v1/llm-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent ingests untrusted external content — web pages, emails, third-party API responses, MCP tool outputs, or A2A payloads — and needs a dedicated firewall layer before that content reaches its LLM context. Prefer it over generic content filters when the threat model specifically involves indirect prompt injection and jailbreaking of autonomous agents.
Side effects
- Missing required 'text' parameter returns a 400 or validation error
- Empty string input rejected due to minLength:1 constraint
- Overly long payloads may be truncated or time out
- Payment not fulfilled (x402 payment required) results in 402 response before scan is performed
- Ambiguous or heavily obfuscated injections may evade detection
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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