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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from mesh.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://mesh.agentdiet.dev/v1/llm-guard)
Output
Returns a structured object indicating whether the input text contains prompt injection or jailbreak payloads, along with sanitized text with malicious instructions removed or flagged, enabling the agent to safely proceed with clean content.
Example use cases
Guarding agent against malicious web content
“I just scraped this article to feed into my research agent — can you scan it for hidden prompt injection payloads before passing it along? Here's the raw HTML: <html>...”
Screening inbound email before LLM processing
“Before my agent processes this inbound customer email, run it through the prompt injection firewall to make sure there's no jailbreak attempt hidden in the message body.”
Validating MCP tool output before agent consumption
“My agent just got a response back from an MCP tool and I want to make sure it's clean before the agent acts on it — can you scan this tool output for any embedded adversarial instructions?”
Technical details
Endpoint
GEThttps://mesh.agentdiet.dev/v1/llm-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests untrusted external content — web pages, emails, MCP/A2A tool responses, or user-submitted text — before passing it to an LLM. It is specifically designed for the A2A/MCP agent security use case, making it more appropriate than generic content filters when defending against indirect prompt injection, jailbreak payloads hidden in HTML or markdown, or adversarial instructions embedded in tool outputs.
Side effects
- Empty or missing 'text' parameter returns validation error
- Very large payloads may timeout or be truncated
- Obfuscated or encoded injections may evade detection
- Payment required (HTTP 402) if x402 payment header not provided
- False positives may flag legitimate instructional text as injections
- Non-English injection attempts may have lower detection accuracy
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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