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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-injection and jailbreak attacks, 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/system-prompt-guard)
Output
Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input, along with sanitized text with adversarial instructions removed, enabling safe downstream processing by an AI agent or LLM pipeline.
Example use cases
Securing agent web browsing pipeline
“I'm having my agent browse external websites and pass the content to an LLM — can you scan this HTML I just fetched from that site for any hidden prompt injections or jailbreak payloads before we process it?”
Filtering untrusted email before AI summarization
“Before you summarize this email for me, scan the raw email body for any hidden instructions or prompt injection attacks that might hijack your behavior.”
Validating MCP tool response safety
“My agent just got back a response from an external MCP tool — can you check this payload for any embedded jailbreak attempts or adversarial instructions before I let the agent act on it?”
Technical details
Endpoint
GEThttps://workflows.agentdiet.dev/v1/system-prompt-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is consuming untrusted external content — scraped web pages, emails, third-party API responses, MCP tool outputs, or user-submitted text — and needs to sanitize it before passing it to an LLM or acting on it, to prevent indirect prompt injection or jailbreak attacks from hijacking agent behavior.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Very large payloads may time out or be truncated
- Sophisticated obfuscated injections may evade detection
- Non-text binary content may not be parseable
- Payment not completed (402) blocks the request
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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