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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from alpha-stream.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://alpha-stream.agentdiet.dev/v1/llm-guard)
Output
Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input text, along with the sanitized version of the text with malicious instructions removed or flagged.
Example use cases
Safe web scraping for agent pipeline
“I'm about to feed this scraped HTML from an external site into my agent — can you scan it for hidden prompt injections first and give me only the clean, sanitized text?”
Screening inbound emails for AI hijacking
“This email came from an unknown sender and I want my agent to summarize it — before it does, can you check the email body for any jailbreak attempts or embedded adversarial instructions?”
Validating third-party MCP tool response
“My agent just got a response back from a third-party MCP tool — can you run it through the prompt injection firewall to make sure there are no hidden instructions trying to hijack my agent's behavior?”
Technical details
Endpoint
GEThttps://alpha-stream.agentdiet.dev/v1/llm-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent is processing untrusted external content — scraped web pages, user-submitted text, third-party API responses, MCP tool outputs, or A2A payloads — before feeding them into an LLM context. It is specifically designed for AI agent pipelines that need to neutralize indirect prompt injection and jailbreak attacks embedded in content from the open web or untrusted sources.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Very large payloads may exceed size limits or timeout
- False negatives possible for novel or obfuscated injection techniques
- Service unavailability returns HTTP 402 or 5xx errors
- Non-text binary content may not be properly analyzed
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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