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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from prompt-guard.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://prompt-guard.agentdiet.dev/v1/prompt-injection-shield)
Output
Returns an object containing the sanitized version of the input text with any detected prompt injection or jailbreak payloads removed or flagged, along with detection metadata indicating whether threats were found.
Example use cases
Safe web scraping for agent pipelines
“I just scraped this HTML from an untrusted news site to feed into my agent — can you run it through the prompt-injection firewall first and give me the clean text so I know it won't hijack my agent's behavior?”
Filtering MCP tool responses
“My agent just got back a response from an MCP tool I don't fully trust. Can you scan that response for any hidden prompt injections or jailbreak payloads before I let my agent act on it?”
Email body safety check before agent processing
“I'm building an agent that reads and replies to emails, but I'm worried about indirect injection attacks. Can you scan this incoming email body for any hidden instructions that might try to manipulate my agent?”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/prompt-injection-shield?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is about to process content from untrusted external sources — scraped web pages, user-submitted text, third-party MCP tool responses, A2A agent payloads, or emails — and you need to detect and strip hidden prompt injections or jailbreak attempts before they can influence agent behavior. It is especially valuable in agentic pipelines where an attacker-controlled document could redirect an autonomous agent's actions.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long payloads may time out or be truncated
- Obfuscated injections using novel encoding may evade detection
- Non-text binary content passed as text may cause parsing errors
- 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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