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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 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://prompt-guard.agentdiet.dev/v1/tool-poisoning-shield)
Output
Returns a structured object indicating whether prompt injection or jailbreak payloads were detected in the submitted text, along with a sanitized version of the input safe for downstream agent consumption.
Example use cases
Safe web browsing for autonomous agents
“I need you to check this web page content for hidden prompt injections before you summarize it — scan it with the prompt firewall and only use the sanitized output.”
MCP tool response validation
“Before you act on the result that MCP tool just returned, can you run it through the injection scanner to make sure it doesn't contain any malicious instructions trying to hijack your behavior?”
Email body sanitization pipeline
“I'm feeding customer emails into my AI pipeline — scan this email body for any embedded jailbreak attempts or prompt injection tricks before my agent processes it.”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/tool-poisoning-shield?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is about to process any untrusted external content — web pages, tool outputs, MCP responses, A2A payloads, or emails — and you need to verify it is free of hidden prompt injections or jailbreak instructions before it reaches your LLM. Particularly valuable in agentic pipelines where tool outputs are automatically fed back into the model without human review.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Very large payloads may time out or exceed input size limits
- Sophisticated obfuscated injections may evade detection (false negatives)
- Payment failure via x402 returns HTTP 402 blocking access
- Service unavailability returns 5xx with no sanitized output
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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