{"uid":"cap_LL49Nx-J6irZa1r46Lhcf","slug":"prompt-guard-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-a7cf658a","name":"A2A Indirect Prompt-Injection & Jailbreak Firewall","description":"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-shield)","url":"https://prompt-guard.agentdiet.dev/v1/prompt-shield?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","required":["text"],"properties":{"text":{"type":"string","minLength":1,"description":"Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads"}}},"responseSchema":{"type":"object"},"example":null,"exampleRequest":null,"tags":[],"displayCostAmount":"0.005","displayCostAsset":"USD","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_za2sk0w0PxH27IFlsBndo","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"prompt-guard.agentdiet.dev","brandSlug":"prompt-guard-agentdiet-dev-mpp","brandBaseUrl":"https://prompt-guard.agentdiet.dev","brandDocsUrl":null,"whatItDoes":"Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injections and jailbreak attempts, returning sanitized output.","exampleAgentPrompt":"Before you process this web page I just scraped, run it through the prompt injection firewall to check for any hidden jailbreak instructions or adversarial payloads embedded in the text.","exampleUseCases":[{"title":"Sanitize scraped web content for agent","prompt":"I'm about to feed this scraped article into my agent pipeline — can you first check it for any hidden prompt injection or jailbreak instructions before passing it along?"},{"title":"Protect agent from malicious email","prompt":"This email came from an unknown sender and my agent is about to summarize it — please scan the full email body for embedded adversarial instructions or jailbreak payloads first."},{"title":"Validate MCP tool response safety","prompt":"My agent just got back a response from an external MCP tool — before it acts on it, scan that payload for any indirect prompt injections or hidden instructions targeting my agent."}],"resultDescription":"Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input text, along with sanitized text safe for downstream agent consumption.","failureModes":["Empty or missing 'text' parameter returns a validation error","Extremely long inputs may time out or be truncated","False negatives possible for novel or obfuscated injection techniques","Service may be unavailable if payment (x402 USDC) is not settled","Non-text binary content may not be parseable"],"whenToPreferThis":"Choose this endpoint when your AI agent is about to process untrusted external content — scraped web pages, third-party emails, MCP tool responses, or A2A payloads — and you need a dedicated security check for prompt injection and jailbreak attempts before that content influences agent behavior. Prefer this over generic content filters when the threat model is specifically adversarial LLM manipulation rather than spam or toxicity.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:23:37.934Z","isFirstParty":false,"canonicalSlug":"prompt-guard-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-3e4a7f21"}