{"uid":"cap_eS2VImncwP6sDLDcmKiah","slug":"arxiv-digest-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-24d5bbab","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://arxiv-digest.agentdiet.dev/v1/prompt-firewall)","url":"https://arxiv-digest.agentdiet.dev/v1/prompt-firewall?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_e0ZDTKAkxbgh1jDUiXPmM","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"arxiv-digest.agentdiet.dev","brandSlug":"arxiv-digest-agentdiet-dev-mpp","brandBaseUrl":"https://arxiv-digest.agentdiet.dev","brandDocsUrl":null,"whatItDoes":"Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injections and jailbreak attempts, returning sanitized text.","exampleAgentPrompt":"Before you process this webpage I just scraped, can you run it through the prompt injection firewall to check for any hidden instructions or jailbreak attempts and give me the sanitized version?","exampleUseCases":[{"title":"Sanitizing scraped web content for agents","prompt":"I'm about to feed this scraped webpage into my research agent — can you first scan it for any hidden prompt injections or adversarial instructions and return the safe version?"},{"title":"Screening inbound emails before agent processing","prompt":"This customer email is going to be handled by my support agent — check it for any embedded jailbreak or prompt injection attempts before passing it along."},{"title":"Validating MCP tool output before agent action","prompt":"My agent just got a response back from an external MCP tool. Can you run it through the prompt injection firewall to make sure it hasn't been poisoned with hidden instructions before the agent acts on it?"}],"resultDescription":"Returns a JSON object containing the sanitized version of the input text with any detected prompt injection or jailbreak payloads removed or flagged, enabling safe downstream processing by AI agents.","failureModes":["Missing required 'text' parameter returns a 400 validation error","Empty string input rejected due to minLength:1 constraint","Very large payloads may be truncated or time out","Obfuscated or novel injection techniques may not be detected","Service unavailability returns 503 or payment-related 402 errors"],"whenToPreferThis":"Choose this endpoint when your AI agent is about to process untrusted external content — scraped web pages, incoming emails, MCP/A2A tool responses, or user-submitted text — and you need a fast, per-call firewall check before that content influences agent behavior. Particularly valuable in agentic pipelines where indirect prompt injection is a real threat vector and you want a dedicated security layer rather than relying on the LLM's own defenses.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T12:30:02.585Z","isFirstParty":false,"canonicalSlug":"arxiv-digest-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-63370fac"}