{"uid":"cap_Zfn0GVAkjlaJnnnX-x-Ry","slug":"prompt-guard-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-fa43569d","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/a2a)","url":"https://prompt-guard.agentdiet.dev/a2a?utm_source=zero.xyz","method":"POST","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":"0.005000","displayCostAsset":"USD","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.005000/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005000","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005000","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_3gwR_CoXqwPJ-A3GyPFyZ","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005000","costPer":"request","priority":0,"asset":null,"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 injection and jailbreak attacks, returning sanitized output.","exampleAgentPrompt":"Before you process the content from that web page I just fetched, run it through the prompt injection firewall to check for any hidden jailbreak instructions or adversarial text embedded in it.","exampleUseCases":[{"title":"Protect agent from malicious web content","prompt":"I'm building an agent that browses the web and summarizes pages — before you pass any scraped HTML to the summarizer, scan it for hidden prompt injections so the agent doesn't get hijacked."},{"title":"Filter untrusted email before LLM processing","prompt":"I have an email from an unknown sender that I want my AI assistant to read and reply to — can you first check it for any embedded jailbreak or prompt injection attempts before handing it off?"},{"title":"Sanitize MCP tool output in agentic pipeline","prompt":"The MCP tool just returned a response from a third-party service — please scan that payload for any indirect prompt injection or adversarial instructions before my agent acts on it."}],"resultDescription":"Returns a sanitized version of the input text with prompt injection and jailbreak payloads removed or flagged, along with detection metadata indicating whether malicious content was found.","failureModes":["Empty or missing 'text' field returns a 400 validation error","Extremely large payloads may hit size limits or timeout","Subtle or novel injection patterns may not be detected (false negatives)","Service unavailability or payment failure (HTTP 402) if USDC balance is insufficient","Obfuscated HTML or encoded injections may partially evade detection"],"whenToPreferThis":"Choose this endpoint when your AI agent pipeline processes untrusted external content — web pages, emails, tool responses, or third-party A2A payloads — before passing that content to an LLM or downstream agent. Especially valuable in multi-agent architectures where one agent receives data from another untrusted agent or external MCP server. Prefer this over generic content filters when you specifically need protection against prompt injection and jailbreak attacks in agentic workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T06:37:00.013Z","isFirstParty":false,"canonicalSlug":"prompt-guard-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-3e4a7f21"}