{"uid":"cap_EKVsVhIvQHePdBTpM1mrA","slug":"prompt-guard-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-68557cc7","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/system-prompt-guard)","url":"https://prompt-guard.agentdiet.dev/v1/system-prompt-guard?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_aHV4E1JVQc3Nm92aqb0jj","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 injection and jailbreak attacks, returning sanitized content","exampleAgentPrompt":"Before you process this scraped webpage, run it through the prompt injection firewall to check for any hidden instructions or jailbreak attempts embedded in the text.","exampleUseCases":[{"title":"Sanitizing scraped web content for agents","prompt":"I'm about to feed this webpage content into my AI pipeline — can you scan it for hidden prompt injections or jailbreak instructions first and give me the sanitized version?"},{"title":"Screening inbound emails before LLM processing","prompt":"Before you summarize this customer email, check it for any embedded prompt injection attacks that might try to hijack your behavior."},{"title":"Validating MCP tool response before action","prompt":"This MCP tool just returned a response — can you run it through the prompt injection firewall before I let the agent act on it? I want to make sure it doesn't contain hidden instructions."}],"resultDescription":"Returns a JSON object containing the scan result for the submitted text, including whether prompt injection or jailbreak payloads were detected and a sanitized version of the content safe for downstream LLM processing.","failureModes":["Empty or missing 'text' parameter returns a validation error","Very long inputs may be truncated or rejected","Novel or obfuscated injection techniques may not be detected (false negatives)","Payment failure (HTTP 402) if USDC balance is insufficient","Service unavailability returns 5xx error"],"whenToPreferThis":"Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — scraped web pages, user-submitted emails, third-party tool responses, or A2A messages — before passing that content to an LLM. Especially valuable in agentic workflows where a compromised tool response could redirect agent behavior. Use it as a middleware guard layer in MCP or A2A architectures.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:23:02.215Z","isFirstParty":false,"canonicalSlug":"prompt-guard-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-3e4a7f21"}