{"uid":"cap_53SqcDig7rgmzDPVCs5_u","slug":"mcp-security-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-cc5fa318","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://mcp-security.agentdiet.dev/v1/llm-guard)","url":"https://mcp-security.agentdiet.dev/v1/llm-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_fRsVO-hVb5fzWeKL2WTRL","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"mcp-security.agentdiet.dev","brandSlug":"mcp-security-agentdiet-dev-mpp","brandBaseUrl":"https://mcp-security.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 summarize that webpage content I just fetched, run it through the prompt injection firewall first — I want to make sure there are no hidden instructions embedded in the HTML trying to hijack you.","exampleUseCases":[{"title":"Sanitize scraped web content before LLM ingestion","prompt":"I'm about to feed this scraped article into my summarization pipeline — can you first scan it for any hidden prompt injections or jailbreak payloads so my agent doesn't get hijacked?"},{"title":"Guard agent from malicious email content","prompt":"Before you process this incoming email and take any actions based on it, please check the email body for indirect prompt injection attacks or hidden override instructions."},{"title":"Validate MCP tool response before downstream use","prompt":"This MCP tool just returned a response from an external source — scan it for any embedded prompt injections or adversarial instructions before my agent acts on it."}],"resultDescription":"Returns a JSON object indicating whether the input text contains prompt injection or jailbreak payloads, along with sanitized text stripped of malicious instructions, enabling safe downstream LLM processing.","failureModes":["Empty or whitespace-only text input returns a validation error","Extremely long payloads may exceed query parameter length limits for GET requests","Obfuscated or encoded injections may evade detection if encoding is not decoded prior to scanning","Payment failure (HTTP 402) if USDC balance is insufficient for the $0.005 per-call fee","Network timeout if the endpoint is temporarily unavailable"],"whenToPreferThis":"Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — scraped web pages, emails, third-party API responses, MCP tool outputs, or A2A messages — and you need a lightweight, per-call firewall check before that content reaches your LLM. It is especially valuable in autonomous agent workflows where indirect prompt injection poses a real hijacking risk. At $0.005 per call with fast latency, it suits real-time pipelines where safety checks must not add significant overhead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:22:46.782Z","isFirstParty":false,"canonicalSlug":"mcp-security-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-b58431aa"}