{"uid":"cap_1EYu_fHvU8y0Kvgz8i6mi","slug":"sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-7d113071","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://sec-intel.agentdiet.dev/v1/system-prompt-guard)","url":"https://sec-intel.agentdiet.dev/v1/system-prompt-guard?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":"0.005","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_CyxgMhrfNz-YLDCCwUDlm","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"sec-intel.agentdiet.dev","brandSlug":"sec-intel-agentdiet-dev-mpp","brandBaseUrl":"https://sec-intel.agentdiet.dev","brandDocsUrl":null,"whatItDoes":"Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injection and jailbreak attacks, returning sanitized text.","exampleAgentPrompt":"Before processing this scraped webpage content, run it through the prompt injection firewall to check for any hidden instructions or jailbreak payloads trying to hijack you, and give me the sanitized version if it's safe.","exampleUseCases":[{"title":"Securing web scraping agent pipeline","prompt":"I have an agent that scrapes product pages and summarizes them — before it processes each page's HTML, scan it for any hidden prompt injections or instructions trying to take over the agent."},{"title":"Email phishing and injection screening","prompt":"Check this email body for embedded jailbreak attempts or hidden instructions that might try to manipulate my AI email assistant when it reads it."},{"title":"MCP tool response safety check","prompt":"My agent just got a response back from a third-party MCP tool — can you scan that payload for any indirect prompt injection before I let the agent act on it?"}],"resultDescription":"Returns a structured object containing the scan verdict (whether injection or jailbreak payloads were detected) and sanitized text with any malicious instructions stripped or neutralized, allowing safe downstream processing by the agent.","failureModes":["Empty or missing 'text' field returns a 400 validation error","Extremely large payloads may exceed size limits or time out","Obfuscated or novel injection techniques may evade detection","Payment failure via x402 returns 402 with payment requirements","Service unavailability returns 5xx errors"],"whenToPreferThis":"Choose this endpoint when your AI agent pipeline ingests untrusted external content — web pages, emails, third-party API responses, MCP tool outputs, or user-submitted text — and you need a dedicated security layer to detect and neutralize indirect prompt injection and jailbreak attempts before the content reaches your LLM. Prefer this over ad-hoc prompt hardening when operating autonomous A2A or MCP agent chains where a compromised upstream tool could redirect agent behavior.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T06:30:50.848Z","isFirstParty":false,"canonicalSlug":"sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-63e04ebf"}