{"uid":"cap_TbBLTyckNNs47kBYc_LFA","slug":"prompt-guard-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-57c2b7db","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/llm-guard)","url":"https://prompt-guard.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_IUx-kPKthon_QoU4jkSVE","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 injections and jailbreak attempts, returning sanitized output.","exampleAgentPrompt":"Before you summarize that webpage I just fetched, run its raw HTML through the prompt injection firewall to make sure there are no hidden instructions trying to hijack you.","exampleUseCases":[{"title":"Safe web scraping for agent pipelines","prompt":"I just scraped the HTML from that external news site — can you scan it for hidden prompt injections before you extract the article text and pass it along to the summarizer?"},{"title":"Email content safety check","prompt":"Before processing this inbound customer email through our support agent, screen the body text for any embedded jailbreak or prompt injection attempts."},{"title":"MCP tool response validation","prompt":"The MCP tool just returned a response from that third-party server — run it through the prompt injection firewall before we let the agent act on it."}],"resultDescription":"Returns a sanitized version of the submitted text with prompt injections and jailbreak payloads removed or flagged, along with detection metadata indicating whether malicious content was found.","failureModes":["Empty or missing 'text' parameter returns a 400 validation error","Extremely large payloads may be rejected or truncated","Novel or obfuscated injection techniques may evade detection","Non-text binary content may not be processed correctly","Service unavailability returns 5xx errors","Payment not completed via x402 returns 402 Payment Required"],"whenToPreferThis":"Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — web pages, emails, third-party API responses, MCP tool outputs, or A2A agent messages — and you need to sanitize that content before passing it to an LLM. Prefer this over manual filtering when you need automated, scalable protection against indirect prompt injection and jailbreak attempts in agentic workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:25:47.654Z","isFirstParty":false,"canonicalSlug":"prompt-guard-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-3e4a7f21"}