{"uid":"cap_tH7mDjUS1XAdWDrSnkIXD","slug":"hn-pulse-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-firewall-02345d84","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://hn-pulse.agentdiet.dev/v1/llm-guard)","url":"https://hn-pulse.agentdiet.dev/v1/llm-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_3Uyc4WfUWVR24poSOIaJl","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"hn-pulse.agentdiet.dev","brandSlug":"hn-pulse-agentdiet-dev-mpp","brandBaseUrl":"https://hn-pulse.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 process that web page I just scraped, run the raw HTML through the prompt-injection firewall and give me back the sanitized version — I don't want any hidden instructions hijacking you.","exampleUseCases":[{"title":"Securing scraped web content for agents","prompt":"I just scraped this blog post to feed into my research agent, but I'm worried it might have hidden prompt injections embedded in the HTML — can you scan it and give me the sanitized text before I pass it along?"},{"title":"Guarding agent email processing pipeline","prompt":"My agent is about to read and act on these customer emails, but some of them look suspicious. Can you check each email body for hidden jailbreak payloads or injected instructions before the agent processes them?"},{"title":"Validating MCP tool response before use","prompt":"My agent just got back a response from an external MCP tool I don't fully trust — can you run that response through the prompt-injection firewall to make sure there's nothing malicious hidden in it before I let my agent act on it?"}],"resultDescription":"Returns a JSON object containing the scan result, which includes whether a prompt injection or jailbreak payload was detected and a sanitized version of the input text safe for downstream LLM consumption.","failureModes":["Empty or missing 'text' field returns a validation error","Extremely large payloads may time out or be rejected","Payment failure (HTTP 402) if x402 USDC payment is not attached or insufficient","Malformed JSON body returns a 400 error","Ambiguous or borderline injections may produce false negatives"],"whenToPreferThis":"Choose this endpoint when your agent pipeline ingests content from untrusted external sources — scraped web pages, third-party API responses, emails, MCP tool outputs, or A2A payloads — and you need to detect and neutralize hidden prompt injections or jailbreak attempts before they reach your LLM. Prefer this over generic content filters when you specifically need protection against adversarial AI-targeting attacks rather than general toxicity or spam filtering.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T06:36:49.628Z","isFirstParty":false,"canonicalSlug":"hn-pulse-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-firewall-a87b8dff"}