{"uid":"cap_Vh7s-Pespmvf1VNO-lE5i","slug":"prompt-guard-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-4a941522","name":"Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router","description":"Single-connection meta-router indexing 500+ MCP servers & A2A tools with 85% token compression and Prompt-Guard firewall. (Live x402 v2, IETF MPP & MCP endpoint at https://prompt-guard.agentdiet.dev/v1/x402-gateway)","url":"https://prompt-guard.agentdiet.dev/v1/x402-gateway?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","required":["query"],"properties":{"query":{"type":"string","minLength":1,"description":"Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify"}}},"responseSchema":{"type":"object"},"example":null,"exampleRequest":null,"tags":[],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_523lWvR15booyLLUDy__6","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.01","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":"Searches 500+ indexed MCP servers and A2A tools by capability query and returns compressed, firewall-filtered matches via a single meta-router connection","exampleAgentPrompt":"Search the MCP tool index for servers that can handle 'company enrichment' and show me the top matches with compressed metadata.","exampleUseCases":[{"title":"Discover MCP tools for SEC filings","prompt":"Search the MCP and A2A tool index for anything that handles SEC filings or financial document retrieval — I need to find the right server to route my agent to."},{"title":"Find GitHub security audit capability","prompt":"Which MCP servers in your index support GitHub security audits or code vulnerability scanning? Give me the best matches so I can wire up my swarm."},{"title":"Route agent to domain OSINT tool","prompt":"I need to do domain OSINT on a list of companies — search the tool index for MCP servers or A2A agents that specialize in that and return the top options with token-efficient descriptions."}],"resultDescription":"A list of matching MCP servers or A2A tools relevant to the capability query, returned with 85% token-compressed metadata and filtered through the Prompt-Guard firewall for safety. Results include tool names, descriptions, and routing information sufficient for an agent to select and connect to the appropriate upstream server.","failureModes":["Empty query returns validation error (minLength:1 not met)","No matching tools found for obscure or misspelled capability queries","Index staleness may cause recently deprecated MCP servers to appear in results","Prompt-Guard firewall may block queries it classifies as adversarial or unsafe","x402 payment failure results in HTTP 402 response blocking the request","Highly ambiguous queries may return low-relevance matches across unrelated domains"],"whenToPreferThis":"Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to invoke for a given capability, rather than hardcoding a specific tool. It is especially useful in swarm or multi-agent architectures where routing must be decided at runtime. Prefer this over maintaining a static tool registry when the tool landscape is large (500+), when token budget is constrained (85% compression), or when prompt injection safety via the Prompt-Guard firewall is a requirement.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:24:24.030Z","isFirstParty":false,"canonicalSlug":"prompt-guard-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-bcdfb4b9"}