{"uid":"cap_8In-opaCvOPp566WOuImG","slug":"arxiv-digest-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-535b04d8","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://arxiv-digest.agentdiet.dev/api/mcp/audit)","url":"https://arxiv-digest.agentdiet.dev/api/mcp/audit?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_7WQTbtqxtF1pQUn7-ZWpd","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"arxiv-digest.agentdiet.dev","brandSlug":"arxiv-digest-agentdiet-dev-mpp","brandBaseUrl":"https://arxiv-digest.agentdiet.dev","brandDocsUrl":null,"whatItDoes":"Searches an index of 500+ MCP servers and A2A tools by capability query, returning matching endpoints with token-compressed metadata via a prompt-injection firewall.","exampleAgentPrompt":"Search the A2A and MCP tool index for servers that can do SEC filings or company enrichment — I want to see what's available with compressed metadata.","exampleUseCases":[{"title":"Finding a GitHub security audit tool","prompt":"Search the MCP tool registry for any servers that can do GitHub security audits or code vulnerability scanning — list what's available."},{"title":"Discovering context compression agents","prompt":"I need to find MCP servers or A2A tools that support context compression — can you search the tool index for that capability?"},{"title":"Locating DEX and on-chain intelligence tools","prompt":"Search the agent tool directory for anything related to DEX liquidity, token intelligence, or on-chain risk analysis and tell me what endpoints are available."}],"resultDescription":"Returns a JSON object containing matching MCP servers and A2A tools from the 500+ endpoint index, with token-compressed capability metadata filtered through a Prompt-Guard firewall to prevent prompt injection from upstream tool responses.","failureModes":["Missing or empty 'query' parameter returns a 400/validation error","No matching tools found for the query returns an empty result set","Upstream MCP server index temporarily unavailable causes degraded or empty results","Malformed endpoint URL when used in verification mode returns a format error","Payment not completed via x402 results in HTTP 402 response blocking the query"],"whenToPreferThis":"Choose this endpoint when you need to dynamically discover which MCP servers or A2A agent tools exist for a given capability, rather than hardcoding a specific tool. It is especially useful when building swarm or meta-agent architectures that need to route tasks to the best available tool, when you want 85% token savings on tool metadata, or when you need prompt-injection protection when proxying to external MCP servers.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:26:04.948Z","isFirstParty":false,"canonicalSlug":"arxiv-digest-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-0860614f"}