{"uid":"cap_IH_UDeSo-2TC_PZQzAIdG","slug":"toolweather-mcp-server-safety-check-e1f572c2","name":"Toolweather MCP Server Safety Check","description":"Toolweather suite: is this MCP server healthy and safe to call right now? Live health verdicts for ~2,000 public MCP servers from the official registry, checked every 15 minutes, plus working alternatives. The same MCP endpoint also exposes Upstream tools (check_api_status, check_model_deprecation, list_recent_api_changes, list_providers, get_digest) for AI/dev API status and model deprecations; Upstream's own REST/x402 API remains at https://upstream.toolweather.workers.dev. Free tier: 1,000 calls/day per key or 50/day anonymous with no key; get a key instantly with POST /v1/keys (no email or signup). Change alerts: watch up to 3 servers per free key and receive signed HTTPS webhooks. Python urllib users: Cloudflare returns HTTP 403 'error code: 1010' for the default Python-urllib User-Agent; send any other User-Agent header. Pricing: free 1,000 calls/day per key (or 50/day anonymous, no key) and 3 watches; over quota, HTTP 402 x402 v2 exact pay-per-call (USDC on Base): $0.001/check, $0.003/live recheck, $0.01/batch of 25, $0.05 per extra watch per 30 days. No subscription. See /v1/pricing.","url":"https://toolweather.toolweather.workers.dev/x402/is_safe_to_call?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["server"],"properties":{"tool":{"type":"string","description":"Optional tool name to confirm"},"server":{"type":"string","description":"MCP server registry name or remote URL"}}},"responseSchema":{"type":"object","required":["summary","verdict"],"properties":{"summary":{"type":"string"},"verdict":{"enum":["safe","caution","unsafe","unknown"],"type":"string"},"checked_at":{"type":"string"},"recommended_action":{"type":"string"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_MYMRms3kaWziCSX21lpEj","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a live safety verdict (safe/caution/unsafe/unknown) for a given MCP server, indicating whether it is healthy and safe to call right now","exampleAgentPrompt":"Before we proceed, check if the 'brave-search' MCP server is safe to call right now — I don't want to waste time on a broken tool.","exampleUseCases":[{"title":"Pre-flight check before agent tool call","prompt":"Check if the 'github' MCP server is healthy and safe to call before my agent tries to use it — give me the verdict and any recommended action."},{"title":"Validating a remote MCP URL for safety","prompt":"Is the MCP server at https://mcp.example.com/sse safe to call right now? I want to know if it's up before I wire it into my workflow."},{"title":"Confirming a specific tool is available","prompt":"I want to use the 'search' tool on the 'brave-search' MCP server — can you verify it's safe and that tool is actually working?"}],"resultDescription":"A JSON object containing: a 'verdict' enum ('safe', 'caution', 'unsafe', or 'unknown'), a human-readable 'summary' explaining the verdict, a 'checked_at' ISO timestamp of the last health check (refreshed every 15 minutes), and a 'recommended_action' string advising what to do next.","failureModes":["HTTP 402 when daily quota exceeded — must pay $0.001 USDC via x402 per call or upgrade key","HTTP 403 with Cloudflare error code 1010 when using Python urllib default User-Agent — fix by sending any other User-Agent header","Unknown verdict returned when server has not been checked yet or is not in the ~2,000 monitored registry servers","Invalid or unresolvable server name/URL returns error or unknown verdict","Anonymous callers limited to 50 calls/day; key-holders get 1,000/day"],"whenToPreferThis":"Use this endpoint when an AI agent or developer workflow needs to confirm that a specific MCP server is healthy before invoking it, especially in automated pipelines where calling a broken server would waste compute or cause cascading failures. It covers ~2,000 official MCP registry servers checked every 15 minutes, making it the most comprehensive pre-call health gate available. Prefer it over generic uptime monitors when you need an MCP-specific safety verdict with actionable recommendations.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T06:35:50.011Z","isFirstParty":false,"canonicalSlug":"toolweather-mcp-server-safety-check-e1f572c2"}