Check whether an MCP server is up and usable right now, by registry name or by URL. Free, no key.
Listed on its own since 2026-09-23. Until then it was part of agentcheck, where its earlier checks remain.
Everything here was measured by our prober or read from a registry. Nothing is self-reported.
Not distributed through a package registry we index.
| when | check | result | http | latency | detail |
|---|---|---|---|---|---|
| 50 min ago | mcp initialize | ok | 200 | 268 ms | server mcp-liveness 0.3.0 · protocol 2025-06-18 · 5 tools |
| 2 h ago | mcp initialize | ok | 200 | 259 ms | server mcp-liveness 0.3.0 · protocol 2025-06-18 · 5 tools |
| 3 h ago | mcp initialize | ok | 200 | 279 ms | server mcp-liveness 0.3.0 · protocol 2025-06-18 · 5 tools |
| 4 h ago | mcp initialize | ok | 200 | 134 ms | server mcp-liveness 0.3.0 · protocol 2025-06-18 · 5 tools |
| 5 h ago | mcp initialize | ok | 200 | 299 ms | server mcp-liveness 0.3.0 · protocol 2025-06-18 · 5 tools |
| 6 h ago | mcp initialize | ok | 200 | 127 ms | server mcp-liveness 0.3.0 · protocol 2025-06-18 · 5 tools |
| 7 h ago | mcp initialize | ok | 200 | 276 ms | server mcp-liveness 0.3.0 · protocol 2025-06-18 · 5 tools |
| 8 h ago | mcp initialize | ok | 200 | 178 ms | server mcp-liveness 0.3.0 · protocol 2025-06-18 · 5 tools |
| 9 h ago | mcp initialize | ok | 200 | 147 ms | server mcp-liveness 0.3.0 · protocol 2025-06-18 · 5 tools |
| 10 h ago | mcp initialize | ok | 200 | 136 ms | server mcp-liveness 0.3.0 · protocol 2025-06-18 · 5 tools |
Attributed to the source that supplied each field. Treated as claims, not facts.
One initialize call to the server endpoint, the way a stock client connects, and a plain verdict: usable, needs a credential (and whether one can be obtained in-band), charged (HTTP 402), unreachable (with the cause), local only, or not listed. Works with an official MCP registry name or a URL; private and cloud-metadata addresses are refused. It also reports which tools were added, removed or changed between monthly snapshots, from a census of every remote listing in the official MCP registry. Free, no key, 30 URL checks a minute per caller.
Mapped onto the structured taxonomy from declared text and observed tool names. Confidence shown for derived entries.
Every source is kept verbatim. Field changes are logged as events.