Is this MCP tool safe to call right now?

Live health, breaking-change and spec-readiness checks for remote MCP servers in the official registry. Read-only probes every 15 minutes.

2,317servers monitored

48%healthy (open)

49%behind auth

187 msmedian handshake

16,837tools tracked

Most reliable servers

Server	Uptime	Latency	Tools	Checks
com.ufcalendar/fight-api api.ufcalendar.com/mcp	100%	169 ms	47	6
fun.oaia/arena api.oaia.fun/mcp	100%	375 ms	7	6
com.moltlinestudio/dropship mcp.moltlinestudio.com/dropship	100%	98 ms	6	5
com.moltlinestudio/shopify mcp.moltlinestudio.com/shopify	100%	112 ms	6	5
cloud.dchub/mcp-server dchub.cloud/mcp/grok	100%	185 ms	11	5
com.kythene/kythene kythene.com/mcp/kythene	100%	415 ms	48	5
com.flat-hunt/mcp mcp.flat-hunt.com/mcp	100%	456 ms	11	5
dev.rumoro/mcp mcp.rumoro.dev/mcp	100%	779 ms	55	5
com.techsnif/mcp mcp.techsnif.com	100%	46 ms	13	4
com.moltlinestudio/shipping mcp.moltlinestudio.com/shipping	100%	62 ms	6	4
com.moltlinestudio/data mcp.moltlinestudio.com/data	100%	67 ms	7	4
cloud.dchub/mcp-server dchub.cloud/mcp/claude	100%	156 ms	67	4

2026-07-28 spec readiness

Dual-era (2026-07-28 + legacy)27225%
2026-07-28 only50%
Legacy only — not ready82775%

Recently broken

Server	Error
com.a2awire/benchmark-predict-the-news a2awire.com/mcp/benchmarks/predict-the-news/http	timeout
io.github.tjcgraham-rgb/gaip-trust-assurance www.gaipagents.com/mcp/agents/trust-assurance	timeout
com.theresanaiforthat/taaft theresanaiforthat.com/mcp-server/	timeout
io.github.ogasurfproject-jpg/hs-partner-002-mcp p002.horizonshield.dev/mcp	ConnectTimeout
io.github.reefapi/reefapi-mcp api.reefapi.com/mcp	timeout
com.aigramx/aigramx aigramx.com/api/v1/mcp	timeout
io.github.AgentMindCloud/agent-search-pro aggregator-beta.vercel.app/mcp	HTTP 404
to.agentservices/agentservices agentservices.to/mcp	HTTP 503
io.github.gmannerHJ/agent-hub agents.nomoe.ai/mcp	ConnectError
io.github.yyxqqq777/agentpay agentpay-xhs-production.up.railway.app/mcp	HTTP 404

Track record

How often a verdict still held at the very next scheduled check of the same server (usually ~15 minutes later). This measures how stable our verdicts are between checks, not whether real tool calls succeed. History starts Oct 15, 2026, so samples are still small. Raw data

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Get a free API key

1,000 checks/day and 3 change-alert watches. Instant, no email or signup. Agents can also call POST /v1/keys or the get_api_key MCP tool.

For agents: ask before you call

curl -H "X-API-Key: $TW_KEY" \
  "https://toolweather.toolweather.workers.dev/v1/is_safe_to_call?server=com.ufcalendar/fight-api"

{ "verdict": "safe", "status": "ok", "latency_ms": 182,
  "spec_readiness": {"readiness": "dual", "supports_2026_07_28": true},
  "last_tool_change": null, "last_checked": "…" }

# or add the MCP server and call the tool:
is_safe_to_call(server="com.ufcalendar/fight-api", tool="search")

Tool changes

harmless app.agentbit/mcp param schema changed agentbit.browser_render
harmless io.github.MikeyPetrillo/agent402 description changed demand.request
harmless io.github.MikeyPetrillo/agent402 description changed audio.transcribe
harmless io.github.MikeyPetrillo/agent402 param schema changed audio.transcribe
harmless io.github.MikeyPetrillo/agent402 output schema changed market.quote
harmless io.github.MikeyPetrillo/agent402 description changed market.quote
harmless io.github.MikeyPetrillo/agent402 description changed catalog.search
harmless com.swarmmemo/bulletin description changed standing_ways

Embeddable badge

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