Is This Site Down?

Check whether a website is down

check_site

Read-onlyIdempotent

Live up/down check of any public website from an independent server (Singapore; Boston for sites that geo-block Singapore). Returns a one-sentence verdict plus status code, latency, resolved IP, redirect target, the view from the other region when available, and how many users reported problems in the last hour. Results are cached 30 s per domain.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`domain`	Yes	Domain or URL to check, e.g. "github.com" or "https://www.reddit.com/r/all". Scheme, path, port and query are ignored; the host is checked as given.

Output Schema

TableJSON Schema

Name	Required	Description
`ip`	No
`up`	Yes
`tls`	No
`url`	Yes
`state`	Yes
`domain`	Yes
`reason`	Yes
`scheme`	No
`server`	No
`status`	Yes
`curated`	Yes	true if the site is one of the monitored sites
`regions`	Yes	Fresh result from each region that has one
`finalUrl`	No
`checkedAt`	Yes	ISO 8601
`latencyMs`	Yes
`statusUrl`	Yes
`redirected`	No
`checkedFrom`	Yes	sg = Singapore, us = Boston
`reportsLastHour`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 16, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "checkedAt": {
+      "description": "ISO 8601",
+      "type": "string"
+    },
+    "checkedFrom": {
+      "description": "sg = Singapore, us = Boston",
+      "enum": [
+        "sg",
+        "us"
+      ],
+      "type": "string"
+    },
+    "curated": {
+      "description": "true if the site is one of the monitored sites",
+      "type": "boolean"
+    },
+    "domain": {
+      "type": "string"
+    },
+    "finalUrl": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "ip": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "latencyMs": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "reason": {
+      "type": "string"
+    },
+    "redirected": {
+      "type": "boolean"
+    },
+    "regions": {
+      "description": "Fresh result from each region that has one",
+      "properties": {
+        "sg": {
+          "properties": {
+            "checkedAt": {
+              "description": "ISO 8601",
+              "type": "string"
+            },
+            "domain": {
+              "type": "string"
+            },
+            "finalUrl": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "ip": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "latencyMs": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "reason": {
+              "type": "string"
+            },
+            "redirected": {
+              "type": "boolean"
+            },
+            "scheme": {
+              "enum": [
+                "https",
+                "http",
+                null
+              ],
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "server": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "state": {
+              "enum": [
+                "up",
+                "slow",
+                "error",
+                "maintenance",
+                "down"
+              ],
+              "type": "string"
+            },
+            "status": {
+              "type": [
+                "integer",
+                "null"
+              ]
+            },
+            "tls": {
+              "properties": {
+                "daysRemaining": {
+                  "type": "number"
+                },
+                "issuer": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "validTo": {
+                  "type": "string"
+                }
+              },
+              "type": [
+                "object",
+                "null"
+              ]
+            },
+            "up": {
+              "type": "boolean"
+            }
+          },
+          "required": [
+            "domain",
+            "up",
+            "state",
+            "status",
+            "latencyMs",
+            "checkedAt",
+            "reason"
+          ],
+          "type": "object"
+        },
+        "us": {
+          "properties": {
+            "checkedAt": {
+              "description": "ISO 8601",
+              "type": "string"
+            },
+            "domain": {
+              "type": "string"
+            },
+            "finalUrl": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "ip": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "latencyMs": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "reason": {
+              "type": "string"
+            },
+            "redirected": {
+              "type": "boolean"
+            },
+            "scheme": {
+              "enum": [
+                "https",
+                "http",
+                null
+              ],
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "server": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "state": {
+              "enum": [
+                "up",
+                "slow",
+                "error",
+                "maintenance",
+                "down"
+              ],
+              "type": "string"
+            },
+            "status": {
+              "type": [
+                "integer",
+                "null"
+              ]
+            },
+            "tls": {
+              "properties": {
+                "daysRemaining": {
+                  "type": "number"
+                },
+                "issuer": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "validTo": {
+                  "type": "string"
+                }
+              },
+              "type": [
+                "object",
+                "null"
+              ]
+            },
+            "up": {
+              "type": "boolean"
+            }
+          },
+          "required": [
+            "domain",
+            "up",
+            "state",
+            "status",
+            "latencyMs",
+            "checkedAt",
+            "reason"
+          ],
+          "type": "object"
+        }
+      },
+      "type": "object"
+    },
+    "reportsLastHour": {
+      "type": "integer"
+    },
+    "scheme": {
+      "enum": [
+        "https",
+        "http",
+        null
+      ],
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "server": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "state": {
+      "enum": [
+        "up",
+        "slow",
+        "error",
+        "maintenance",
+        "down"
+      ],
+      "type": "string"
+    },
+    "status": {
+      "type": [
+        "integer",
+        "null"
+      ]
+    },
+    "statusUrl": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "tls": {
+      "properties": {
+        "daysRemaining": {
+          "type": "number"
+        },
+        "issuer": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "validTo": {
+          "type": "string"
+        }
+      },
+      "type": [
+        "object",
+        "null"
+      ]
+    },
+    "up": {
+      "type": "boolean"
+    },
+    "url": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "domain",
+    "up",
+    "state",
+    "status",
+    "latencyMs",
+    "checkedAt",
+    "reason",
+    "checkedFrom",
+    "regions",
+    "reportsLastHour",
+    "curated",
+    "statusUrl",
+    "url"
+  ],
+  "type": "object"
+}

First observedSep 12, 2026

TDQS

A4.5/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Beyond the readOnly/openWorld/idempotent annotations, the description discloses non-obvious behavior: server locations, geo-block fallback, caching for 30 seconds, and the exact set of returned fields. It also clarifies scope by noting the check is live and independent.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences with no filler. The opening phrase states the core purpose, and the second sentence efficiently packs return values, regional behavior, user-report data, and caching into a digestible list.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a single-parameter, read-only tool with an output schema, the description covers operational context: server location, geo-block handling, caching, and returned verdict. Nothing important is missing for an agent to call this tool appropriately.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and the domain parameter is already well documented, including ignored parts such as scheme, path, port, and query. The tool description does not need to add much parameter detail; its 'any public website' phrasing adds only minor reinforcement.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb and resource: 'Live up/down check of any public website'. It clearly distinguishes itself from sibling tools like check_certificate, site_history, and list_outages by focusing on immediate availability from an independent server.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description makes the usage context clear: use this for an immediate, live availability check of any public website, with independent-server visibility and a 30-second cache. It does not explicitly name alternatives or exclusion cases, so it stops short of a 5.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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