Uptimeify

check_ssl

Read-only

Fetch and evaluate a host's TLS/SSL certificate over a live handshake: subject and issuer, validity window, days until expiry, hostname match, chain trust, self-signed and expired flags, SANs, serial and SHA-256 fingerprint. Takes a hostname, not an IP address, plus an optional port (default 443). This is a single sample taken now: it does not watch the certificate over time, says nothing about the HTTP response behind it (website_status) and nothing about the transport policy the site advertises (hsts_check). Anonymous and rate-limited per IP; hosts that resolve to private or reserved address space are refused.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`host`	Yes	Domain name (not an IP), e.g. deinkunde.com
`port`	No	TLS port, default 443

Output Schema

TableJSON Schema

Name	Required	Description	Default
`ip`	No
`ok`	No
`san`	No
`host`	No
`port`	No
`found`	No
`expired`	No
`issuerO`	No
`trusted`	No
`validTo`	No
`issuerCN`	No
`subjectCN`	No
`validFrom`	No
`selfSigned`	No
`notYetValid`	No
`serialNumber`	No
`hostnameMatch`	No
`fingerprint256`	No
`daysUntilExpiry`	No
`authorizationError`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed38 schema fields changedSep 11, 2026

removedOutput schema / properties / authorizationError / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / authorizationError / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / daysUntilExpiry / anyOf

Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / daysUntilExpiry / type
```
Added value: +[
+  "number",
+  "null"
+]
```

removedOutput schema / properties / expired / anyOf

Removed value: -[
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / expired / type
```
Added value: +[
+  "boolean",
+  "null"
+]
```

removedOutput schema / properties / fingerprint256 / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / fingerprint256 / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / found / anyOf

Removed value: -[
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / found / type
```
Added value: +[
+  "boolean",
+  "null"
+]
```

removedOutput schema / properties / host / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / host / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / hostnameMatch / anyOf

Removed value: -[
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / hostnameMatch / type
```
Added value: +[
+  "boolean",
+  "null"
+]
```

removedOutput schema / properties / ip / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / ip / type

Added value: +[
+  "string",
+  "null"
+]

removedOutput schema / properties / issuerCN / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / issuerCN / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / issuerO / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / issuerO / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / notYetValid / anyOf

Removed value: -[
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / notYetValid / type
```
Added value: +[
+  "boolean",
+  "null"
+]
```

removedOutput schema / properties / ok / anyOf

Removed value: -[
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / ok / type

Added value: +[
+  "boolean",
+  "null"
+]

removedOutput schema / properties / port / anyOf

Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / port / type
```
Added value: +[
+  "number",
+  "null"
+]
```

removedOutput schema / properties / selfSigned / anyOf

Removed value: -[
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / selfSigned / type
```
Added value: +[
+  "boolean",
+  "null"
+]
```

removedOutput schema / properties / serialNumber / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / serialNumber / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / subjectCN / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / subjectCN / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / trusted / anyOf

Removed value: -[
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / trusted / type
```
Added value: +[
+  "boolean",
+  "null"
+]
```

removedOutput schema / properties / validFrom / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / validFrom / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedOutput schema / properties / validTo / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / validTo / type
```
Added value: +[
+  "string",
+  "null"
+]
```

Changed1 schema field changedAug 4, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "properties": {
+    "authorizationError": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "daysUntilExpiry": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "expired": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "fingerprint256": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "found": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "host": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "hostnameMatch": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "ip": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "issuerCN": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "issuerO": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "notYetValid": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "ok": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "port": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "san": {
+      "anyOf": [
+        {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "selfSigned": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "serialNumber": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "subjectCN": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "trusted": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "validFrom": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "validTo": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "type": "object"
+}

First observedAug 4, 2026

TDQS

A4.6/5.0

Behavior5/5

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

Beyond the readOnlyHint annotation, the description discloses rate limiting per IP, anonymity, refusal of private/reserved address space, and that the result is a single point-in-time sample with no historical tracking. These are operational behaviors an agent needs and none are inferable from the annotation or schema.

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

Conciseness4/5

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

Front-loaded with the core purpose and scope limits, and every clause is informative. The long enumeration of returned fields is somewhat redundant given an output schema exists, which is the only reason it falls short of 5.

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?

Covers input form, defaults, scope boundaries versus siblings, sampling semantics, access constraints, and network restrictions — everything needed to call the tool correctly and interpret its limits, with the output schema covering return values.

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%, so both parameters are already documented, and the description largely repeats the schema's constraint that a hostname (not an IP) is required and that the port defaults to 443. No additional syntax, validation, or edge-case detail is added, so the baseline of 3 applies.

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?

States a specific verb and resource ('fetch and evaluate a host's TLS/SSL certificate over a live handshake') and enumerates what is evaluated: subject/issuer, validity window, expiry, hostname match, chain trust, self-signed/expired flags, SANs, serial, fingerprint. It explicitly distinguishes itself from the sibling tools website_status and hsts_check by naming what it does not cover.

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

Usage Guidelines5/5

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

Gives explicit routing conditions: it is a point-in-time sample, not continuous monitoring, and it says nothing about the HTTP response (website_status) or transport policy (hsts_check). It also states the input precondition (hostname, not IP) and the access constraint (anonymous, rate-limited per IP, private/reserved addresses refused).

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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