Uptimeify

redirect_check

Read-only

Follow a URL's HTTP redirect chain hop by hop and return every step with its status code, source and target, the final URL and status, the hop count, and warnings for chains that loop, drop from HTTPS to HTTP, or run longer than they should. Answers where a URL ends up and how many round trips that costs; it returns neither the body nor the headers of the destination (http_headers). Anonymous and rate-limited per IP; private and reserved address space is refused.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`url`	Yes	Full URL, e.g. https://deinkunde.com

Output Schema

TableJSON Schema

Name	Required	Description	Default
`ok`	No
`hops`	No
`start`	No
`finalUrl`	No
`warnings`	No
`totalHops`	No
`finalStatus`	No
`finalStatusText`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed13 schema fields changedSep 11, 2026

removedOutput schema / properties / finalStatus / anyOf

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

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

removedOutput schema / properties / finalStatusText / anyOf

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

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

removedOutput schema / properties / finalUrl / anyOf

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

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

changedOutput schema / properties / hops / anyOf

Previous value: -[
-  {
-    "items": {
-      "additionalProperties": {},
-      "properties": {
-        "from": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "status": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "to": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        }
-      },
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "additionalProperties": {},
+      "properties": {
+        "from": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "status": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "to": {
+          "type": [
+            "string",
+            "null"
+          ]
+        }
+      },
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]

removedOutput schema / properties / ok / anyOf

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

addedOutput schema / properties / ok / type

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

removedOutput schema / properties / start / anyOf

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

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

removedOutput schema / properties / totalHops / anyOf

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

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

Changed1 schema field changedAug 4, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "properties": {
+    "finalStatus": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "finalStatusText": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "finalUrl": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "hops": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": {},
+            "properties": {
+              "from": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "status": {
+                "anyOf": [
+                  {
+                    "type": "number"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "to": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "ok": {
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "start": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "totalHops": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "warnings": {
+      "anyOf": [
+        {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "type": "object"
+}

First observedAug 4, 2026

TDQS

A4.4/5.0

Behavior5/5

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

Annotations only carry readOnlyHint, but the description adds substantial behavioral context: anonymous access, per-IP rate limiting, refusal of private/reserved address space, and warnings emitted for loops, HTTPS-to-HTTP downgrades, and over-long chains. It also discloses what is not returned (destination body/headers), which no annotation conveys.

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 action and return contents, then the exclusions and constraints. The opening sentence is dense with a long list of returned fields, but every clause conveys distinct, useful information rather than repeating structured data.

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 tool with an output schema, the description covers the remaining gaps an agent needs: access model (anonymous, rate-limited), safety constraints (private/reserved space refused), diagnostic warnings, and explicit boundaries versus http_headers. Nothing material is missing.

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 coverage is 100% with a single 'url' parameter already documented with an example, so the schema carries the load. The description adds no format or syntax detail beyond what the schema provides, making the baseline 3 appropriate.

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 ('Follow a URL's HTTP redirect chain hop by hop') and enumerates exactly what it returns, so an agent knows this is a redirect-tracing tool distinct from one-shot checks. It explicitly contrasts itself with the http_headers sibling, stating it returns neither body nor headers of the destination.

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?

It clearly frames the question the tool answers ('where a URL ends up and how many round trips that costs') and routes header/body needs to http_headers, which is the natural alternative. However it does not explicitly state when redirect_check should be preferred over, say, website_status, leaving some sibling selection to inference.

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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