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TinyFn

by io.tinyfn
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week_number

Get the ISO week number of a date.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
dateYesDate (YYYY-MM-DD)

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
codeNo
dateNo
errorNo
day_nameNo
iso_yearNo
day_of_weekNo
week_numberNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed3 schema fields changed
    • removedOutput schema / $defs / WeekNumberResponse
      Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "date": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Date"
-    },
-    "day_name": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Name"
-    },
-    "day_of_week": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Of Week"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "iso_year": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Iso Year"
-    },
-    "week_number": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Week Number"
-    }
-  },
-  "title": "WeekNumberResponse",
-  "type": "object"
-}
    • addedOutput schema / $defs / app__routers__datetime_utils__WeekNumberResponse
      Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "date": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Date"
+    },
+    "day_name": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Name"
+    },
+    "day_of_week": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Of Week"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "iso_year": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Iso Year"
+    },
+    "week_number": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Week Number"
+    }
+  },
+  "title": "WeekNumberResponse",
+  "type": "object"
+}
    • changedOutput schema / x-fastmcp-top-level-schema
      Previous value: -"WeekNumberResponse"New value: +"app__routers__datetime_utils__WeekNumberResponse"
  2. Changed3 schema fields changed
    • addedOutput schema / $defs / WeekNumberResponse
      Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "date": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Date"
+    },
+    "day_name": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Name"
+    },
+    "day_of_week": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Of Week"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "iso_year": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Iso Year"
+    },
+    "week_number": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Week Number"
+    }
+  },
+  "title": "WeekNumberResponse",
+  "type": "object"
+}
    • removedOutput schema / $defs / app__routers__datetime_utils__WeekNumberResponse
      Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "date": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Date"
-    },
-    "day_name": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Name"
-    },
-    "day_of_week": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Of Week"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "iso_year": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Iso Year"
-    },
-    "week_number": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Week Number"
-    }
-  },
-  "title": "WeekNumberResponse",
-  "type": "object"
-}
    • changedOutput schema / x-fastmcp-top-level-schema
      Previous value: -"app__routers__datetime_utils__WeekNumberResponse"New value: +"WeekNumberResponse"
  3. Changed3 schema fields changed
    • removedOutput schema / $defs / WeekNumberResponse
      Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "date": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Date"
-    },
-    "day_name": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Name"
-    },
-    "day_of_week": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Of Week"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "iso_year": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Iso Year"
-    },
-    "week_number": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Week Number"
-    }
-  },
-  "title": "WeekNumberResponse",
-  "type": "object"
-}
    • addedOutput schema / $defs / app__routers__datetime_utils__WeekNumberResponse
      Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "date": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Date"
+    },
+    "day_name": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Name"
+    },
+    "day_of_week": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Of Week"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "iso_year": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Iso Year"
+    },
+    "week_number": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Week Number"
+    }
+  },
+  "title": "WeekNumberResponse",
+  "type": "object"
+}
    • changedOutput schema / x-fastmcp-top-level-schema
      Previous value: -"WeekNumberResponse"New value: +"app__routers__datetime_utils__WeekNumberResponse"
  4. Changed3 schema fields changed
    • addedOutput schema / $defs / WeekNumberResponse
      Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "date": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Date"
+    },
+    "day_name": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Name"
+    },
+    "day_of_week": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Of Week"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "iso_year": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Iso Year"
+    },
+    "week_number": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Week Number"
+    }
+  },
+  "title": "WeekNumberResponse",
+  "type": "object"
+}
    • removedOutput schema / $defs / app__routers__datetime_utils__WeekNumberResponse
      Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "date": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Date"
-    },
-    "day_name": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Name"
-    },
-    "day_of_week": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Of Week"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "iso_year": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Iso Year"
-    },
-    "week_number": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Week Number"
-    }
-  },
-  "title": "WeekNumberResponse",
-  "type": "object"
-}
    • changedOutput schema / x-fastmcp-top-level-schema
      Previous value: -"app__routers__datetime_utils__WeekNumberResponse"New value: +"WeekNumberResponse"
  5. Changed3 schema fields changed
    • removedOutput schema / $defs / WeekNumberResponse
      Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "date": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Date"
-    },
-    "day_name": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Name"
-    },
-    "day_of_week": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Of Week"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "iso_year": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Iso Year"
-    },
-    "week_number": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Week Number"
-    }
-  },
-  "title": "WeekNumberResponse",
-  "type": "object"
-}
    • addedOutput schema / $defs / app__routers__datetime_utils__WeekNumberResponse
      Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "date": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Date"
+    },
+    "day_name": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Name"
+    },
+    "day_of_week": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Of Week"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "iso_year": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Iso Year"
+    },
+    "week_number": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Week Number"
+    }
+  },
+  "title": "WeekNumberResponse",
+  "type": "object"
+}
    • changedOutput schema / x-fastmcp-top-level-schema
      Previous value: -"WeekNumberResponse"New value: +"app__routers__datetime_utils__WeekNumberResponse"
  6. Changed3 schema fields changed
    • addedOutput schema / $defs / WeekNumberResponse
      Added value: +{
+  "properties": {
+    "code": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Code"
+    },
+    "date": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Date"
+    },
+    "day_name": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Name"
+    },
+    "day_of_week": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Day Of Week"
+    },
+    "error": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Error"
+    },
+    "iso_year": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Iso Year"
+    },
+    "week_number": {
+      "anyOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "title": "Week Number"
+    }
+  },
+  "title": "WeekNumberResponse",
+  "type": "object"
+}
    • removedOutput schema / $defs / app__routers__datetime_utils__WeekNumberResponse
      Removed value: -{
-  "properties": {
-    "code": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Code"
-    },
-    "date": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Date"
-    },
-    "day_name": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Name"
-    },
-    "day_of_week": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Day Of Week"
-    },
-    "error": {
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Error"
-    },
-    "iso_year": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Iso Year"
-    },
-    "week_number": {
-      "anyOf": [
-        {
-          "type": "integer"
-        },
-        {
-          "type": "null"
-        }
-      ],
-      "title": "Week Number"
-    }
-  },
-  "title": "WeekNumberResponse",
-  "type": "object"
-}
    • changedOutput schema / x-fastmcp-top-level-schema
      Previous value: -"app__routers__datetime_utils__WeekNumberResponse"New value: +"WeekNumberResponse"
  7. First observed

TDQS

B3.4/5.0
Behavior3/5

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

No annotations exist, so the description carries the behavioral burden. It indicates a read-only, deterministic computation and pins down the ISO standard, but it does not mention edge behavior such as invalid dates or the 1–53 output range.

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?

The description is one short sentence that front-loads the operation. Every word earns its place and there is no filler or restating of the input schema.

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

Completeness4/5

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

For a single-argument, pure date conversion with a fully documented input schema and an output schema, the description is nearly sufficient. The only missing context is sibling differentiation, which is already reflected in the purpose and usage scores.

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?

The schema already documents the single date parameter completely, including its YYYY-MM-DD format. The phrase 'of a date' adds no semantic value beyond the schema, so the baseline of 3 applies.

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

Purpose4/5

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

The description names a specific operation and resource: getting the ISO week number of a date. It is clear and the ISO qualifier narrows the semantics, but it does not explicitly separate this tool from the direct sibling week_number_2.

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

Usage Guidelines2/5

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

There is no guidance on when to use this tool instead of week_number_2 or any other date utility. The only implied use is 'when an ISO week number is needed', with no alternatives or exclusions stated.

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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