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by io.github.Blackwood-State
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Weather forecast

blackwood_weather_forecast
Read-onlyIdempotent

Use when you need a weather forecast, temperature or precipitation for the next hours or days at a place given by coordinates. Do not use for historical weather, severe weather alerts or places given only by name (geocode first). Returns JSON with the hourly weather forecast for a latitude and longitude: temperature, precipitation, wind, humidity, cloud cover and a weather symbol, from MET Norway for 0.003 USDC per call. Typical response time 1500 ms (p95). Category: Data.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
hoursNoHow many hours ahead to return (1-240, 48 when omitted); hourly at first, then every 6 hours
latitudeYesLatitude in decimal degrees (WGS84), e.g. 59.9139 for Oslo, rounded to 4 decimals
longitudeYesLongitude in decimal degrees (WGS84), e.g. 10.7522 for Oslo, rounded to 4 decimals
response_formatNoconcise (the default when omitted) keeps the JSON short: long fields such as base64 images or audio come back as separate image/audio content blocks and other long strings are cut with a marker; detailed returns the full JSON

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "altitudeM": {
-        "type": [
-          "number",
-          "null"
-        ]
-      },
-      "attribution": {
-        "type": "string"
-      },
-      "hours": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "cloudPct": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "humidityPct": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "precipitationHours": {
-              "anyOf": [
-                {
-                  "anyOf": [
-                    {
-                      "const": 1,
-                      "type": "number"
-                    },
-                    {
-                      "const": 6,
-                      "type": "number"
-                    }
-                  ]
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "precipitationMm": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "pressureHpa": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "symbol": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "temperatureC": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "time": {
-              "type": "string"
-            },
-            "windFromDeg": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "windSpeedMs": {
-              "type": [
-                "number",
-                "null"
-              ]
-            }
-          },
-          "required": [
-            "time",
-            "temperatureC",
-            "precipitationMm",
-            "precipitationHours",
-            "windSpeedMs",
-            "windFromDeg",
-            "humidityPct",
-            "cloudPct",
-            "pressureHpa",
-            "symbol"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "latitude": {
-        "type": "number"
-      },
-      "longitude": {
-        "type": "number"
-      },
-      "updatedAt": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "latitude",
-      "longitude",
-      "altitudeM",
-      "updatedAt",
-      "hours",
-      "attribution"
-    ],
-    "type": "object"
-  },
-  {
-    "description": "x402 PaymentRequired (returned with isError when payment is needed)",
-    "properties": {
-      "accepts": {
-        "items": {
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "error": {
-        "type": "string"
-      },
-      "extensions": {
-        "type": "object"
-      },
-      "resource": {
-        "type": "object"
-      },
-      "x402Version": {
-        "type": "integer"
-      }
-    },
-    "required": [
-      "x402Version",
-      "accepts"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "altitudeM": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "attribution": {
+        "type": "string"
+      },
+      "hours": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "cloudPct": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "humidityPct": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "precipitationHours": {
+              "anyOf": [
+                {
+                  "anyOf": [
+                    {
+                      "const": 1,
+                      "type": "number"
+                    },
+                    {
+                      "const": 6,
+                      "type": "number"
+                    }
+                  ]
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "precipitationMm": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "pressureHpa": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "symbol": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "temperatureC": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "time": {
+              "type": "string"
+            },
+            "windFromDeg": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "windSpeedMs": {
+              "type": [
+                "number",
+                "null"
+              ]
+            }
+          },
+          "required": [
+            "time",
+            "temperatureC",
+            "precipitationMm",
+            "precipitationHours",
+            "windSpeedMs",
+            "windFromDeg",
+            "humidityPct",
+            "cloudPct",
+            "pressureHpa",
+            "symbol"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "latitude": {
+        "type": "number"
+      },
+      "longitude": {
+        "type": "number"
+      },
+      "next": {
+        "additionalProperties": false,
+        "description": "Suggested next paid call in the same family (call it in a loop when the task continues)",
+        "properties": {
+          "method": {
+            "enum": [
+              "GET",
+              "POST"
+            ],
+            "type": "string"
+          },
+          "sample": {
+            "description": "Free fixed sample of the whole family",
+            "type": "string"
+          },
+          "service": {
+            "description": "Service id of the suggested next paid call",
+            "type": "string"
+          },
+          "tool": {
+            "description": "MCP tool name of the same call",
+            "type": "string"
+          },
+          "url": {
+            "description": "Paid route of the next call",
+            "type": "string"
+          },
+          "useWhen": {
+            "description": "When the next call is the right one",
+            "type": "string"
+          }
+        },
+        "required": [
+          "service",
+          "tool",
+          "method",
+          "url",
+          "useWhen",
+          "sample"
+        ],
+        "type": "object"
+      },
+      "updatedAt": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "latitude",
+      "longitude",
+      "altitudeM",
+      "updatedAt",
+      "hours",
+      "attribution"
+    ],
+    "type": "object"
+  },
+  {
+    "description": "x402 PaymentRequired (returned with isError when payment is needed)",
+    "properties": {
+      "accepts": {
+        "items": {
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "error": {
+        "type": "string"
+      },
+      "extensions": {
+        "type": "object"
+      },
+      "resource": {
+        "type": "object"
+      },
+      "x402Version": {
+        "type": "integer"
+      }
+    },
+    "required": [
+      "x402Version",
+      "accepts"
+    ],
+    "type": "object"
+  }
+]
  2. Added

TDQS

A4.5/5.0
Behavior4/5

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

Annotations already declare readOnly/idempotent/openWorld/non-destructive, so the safety profile is covered. The description goes further with data provider (MET Norway), per-call price (0.003 USDC) and p95 latency (1500 ms), which an agent cannot infer from annotations and which matter for planning and cost control. It stops short of covering freshness, error behavior or caching.

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?

Front-loads the trigger and exclusions, then the return payload, then operational facts (provider, cost, latency), then category. Every sentence carries information; no filler or restated title.

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?

An output schema exists, so return values need not be spelled out, yet the description still summarizes them. Combined with usage rules, exclusions, pricing and latency, an agent has everything needed to select and invoke this tool correctly.

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 latitude/longitude ranges, WGS84 formatting, the 1-240 hour range, the 48-hour default and the meaning of the concise/detailed enum are all already documented in the schema. The description only alludes to 'next hours or days' and adds no syntax or edge-case guidance beyond it, so the baseline 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 ('weather forecast... for the next hours or days at a place given by coordinates') and enumerates the returned fields (temperature, precipitation, wind, humidity, cloud cover, weather symbol). No sibling covers weather, but the coordinate-based scope still pins the tool down precisely.

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?

Explicit 'Use when' trigger plus explicit exclusions: not for historical weather, not for severe weather alerts, and not for name-only places with a concrete remediation ('geocode first'). This is exactly the when/when-not/alternative pattern.

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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