ClimbCast

Forecast accuracy

get_forecast_accuracy

Read-onlyIdempotent

Returns stored public regional forecast accuracy, including observed-station or model-proxy truth lineage, data sufficiency, and eligibility. Takes either a region_id or an objective slug, which resolves to the accuracy region of the NWAC zone the objective is bound to. Informational only.

Input Schema

Name	Required	Description	Default
`slug`	No	Public objective slug returned by search_objectives. It resolves to the accuracy region of the NWAC zone the objective is bound to. Provide exactly one of slug and region_id.
`region_id`	No	Public accuracy region identifier, for example pnw-olympics. Provide exactly one of region_id and slug.

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 26, 2026

changedOutput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "computedAt": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "eligible": {
-        "const": true
-      },
-      "precipOccurrence": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "accuracyPct": {
-                "type": "number"
-              },
-              "n": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "accuracyPct",
-              "n"
-            ],
-            "type": "object"
-          },
-          {
-            "const": "insufficient"
-          }
-        ]
-      },
-      "provenance": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "replaySource": {
-                "const": "open-meteo-archive"
-              },
-              "truth": {
-                "const": "ifs-9km"
-              }
-            },
-            "required": [
-              "truth",
-              "replaySource"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "replaySource": {
-                "const": "open-meteo-archive"
-              },
-              "station": {
-                "additionalProperties": false,
-                "properties": {
-                  "distanceMi": {
-                    "type": "number"
-                  },
-                  "elevDeltaFt": {
-                    "type": "number"
-                  },
-                  "network": {
-                    "enum": [
-                      "snotel",
-                      "bc-asws",
-                      "synoptic"
-                    ]
-                  },
-                  "stationId": {
-                    "type": "string"
-                  },
-                  "stationName": {
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "stationId",
-                  "network",
-                  "stationName",
-                  "distanceMi",
-                  "elevDeltaFt"
-                ],
-                "type": "object"
-              },
-              "truth": {
-                "const": "station-obs"
-              }
-            },
-            "required": [
-              "truth",
-              "replaySource",
-              "station"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "regionId": {
-        "type": "string"
-      },
-      "temperature": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "biasF": {
-                "type": "number"
-              },
-              "maeF": {
-                "type": "number"
-              },
-              "n": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "maeF",
-              "biasF",
-              "n"
-            ],
-            "type": "object"
-          },
-          {
-            "const": "insufficient"
-          }
-        ]
-      },
-      "windowDays": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "regionId",
-      "windowDays",
-      "provenance",
-      "computedAt",
-      "disclaimerText",
-      "eligible",
-      "temperature",
-      "precipOccurrence"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "computedAt": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "eligible": {
-        "const": false
-      },
-      "provenance": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "replaySource": {
-                "const": "open-meteo-archive"
-              },
-              "truth": {
-                "const": "ifs-9km"
-              }
-            },
-            "required": [
-              "truth",
-              "replaySource"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "replaySource": {
-                "const": "open-meteo-archive"
-              },
-              "station": {
-                "additionalProperties": false,
-                "properties": {
-                  "distanceMi": {
-                    "type": "number"
-                  },
-                  "elevDeltaFt": {
-                    "type": "number"
-                  },
-                  "network": {
-                    "enum": [
-                      "snotel",
-                      "bc-asws",
-                      "synoptic"
-                    ]
-                  },
-                  "stationId": {
-                    "type": "string"
-                  },
-                  "stationName": {
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "stationId",
-                  "network",
-                  "stationName",
-                  "distanceMi",
-                  "elevDeltaFt"
-                ],
-                "type": "object"
-              },
-              "truth": {
-                "const": "station-obs"
-              }
-            },
-            "required": [
-              "truth",
-              "replaySource",
-              "station"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "reason": {
-        "enum": [
-          "no-station-truth",
-          "insufficient-samples",
-          "elevation-gap-exceeded",
-          "stale-station-truth"
-        ]
-      },
-      "regionId": {
-        "type": "string"
-      },
-      "windowDays": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "regionId",
-      "windowDays",
-      "provenance",
-      "computedAt",
-      "disclaimerText",
-      "eligible",
-      "reason"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "message": {
-        "type": "string"
-      },
-      "status": {
-        "const": "not_found"
-      },
-      "suggestions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "name": {
-              "type": "string"
-            },
-            "slug": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "slug",
-            "name"
-          ],
-          "type": "object"
-        },
-        "maxItems": 3,
-        "type": "array"
-      },
-      "try": {
-        "const": "search_objectives"
-      }
-    },
-    "required": [
-      "status",
-      "message",
-      "try",
-      "suggestions",
-      "disclaimerText"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "knownRegionIds": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "message": {
-        "type": "string"
-      },
-      "status": {
-        "const": "not_found"
-      },
-      "suggestions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "name": {
-              "type": "string"
-            },
-            "slug": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "slug",
-            "name"
-          ],
-          "type": "object"
-        },
-        "maxItems": 3,
-        "type": "array"
-      },
-      "try": {
-        "const": "search_objectives"
-      }
-    },
-    "required": [
-      "status",
-      "message",
-      "try",
-      "suggestions",
-      "disclaimerText",
-      "knownRegionIds"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "error": {
-        "const": "invalid_input"
-      },
-      "fields": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
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-                "type": "string"
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-            "field": {
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-            "problem": {
-              "enum": [
-                "required",
-                "type",
-                "enum",
-                "length",
-                "pattern",
-                "range",
-                "format",
-                "not_in_window",
-                "unexpected"
-              ]
-            }
-          },
-          "required": [
-            "field",
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-          "type": "object"
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-      "fields"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "error": {
-        "enum": [
-          "MCP_BUSY",
-          "MCP_RESPONSE_TOO_LARGE",
-          "MCP_VOICE_GATE_FAILED",
-          "MCP_TOOL_FAILED",
-          "MCP_OUTPUT_INVALID",
-          "rate_limited",
-          "processing_limit",
-          "response_limit"
-        ]
-      },
-      "message": {
-        "type": "string"
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-      "requestId": {
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-    "required": [
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-      "requestId",
-      "disclaimerText"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "computedAt": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "eligible": {
+        "const": true
+      },
+      "precipOccurrence": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "accuracyPct": {
+                "type": "number"
+              },
+              "n": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "accuracyPct",
+              "n"
+            ],
+            "type": "object"
+          },
+          {
+            "const": "insufficient"
+          }
+        ]
+      },
+      "provenance": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "truth": {
+                "const": "ifs-9km"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "station": {
+                "additionalProperties": false,
+                "properties": {
+                  "distanceMi": {
+                    "description": "Distance from the region centroid to the station in miles, rounded to 0.1.",
+                    "type": "number"
+                  },
+                  "elevDeltaFt": {
+                    "description": "Station elevation minus the region representative elevation in feet, positive when the station sits above.",
+                    "type": "number"
+                  },
+                  "network": {
+                    "enum": [
+                      "snotel",
+                      "bc-asws",
+                      "synoptic"
+                    ]
+                  },
+                  "stationId": {
+                    "type": "string"
+                  },
+                  "stationName": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "stationId",
+                  "network",
+                  "stationName",
+                  "distanceMi",
+                  "elevDeltaFt"
+                ],
+                "type": "object"
+              },
+              "truth": {
+                "const": "station-obs"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource",
+              "station"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "regionId": {
+        "type": "string"
+      },
+      "temperature": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "biasF": {
+                "type": "number"
+              },
+              "maeF": {
+                "type": "number"
+              },
+              "n": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "maeF",
+              "biasF",
+              "n"
+            ],
+            "type": "object"
+          },
+          {
+            "const": "insufficient"
+          }
+        ]
+      },
+      "windowDays": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "regionId",
+      "windowDays",
+      "provenance",
+      "computedAt",
+      "disclaimerText",
+      "eligible",
+      "temperature",
+      "precipOccurrence"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "computedAt": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "eligible": {
+        "const": false
+      },
+      "provenance": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "truth": {
+                "const": "ifs-9km"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "station": {
+                "additionalProperties": false,
+                "properties": {
+                  "distanceMi": {
+                    "description": "Distance from the region centroid to the station in miles, rounded to 0.1.",
+                    "type": "number"
+                  },
+                  "elevDeltaFt": {
+                    "description": "Station elevation minus the region representative elevation in feet, positive when the station sits above.",
+                    "type": "number"
+                  },
+                  "network": {
+                    "enum": [
+                      "snotel",
+                      "bc-asws",
+                      "synoptic"
+                    ]
+                  },
+                  "stationId": {
+                    "type": "string"
+                  },
+                  "stationName": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "stationId",
+                  "network",
+                  "stationName",
+                  "distanceMi",
+                  "elevDeltaFt"
+                ],
+                "type": "object"
+              },
+              "truth": {
+                "const": "station-obs"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource",
+              "station"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "reason": {
+        "enum": [
+          "no-station-truth",
+          "insufficient-samples",
+          "elevation-gap-exceeded",
+          "stale-station-truth"
+        ]
+      },
+      "regionId": {
+        "type": "string"
+      },
+      "windowDays": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "regionId",
+      "windowDays",
+      "provenance",
+      "computedAt",
+      "disclaimerText",
+      "eligible",
+      "reason"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "message": {
+        "type": "string"
+      },
+      "status": {
+        "const": "not_found"
+      },
+      "suggestions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "name": {
+              "type": "string"
+            },
+            "slug": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "slug",
+            "name"
+          ],
+          "type": "object"
+        },
+        "maxItems": 3,
+        "type": "array"
+      },
+      "try": {
+        "const": "search_objectives"
+      }
+    },
+    "required": [
+      "status",
+      "message",
+      "try",
+      "suggestions",
+      "disclaimerText"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "knownRegionIds": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "message": {
+        "type": "string"
+      },
+      "status": {
+        "const": "not_found"
+      },
+      "suggestions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "name": {
+              "type": "string"
+            },
+            "slug": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "slug",
+            "name"
+          ],
+          "type": "object"
+        },
+        "maxItems": 3,
+        "type": "array"
+      },
+      "try": {
+        "const": "search_objectives"
+      }
+    },
+    "required": [
+      "status",
+      "message",
+      "try",
+      "suggestions",
+      "disclaimerText",
+      "knownRegionIds"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "error": {
+        "const": "invalid_input"
+      },
+      "fields": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "allowed": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "field": {
+              "type": "string"
+            },
+            "problem": {
+              "enum": [
+                "required",
+                "type",
+                "enum",
+                "length",
+                "pattern",
+                "range",
+                "format",
+                "not_in_window",
+                "unexpected"
+              ]
+            }
+          },
+          "required": [
+            "field",
+            "problem"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "message": {
+        "type": "string"
+      },
+      "requestId": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "error",
+      "message",
+      "requestId",
+      "disclaimerText",
+      "fields"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "error": {
+        "enum": [
+          "MCP_BUSY",
+          "MCP_RESPONSE_TOO_LARGE",
+          "MCP_VOICE_GATE_FAILED",
+          "MCP_TOOL_FAILED",
+          "MCP_OUTPUT_INVALID",
+          "rate_limited",
+          "processing_limit",
+          "response_limit"
+        ]
+      },
+      "message": {
+        "type": "string"
+      },
+      "requestId": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "error",
+      "message",
+      "requestId",
+      "disclaimerText"
+    ],
+    "type": "object"
+  }
+]

Changed1 schema field changedOct 14, 2026

changedOutput schema / oneOf

Previous value: -[
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-    "additionalProperties": false,
-    "properties": {
-      "computedAt": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "eligible": {
-        "const": true
-      },
-      "precipOccurrence": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "accuracyPct": {
-                "type": "number"
-              },
-              "n": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "accuracyPct",
-              "n"
-            ],
-            "type": "object"
-          },
-          {
-            "const": "insufficient"
-          }
-        ]
-      },
-      "provenance": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "replaySource": {
-                "const": "open-meteo-archive"
-              },
-              "truth": {
-                "const": "ifs-9km"
-              }
-            },
-            "required": [
-              "truth",
-              "replaySource"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "replaySource": {
-                "const": "open-meteo-archive"
-              },
-              "station": {
-                "additionalProperties": false,
-                "properties": {
-                  "distanceMi": {
-                    "type": "number"
-                  },
-                  "elevDeltaFt": {
-                    "type": "number"
-                  },
-                  "network": {
-                    "enum": [
-                      "snotel",
-                      "bc-asws",
-                      "synoptic"
-                    ]
-                  },
-                  "stationId": {
-                    "type": "string"
-                  },
-                  "stationName": {
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "stationId",
-                  "network",
-                  "stationName",
-                  "distanceMi",
-                  "elevDeltaFt"
-                ],
-                "type": "object"
-              },
-              "truth": {
-                "const": "station-obs"
-              }
-            },
-            "required": [
-              "truth",
-              "replaySource",
-              "station"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "regionId": {
-        "type": "string"
-      },
-      "temperature": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
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-                "type": "number"
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-              "maeF": {
-                "type": "number"
-              },
-              "n": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "maeF",
-              "biasF",
-              "n"
-            ],
-            "type": "object"
-          },
-          {
-            "const": "insufficient"
-          }
-        ]
-      },
-      "windowDays": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "regionId",
-      "windowDays",
-      "provenance",
-      "computedAt",
-      "disclaimerText",
-      "eligible",
-      "temperature",
-      "precipOccurrence"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "computedAt": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "eligible": {
-        "const": false
-      },
-      "provenance": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "replaySource": {
-                "const": "open-meteo-archive"
-              },
-              "truth": {
-                "const": "ifs-9km"
-              }
-            },
-            "required": [
-              "truth",
-              "replaySource"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "replaySource": {
-                "const": "open-meteo-archive"
-              },
-              "station": {
-                "additionalProperties": false,
-                "properties": {
-                  "distanceMi": {
-                    "type": "number"
-                  },
-                  "elevDeltaFt": {
-                    "type": "number"
-                  },
-                  "network": {
-                    "enum": [
-                      "snotel",
-                      "bc-asws",
-                      "synoptic"
-                    ]
-                  },
-                  "stationId": {
-                    "type": "string"
-                  },
-                  "stationName": {
-                    "type": "string"
-                  }
-                },
-                "required": [
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-                  "network",
-                  "stationName",
-                  "distanceMi",
-                  "elevDeltaFt"
-                ],
-                "type": "object"
-              },
-              "truth": {
-                "const": "station-obs"
-              }
-            },
-            "required": [
-              "truth",
-              "replaySource",
-              "station"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "reason": {
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-          "no-station-truth",
-          "insufficient-samples",
-          "elevation-gap-exceeded",
-          "stale-station-truth"
-        ]
-      },
-      "regionId": {
-        "type": "string"
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-      "windowDays": {
-        "type": "number"
-      }
-    },
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-      "windowDays",
-      "provenance",
-      "computedAt",
-      "disclaimerText",
-      "eligible",
-      "reason"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "message": {
-        "type": "string"
-      },
-      "status": {
-        "const": "not_found"
-      },
-      "suggestions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "name": {
-              "type": "string"
-            },
-            "slug": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "slug",
-            "name"
-          ],
-          "type": "object"
-        },
-        "maxItems": 3,
-        "type": "array"
-      },
-      "try": {
-        "const": "search_objectives"
-      }
-    },
-    "required": [
-      "status",
-      "message",
-      "try",
-      "suggestions",
-      "disclaimerText"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "knownRegionIds": {
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-          "type": "string"
-        },
-        "type": "array"
-      },
-      "message": {
-        "type": "string"
-      },
-      "status": {
-        "const": "not_found"
-      },
-      "suggestions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "name": {
-              "type": "string"
-            },
-            "slug": {
-              "type": "string"
-            }
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-          "required": [
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-            "name"
-          ],
-          "type": "object"
-        },
-        "maxItems": 3,
-        "type": "array"
-      },
-      "try": {
-        "const": "search_objectives"
-      }
-    },
-    "required": [
-      "status",
-      "message",
-      "try",
-      "suggestions",
-      "disclaimerText",
-      "knownRegionIds"
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-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "error": {
-        "const": "invalid_input"
-      },
-      "fields": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "allowed": {
-              "items": {
-                "type": "string"
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-              "type": "array"
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-                "pattern",
-                "range",
-                "format",
-                "not_in_window",
-                "unexpected"
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-            }
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-          "required": [
-            "field",
-            "problem"
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-          "type": "object"
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-        "type": "array"
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-      "message": {
-        "type": "string"
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-      "requestId": {
-        "type": [
-          "string",
-          "null"
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-    },
-    "required": [
-      "error",
-      "message",
-      "requestId",
-      "disclaimerText",
-      "fields"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "error": {
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-          "MCP_RESPONSE_TOO_LARGE",
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-          "MCP_TOOL_FAILED",
-          "rate_limited",
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-          "response_limit"
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-      "message": {
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-          "null"
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-    "required": [
-      "error",
-      "message",
-      "requestId",
-      "disclaimerText"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "computedAt": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "eligible": {
+        "const": true
+      },
+      "precipOccurrence": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "accuracyPct": {
+                "type": "number"
+              },
+              "n": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "accuracyPct",
+              "n"
+            ],
+            "type": "object"
+          },
+          {
+            "const": "insufficient"
+          }
+        ]
+      },
+      "provenance": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "truth": {
+                "const": "ifs-9km"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "station": {
+                "additionalProperties": false,
+                "properties": {
+                  "distanceMi": {
+                    "type": "number"
+                  },
+                  "elevDeltaFt": {
+                    "type": "number"
+                  },
+                  "network": {
+                    "enum": [
+                      "snotel",
+                      "bc-asws",
+                      "synoptic"
+                    ]
+                  },
+                  "stationId": {
+                    "type": "string"
+                  },
+                  "stationName": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "stationId",
+                  "network",
+                  "stationName",
+                  "distanceMi",
+                  "elevDeltaFt"
+                ],
+                "type": "object"
+              },
+              "truth": {
+                "const": "station-obs"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource",
+              "station"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "regionId": {
+        "type": "string"
+      },
+      "temperature": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "biasF": {
+                "type": "number"
+              },
+              "maeF": {
+                "type": "number"
+              },
+              "n": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "maeF",
+              "biasF",
+              "n"
+            ],
+            "type": "object"
+          },
+          {
+            "const": "insufficient"
+          }
+        ]
+      },
+      "windowDays": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "regionId",
+      "windowDays",
+      "provenance",
+      "computedAt",
+      "disclaimerText",
+      "eligible",
+      "temperature",
+      "precipOccurrence"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "computedAt": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "eligible": {
+        "const": false
+      },
+      "provenance": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "truth": {
+                "const": "ifs-9km"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "station": {
+                "additionalProperties": false,
+                "properties": {
+                  "distanceMi": {
+                    "type": "number"
+                  },
+                  "elevDeltaFt": {
+                    "type": "number"
+                  },
+                  "network": {
+                    "enum": [
+                      "snotel",
+                      "bc-asws",
+                      "synoptic"
+                    ]
+                  },
+                  "stationId": {
+                    "type": "string"
+                  },
+                  "stationName": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "stationId",
+                  "network",
+                  "stationName",
+                  "distanceMi",
+                  "elevDeltaFt"
+                ],
+                "type": "object"
+              },
+              "truth": {
+                "const": "station-obs"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource",
+              "station"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "reason": {
+        "enum": [
+          "no-station-truth",
+          "insufficient-samples",
+          "elevation-gap-exceeded",
+          "stale-station-truth"
+        ]
+      },
+      "regionId": {
+        "type": "string"
+      },
+      "windowDays": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "regionId",
+      "windowDays",
+      "provenance",
+      "computedAt",
+      "disclaimerText",
+      "eligible",
+      "reason"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "message": {
+        "type": "string"
+      },
+      "status": {
+        "const": "not_found"
+      },
+      "suggestions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "name": {
+              "type": "string"
+            },
+            "slug": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "slug",
+            "name"
+          ],
+          "type": "object"
+        },
+        "maxItems": 3,
+        "type": "array"
+      },
+      "try": {
+        "const": "search_objectives"
+      }
+    },
+    "required": [
+      "status",
+      "message",
+      "try",
+      "suggestions",
+      "disclaimerText"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "knownRegionIds": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "message": {
+        "type": "string"
+      },
+      "status": {
+        "const": "not_found"
+      },
+      "suggestions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "name": {
+              "type": "string"
+            },
+            "slug": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "slug",
+            "name"
+          ],
+          "type": "object"
+        },
+        "maxItems": 3,
+        "type": "array"
+      },
+      "try": {
+        "const": "search_objectives"
+      }
+    },
+    "required": [
+      "status",
+      "message",
+      "try",
+      "suggestions",
+      "disclaimerText",
+      "knownRegionIds"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "error": {
+        "const": "invalid_input"
+      },
+      "fields": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "allowed": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "field": {
+              "type": "string"
+            },
+            "problem": {
+              "enum": [
+                "required",
+                "type",
+                "enum",
+                "length",
+                "pattern",
+                "range",
+                "format",
+                "not_in_window",
+                "unexpected"
+              ]
+            }
+          },
+          "required": [
+            "field",
+            "problem"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "message": {
+        "type": "string"
+      },
+      "requestId": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "error",
+      "message",
+      "requestId",
+      "disclaimerText",
+      "fields"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "error": {
+        "enum": [
+          "MCP_BUSY",
+          "MCP_RESPONSE_TOO_LARGE",
+          "MCP_VOICE_GATE_FAILED",
+          "MCP_TOOL_FAILED",
+          "MCP_OUTPUT_INVALID",
+          "rate_limited",
+          "processing_limit",
+          "response_limit"
+        ]
+      },
+      "message": {
+        "type": "string"
+      },
+      "requestId": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "error",
+      "message",
+      "requestId",
+      "disclaimerText"
+    ],
+    "type": "object"
+  }
+]

Changed2 schema fields changedOct 10, 2026

changedInput schema / properties / slug / description

Previous value: -"Public objective slug returned by search_objectives. It resolves to the accuracy region containing the objective. Provide exactly one of slug and region_id."New value: +"Public objective slug returned by search_objectives. It resolves to the accuracy region of the NWAC zone the objective is bound to. Provide exactly one of slug and region_id."

changedOutput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "computedAt": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "eligible": {
-        "type": "boolean"
-      },
-      "precipOccurrence": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "accuracyPct": {
-                "type": "number"
-              },
-              "n": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "accuracyPct",
-              "n"
-            ],
-            "type": "object"
-          },
-          {
-            "const": "insufficient"
-          }
-        ]
-      },
-      "provenance": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "replaySource": {
-                "const": "open-meteo-archive"
-              },
-              "truth": {
-                "const": "ifs-9km"
-              }
-            },
-            "required": [
-              "truth",
-              "replaySource"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "replaySource": {
-                "const": "open-meteo-archive"
-              },
-              "station": {
-                "additionalProperties": false,
-                "properties": {
-                  "distanceMi": {
-                    "type": "number"
-                  },
-                  "elevDeltaFt": {
-                    "type": "number"
-                  },
-                  "network": {
-                    "enum": [
-                      "snotel",
-                      "bc-asws",
-                      "synoptic"
-                    ]
-                  },
-                  "stationId": {
-                    "type": "string"
-                  },
-                  "stationName": {
-                    "type": "string"
-                  }
-                },
-                "required": [
-                  "stationId",
-                  "network",
-                  "stationName",
-                  "distanceMi",
-                  "elevDeltaFt"
-                ],
-                "type": "object"
-              },
-              "truth": {
-                "const": "station-obs"
-              }
-            },
-            "required": [
-              "truth",
-              "replaySource",
-              "station"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "reason": {
-        "enum": [
-          "no-station-truth",
-          "insufficient-samples",
-          "elevation-gap-exceeded",
-          "stale-station-truth"
-        ]
-      },
-      "regionId": {
-        "type": "string"
-      },
-      "sampleCount": {
-        "type": "number"
-      },
-      "temperature": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "biasF": {
-                "type": "number"
-              },
-              "maeF": {
-                "type": "number"
-              },
-              "n": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "maeF",
-              "biasF",
-              "n"
-            ],
-            "type": "object"
-          },
-          {
-            "const": "insufficient"
-          }
-        ]
-      },
-      "windowDays": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "regionId",
-      "windowDays",
-      "sampleCount",
-      "temperature",
-      "precipOccurrence",
-      "provenance",
-      "computedAt",
-      "eligible",
-      "disclaimerText"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "message": {
-        "type": "string"
-      },
-      "status": {
-        "const": "not_found"
-      },
-      "suggestions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "name": {
-              "type": "string"
-            },
-            "slug": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "slug",
-            "name"
-          ],
-          "type": "object"
-        },
-        "maxItems": 3,
-        "type": "array"
-      },
-      "try": {
-        "const": "search_objectives"
-      }
-    },
-    "required": [
-      "status",
-      "message",
-      "try",
-      "suggestions",
-      "disclaimerText"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "knownRegionIds": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "message": {
-        "type": "string"
-      },
-      "status": {
-        "const": "not_found"
-      },
-      "suggestions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "name": {
-              "type": "string"
-            },
-            "slug": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "slug",
-            "name"
-          ],
-          "type": "object"
-        },
-        "maxItems": 3,
-        "type": "array"
-      },
-      "try": {
-        "const": "search_objectives"
-      }
-    },
-    "required": [
-      "status",
-      "message",
-      "try",
-      "suggestions",
-      "disclaimerText",
-      "knownRegionIds"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "error": {
-        "const": "invalid_input"
-      },
-      "fields": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "allowed": {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "field": {
-              "type": "string"
-            },
-            "problem": {
-              "enum": [
-                "required",
-                "type",
-                "enum",
-                "length",
-                "pattern",
-                "range",
-                "unexpected"
-              ]
-            }
-          },
-          "required": [
-            "field",
-            "problem"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "message": {
-        "type": "string"
-      },
-      "requestId": {
-        "type": [
-          "string",
-          "null"
-        ]
-      }
-    },
-    "required": [
-      "error",
-      "message",
-      "requestId",
-      "disclaimerText",
-      "fields"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "error": {
-        "enum": [
-          "MCP_BUSY",
-          "MCP_RESPONSE_TOO_LARGE",
-          "MCP_VOICE_GATE_FAILED",
-          "MCP_TOOL_FAILED",
-          "rate_limited",
-          "processing_limit",
-          "response_limit"
-        ]
-      },
-      "message": {
-        "type": "string"
-      },
-      "requestId": {
-        "type": [
-          "string",
-          "null"
-        ]
-      }
-    },
-    "required": [
-      "error",
-      "message",
-      "requestId",
-      "disclaimerText"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "computedAt": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "eligible": {
+        "const": true
+      },
+      "precipOccurrence": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "accuracyPct": {
+                "type": "number"
+              },
+              "n": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "accuracyPct",
+              "n"
+            ],
+            "type": "object"
+          },
+          {
+            "const": "insufficient"
+          }
+        ]
+      },
+      "provenance": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "truth": {
+                "const": "ifs-9km"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "station": {
+                "additionalProperties": false,
+                "properties": {
+                  "distanceMi": {
+                    "type": "number"
+                  },
+                  "elevDeltaFt": {
+                    "type": "number"
+                  },
+                  "network": {
+                    "enum": [
+                      "snotel",
+                      "bc-asws",
+                      "synoptic"
+                    ]
+                  },
+                  "stationId": {
+                    "type": "string"
+                  },
+                  "stationName": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "stationId",
+                  "network",
+                  "stationName",
+                  "distanceMi",
+                  "elevDeltaFt"
+                ],
+                "type": "object"
+              },
+              "truth": {
+                "const": "station-obs"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource",
+              "station"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "regionId": {
+        "type": "string"
+      },
+      "temperature": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "biasF": {
+                "type": "number"
+              },
+              "maeF": {
+                "type": "number"
+              },
+              "n": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "maeF",
+              "biasF",
+              "n"
+            ],
+            "type": "object"
+          },
+          {
+            "const": "insufficient"
+          }
+        ]
+      },
+      "windowDays": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "regionId",
+      "windowDays",
+      "provenance",
+      "computedAt",
+      "disclaimerText",
+      "eligible",
+      "temperature",
+      "precipOccurrence"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "computedAt": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "eligible": {
+        "const": false
+      },
+      "provenance": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "truth": {
+                "const": "ifs-9km"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "replaySource": {
+                "const": "open-meteo-archive"
+              },
+              "station": {
+                "additionalProperties": false,
+                "properties": {
+                  "distanceMi": {
+                    "type": "number"
+                  },
+                  "elevDeltaFt": {
+                    "type": "number"
+                  },
+                  "network": {
+                    "enum": [
+                      "snotel",
+                      "bc-asws",
+                      "synoptic"
+                    ]
+                  },
+                  "stationId": {
+                    "type": "string"
+                  },
+                  "stationName": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "stationId",
+                  "network",
+                  "stationName",
+                  "distanceMi",
+                  "elevDeltaFt"
+                ],
+                "type": "object"
+              },
+              "truth": {
+                "const": "station-obs"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource",
+              "station"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "reason": {
+        "enum": [
+          "no-station-truth",
+          "insufficient-samples",
+          "elevation-gap-exceeded",
+          "stale-station-truth"
+        ]
+      },
+      "regionId": {
+        "type": "string"
+      },
+      "windowDays": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "regionId",
+      "windowDays",
+      "provenance",
+      "computedAt",
+      "disclaimerText",
+      "eligible",
+      "reason"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "message": {
+        "type": "string"
+      },
+      "status": {
+        "const": "not_found"
+      },
+      "suggestions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "name": {
+              "type": "string"
+            },
+            "slug": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "slug",
+            "name"
+          ],
+          "type": "object"
+        },
+        "maxItems": 3,
+        "type": "array"
+      },
+      "try": {
+        "const": "search_objectives"
+      }
+    },
+    "required": [
+      "status",
+      "message",
+      "try",
+      "suggestions",
+      "disclaimerText"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "knownRegionIds": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "message": {
+        "type": "string"
+      },
+      "status": {
+        "const": "not_found"
+      },
+      "suggestions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "name": {
+              "type": "string"
+            },
+            "slug": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "slug",
+            "name"
+          ],
+          "type": "object"
+        },
+        "maxItems": 3,
+        "type": "array"
+      },
+      "try": {
+        "const": "search_objectives"
+      }
+    },
+    "required": [
+      "status",
+      "message",
+      "try",
+      "suggestions",
+      "disclaimerText",
+      "knownRegionIds"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "error": {
+        "const": "invalid_input"
+      },
+      "fields": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "allowed": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "field": {
+              "type": "string"
+            },
+            "problem": {
+              "enum": [
+                "required",
+                "type",
+                "enum",
+                "length",
+                "pattern",
+                "range",
+                "format",
+                "not_in_window",
+                "unexpected"
+              ]
+            }
+          },
+          "required": [
+            "field",
+            "problem"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "message": {
+        "type": "string"
+      },
+      "requestId": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "error",
+      "message",
+      "requestId",
+      "disclaimerText",
+      "fields"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "error": {
+        "enum": [
+          "MCP_BUSY",
+          "MCP_RESPONSE_TOO_LARGE",
+          "MCP_VOICE_GATE_FAILED",
+          "MCP_TOOL_FAILED",
+          "rate_limited",
+          "processing_limit",
+          "response_limit"
+        ]
+      },
+      "message": {
+        "type": "string"
+      },
+      "requestId": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "required": [
+      "error",
+      "message",
+      "requestId",
+      "disclaimerText"
+    ],
+    "type": "object"
+  }
+]

Changed4 schema fields changedOct 9, 2026

changedInput schema / properties / region_id / description

Previous value: -"Public accuracy region identifier, for example pnw-olympics."New value: +"Public accuracy region identifier, for example pnw-olympics. Provide exactly one of region_id and slug."

addedInput schema / properties / slug

Added value: +{
+  "description": "Public objective slug returned by search_objectives. It resolves to the accuracy region containing the objective. Provide exactly one of slug and region_id.",
+  "maxLength": 256,
+  "minLength": 1,
+  "type": "string"
+}

removedInput schema / required
```
Removed value: -[
-  "region_id"
-]
```

changedOutput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "computedAt": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "disclaimerText": {
-        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
-      },
-      "eligible": {
-        "type": "boolean"
-      },
-      "precipOccurrence": {
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-                "const": "station-obs"
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-]New value: +[
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+    "properties": {
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+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
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+              "accuracyPct",
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+            "type": "object"
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+          {
+            "const": "insufficient"
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+      "provenance": {
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+            "properties": {
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+                "const": "open-meteo-archive"
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+                "const": "ifs-9km"
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+            "required": [
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+              "replaySource"
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+            "type": "object"
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+          {
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+                "const": "open-meteo-archive"
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+              "station": {
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+                "properties": {
+                  "distanceMi": {
+                    "type": "number"
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+                  "elevDeltaFt": {
+                    "type": "number"
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+                  "stationName",
+                  "distanceMi",
+                  "elevDeltaFt"
+                ],
+                "type": "object"
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+              "truth": {
+                "const": "station-obs"
+              }
+            },
+            "required": [
+              "truth",
+              "replaySource",
+              "station"
+            ],
+            "type": "object"
+          }
+        ]
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+      "reason": {
+        "enum": [
+          "no-station-truth",
+          "insufficient-samples",
+          "elevation-gap-exceeded",
+          "stale-station-truth"
+        ]
+      },
+      "regionId": {
+        "type": "string"
+      },
+      "sampleCount": {
+        "type": "number"
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+      "temperature": {
+        "oneOf": [
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+            "properties": {
+              "biasF": {
+                "type": "number"
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+              "maeF": {
+                "type": "number"
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+              "n": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "maeF",
+              "biasF",
+              "n"
+            ],
+            "type": "object"
+          },
+          {
+            "const": "insufficient"
+          }
+        ]
+      },
+      "windowDays": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "regionId",
+      "windowDays",
+      "sampleCount",
+      "temperature",
+      "precipOccurrence",
+      "provenance",
+      "computedAt",
+      "eligible",
+      "disclaimerText"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "message": {
+        "type": "string"
+      },
+      "status": {
+        "const": "not_found"
+      },
+      "suggestions": {
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+          "properties": {
+            "name": {
+              "type": "string"
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+            "slug": {
+              "type": "string"
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+          "required": [
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+            "name"
+          ],
+          "type": "object"
+        },
+        "maxItems": 3,
+        "type": "array"
+      },
+      "try": {
+        "const": "search_objectives"
+      }
+    },
+    "required": [
+      "status",
+      "message",
+      "try",
+      "suggestions",
+      "disclaimerText"
+    ],
+    "type": "object"
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+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
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+        "type": "array"
+      },
+      "message": {
+        "type": "string"
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+      "status": {
+        "const": "not_found"
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+      "suggestions": {
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+          "additionalProperties": false,
+          "properties": {
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+              "type": "string"
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+          "type": "object"
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+        "maxItems": 3,
+        "type": "array"
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+      "try": {
+        "const": "search_objectives"
+      }
+    },
+    "required": [
+      "status",
+      "message",
+      "try",
+      "suggestions",
+      "disclaimerText",
+      "knownRegionIds"
+    ],
+    "type": "object"
+  },
+  {
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+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "error": {
+        "const": "invalid_input"
+      },
+      "fields": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "allowed": {
+              "items": {
+                "type": "string"
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+              "type": "array"
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+            "field": {
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+            "problem": {
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+                "range",
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+          "required": [
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+          "type": "object"
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+        "type": "array"
+      },
+      "message": {
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+          "string",
+          "null"
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+      }
+    },
+    "required": [
+      "error",
+      "message",
+      "requestId",
+      "disclaimerText",
+      "fields"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "disclaimerText": {
+        "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+      },
+      "error": {
+        "enum": [
+          "MCP_BUSY",
+          "MCP_RESPONSE_TOO_LARGE",
+          "MCP_VOICE_GATE_FAILED",
+          "MCP_TOOL_FAILED",
+          "rate_limited",
+          "processing_limit",
+          "response_limit"
+        ]
+      },
+      "message": {
+        "type": "string"
+      },
+      "requestId": {
+        "type": [
+          "string",
+          "null"
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+      }
+    },
+    "required": [
+      "error",
+      "message",
+      "requestId",
+      "disclaimerText"
+    ],
+    "type": "object"
+  }
+]

Changed1 schema field changedOct 4, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "oneOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "computedAt": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "disclaimerText": {
+          "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+        },
+        "eligible": {
+          "type": "boolean"
+        },
+        "precipOccurrence": {
+          "oneOf": [
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+              "properties": {
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+                  "type": "number"
+                },
+                "n": {
+                  "type": "number"
+                }
+              },
+              "required": [
+                "accuracyPct",
+                "n"
+              ],
+              "type": "object"
+            },
+            {
+              "const": "insufficient"
+            }
+          ]
+        },
+        "provenance": {
+          "oneOf": [
+            {
+              "additionalProperties": false,
+              "properties": {
+                "replaySource": {
+                  "const": "open-meteo-archive"
+                },
+                "truth": {
+                  "const": "ifs-9km"
+                }
+              },
+              "required": [
+                "truth",
+                "replaySource"
+              ],
+              "type": "object"
+            },
+            {
+              "additionalProperties": false,
+              "properties": {
+                "replaySource": {
+                  "const": "open-meteo-archive"
+                },
+                "station": {
+                  "additionalProperties": false,
+                  "properties": {
+                    "distanceMi": {
+                      "type": "number"
+                    },
+                    "elevDeltaFt": {
+                      "type": "number"
+                    },
+                    "network": {
+                      "enum": [
+                        "snotel",
+                        "bc-asws",
+                        "synoptic"
+                      ]
+                    },
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+                      "type": "string"
+                    },
+                    "stationName": {
+                      "type": "string"
+                    }
+                  },
+                  "required": [
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+                    "network",
+                    "stationName",
+                    "distanceMi",
+                    "elevDeltaFt"
+                  ],
+                  "type": "object"
+                },
+                "truth": {
+                  "const": "station-obs"
+                }
+              },
+              "required": [
+                "truth",
+                "replaySource",
+                "station"
+              ],
+              "type": "object"
+            }
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+        },
+        "reason": {
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+            "no-station-truth",
+            "insufficient-samples",
+            "elevation-gap-exceeded",
+            "stale-station-truth"
+          ]
+        },
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+        "sampleCount": {
+          "type": "number"
+        },
+        "temperature": {
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+              "properties": {
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+                  "type": "number"
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+                "maeF": {
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+                  "type": "number"
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+              "required": [
+                "maeF",
+                "biasF",
+                "n"
+              ],
+              "type": "object"
+            },
+            {
+              "const": "insufficient"
+            }
+          ]
+        },
+        "windowDays": {
+          "type": "number"
+        }
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+      "required": [
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+        "temperature",
+        "precipOccurrence",
+        "provenance",
+        "computedAt",
+        "eligible",
+        "disclaimerText"
+      ],
+      "type": "object"
+    },
+    {
+      "additionalProperties": false,
+      "properties": {
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+          "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+        },
+        "message": {
+          "type": "string"
+        },
+        "status": {
+          "const": "not_found"
+        },
+        "suggestions": {
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+            "properties": {
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+                "type": "string"
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+              "name"
+            ],
+            "type": "object"
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+          "maxItems": 3,
+          "type": "array"
+        },
+        "try": {
+          "const": "search_objectives"
+        }
+      },
+      "required": [
+        "status",
+        "message",
+        "try",
+        "suggestions",
+        "disclaimerText"
+      ],
+      "type": "object"
+    },
+    {
+      "additionalProperties": false,
+      "properties": {
+        "disclaimerText": {
+          "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+        },
+        "error": {
+          "const": "invalid_input"
+        },
+        "fields": {
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "allowed": {
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+        }
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+      "type": "object"
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+      "properties": {
+        "disclaimerText": {
+          "const": "This data is for informational purposes only. ClimbCast presents information, you manage risk. Ratings are decision-support heuristics, not advice. For any safety-critical decision, always consult the official source bulletin directly. Forecasts may contain errors and are not a substitute for sound human judgment. Weather and avalanche conditions can change rapidly and without warning. You are solely responsible for your decisions in the outdoors."
+        },
+        "error": {
+          "enum": [
+            "MCP_BUSY",
+            "MCP_RESPONSE_TOO_LARGE",
+            "MCP_VOICE_GATE_FAILED",
+            "MCP_TOOL_FAILED",
+            "rate_limited",
+            "processing_limit",
+            "response_limit"
+          ]
+        },
+        "message": {
+          "type": "string"
+        },
+        "requestId": {
+          "type": [
+            "string",
+            "null"
+          ]
+        }
+      },
+      "required": [
+        "error",
+        "message",
+        "requestId",
+        "disclaimerText"
+      ],
+      "type": "object"
+    }
+  ],
+  "type": "object"
+}

First observedSep 27, 2026

TDQS

A4/5.0

Behavior4/5

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

Annotations already cover the read-only, idempotent, non-destructive, closed-world profile, so the bar is lower, and the description still adds real value: 'stored' signals precomputed rather than live computation, 'observed-station or model-proxy truth lineage' warns the truth source varies by region, and 'data sufficiency, and eligibility' warns results can be gated or absent. 'Informational only' sets decision-use expectations. What is not disclosed is the failure mode when neither identifier is supplied.

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?

Three short sentences, front-loaded with what is returned before how it is addressed and the usage disclaimer. No filler, and the closing 'Informational only' earns its place as a scope caveat.

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?

With an output schema present, return shape needn't be described, and annotations plus full parameter coverage handle safety and inputs. The description supplies the two things structured fields can't: that values are stored/precomputed with variable truth lineage, and that sufficiency/eligibility can suppress results. Only the no-identifier case is left implicit.

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 the schema already documents both parameters, the mutual-exclusivity rule, and the slug-resolution behavior. The description's sentence about region_id/slug resolution largely restates the schema rather than adding new semantics, making the baseline 3 correct.

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 ('Returns stored public regional forecast accuracy') and enumerates the substantive payload (truth lineage, data sufficiency, eligibility). This is clearly distinct from every sibling, which retrieve conditions, alerts, permits, or objective metadata rather than scoring historical forecast performance.

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

Usage Guidelines3/5

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

The description explains how to invoke it ('takes either a region_id or an objective slug') and adds an 'Informational only' disclaimer, but never says when this tool should be chosen over an alternative. Notably it does not point at search_objectives for obtaining the slug, even though that is the sibling an agent must call first in slug mode.

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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