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Read health data

read_health_data

Read-onlyIdempotent

Get a daily overview of key health metrics—steps, sleep, resting heart rate, weight, workout minutes, mood, and water intake—for any date range.

Instructions

Read daily health metrics from the local database: steps, sleep hours, resting heart rate, weight (kg), workout minutes, mood, and water intake (ml).

Use this tool when:

the request is broad/general, across multiple metrics at once (e.g. "what health data do I have?", "overview of this week").

Do not use this tool when:

the user wants one specific metric's history/trend over time -> use get_metric_history instead.
the user wants raw/individual measurement rows (timestamp, source) -> use read_measurements instead.
the user wants workout sessions specifically -> use read_workout_sessions instead.
the user is asking why something changed, or wants a trend, anomaly, comparison, or correlation -> use explain_metric_change (one metric, one date) or get_recent_changes (scan across all metrics) instead.

Privacy note: this server and its SQLite file are entirely local, but the data returned by this tool becomes part of the conversation sent to whatever model the calling client is configured with. If that model runs in the cloud rather than on your machine, treat this the same as pasting the data into a chat with that provider.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`end_date`	No	Last day to include, formatted YYYY-MM-DD. Defaults to today.
`start_date`	No	First day to include, formatted YYYY-MM-DD. Defaults to 30 days before end_date. Ranges over ~10 years are rejected.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`rows`	Yes
`range`	Yes
`summary`	Yes
`truncated`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed9 schema fields changedv1.0.16Sep 15, 2026

addedInput schema / properties / end_date / description

Added value: +"Last day to include, formatted YYYY-MM-DD. Defaults to today."

addedInput schema / properties / start_date / description

Added value: +"First day to include, formatted YYYY-MM-DD.\nDefaults to 30 days before end_date. Ranges over ~10 years are rejected."

addedOutput schema / properties / range

Added value: +{
+  "properties": {
+    "end_date": {
+      "type": "string"
+    },
+    "start_date": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "start_date",
+    "end_date"
+  ],
+  "type": "object"
+}

removedOutput schema / properties / result

Removed value: -{
-  "type": "string"
-}

addedOutput schema / properties / rows

Added value: +{
+  "items": {
+    "properties": {
+      "date": {
+        "type": "string"
+      },
+      "heart_rate": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "hrv_ms": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "mood": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "resting_heart_rate": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "sleep_hours": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "steps": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "water_ml": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "weight_kg": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "workout_minutes": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      }
+    },
+    "required": [
+      "date"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

addedOutput schema / properties / summary

Added value: +{
+  "properties": {
+    "days_with_data": {
+      "type": "integer"
+    },
+    "heart_rate": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "hrv_ms": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "mood": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "resting_heart_rate": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "sleep_hours": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "steps": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "water_ml": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "weight_kg": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "workout_minutes": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    }
+  },
+  "required": [
+    "days_with_data",
+    "steps",
+    "sleep_hours",
+    "resting_heart_rate",
+    "weight_kg",
+    "workout_minutes",
+    "mood",
+    "water_ml",
+    "heart_rate",
+    "hrv_ms"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / truncated
```
Added value: +{
+  "type": "boolean"
+}
```

changedOutput schema / required

Previous value: -[
-  "result"
-]New value: +[
+  "range",
+  "rows",
+  "truncated",
+  "summary"
+]

removedOutput schema / x-fastmcp-wrap-result
```
Removed value: -true
```

Changed9 schema fields changedv1.0.15Sep 15, 2026

removedInput schema / properties / end_date / description

Removed value: -"Last day to include, formatted YYYY-MM-DD. Defaults to today."

removedInput schema / properties / start_date / description

Removed value: -"First day to include, formatted YYYY-MM-DD.\nDefaults to 30 days before end_date. Ranges over ~10 years are rejected."

removedOutput schema / properties / range

Removed value: -{
-  "properties": {
-    "end_date": {
-      "type": "string"
-    },
-    "start_date": {
-      "type": "string"
-    }
-  },
-  "required": [
-    "start_date",
-    "end_date"
-  ],
-  "type": "object"
-}

addedOutput schema / properties / result
```
Added value: +{
+  "type": "string"
+}
```

removedOutput schema / properties / rows

Removed value: -{
-  "items": {
-    "properties": {
-      "date": {
-        "type": "string"
-      },
-      "heart_rate": {
-        "anyOf": [
-          {
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      },
-      "hrv_ms": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      },
-      "mood": {
-        "anyOf": [
-          {
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      },
-      "resting_heart_rate": {
-        "anyOf": [
-          {
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      },
-      "sleep_hours": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      },
-      "steps": {
-        "anyOf": [
-          {
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      },
-      "water_ml": {
-        "anyOf": [
-          {
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      },
-      "weight_kg": {
-        "anyOf": [
-          {
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      },
-      "workout_minutes": {
-        "anyOf": [
-          {
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null
-      }
-    },
-    "required": [
-      "date"
-    ],
-    "type": "object"
-  },
-  "type": "array"
-}

removedOutput schema / properties / summary

Removed value: -{
-  "properties": {
-    "days_with_data": {
-      "type": "integer"
-    },
-    "heart_rate": {
-      "properties": {
-        "avg": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "max": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "min": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "type": "object"
-    },
-    "hrv_ms": {
-      "properties": {
-        "avg": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "max": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "min": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "type": "object"
-    },
-    "mood": {
-      "properties": {
-        "avg": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "max": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "min": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "type": "object"
-    },
-    "resting_heart_rate": {
-      "properties": {
-        "avg": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "max": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "min": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "type": "object"
-    },
-    "sleep_hours": {
-      "properties": {
-        "avg": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "max": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "min": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "type": "object"
-    },
-    "steps": {
-      "properties": {
-        "avg": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "max": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "min": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "type": "object"
-    },
-    "water_ml": {
-      "properties": {
-        "avg": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "max": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "min": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "type": "object"
-    },
-    "weight_kg": {
-      "properties": {
-        "avg": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "max": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "min": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "type": "object"
-    },
-    "workout_minutes": {
-      "properties": {
-        "avg": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "max": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        },
-        "min": {
-          "anyOf": [
-            {
-              "type": "number"
-            },
-            {
-              "type": "null"
-            }
-          ],
-          "default": null
-        }
-      },
-      "type": "object"
-    }
-  },
-  "required": [
-    "days_with_data",
-    "steps",
-    "sleep_hours",
-    "resting_heart_rate",
-    "weight_kg",
-    "workout_minutes",
-    "mood",
-    "water_ml",
-    "heart_rate",
-    "hrv_ms"
-  ],
-  "type": "object"
-}

removedOutput schema / properties / truncated
```
Removed value: -{
-  "type": "boolean"
-}
```

changedOutput schema / required

Previous value: -[
-  "range",
-  "rows",
-  "truncated",
-  "summary"
-]New value: +[
+  "result"
+]

addedOutput schema / x-fastmcp-wrap-result
```
Added value: +true
```

Changed5 schema fields changedv1.0.11Sep 13, 2026

addedOutput schema / properties / rows / items / properties / heart_rate

Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null
+}

addedOutput schema / properties / rows / items / properties / hrv_ms

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null
+}

addedOutput schema / properties / summary / properties / heart_rate

Added value: +{
+  "properties": {
+    "avg": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null
+    },
+    "max": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null
+    },
+    "min": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null
+    }
+  },
+  "type": "object"
+}

addedOutput schema / properties / summary / properties / hrv_ms

Added value: +{
+  "properties": {
+    "avg": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null
+    },
+    "max": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null
+    },
+    "min": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "default": null
+    }
+  },
+  "type": "object"
+}

changedOutput schema / properties / summary / required

Previous value: -[
-  "days_with_data",
-  "steps",
-  "sleep_hours",
-  "resting_heart_rate",
-  "weight_kg",
-  "workout_minutes",
-  "mood",
-  "water_ml"
-]New value: +[
+  "days_with_data",
+  "steps",
+  "sleep_hours",
+  "resting_heart_rate",
+  "weight_kg",
+  "workout_minutes",
+  "mood",
+  "water_ml",
+  "heart_rate",
+  "hrv_ms"
+]

Changed7 schema fields changedv1.0.8Sep 7, 2026

addedOutput schema / properties / range

Added value: +{
+  "properties": {
+    "end_date": {
+      "type": "string"
+    },
+    "start_date": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "start_date",
+    "end_date"
+  ],
+  "type": "object"
+}

removedOutput schema / properties / result

Removed value: -{
-  "type": "string"
-}

addedOutput schema / properties / rows

Added value: +{
+  "items": {
+    "properties": {
+      "date": {
+        "type": "string"
+      },
+      "mood": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "resting_heart_rate": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "sleep_hours": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "steps": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "water_ml": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "weight_kg": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      },
+      "workout_minutes": {
+        "anyOf": [
+          {
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null
+      }
+    },
+    "required": [
+      "date"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

addedOutput schema / properties / summary

Added value: +{
+  "properties": {
+    "days_with_data": {
+      "type": "integer"
+    },
+    "mood": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "resting_heart_rate": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "sleep_hours": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "steps": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "water_ml": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "weight_kg": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    },
+    "workout_minutes": {
+      "properties": {
+        "avg": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "max": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "min": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "type": "object"
+    }
+  },
+  "required": [
+    "days_with_data",
+    "steps",
+    "sleep_hours",
+    "resting_heart_rate",
+    "weight_kg",
+    "workout_minutes",
+    "mood",
+    "water_ml"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / truncated
```
Added value: +{
+  "type": "boolean"
+}
```

changedOutput schema / required

Previous value: -[
-  "result"
-]New value: +[
+  "range",
+  "rows",
+  "truncated",
+  "summary"
+]

removedOutput schema / x-fastmcp-wrap-result
```
Removed value: -true
```

Changed1 schema field changedv1.0.3Aug 29, 2026

changedInput schema / properties / start_date / description

Previous value: -"First day to include, formatted YYYY-MM-DD.\n        Defaults to 30 days before end_date."New value: +"First day to include, formatted YYYY-MM-DD.\nDefaults to 30 days before end_date. Ranges over ~10 years are rejected."

First observedv1.0.0Aug 26, 2026

TDQS

A4.5/5.0

Behavior4/5

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

Annotations already declare readOnlyHint and idempotentHint, so the safety profile is covered. The description adds valuable context beyond annotations with the privacy note about data becoming part of the conversation sent to the client's model, and clarifies that the underlying storage is a local SQLite file. Minor missing details like return shape are handled by the output schema.

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

Conciseness5/5

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

The description is front-loaded with the core behavior, then uses clear use/do-not-use sections, then a privacy caveat. Every sentence earns its place, and the routing content is dense but scannable. The length is justified given the large sibling set.

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

Completeness5/5

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

For a read-only list tool with an output schema, the description covers purpose, metric scope, parameter behavior via schema, sibling routing, and the privacy implications of the returned data. There are no significant gaps an agent would need to fill before calling it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, and both start_date and end_date already have clear format, default, and range-rejection documentation. The description does not add parameter-level detail, but it also does not need to since the schema fully explains them. Baseline 3 is appropriate.

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

Purpose5/5

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

The description opens with a specific verb-resource pairing: 'Read daily health metrics from the local database,' and enumerates the exact metrics included. It also distinguishes itself from siblings by emphasizing broad/general access, and the do-not-use list names the precise alternatives. This leaves no ambiguity about what the tool does.

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

Usage Guidelines5/5

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

The description provides explicit use-when criteria ('broad/general, across multiple metrics at once') and a thorough do-not-use section routing to specific sibling tools like get_metric_history, read_measurements, and explain_metric_change. This is model-actionable guidance that prevents selecting the wrong tool.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Deploy Server

Read health data

Instructions

Input Schema

Output Schema

Schema Changelog

TDQS

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