Lviv Public Transport

Get Stop Realtime

get_stop_realtime

Read-onlyIdempotent

Returns live arrivals at a stop: route, destination, vehicle type, minutes until arrival, and each vehicle's position. Use this as the default tool when the user asks about arrivals, departures, or the next bus/tram at a specific stop. Requires a numeric stop ID (shown on stop signage); use search_stops when you have a stop name, or get_stops_around_location when you have coordinates.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`stop_id`	Yes	Municipal stop code shown on stop signage (e.g. 707). Accepts a positive integer or an equivalent digit-only string.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`data`	Yes
`view`	Yes
`ui_blocks`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 23, 2026

changedOutput schema / properties / ui_blocks / items / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "data": {
-        "additionalProperties": false,
-        "properties": {
-          "center": {
-            "additionalItems": false,
-            "items": [
-              {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              },
-              {
-                "type": [
-                  "number",
-                  "null"
-                ]
-              }
-            ],
-            "maxItems": 2,
-            "minItems": 2,
-            "type": "array"
-          },
-          "stop": {
-            "anyOf": [
-              {
-                "additionalProperties": false,
-                "properties": {
-                  "id": {
-                    "type": "string"
-                  },
-                  "lat": {
-                    "type": [
-                      "number",
-                      "null"
-                    ]
-                  },
-                  "lng": {
-                    "type": [
-                      "number",
-                      "null"
-                    ]
-                  },
-                  "name": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  }
-                },
-                "required": [
-                  "id",
-                  "name",
-                  "lat",
-                  "lng"
-                ],
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "vehicles": {
-            "items": {
-              "additionalProperties": false,
-              "properties": {
-                "bearing": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "eta_minutes": {
-                  "anyOf": [
-                    {
-                      "maximum": 9007199254740991,
-                      "minimum": -9007199254740991,
-                      "type": "integer"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "eta_status": {
-                  "enum": [
-                    "assigned",
-                    "unassigned"
-                  ],
-                  "type": "string"
-                },
-                "id": {
-                  "type": "string"
-                },
-                "lat": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "lng": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "next_stop_id": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "route": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                }
-              },
-              "required": [
-                "id",
-                "route",
-                "lat",
-                "lng",
-                "bearing",
-                "next_stop_id",
-                "eta_minutes",
-                "eta_status"
-              ],
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "zoom": {
-            "type": "number"
-          }
-        },
-        "required": [
-          "center",
-          "zoom",
-          "stop",
-          "vehicles"
-        ],
-        "type": "object"
-      },
-      "type": {
-        "const": "map",
-        "type": "string"
-      }
-    },
-    "required": [
-      "type",
-      "data"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "data": {
-        "additionalProperties": false,
-        "properties": {
-          "arrivals": {
-            "items": {
-              "additionalProperties": false,
-              "properties": {
-                "arrival_minutes": {
-                  "anyOf": [
-                    {
-                      "maximum": 9007199254740991,
-                      "minimum": -9007199254740991,
-                      "type": "integer"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "bearing": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "direction": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "lat": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "lng": {
-                  "type": [
-                    "number",
-                    "null"
-                  ]
-                },
-                "route": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "vehicle_id": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                },
-                "vehicle_type": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                }
-              },
-              "required": [
-                "route",
-                "direction",
-                "vehicle_type",
-                "arrival_minutes",
-                "vehicle_id",
-                "lat",
-                "lng",
-                "bearing"
-              ],
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "stop": {
-            "anyOf": [
-              {
-                "additionalProperties": false,
-                "properties": {
-                  "id": {
-                    "type": "string"
-                  },
-                  "lat": {
-                    "type": [
-                      "number",
-                      "null"
-                    ]
-                  },
-                  "lng": {
-                    "type": [
-                      "number",
-                      "null"
-                    ]
-                  },
-                  "name": {
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  }
-                },
-                "required": [
-                  "id",
-                  "name",
-                  "lat",
-                  "lng"
-                ],
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "required": [
-          "stop",
-          "arrivals"
-        ],
-        "type": "object"
-      },
-      "type": {
-        "const": "arrival_list",
-        "type": "string"
-      }
-    },
-    "required": [
-      "type",
-      "data"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "data": {
+        "additionalProperties": false,
+        "properties": {
+          "center": {
+            "additionalItems": false,
+            "items": [
+              {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            ],
+            "maxItems": 2,
+            "minItems": 2,
+            "type": "array"
+          },
+          "layers": {
+            "additionalProperties": false,
+            "properties": {
+              "polylines": {
+                "type": "string"
+              },
+              "stops": {
+                "type": "string"
+              },
+              "vehicles": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "zoom": {
+            "type": "number"
+          }
+        },
+        "required": [
+          "center",
+          "zoom",
+          "layers"
+        ],
+        "type": "object"
+      },
+      "type": {
+        "const": "map",
+        "type": "string"
+      }
+    },
+    "required": [
+      "type",
+      "data"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "data": {
+        "additionalProperties": false,
+        "properties": {
+          "source": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "source"
+        ],
+        "type": "object"
+      },
+      "type": {
+        "const": "arrival_list",
+        "type": "string"
+      }
+    },
+    "required": [
+      "type",
+      "data"
+    ],
+    "type": "object"
+  }
+]

Changed21 schema fields changedSep 6, 2026

removedOutput schema / properties / data / properties / arrivals / items / properties / bearing / anyOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / data / properties / arrivals / items / properties / bearing / type
```
Added value: +[
+  "number",
+  "null"
+]
```
removedOutput schema / properties / data / properties / arrivals / items / properties / direction / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / data / properties / arrivals / items / properties / direction / type
```
Added value: +[
+  "string",
+  "null"
+]
```
removedOutput schema / properties / data / properties / arrivals / items / properties / lat / anyOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / data / properties / arrivals / items / properties / lat / type
```
Added value: +[
+  "number",
+  "null"
+]
```
removedOutput schema / properties / data / properties / arrivals / items / properties / lng / anyOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / data / properties / arrivals / items / properties / lng / type
```
Added value: +[
+  "number",
+  "null"
+]
```
removedOutput schema / properties / data / properties / arrivals / items / properties / route / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / data / properties / arrivals / items / properties / route / type
```
Added value: +[
+  "string",
+  "null"
+]
```
removedOutput schema / properties / data / properties / arrivals / items / properties / vehicle_id / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / data / properties / arrivals / items / properties / vehicle_id / type
```
Added value: +[
+  "string",
+  "null"
+]
```
removedOutput schema / properties / data / properties / arrivals / items / properties / vehicle_type / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / data / properties / arrivals / items / properties / vehicle_type / type
```
Added value: +[
+  "string",
+  "null"
+]
```
removedOutput schema / properties / data / properties / stop / properties / lat / anyOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / data / properties / stop / properties / lat / type
```
Added value: +[
+  "number",
+  "null"
+]
```
removedOutput schema / properties / data / properties / stop / properties / lng / anyOf
```
Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / data / properties / stop / properties / lng / type
```
Added value: +[
+  "number",
+  "null"
+]
```
removedOutput schema / properties / data / properties / stop / properties / name / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / data / properties / stop / properties / name / type
```
Added value: +[
+  "string",
+  "null"
+]
```

changedOutput schema / properties / ui_blocks / items / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "data": {
-        "additionalProperties": false,
-        "properties": {
-          "center": {
-            "items": [
-              {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              {
-                "anyOf": [
-                  {
-                    "type": "number"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            ],
-            "type": "array"
-          },
-          "stop": {
-            "anyOf": [
-              {
-                "additionalProperties": false,
-                "properties": {
-                  "id": {
-                    "type": "string"
-                  },
-                  "lat": {
-                    "anyOf": [
-                      {
-                        "type": "number"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "lng": {
-                    "anyOf": [
-                      {
-                        "type": "number"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "name": {
-                    "anyOf": [
-                      {
-                        "type": "string"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  }
-                },
-                "required": [
-                  "id",
-                  "name",
-                  "lat",
-                  "lng"
-                ],
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "vehicles": {
-            "items": {
-              "additionalProperties": false,
-              "properties": {
-                "bearing": {
-                  "anyOf": [
-                    {
-                      "type": "number"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "eta_minutes": {
-                  "anyOf": [
-                    {
-                      "maximum": 9007199254740991,
-                      "minimum": -9007199254740991,
-                      "type": "integer"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "eta_status": {
-                  "enum": [
-                    "assigned",
-                    "unassigned"
-                  ],
-                  "type": "string"
-                },
-                "id": {
-                  "type": "string"
-                },
-                "lat": {
-                  "anyOf": [
-                    {
-                      "type": "number"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "lng": {
-                  "anyOf": [
-                    {
-                      "type": "number"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "next_stop_id": {
-                  "anyOf": [
-                    {
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "route": {
-                  "anyOf": [
-                    {
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                }
-              },
-              "required": [
-                "id",
-                "route",
-                "lat",
-                "lng",
-                "bearing",
-                "next_stop_id",
-                "eta_minutes",
-                "eta_status"
-              ],
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "zoom": {
-            "type": "number"
-          }
-        },
-        "required": [
-          "center",
-          "zoom",
-          "stop",
-          "vehicles"
-        ],
-        "type": "object"
-      },
-      "type": {
-        "const": "map",
-        "type": "string"
-      }
-    },
-    "required": [
-      "type",
-      "data"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "data": {
-        "additionalProperties": false,
-        "properties": {
-          "arrivals": {
-            "items": {
-              "additionalProperties": false,
-              "properties": {
-                "arrival_minutes": {
-                  "anyOf": [
-                    {
-                      "maximum": 9007199254740991,
-                      "minimum": -9007199254740991,
-                      "type": "integer"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "bearing": {
-                  "anyOf": [
-                    {
-                      "type": "number"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "direction": {
-                  "anyOf": [
-                    {
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "lat": {
-                  "anyOf": [
-                    {
-                      "type": "number"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "lng": {
-                  "anyOf": [
-                    {
-                      "type": "number"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "route": {
-                  "anyOf": [
-                    {
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "vehicle_id": {
-                  "anyOf": [
-                    {
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "vehicle_type": {
-                  "anyOf": [
-                    {
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                }
-              },
-              "required": [
-                "route",
-                "direction",
-                "vehicle_type",
-                "arrival_minutes",
-                "vehicle_id",
-                "lat",
-                "lng",
-                "bearing"
-              ],
-              "type": "object"
-            },
-            "type": "array"
-          },
-          "stop": {
-            "anyOf": [
-              {
-                "additionalProperties": false,
-                "properties": {
-                  "id": {
-                    "type": "string"
-                  },
-                  "lat": {
-                    "anyOf": [
-                      {
-                        "type": "number"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "lng": {
-                    "anyOf": [
-                      {
-                        "type": "number"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  },
-                  "name": {
-                    "anyOf": [
-                      {
-                        "type": "string"
-                      },
-                      {
-                        "type": "null"
-                      }
-                    ]
-                  }
-                },
-                "required": [
-                  "id",
-                  "name",
-                  "lat",
-                  "lng"
-                ],
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "required": [
-          "stop",
-          "arrivals"
-        ],
-        "type": "object"
-      },
-      "type": {
-        "const": "arrival_list",
-        "type": "string"
-      }
-    },
-    "required": [
-      "type",
-      "data"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "data": {
+        "additionalProperties": false,
+        "properties": {
+          "center": {
+            "additionalItems": false,
+            "items": [
+              {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            ],
+            "maxItems": 2,
+            "minItems": 2,
+            "type": "array"
+          },
+          "stop": {
+            "anyOf": [
+              {
+                "additionalProperties": false,
+                "properties": {
+                  "id": {
+                    "type": "string"
+                  },
+                  "lat": {
+                    "type": [
+                      "number",
+                      "null"
+                    ]
+                  },
+                  "lng": {
+                    "type": [
+                      "number",
+                      "null"
+                    ]
+                  },
+                  "name": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  }
+                },
+                "required": [
+                  "id",
+                  "name",
+                  "lat",
+                  "lng"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "vehicles": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "bearing": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "eta_minutes": {
+                  "anyOf": [
+                    {
+                      "maximum": 9007199254740991,
+                      "minimum": -9007199254740991,
+                      "type": "integer"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "eta_status": {
+                  "enum": [
+                    "assigned",
+                    "unassigned"
+                  ],
+                  "type": "string"
+                },
+                "id": {
+                  "type": "string"
+                },
+                "lat": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "lng": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "next_stop_id": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "route": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "required": [
+                "id",
+                "route",
+                "lat",
+                "lng",
+                "bearing",
+                "next_stop_id",
+                "eta_minutes",
+                "eta_status"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "zoom": {
+            "type": "number"
+          }
+        },
+        "required": [
+          "center",
+          "zoom",
+          "stop",
+          "vehicles"
+        ],
+        "type": "object"
+      },
+      "type": {
+        "const": "map",
+        "type": "string"
+      }
+    },
+    "required": [
+      "type",
+      "data"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "data": {
+        "additionalProperties": false,
+        "properties": {
+          "arrivals": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "arrival_minutes": {
+                  "anyOf": [
+                    {
+                      "maximum": 9007199254740991,
+                      "minimum": -9007199254740991,
+                      "type": "integer"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "bearing": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "direction": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "lat": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "lng": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "route": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "vehicle_id": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "vehicle_type": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "required": [
+                "route",
+                "direction",
+                "vehicle_type",
+                "arrival_minutes",
+                "vehicle_id",
+                "lat",
+                "lng",
+                "bearing"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "stop": {
+            "anyOf": [
+              {
+                "additionalProperties": false,
+                "properties": {
+                  "id": {
+                    "type": "string"
+                  },
+                  "lat": {
+                    "type": [
+                      "number",
+                      "null"
+                    ]
+                  },
+                  "lng": {
+                    "type": [
+                      "number",
+                      "null"
+                    ]
+                  },
+                  "name": {
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  }
+                },
+                "required": [
+                  "id",
+                  "name",
+                  "lat",
+                  "lng"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "required": [
+          "stop",
+          "arrivals"
+        ],
+        "type": "object"
+      },
+      "type": {
+        "const": "arrival_list",
+        "type": "string"
+      }
+    },
+    "required": [
+      "type",
+      "data"
+    ],
+    "type": "object"
+  }
+]

Changed4 schema fields changedAug 12, 2026

removedInput schema / properties / stop_id / anyOf

Removed value: -[
-  {
-    "description": "Positive integer stop code (e.g. 707).",
-    "exclusiveMinimum": 0,
-    "maximum": 9007199254740991,
-    "type": "integer"
-  },
-  {
-    "description": "Stop code as a digits-only string (e.g. \"707\").",
-    "pattern": "^\\d+$",
-    "type": "string"
-  }
-]

addedInput schema / properties / stop_id / exclusiveMinimum
```
Added value: +0
```
addedInput schema / properties / stop_id / maximum
```
Added value: +9007199254740991
```
addedInput schema / properties / stop_id / type
```
Added value: +"integer"
```

Changed1 schema field changedApr 30, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "data": {
+      "additionalProperties": false,
+      "properties": {
+        "arrivals": {
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "arrival_minutes": {
+                "anyOf": [
+                  {
+                    "maximum": 9007199254740991,
+                    "minimum": -9007199254740991,
+                    "type": "integer"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "bearing": {
+                "anyOf": [
+                  {
+                    "type": "number"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "direction": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "lat": {
+                "anyOf": [
+                  {
+                    "type": "number"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "lng": {
+                "anyOf": [
+                  {
+                    "type": "number"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "route": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "vehicle_id": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "vehicle_type": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "required": [
+              "route",
+              "direction",
+              "vehicle_type",
+              "arrival_minutes",
+              "vehicle_id",
+              "lat",
+              "lng",
+              "bearing"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "stop": {
+          "additionalProperties": false,
+          "properties": {
+            "id": {
+              "type": "string"
+            },
+            "lat": {
+              "anyOf": [
+                {
+                  "type": "number"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "lng": {
+              "anyOf": [
+                {
+                  "type": "number"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "name": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            }
+          },
+          "required": [
+            "id",
+            "name",
+            "lat",
+            "lng"
+          ],
+          "type": "object"
+        },
+        "updated_at": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "stop",
+        "arrivals",
+        "updated_at"
+      ],
+      "type": "object"
+    },
+    "ui_blocks": {
+      "items": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "data": {
+                "additionalProperties": false,
+                "properties": {
+                  "center": {
+                    "items": [
+                      {
+                        "anyOf": [
+                          {
+                            "type": "number"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      {
+                        "anyOf": [
+                          {
+                            "type": "number"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      }
+                    ],
+                    "type": "array"
+                  },
+                  "stop": {
+                    "anyOf": [
+                      {
+                        "additionalProperties": false,
+                        "properties": {
+                          "id": {
+                            "type": "string"
+                          },
+                          "lat": {
+                            "anyOf": [
+                              {
+                                "type": "number"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          },
+                          "lng": {
+                            "anyOf": [
+                              {
+                                "type": "number"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          },
+                          "name": {
+                            "anyOf": [
+                              {
+                                "type": "string"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          }
+                        },
+                        "required": [
+                          "id",
+                          "name",
+                          "lat",
+                          "lng"
+                        ],
+                        "type": "object"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  },
+                  "vehicles": {
+                    "items": {
+                      "additionalProperties": false,
+                      "properties": {
+                        "bearing": {
+                          "anyOf": [
+                            {
+                              "type": "number"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "eta_minutes": {
+                          "anyOf": [
+                            {
+                              "maximum": 9007199254740991,
+                              "minimum": -9007199254740991,
+                              "type": "integer"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "eta_status": {
+                          "enum": [
+                            "assigned",
+                            "unassigned"
+                          ],
+                          "type": "string"
+                        },
+                        "id": {
+                          "type": "string"
+                        },
+                        "lat": {
+                          "anyOf": [
+                            {
+                              "type": "number"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "lng": {
+                          "anyOf": [
+                            {
+                              "type": "number"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "next_stop_id": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "route": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        }
+                      },
+                      "required": [
+                        "id",
+                        "route",
+                        "lat",
+                        "lng",
+                        "bearing",
+                        "next_stop_id",
+                        "eta_minutes",
+                        "eta_status"
+                      ],
+                      "type": "object"
+                    },
+                    "type": "array"
+                  },
+                  "zoom": {
+                    "type": "number"
+                  }
+                },
+                "required": [
+                  "center",
+                  "zoom",
+                  "stop",
+                  "vehicles"
+                ],
+                "type": "object"
+              },
+              "type": {
+                "const": "map",
+                "type": "string"
+              }
+            },
+            "required": [
+              "type",
+              "data"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "data": {
+                "additionalProperties": false,
+                "properties": {
+                  "arrivals": {
+                    "items": {
+                      "additionalProperties": false,
+                      "properties": {
+                        "arrival_minutes": {
+                          "anyOf": [
+                            {
+                              "maximum": 9007199254740991,
+                              "minimum": -9007199254740991,
+                              "type": "integer"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "bearing": {
+                          "anyOf": [
+                            {
+                              "type": "number"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "direction": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "lat": {
+                          "anyOf": [
+                            {
+                              "type": "number"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "lng": {
+                          "anyOf": [
+                            {
+                              "type": "number"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "route": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "vehicle_id": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        },
+                        "vehicle_type": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ]
+                        }
+                      },
+                      "required": [
+                        "route",
+                        "direction",
+                        "vehicle_type",
+                        "arrival_minutes",
+                        "vehicle_id",
+                        "lat",
+                        "lng",
+                        "bearing"
+                      ],
+                      "type": "object"
+                    },
+                    "type": "array"
+                  },
+                  "stop": {
+                    "anyOf": [
+                      {
+                        "additionalProperties": false,
+                        "properties": {
+                          "id": {
+                            "type": "string"
+                          },
+                          "lat": {
+                            "anyOf": [
+                              {
+                                "type": "number"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          },
+                          "lng": {
+                            "anyOf": [
+                              {
+                                "type": "number"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          },
+                          "name": {
+                            "anyOf": [
+                              {
+                                "type": "string"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          }
+                        },
+                        "required": [
+                          "id",
+                          "name",
+                          "lat",
+                          "lng"
+                        ],
+                        "type": "object"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  }
+                },
+                "required": [
+                  "stop",
+                  "arrivals"
+                ],
+                "type": "object"
+              },
+              "type": {
+                "const": "arrival_list",
+                "type": "string"
+              }
+            },
+            "required": [
+              "type",
+              "data"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "type": "array"
+    },
+    "view": {
+      "const": "transit_realtime",
+      "type": "string"
+    }
+  },
+  "required": [
+    "view",
+    "data",
+    "ui_blocks"
+  ],
+  "type": "object"
+}

Changed2 schema fields changedApr 29, 2026

changedInput schema / properties / stop_id / anyOf

Previous value: -[
-  {
-    "description": "Numeric municipal stop code (e.g. 707).",
-    "exclusiveMinimum": 0,
-    "maximum": 9007199254740991,
-    "type": "integer"
-  },
-  {
-    "description": "Municipal stop code as digits-only string (e.g. \"707\").",
-    "pattern": "^\\d+$",
-    "type": "string"
-  }
-]New value: +[
+  {
+    "description": "Positive integer stop code (e.g. 707).",
+    "exclusiveMinimum": 0,
+    "maximum": 9007199254740991,
+    "type": "integer"
+  },
+  {
+    "description": "Stop code as a digits-only string (e.g. \"707\").",
+    "pattern": "^\\d+$",
+    "type": "string"
+  }
+]

addedInput schema / properties / stop_id / description

Added value: +"Municipal stop code shown on stop signage (e.g. 707). Accepts a positive integer or an equivalent digit-only string."

First observedApr 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=true and idempotentHint=true, covering the safety profile. The description adds the 'live' nature of the data and the inclusion of vehicle positions, which goes beyond the annotations. It does not contradict them. The bar is lowered by annotations, and the description provides relevant extra context without redundancy.

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?

Two sentences: the first front-loads the core purpose and return contents, the second gives usage routing and input requirement. No fluff, every sentence earns its place. Structure is optimal.

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

Completeness5/5

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

For a single-parameter tool with an output schema and annotations covering safety, the description covers purpose, when to use, alternatives, and required input. Nothing an agent needs to call it correctly is missing; the output schema handles return details.

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%, with a detailed description of stop_id (type, example, and accepted string form). The description only repeats that it is numeric and shown on signage, which is already in the schema. No additional meaning is added, so the baseline 3 applies.

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

Purpose5/5

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

The description states a specific verb ('Returns live arrivals') with a clear resource (stop) and enumerates the returned fields (route, destination, vehicle type, minutes, position). It explicitly distinguishes itself from siblings by positioning itself as the default for arrivals at a specific stop and naming alternatives, so an agent can select it without confusion.

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 gives explicit when-to-use guidance ('default tool when the user asks about arrivals, departures, or the next bus/tram at a specific stop') and when-not-to-use guidance (use search_stops for names, get_stops_around_location for coordinates). This leaves no ambiguity about selection.

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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