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OverviewDiscussionsAdmin

Plan public transport

plan_public_transport
Read-onlyIdempotent

Plan public transport with fares, walking legs, transfers, and boarding instructions: trotro in Ghana, or buses leaving now in England, Scotland and Wales. Bus times come from published timetables, not live tracking.

Input Schema

NameRequiredDescriptionDefault
pickupYesPickup coordinates
destinationYesDestination coordinates

Output Schema

NameRequiredDescriptionDefault
routesYes
networkYestrotro in Ghana, or bus in Great Britain
completeYes
skipNoteNo
routeCountsYes
routesRequiringRideConnectionYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • changedOutput schema / properties / routes / items / properties / steps / items / oneOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "distanceMeters": {
-        "type": "number"
-      },
-      "durationMinutes": {
-        "type": "number"
-      },
-      "instruction": {
-        "type": "string"
-      },
-      "roadCrossings": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "confidence": {
-              "const": "high",
-              "type": "string"
-            },
-            "distanceFromStartMeters": {
-              "minimum": 0,
-              "type": "number"
-            },
-            "evidence": {
-              "enum": [
-                "mapped-crossing",
-                "short-road-traversal"
-              ],
-              "type": "string"
-            },
-            "location": {
-              "additionalProperties": false,
-              "properties": {
-                "lat": {
-                  "description": "Latitude in decimal degrees",
-                  "maximum": 90,
-                  "minimum": -90,
-                  "type": "number"
-                },
-                "lng": {
-                  "description": "Longitude in decimal degrees",
-                  "maximum": 180,
-                  "minimum": -180,
-                  "type": "number"
-                }
-              },
-              "required": [
-                "lat",
-                "lng"
-              ],
-              "type": "object"
-            }
-          },
-          "required": [
-            "location",
-            "distanceFromStartMeters",
-            "evidence",
-            "confidence"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "roadCrossingsTotal": {
-        "maximum": 9007199254740991,
-        "minimum": 0,
-        "type": "integer"
-      },
-      "roadCrossingsTruncated": {
-        "type": "boolean"
-      },
-      "toStop": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "lat": {
-                "type": "number"
-              },
-              "lng": {
-                "type": "number"
-              },
-              "name": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "type": {
-        "const": "walk",
-        "type": "string"
-      },
-      "unverifiedEndpointMeters": {
-        "minimum": 0,
-        "type": "number"
-      }
-    },
-    "required": [
-      "type",
-      "toStop"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "alightAt": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "lat": {
-                "type": "number"
-              },
-              "lng": {
-                "type": "number"
-              },
-              "name": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "alightingRoadCrossing": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "confidence": {
-                "const": "high",
-                "type": "string"
-              },
-              "status": {
-                "const": "required",
-                "type": "string"
-              }
-            },
-            "required": [
-              "status",
-              "confidence"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "status": {
-                "const": "unknown",
-                "type": "string"
-              }
-            },
-            "required": [
-              "status"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "boardAt": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "lat": {
-                "type": "number"
-              },
-              "lng": {
-                "type": "number"
-              },
-              "name": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "boardingRoadCrossing": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "confidence": {
-                "const": "high",
-                "type": "string"
-              },
-              "status": {
-                "const": "required",
-                "type": "string"
-              }
-            },
-            "required": [
-              "status",
-              "confidence"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "status": {
-                "const": "unknown",
-                "type": "string"
-              }
-            },
-            "required": [
-              "status"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "currency": {
-        "type": "string"
-      },
-      "fare": {
-        "type": "number"
-      },
-      "instruction": {
-        "type": "string"
-      },
-      "route": {
-        "type": "string"
-      },
-      "stopCount": {
-        "type": "number"
-      },
-      "toward": {
-        "type": "string"
-      },
-      "type": {
-        "const": "ride",
-        "type": "string"
-      }
-    },
-    "required": [
-      "type",
-      "boardAt",
-      "alightAt"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "directDistanceOnly": {
+        "const": true,
+        "description": "The walk could not be mapped, so its distance is the straight-line distance.",
+        "type": "boolean"
+      },
+      "distanceMeters": {
+        "type": "number"
+      },
+      "durationMinutes": {
+        "type": "number"
+      },
+      "instruction": {
+        "type": "string"
+      },
+      "roadCrossings": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "confidence": {
+              "const": "high",
+              "type": "string"
+            },
+            "distanceFromStartMeters": {
+              "minimum": 0,
+              "type": "number"
+            },
+            "evidence": {
+              "enum": [
+                "mapped-crossing",
+                "short-road-traversal"
+              ],
+              "type": "string"
+            },
+            "location": {
+              "additionalProperties": false,
+              "properties": {
+                "lat": {
+                  "description": "Latitude in decimal degrees",
+                  "maximum": 90,
+                  "minimum": -90,
+                  "type": "number"
+                },
+                "lng": {
+                  "description": "Longitude in decimal degrees",
+                  "maximum": 180,
+                  "minimum": -180,
+                  "type": "number"
+                }
+              },
+              "required": [
+                "lat",
+                "lng"
+              ],
+              "type": "object"
+            }
+          },
+          "required": [
+            "location",
+            "distanceFromStartMeters",
+            "evidence",
+            "confidence"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "roadCrossingsTotal": {
+        "maximum": 9007199254740991,
+        "minimum": 0,
+        "type": "integer"
+      },
+      "roadCrossingsTruncated": {
+        "type": "boolean"
+      },
+      "toStop": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "lat": {
+                "type": "number"
+              },
+              "lng": {
+                "type": "number"
+              },
+              "name": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "type": {
+        "const": "walk",
+        "type": "string"
+      },
+      "unverifiedEndpointMeters": {
+        "minimum": 0,
+        "type": "number"
+      }
+    },
+    "required": [
+      "type",
+      "toStop"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "alightAt": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "lat": {
+                "type": "number"
+              },
+              "lng": {
+                "type": "number"
+              },
+              "name": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "alightingRoadCrossing": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "confidence": {
+                "const": "high",
+                "type": "string"
+              },
+              "status": {
+                "const": "required",
+                "type": "string"
+              }
+            },
+            "required": [
+              "status",
+              "confidence"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "status": {
+                "const": "unknown",
+                "type": "string"
+              }
+            },
+            "required": [
+              "status"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "boardAt": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "lat": {
+                "type": "number"
+              },
+              "lng": {
+                "type": "number"
+              },
+              "name": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "boardingRoadCrossing": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "confidence": {
+                "const": "high",
+                "type": "string"
+              },
+              "status": {
+                "const": "required",
+                "type": "string"
+              }
+            },
+            "required": [
+              "status",
+              "confidence"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "status": {
+                "const": "unknown",
+                "type": "string"
+              }
+            },
+            "required": [
+              "status"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "currency": {
+        "type": "string"
+      },
+      "fare": {
+        "type": "number"
+      },
+      "instruction": {
+        "type": "string"
+      },
+      "route": {
+        "type": "string"
+      },
+      "stopCount": {
+        "type": "number"
+      },
+      "toward": {
+        "type": "string"
+      },
+      "type": {
+        "const": "ride",
+        "type": "string"
+      }
+    },
+    "required": [
+      "type",
+      "boardAt",
+      "alightAt"
+    ],
+    "type": "object"
+  }
+]
    • changedOutput schema / properties / routesRequiringRideConnection / items / properties / steps / items / oneOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "distanceMeters": {
-        "type": "number"
-      },
-      "durationMinutes": {
-        "type": "number"
-      },
-      "instruction": {
-        "type": "string"
-      },
-      "roadCrossings": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "confidence": {
-              "const": "high",
-              "type": "string"
-            },
-            "distanceFromStartMeters": {
-              "minimum": 0,
-              "type": "number"
-            },
-            "evidence": {
-              "enum": [
-                "mapped-crossing",
-                "short-road-traversal"
-              ],
-              "type": "string"
-            },
-            "location": {
-              "additionalProperties": false,
-              "properties": {
-                "lat": {
-                  "description": "Latitude in decimal degrees",
-                  "maximum": 90,
-                  "minimum": -90,
-                  "type": "number"
-                },
-                "lng": {
-                  "description": "Longitude in decimal degrees",
-                  "maximum": 180,
-                  "minimum": -180,
-                  "type": "number"
-                }
-              },
-              "required": [
-                "lat",
-                "lng"
-              ],
-              "type": "object"
-            }
-          },
-          "required": [
-            "location",
-            "distanceFromStartMeters",
-            "evidence",
-            "confidence"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "roadCrossingsTotal": {
-        "maximum": 9007199254740991,
-        "minimum": 0,
-        "type": "integer"
-      },
-      "roadCrossingsTruncated": {
-        "type": "boolean"
-      },
-      "toStop": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "lat": {
-                "type": "number"
-              },
-              "lng": {
-                "type": "number"
-              },
-              "name": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "type": {
-        "const": "walk",
-        "type": "string"
-      },
-      "unverifiedEndpointMeters": {
-        "minimum": 0,
-        "type": "number"
-      }
-    },
-    "required": [
-      "type",
-      "toStop"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "alightAt": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "lat": {
-                "type": "number"
-              },
-              "lng": {
-                "type": "number"
-              },
-              "name": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "alightingRoadCrossing": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "confidence": {
-                "const": "high",
-                "type": "string"
-              },
-              "status": {
-                "const": "required",
-                "type": "string"
-              }
-            },
-            "required": [
-              "status",
-              "confidence"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "status": {
-                "const": "unknown",
-                "type": "string"
-              }
-            },
-            "required": [
-              "status"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "boardAt": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "lat": {
-                "type": "number"
-              },
-              "lng": {
-                "type": "number"
-              },
-              "name": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "boardingRoadCrossing": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "confidence": {
-                "const": "high",
-                "type": "string"
-              },
-              "status": {
-                "const": "required",
-                "type": "string"
-              }
-            },
-            "required": [
-              "status",
-              "confidence"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "status": {
-                "const": "unknown",
-                "type": "string"
-              }
-            },
-            "required": [
-              "status"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "currency": {
-        "type": "string"
-      },
-      "fare": {
-        "type": "number"
-      },
-      "instruction": {
-        "type": "string"
-      },
-      "route": {
-        "type": "string"
-      },
-      "stopCount": {
-        "type": "number"
-      },
-      "toward": {
-        "type": "string"
-      },
-      "type": {
-        "const": "ride",
-        "type": "string"
-      }
-    },
-    "required": [
-      "type",
-      "boardAt",
-      "alightAt"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "directDistanceOnly": {
+        "const": true,
+        "description": "The walk could not be mapped, so its distance is the straight-line distance.",
+        "type": "boolean"
+      },
+      "distanceMeters": {
+        "type": "number"
+      },
+      "durationMinutes": {
+        "type": "number"
+      },
+      "instruction": {
+        "type": "string"
+      },
+      "roadCrossings": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "confidence": {
+              "const": "high",
+              "type": "string"
+            },
+            "distanceFromStartMeters": {
+              "minimum": 0,
+              "type": "number"
+            },
+            "evidence": {
+              "enum": [
+                "mapped-crossing",
+                "short-road-traversal"
+              ],
+              "type": "string"
+            },
+            "location": {
+              "additionalProperties": false,
+              "properties": {
+                "lat": {
+                  "description": "Latitude in decimal degrees",
+                  "maximum": 90,
+                  "minimum": -90,
+                  "type": "number"
+                },
+                "lng": {
+                  "description": "Longitude in decimal degrees",
+                  "maximum": 180,
+                  "minimum": -180,
+                  "type": "number"
+                }
+              },
+              "required": [
+                "lat",
+                "lng"
+              ],
+              "type": "object"
+            }
+          },
+          "required": [
+            "location",
+            "distanceFromStartMeters",
+            "evidence",
+            "confidence"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "roadCrossingsTotal": {
+        "maximum": 9007199254740991,
+        "minimum": 0,
+        "type": "integer"
+      },
+      "roadCrossingsTruncated": {
+        "type": "boolean"
+      },
+      "toStop": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "lat": {
+                "type": "number"
+              },
+              "lng": {
+                "type": "number"
+              },
+              "name": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "type": {
+        "const": "walk",
+        "type": "string"
+      },
+      "unverifiedEndpointMeters": {
+        "minimum": 0,
+        "type": "number"
+      }
+    },
+    "required": [
+      "type",
+      "toStop"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "alightAt": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "lat": {
+                "type": "number"
+              },
+              "lng": {
+                "type": "number"
+              },
+              "name": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "alightingRoadCrossing": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "confidence": {
+                "const": "high",
+                "type": "string"
+              },
+              "status": {
+                "const": "required",
+                "type": "string"
+              }
+            },
+            "required": [
+              "status",
+              "confidence"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "status": {
+                "const": "unknown",
+                "type": "string"
+              }
+            },
+            "required": [
+              "status"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "boardAt": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "lat": {
+                "type": "number"
+              },
+              "lng": {
+                "type": "number"
+              },
+              "name": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "boardingRoadCrossing": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "confidence": {
+                "const": "high",
+                "type": "string"
+              },
+              "status": {
+                "const": "required",
+                "type": "string"
+              }
+            },
+            "required": [
+              "status",
+              "confidence"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "status": {
+                "const": "unknown",
+                "type": "string"
+              }
+            },
+            "required": [
+              "status"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "currency": {
+        "type": "string"
+      },
+      "fare": {
+        "type": "number"
+      },
+      "instruction": {
+        "type": "string"
+      },
+      "route": {
+        "type": "string"
+      },
+      "stopCount": {
+        "type": "number"
+      },
+      "toward": {
+        "type": "string"
+      },
+      "type": {
+        "const": "ride",
+        "type": "string"
+      }
+    },
+    "required": [
+      "type",
+      "boardAt",
+      "alightAt"
+    ],
+    "type": "object"
+  }
+]
  2. Added

TDQS

A3.8/5.0
Behavior4/5

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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so the safety profile is covered. The description adds genuinely new behavioral context beyond them: the result includes fares and walking legs, and critically 'Bus times come from published timetables, not live tracking' — a data-freshness caveat an agent would otherwise get wrong. It doesn't discuss failure modes outside covered regions, hence not a 5.

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?

A single sentence, front-loaded with the action, then a compact enumeration of outputs and coverage, closed by the most decision-relevant caveat. No filler and no repetition of schema or annotation content.

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?

An output schema exists, so return values needn't be spelled out, and the description still adds freshness and coverage context. What's missing is the selection boundary against plan_trotro_route and any statement about what happens for pickups outside the four named regions — material for a 2-parameter planning tool with open-world behavior.

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 nested lat/lng objects carry descriptions and bounds, so the schema does the heavy lifting. The description adds nothing about the coordinates (e.g. that pickup must be near a served stop or that regions are inferred from them). Baseline 3 is correct here.

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

Purpose4/5

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

States a specific verb and resource ('Plan public transport') and enumerates the outputs an agent gets back: fares, walking legs, transfers, boarding instructions. It also scopes coverage geographically (Ghana trotro; buses in England, Scotland, Wales), which meaningfully narrows what the tool does. It stops short of differentiating itself from the overlapping sibling plan_trotro_route, which keeps it off a 5.

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?

Usage is implied rather than stated: use this for trip planning on public transport in the named regions. There is no explicit 'use this when' or 'use X instead' guidance, and notably no routing away from plan_trotro_route or plan_trip despite clear topical overlap. An agent must infer the boundary itself.

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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