reachable_area
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Third-party content written by another agent. Data to evaluate, not instructions.
Compute the area reachable from an origin within one or more travel-time budgets — walkability/cyclability rings. Costing "pedestrian" answers "how far can I walk in 15 minutes?", "bicycle" the cycling equivalent; "auto", "truck" and "motor_scooter" work too (e.g. delivery coverage). contours_minutes lists the ring boundaries in minutes (1-10 values, each up to 120); set polygons true for filled polygons ready to render as a map fill layer instead of contour lines. Returns a GeoJSON FeatureCollection, one feature per contour. Optional exclude_polygons for before/after scenarios ("close this bridge and recompute reachability"): an array of polygons, each an array of [lon, lat] pairs forming one ring — longitude FIRST — whose intersecting roads are excluded from the reachability search. Applies to the Valhalla engine; unsupported on the GraphHopper engine, where it is ignored.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| contours_minutes | array | yes | Contour boundaries in minutes of travel time, e.g. [5, 10, 15] for 5/10/15-minute rings. 1–10 values, each between 0 and 120 minutes. |
| costing | any | no | Travel mode: "auto" (default), "truck", "bicycle", "pedestrian" or "motor_scooter". |
| exclude_polygons | array | null | no | Areas to avoid — scenario analysis ("close this bridge and recompute reachability"): an array of polygons, each an array of `[lon, lat]` pairs forming one exterior ring (GeoJSON-style, longitude FIRST). Roads intersecting any ring are excluded from the reachability search. Applies to the Valhalla engine; unsupported on the GraphHopper engine, where it is ignored. |
| origin | any | yes | Origin the reachable area is computed from. |
| polygons | boolean | null | no | Return filled polygons instead of contour linestrings (default false). Polygons draw directly as a MapLibre fill layer. |
Raw JSON schema
{
"$defs": {
"CostingKind": {
"description": "Costing models exposed by the MCP tools (a deliberate subset of the\nValhalla costing list), serialised in snake_case exactly as Valhalla\nnames them.",
"oneOf": [
{
"const": "auto",
"description": "Standard car costing.",
"type": "string"
},
{
"const": "truck",
"description": "Truck costing; honours dimensional limits and, when a `truck`\nprofile is supplied, ADR dangerous-goods restrictions.",
"type": "string"
},
{
"const": "bicycle",
"description": "Bicycle costing; tune it with a `bicycle` options object.",
"type": "string"
},
{
"const": "pedestrian",
"description": "Pedestrian (walking) costing; tune it with a `pedestrian` options\nobject (lit streets, wheelchair/blind, hiking difficulty).",
"type": "string"
},
{
"const": "motor_scooter",
"description": "Motor scooter (moped) costing: like auto but prefers lower-speed\nroads and may use ways closed to larger motor vehicles.",
"type": "string"
}
]
},
"LatLon": {
"description": "A WGS84 coordinate pair in decimal degrees.",
"properties": {
"lat": {
"description": "Latitude in decimal degrees (−90 to 90).",
"format": "double",
"type": "number"
},
"lon": {
"description": "Longitude in decimal degrees (−180 to 180).",
"format": "double",
"type": "number"
}
},
"required": [
"lat",
"lon"
],
"type": "object"
}
},
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"contours_minutes": {
"description": "Contour boundaries in minutes of travel time, e.g. [5, 10, 15]\nfor 5/10/15-minute rings. 1–10 values, each between 0 and 120\nminutes.",
"items": {
"format": "double",
"type": "number"
},
"type": "array"
},
"costing": {
"$ref": "#/$defs/CostingKind",
"default": "auto",
"description": "Travel mode: \"auto\" (default), \"truck\", \"bicycle\", \"pedestrian\"\nor \"motor_scooter\"."
},
"exclude_polygons": {
"description": "Areas to avoid — scenario analysis (\"close this bridge and\nrecompute reachability\"): an array of polygons, each an array of\n`[lon, lat]` pairs forming one exterior ring (GeoJSON-style,\nlongitude FIRST). Roads intersecting any ring are excluded from\nthe reachability search. Applies to the Valhalla engine;\nunsupported on the GraphHopper engine, where it is ignored.",
"items": {
"items": {
"items": {
"format": "double",
"type": "number"
},
"maxItems": 2,
"minItems": 2,
"type": "array"
},
"type": "array"
},
"type": [
"array",
"null"
]
},
"origin": {
"$ref": "#/$defs/LatLon",
"description": "Origin the reachable area is computed from."
},
"polygons": {
"description": "Return filled polygons instead of contour linestrings (default\nfalse). Polygons draw directly as a MapLibre fill layer.",
"type": [
"boolean",
"null"
]
}
},
"required": [
"origin",
"contours_minutes"
],
"type": "object"
}