Straight-line (great-circle) distance matrix from coordinates. FREE.
Typical input {"points": [{"id": "depot", "lat": 51.5, "lon": -0.12},
{"id": "A", "lat": 51.52, "lon": -0.1}]} returns {"matrix": [[0,
2.6], [2.6, 0]], "unit": "km", "kind": "straight-line (haversine), not
road distance"}. Use when you have no road matrix and a straight-line
approximation is acceptable, or to sanity-check one. Not road routing:
real driving distances are longer and the difference is not uniform. Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "points must be a list of at least two <value> objects"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.
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