I have a fairly basic prompt I've created that parses a list of locations out of a string. I've then created a tool, which for these locations, finds their latitude/longitude on a map and populates that in the response.
However, I cannot get the language model session to see/use my tool.
I have code like this passing the tool to my prompt:
class Parser {
func populate(locations: String, latitude: Double, longitude: Double) async {
let findLatLonTool = FindLatLonTool(latitude: latitude, longitude: longitude)
let session = LanguageModelSession(tools: [findLatLonTool]) {
"""
A prompt that populates a model with a list of locations.
"""
"""
Use the findLatLon tool to populate the latitude and longitude for the name of each location.
"""
}
let stream = session.streamResponse(to: "Parse these locations: \(locations)", generating: ParsedLocations.self)
let locationsModel = LocationsModels();
do {
for try await partialParsedLocations in stream {
locationsModel.parsedLocations = partialParsedLocations.content
}
} catch {
print("Error parsing")
}
}
}
And then the tool that looks something like this:
import Foundation
import FoundationModels
import MapKit
struct FindLatLonTool: Tool {
typealias Output = GeneratedContent
let name = "findLatLon"
let description = "Find the latitude / longitude of a location for a place name."
let latitude: Double
let longitude: Double
@Generable
struct Arguments {
@Guide(description: "This is the location name to look up.")
let locationName: String
}
func call(arguments: Arguments) async throws -> GeneratedContent {
let request = MKLocalSearch.Request()
request.naturalLanguageQuery = arguments.locationName
request.region = MKCoordinateRegion(
center: CLLocationCoordinate2D(latitude: latitude, longitude: longitude),
latitudinalMeters: 1_000_000,
longitudinalMeters: 1_000_000
)
let search = MKLocalSearch(request: request)
let coordinate = try await search.start().mapItems.first?.location.coordinate
if let coordinate = coordinate {
return GeneratedContent(
LatLonModel(latitude: coordinate.latitude, longitude: coordinate.longitude)
)
}
return GeneratedContent("Location was not found - no latitude / longitude is available.")
}
}
But trying a bunch of different prompts has not triggered the tool - instead, what appear to be totally random locations are filled in my resulting model and at no point does a breakpoint hit my tool code.
Has anybody successfully gotten a tool to be called?
