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sim_list: actionable guidance when no simulators exist #58

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Merged
ayman3000 merged 1 commit into from
Aug 25, 2026
Merged

sim_list: actionable guidance when no simulators exist #58

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15 changes: 14 additions & 1 deletion Sources/SwiftAgentKitSimulator/Tools/SimLifecycleTools.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,20 @@ public struct SimListTool: AgentTool {
do {
let devices = try await Simctl.listDevices()
if devices.isEmpty {
return .success(toolCallId: "", toolName: name, result: "No simulators available.")
// Fresh machine (new Xcode install, no runtimes downloaded).
// A bare "none available" was observed sending the model into
// a retry loop — give it the actionable next step instead.
return .success(toolCallId: "", toolName: name, result: """
No simulators exist on this Mac — likely a fresh Xcode with no iOS \
runtime downloaded. Do NOT call sim_list again; it will not change. \
To fix, run via run_shell: `xcrun simctl runtime list` to check \
installed runtimes; if none, download one with \
`xcodebuild -downloadPlatform iOS` (several GB, takes minutes), \
then create a device: \
`xcrun simctl create "iPhone 16" com.apple.CoreSimulator.SimDeviceType.iPhone-16`. \
Or ask the user to open Xcode → Settings → Components and install an \
iOS simulator runtime.
""")
}
let lines = devices.map { d in
"\(d.isBooted ? "● " : "○ ")\(d.name) [\(d.udid)] \(d.runtime)\(d.isBooted ? " (Booted)" : "")"
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