Propagate parent tab's project folder to spawned script tabs

openScriptTab and createMainTab now inherit the project folder from
the currently selected tab instead of always using the global
self.projectFolder. Fixes agent scripts on custom tabs using the
wrong project folder.

Author: macOS26

Agent/AgentViewModel/Features/ScriptTabs.swift

@@ -13,8 +13,10 @@ extension AgentViewModel {
         {
             tab.parentTabId = parent.id
         }
-        // Inherit project folder from current context (resolve to directory, not file)
-        tab.projectFolder = Self.resolvedWorkingDirectory(self.projectFolder)
+        // Inherit project folder from the currently selected tab (parent), falling back to global
+        let parentFolder = selectedTabId.flatMap { self.tab(for: $0) }?.projectFolder ?? ""
+        let sourceFolder = parentFolder.isEmpty ? self.projectFolder : parentFolder
+        tab.projectFolder = Self.resolvedWorkingDirectory(sourceFolder)
         scriptTabs.append(tab)
         if selectTab { selectedTabId = tab.id }
         persistScriptTabs()
@@ -32,8 +34,10 @@ extension AgentViewModel {
             numberedConfig.displayName = "\(baseName) \(existingCount + 1)"
         }
         let tab = ScriptTab(llmConfig: numberedConfig)
-        // Inherit project folder from main tab (resolve to directory, not file)
-        tab.projectFolder = Self.resolvedWorkingDirectory(self.projectFolder)
+        // Inherit project folder from the currently selected tab, falling back to global
+        let parentFolder = selectedTabId.flatMap { self.tab(for: $0) }?.projectFolder ?? ""
+        let sourceFolder = parentFolder.isEmpty ? self.projectFolder : parentFolder
+        tab.projectFolder = Self.resolvedWorkingDirectory(sourceFolder)
         scriptTabs.append(tab)
         selectedTabId = tab.id
         persistScriptTabs()

Agent/AgentViewModel/NativeToolHandlers/NTH-AgentScript.swift

@@ -35,7 +35,6 @@ extension AgentViewModel {
             // Spawn a fresh ScriptTab so the calling main task is not blocked. The script runs in a detached Task and
             // streams output to the spawned tab; this handler returns immediately.
             let spawnedTab = openScriptTab(scriptName: scriptName, selectTab: false)
-            spawnedTab.projectFolder = projectFolder
             spawnedTab.isRunning = true
             spawnedTab.appendLog("🦾 Spawned from main task")
             spawnedTab.flush()

Agent/AgentViewModel/TabHandlers/AgentScript.swift

@@ -166,8 +166,7 @@ extension AgentViewModel {
             // Spawn a fresh ScriptTab for the run so the calling LLM tab is not blocked. The script runs in a detached
             // Task and streams output to the spawned tab; the calling tool returns immediately.
             let spawnedTab = openScriptTab(scriptName: scriptName, selectTab: false)
-            // Inherit caller's project folder explicitly (openScriptTab uses self.projectFolder, which may not match
-            // the calling tab when tabs have diverged).
+            // Inherit caller's project folder explicitly (the calling tab may not be the selected tab).
             spawnedTab.projectFolder = tab.projectFolder
             spawnedTab.isRunning = true
             spawnedTab.appendLog("🦾 Spawned from \(tab.scriptName)")