.gitignore

@@ -31,6 +31,9 @@ DerivedData/
 *.dSYM.zip
 *.dSYM
 
+## Code coverage
+*.profraw
+
 ## Playgrounds
 timeline.xctimeline
 playground.xcworkspace

oAI/ViewModels/ChatViewModel.swift

@@ -151,8 +151,14 @@ Don't narrate future actions ("Let me...") - just use the tools.
 
     /// Builds the complete system prompt by combining default + conditional sections + custom
     private var effectiveSystemPrompt: String {
+        // Tool guidance, the user's custom prompt, and Agent Skills all generally assume tool
+        // access and can easily blow past small context windows (e.g. Apple's on-device 4K
+        // limit) — skip all three for tool-incapable models.
+        let modelSupportsTools = selectedModel?.capabilities.tools ?? true
+
         // Check if user wants to replace the default prompt entirely (BYOP mode)
-        if settings.customPromptMode == .replace,
+        if modelSupportsTools,
+           settings.customPromptMode == .replace,
            let customPrompt = settings.systemPrompt,
            !customPrompt.isEmpty {
             // BYOP: Use ONLY the custom prompt
@@ -170,29 +176,32 @@ Don't narrate future actions ("Let me...") - just use the tools.
         }
 
         // Add tool-specific guidelines if MCP is enabled (tools are available)
-        if mcpEnabled {
+        if mcpEnabled && modelSupportsTools {
             prompt += toolUsageGuidelines
         }
 
         // Append custom prompt if in append mode and custom prompt exists
-        if settings.customPromptMode == .append,
+        if modelSupportsTools,
+           settings.customPromptMode == .append,
            let customPrompt = settings.systemPrompt,
            !customPrompt.isEmpty {
             prompt += "\n\n---\n\nAdditional Instructions:\n" + customPrompt
         }
 
         // Append active agent skills (SKILL.md-style behavioral instructions)
-        let activeSkills = settings.agentSkills.filter { $0.isActive }
-        if !activeSkills.isEmpty {
-            prompt += "\n\n---\n\n## Installed Skills\n\nThe following skills are active. Apply them when relevant:\n\n"
-            for skill in activeSkills {
-                prompt += "### \(skill.name)\n\n\(skill.content)\n\n"
-                let files = AgentSkillFilesService.shared.readTextFiles(for: skill.id)
-                if !files.isEmpty {
-                    prompt += "**Skill Data Files:**\n\n"
-                    for (name, content) in files {
-                        let ext = URL(fileURLWithPath: name).pathExtension.lowercased()
-                        prompt += "**\(name):**\n```\(ext)\n\(content)\n```\n\n"
+        if modelSupportsTools {
+            let activeSkills = settings.agentSkills.filter { $0.isActive }
+            if !activeSkills.isEmpty {
+                prompt += "\n\n---\n\n## Installed Skills\n\nThe following skills are active. Apply them when relevant:\n\n"
+                for skill in activeSkills {
+                    prompt += "### \(skill.name)\n\n\(skill.content)\n\n"
+                    let files = AgentSkillFilesService.shared.readTextFiles(for: skill.id)
+                    if !files.isEmpty {
+                        prompt += "**Skill Data Files:**\n\n"
+                        for (name, content) in files {
+                            let ext = URL(fileURLWithPath: name).pathExtension.lowercased()
+                            prompt += "**\(name):**\n```\(ext)\n\(content)\n```\n\n"
+                        }
                     }
                 }
             }