refactor(ai): remove default command and enforce strict window context

- Remove `/ai set default-provider` command and related autocomplete logic
- Remove global `wins_get_ai()` window accessor function
- Enforce strict requirement that `/ai model`, `/ai switch`, `/ai models`, and `/ai clear` commands must be executed from within an active AI chat window
- Update `/ai start` to require `<provider>` argument

BREAKING CHANGE: `/ai model`, `/ai switch`, `/ai models`, and `/ai clear` commands now require an active AI window context. The `/ai set default-provider` command has been removed.

src/command/cmd_ac.c

@@ -1192,7 +1192,6 @@ cmd_ac_init(void)
 
     autocomplete_add_unsorted(ai_set_subcommands_ac, "provider", FALSE);
     autocomplete_add_unsorted(ai_set_subcommands_ac, "token", FALSE);
-    autocomplete_add_unsorted(ai_set_subcommands_ac, "default-provider", FALSE);
     autocomplete_add_unsorted(ai_set_subcommands_ac, "default-model", FALSE);
     autocomplete_add_unsorted(ai_set_subcommands_ac, "custom", FALSE);
 
@@ -4511,12 +4510,6 @@ _ai_autocomplete(ProfWin* window, const char* const input, gboolean previous)
         return result;
     }
 
-    // /ai set default-provider <provider> - autocomplete provider names
-    result = autocomplete_param_with_func(input, "/ai set default-provider", ai_providers_find, previous, NULL);
-    if (result) {
-        return result;
-    }
-
     // /ai set default-model <provider> <model> - autocomplete provider names
     result = autocomplete_param_with_func(input, "/ai set default-model", ai_providers_find, previous, NULL);
     if (result) {
@@ -4584,7 +4577,7 @@ _ai_autocomplete(ProfWin* window, const char* const input, gboolean previous)
     }
 
     // /ai switch <model> - autocomplete model names from current session's provider
-    ProfAiWin* aiwin = (window && window->type == WIN_AI) ? (ProfAiWin*)window : wins_get_ai();
+    ProfAiWin* aiwin = (window && window->type == WIN_AI) ? (ProfAiWin*)window : NULL;
     result = autocomplete_param_with_func(input, "/ai switch", ai_models_find, previous, aiwin);
     if (result) {
         return result;

src/command/cmd_defs.c

@@ -2804,7 +2804,6 @@ static const struct cmd_t command_defs[] = {
               "/ai",
               "/ai set provider <name> <url>",
               "/ai set token <provider> <token>",
-              "/ai set default-provider <provider>",
               "/ai set default-model <provider> <model>",
               "/ai set custom <provider> <setting> <value>",
               "/ai remove provider <name>",
@@ -2823,14 +2822,12 @@ static const struct cmd_t command_defs[] = {
               { "", "Display current AI settings and configured providers" },
               { "set provider <name> <url>", "Add or update a provider with custom API endpoint" },
               { "set token <provider> <token>", "Set API token for a provider (e.g., openai, perplexity)" },
-              { "set default-provider <provider>", "Set global default provider for /ai start" },
               { "set default-model <provider> <model>", "Set default model for a provider" },
               { "set custom <provider> <setting> <value>", "Set provider-level setting (e.g., tools, search)" },
               { "remove provider <name>", "Remove a custom provider" },
               { "providers", "List configured providers with full details" },
-              { "start [<provider>] [<model>]", "Start new AI chat (space-separated, uses defaults if omitted)" },
+              { "start <provider> [<model>]", "Start new AI chat (space-separated, uses defaults if omitted)" },
               { "switch <provider> [<model>]", "Switch to different provider (and optionally model)" },
-              { "switch <model>", "Change model in current session (keeps provider)" },
               { "models <provider>", "Fetch and display available models for provider" },
               { "clear", "Clear current chat history" })
       CMD_EXAMPLES(
@@ -2838,7 +2835,6 @@ static const struct cmd_t command_defs[] = {
               "/ai set token openai sk-xxx",
               "/ai set token perplexity pplx-xxx",
               "/ai set provider custom https://my-api.com/v1/chat/completions",
-              "/ai set default-provider perplexity",
               "/ai set default-model perplexity sonar",
               "/ai set custom perplexity tools enabled",
               "/ai remove provider custom",

src/command/cmd_funcs.c

@@ -10876,23 +10876,6 @@ cmd_ai_set(ProfWin* window, const char* const command, gchar** args)
         cons_show("Setting '%s' for provider '%s' set to: %s", args[3], args[2], args[4]);
         cons_show("");
         return TRUE;
-    } else if (g_strcmp0(args[1], "default-provider") == 0) {
-        // /ai set default-provider <provider>
-        if (g_strv_length(args) < 3) {
-            cons_bad_cmd_usage(command);
-            return TRUE;
-        }
-        const gchar* provider_name = args[2];
-        AIProvider* provider = ai_get_provider(provider_name);
-        if (!provider) {
-            cons_show_error("Provider '%s' not found. Use '/ai set provider %s <url>' to add it.",
-                            provider_name, provider_name);
-            return TRUE;
-        }
-        prefs_set_string(PREF_AI_PROVIDER, provider_name);
-        cons_show("Default provider set to: %s", provider_name);
-        cons_show("");
-        return TRUE;
     }
 
     cons_bad_cmd_usage(command);
@@ -11024,12 +11007,12 @@ cmd_ai_model(ProfWin* window, const char* const command, gchar** args)
 
     const gchar* model = args[1];
 
-    // Get current AI window
+    // Must be in an AI window to use this command
-    ProfAiWin* aiwin = (window && window->type == WIN_AI) ? (ProfAiWin*)window : wins_get_ai();
+    if (!window || window->type != WIN_AI) {
-    if (!aiwin) {
+        cons_show_error("Must be in an AI chat window to use this command.");
-        cons_show("No active AI chat window. Use '/ai start' first.");
         return TRUE;
     }
+    ProfAiWin* aiwin = (ProfAiWin*)window;
 
     assert(aiwin->memcheck == PROFAIWIN_MEMCHECK);
 
@@ -11055,12 +11038,12 @@ cmd_ai_switch(ProfWin* window, const char* const command, gchar** args)
         return TRUE;
     }
 
-    // Get current AI window
+    // Must be in an AI window to use this command
-    ProfAiWin* aiwin = (window && window->type == WIN_AI) ? (ProfAiWin*)window : wins_get_ai();
+    if (!window || window->type != WIN_AI) {
-    if (!aiwin) {
+        cons_show_error("Must be in an AI chat window to use this command.");
-        cons_show("No active AI chat window. Use '/ai start' first.");
         return TRUE;
     }
+    ProfAiWin* aiwin = (ProfAiWin*)window;
 
     assert(aiwin->memcheck == PROFAIWIN_MEMCHECK);
 
@@ -11158,7 +11141,11 @@ cmd_ai_models(ProfWin* window, const char* const command, gchar** args)
         cons_show("Use '/ai models %s' to fetch fresh models from the API.", provider_name);
     } else {
         // Default: fetch fresh models from API
-        ProfAiWin* aiwin = (window && window->type == WIN_AI) ? (ProfAiWin*)window : wins_get_ai();
+        if (!window || window->type != WIN_AI) {
+            cons_show_error("Must be in an AI chat window to fetch models.");
+            return TRUE;
+        }
+        ProfAiWin* aiwin = (ProfAiWin*)window;
         ai_fetch_models(provider_name, aiwin);
     }
 
@@ -11169,18 +11156,20 @@ gboolean
 cmd_ai_clear(ProfWin* window, const char* const command, gchar** args)
 {
     // /ai clear
-    ProfAiWin* aiwin = (window && window->type == WIN_AI) ? (ProfAiWin*)window : wins_get_ai();
+    // Must be in an AI window to use this command
-
+    if (!window || window->type != WIN_AI) {
-    if (aiwin) {
+        cons_show_error("Must be in an AI chat window to use this command.");
-        assert(aiwin->memcheck == PROFAIWIN_MEMCHECK);
+        return TRUE;
-        if (aiwin->session) {
-            ai_session_clear_history(aiwin->session);
-        }
-        cons_show("Chat history cleared.");
-    } else {
-        cons_show("No active AI chat window to clear.");
     }
-    cons_show("");
+    ProfAiWin* aiwin = (ProfAiWin*)window;
+
+    assert(aiwin->memcheck == PROFAIWIN_MEMCHECK);
+    if (aiwin->session) {
+        ai_session_clear_history(aiwin->session);
+    }
+
+    win_clear(window);
+    cons_show("AI Chat history cleared.");
     return TRUE;
 }
 

src/ui/window_list.c

@@ -867,24 +867,6 @@ wins_get_prune_wins(void)
     return result;
 }
 
-ProfAiWin*
-wins_get_ai(void)
-{
-    GList* curr = values;
-
-    while (curr) {
-        ProfWin* window = curr->data;
-        if (window->type == WIN_AI) {
-            ProfAiWin* aiwin = (ProfAiWin*)window;
-            assert(aiwin->memcheck == PROFAIWIN_MEMCHECK);
-            return aiwin;
-        }
-        curr = g_list_next(curr);
-    }
-
-    return NULL;
-}
-
 gboolean
 wins_ai_exists(ProfAiWin* const aiwin)
 {

src/ui/window_list.h

@@ -63,7 +63,6 @@ ProfPrivateWin* wins_get_private(const char* const fulljid);
 ProfPluginWin* wins_get_plugin(const char* const tag);
 ProfXMLWin* wins_get_xmlconsole(void);
 ProfVcardWin* wins_get_vcard(void);
-ProfAiWin* wins_get_ai(void);
 gboolean wins_ai_exists(ProfAiWin* const aiwin);
 
 void wins_close_plugin(char* tag);