providers: add teamorouter; pick the first /models id when no default model

src/main.c

@@ -20,7 +20,8 @@
 static void usage(const char *argv0) {
   fprintf(stderr,
           "Usage: %s [options]        (works in the current directory)\n"
-          "  -P, --provider NAME   minimax | deepseek | openai (last used)\n"
+          "  -P, --provider NAME   minimax | deepseek | openai | teamorouter\n"
+          "                        (last used)\n"
           "  -m, --model NAME      model (last used for the provider)\n"
           "  -e, --effort LEVEL    low | medium | high | max (last used)\n"
           "  -w, --workspace DIR   project directory (default: current)\n"
@@ -539,6 +540,20 @@ int main(int argc, char **argv) {
     curl_global_cleanup();
     return 1;
   }
+  /* Router presets have no fixed model: take the first one the API lists
+   * (the TUI does the same after its /models probe). */
+  if (!cfg.model[0] && cfg.headless) {
+    char ids[1][128], err[256] = "";
+    if (cst_llm_list_models(cfg.api_base, cfg.api_key, ids, 1, err,
+                            sizeof(err)) > 0) {
+      snprintf(cfg.model, sizeof(cfg.model), "%s", ids[0]);
+    } else {
+      fprintf(stderr, "no model for %s: pass --model (%s)\n", cfg.provider,
+              err[0] ? err : "the API listed none");
+      curl_global_cleanup();
+      return 1;
+    }
+  }
 
   fprintf(stderr,
           "using %s model=%s effort=%s protocol=%s tools=%s max_steps=%d\n",

src/models.c

@@ -11,6 +11,9 @@ static const cst_provider_t PROVIDERS[] = {
     {"deepseek", "https://api.deepseek.com/v1", "deepseek-flash",
      "DEEPSEEK_API_KEY"},
     {"openai", "https://api.openai.com/v1", "gpt-4.1-mini", "OPENAI_API_KEY"},
+    /* Router: no fixed model; the first id from GET /models is picked. */
+    {"teamorouter", "https://api.teamorouter.com/v1", "",
+     "TEAMOROUTER_API_KEY"},
 };
 
 const cst_provider_t *cst_provider_find(const char *name) {
@@ -102,6 +105,10 @@ long cst_model_context_tokens(const char *model) {
            {"o3", 200000},       {"o4", 200000},      {"claude", 200000},
            {"qwen", 131072},     {"glm", 128000},     {"kimi", 131072}};
   if (model) {
+    /* routers name models "vendor/model" */
+    const char *slash = strrchr(model, '/');
+    if (slash && slash[1])
+      model = slash + 1;
     for (size_t i = 0; i < sizeof(T) / sizeof(T[0]); i++) {
       if (strncmp(model, T[i].prefix, strlen(T[i].prefix)) == 0)
         return T[i].tokens;

src/tui.c

@@ -3821,7 +3821,7 @@ static int secret_input_run(tui_t *t, const char *title, const char *hint,
  * File-scope so a probe still running when the TUI exits writes nowhere
  * stale. */
 
-#define AM_MAX 64
+#define AM_MAX 512 /* routers list hundreds; the picker filters as you type */
 enum { AM_NONE = 0, AM_RUNNING, AM_OK, AM_FAILED, AM_AUTH };
 
 static pthread_mutex_t g_am_mu = PTHREAD_MUTEX_INITIALIZER;
@@ -3920,15 +3920,23 @@ static int am_models(const char *provider, char out[][128], int max) {
   return n;
 }
 
-/* After a probe: flag a model the API does not list. */
+/* After a probe: flag a model the API does not list; with no model yet
+ * (router presets) take the first one listed. */
 static void am_check_model(tui_t *t) {
-  const cst_agent_config_t *cfg = cst_agent_config(t->agent);
+  cst_agent_config_t *cfg = cst_agent_config_mut(t->agent);
   char msg[400] = "";
+  int picked = 0;
   pthread_mutex_lock(&g_am_mu);
   if (cfg && strcmp(g_am.provider, cfg->provider) == 0) {
     if (g_am.state == AM_AUTH) {
       snprintf(msg, sizeof(msg), "the %s API key was rejected — /key to "
                                  "replace it", cfg->provider);
+    } else if (g_am.state == AM_OK && g_am.n > 0 && !cfg->model[0]) {
+      snprintf(cfg->model, sizeof(cfg->model), "%s", g_am.ids[0]);
+      snprintf(msg, sizeof(msg), "model → %.127s (%d listed by %s) — /model "
+                                 "to change",
+               cfg->model, g_am.n, cfg->provider);
+      picked = 1;
     } else if (g_am.state == AM_OK && g_am.n > 0) {
       int found = 0;
       for (int i = 0; i < g_am.n && !found; i++)
@@ -3939,6 +3947,8 @@ static void am_check_model(tui_t *t) {
     }
   }
   pthread_mutex_unlock(&g_am_mu);
+  if (picked)
+    cst_settings_remember(cfg);
   if (msg[0])
     set_status(t, msg);
 }
@@ -4314,7 +4324,8 @@ static void cmd_provider(tui_t *t, char *arg, int *quit) {
     int cur_idx = 0;
     for (int i = 0; i < n && i < 16; i++) {
       const cst_provider_t *q = cst_provider_at(i);
-      snprintf(items[i], 128, "%-9s %s  (%s)", q->name, q->api_base, q->model);
+      snprintf(items[i], 128, "%-11s %s  (%s)", q->name, q->api_base,
+               q->model[0] ? q->model : "models from API");
       if (strcmp(q->name, cfg->provider) == 0)
         cur_idx = i;
     }
@@ -5409,6 +5420,12 @@ static void request_cancel_ui(tui_t *t) {
 
 static int begin_turn(tui_t *t, char *prompt) {
   prompt_hist_push(t, prompt);
+  if (!cst_agent_config(t->agent)->model[0]) {
+    set_status(t, "no model selected yet — /model to pick one (↑ recalls "
+                  "your message)");
+    free(prompt);
+    return -1;
+  }
   block_t *ub = blocks_push(&t->hist);
   if (ub) {
     ub->kind = BLK_USER;