diff --git a/src/cli.ts b/src/cli.ts
index 4972122..7999684 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -163,18 +163,18 @@ async function main(): Promise<number> {
   }
 
   const baseUrl =
-    values["base-url"] ?? process.env.CLAUDELY_BASE_URL ?? config.baseUrl ?? provider.defaultBaseUrl();
-  const token = values.token ?? process.env.CLAUDELY_TOKEN ?? config.token ?? provider.defaultToken;
+    values["base-url"] ?? process.env.CLAUDELY_BASE_URL ?? (config.baseUrl || undefined) ?? provider.defaultBaseUrl();
+  const token = values.token ?? process.env.CLAUDELY_TOKEN ?? (config.token || undefined) ?? provider.defaultToken;
 
   if (!baseUrl) {
     console.error(
-      "claudely: provider 'custom' requires --base-url <url> (or $CLAUDELY_BASE_URL)",
+      `claudely: provider '${providerName}' requires --base-url <url> (or $CLAUDELY_BASE_URL, or run \`claudely setup\`)`,
     );
     return 2;
   }
   if (!token) {
     console.error(
-      "claudely: provider 'custom' requires --token <token> (or $CLAUDELY_TOKEN)",
+      `claudely: provider '${providerName}' requires --token <token> (or $CLAUDELY_TOKEN, or run \`claudely setup\`)`,
     );
     return 2;
   }
diff --git a/src/setup.ts b/src/setup.ts
index b4fa060..a4ce401 100644
--- a/src/setup.ts
+++ b/src/setup.ts
@@ -29,14 +29,22 @@ export async function runSetup(): Promise<number> {
 
   const provider = PROVIDERS[providerName];
 
+  const providerDefault = provider.defaultBaseUrl();
   const baseUrl = await input({
-    message: "Base URL",
-    default: existing.baseUrl ?? provider.defaultBaseUrl(),
+    message: existing.baseUrl && existing.baseUrl !== providerDefault
+      ? `Base URL (provider default: ${providerDefault})`
+      : "Base URL",
+    default: existing.baseUrl || providerDefault,
   });
 
+  const tokenDefault = provider.defaultToken;
   const token = await input({
-    message: "Auth token",
-    default: existing.token ?? provider.defaultToken,
+    message: tokenDefault
+      ? existing.token && existing.token !== tokenDefault
+        ? `Auth token (provider default: ${tokenDefault})`
+        : "Auth token"
+      : "Auth token (required)",
+    default: existing.token || tokenDefault,
   });
 
   let models: ModelEntry[] = [];
@@ -73,13 +81,14 @@ export async function runSetup(): Promise<number> {
     if (manual) model = manual;
   }
 
-  const config: ClaudelyConfig = { provider: providerName, baseUrl, token };
+  const config: ClaudelyConfig = { provider: providerName, baseUrl };
+  if (token) config.token = token;
   if (model) config.model = model;
 
   console.log("\nConfig to save:");
   console.log(`  provider:  ${config.provider}`);
   console.log(`  baseUrl:   ${config.baseUrl}`);
-  console.log(`  token:     ${config.token}`);
+  console.log(`  token:     ${config.token ?? "(provider default)"}`);
   if (config.model) console.log(`  model:     ${config.model}`);
   console.log();