diff --git a/nix/templates/harness-base.nix b/nix/templates/harness-base.nix
index 116ad47..b78179e 100644
--- a/nix/templates/harness-base.nix
+++ b/nix/templates/harness-base.nix
@@ -98,16 +98,22 @@
 
   options.hyperhive.claudeMarketplaces = lib.mkOption {
     type = lib.types.listOf lib.types.str;
-    default = [ ];
-    example = [ "github:anthropics/claude-plugins-official" ];
+    default = [ "anthropics/claude-plugins-official" ];
+    example = [
+      "anthropics/claude-plugins-official"
+      "anthropics/claude-plugins-community"
+    ];
     description = ''
       Claude Code plugin marketplaces to add at harness boot. Each
       entry is passed to `claude plugin marketplace add <source>`
-      (URL, path, or `github:owner/repo`). Idempotent — re-adding an
-      existing marketplace is treated as success. Required before
-      `hyperhive.claudePlugins` entries that reference a marketplace
-      (e.g. `foo@some-marketplace`). Rendered to
-      `/etc/hyperhive/claude-marketplaces.json`.
+      (`owner/repo`, full git URL, or local path). Idempotent —
+      re-adding an existing marketplace is treated as success.
+      Required before `hyperhive.claudePlugins` entries that
+      reference a marketplace (e.g. `foo@claude-plugins-official`).
+      Rendered to `/etc/hyperhive/claude-marketplaces.json`.
+
+      Defaults to Anthropic's official marketplace; agents get it
+      out of the box without any per-agent.nix wiring.
     '';
   };