feat: implement agent skills

home/features/coding/opencode.nix

@@ -1,27 +1,33 @@
-{inputs, ...}: {
-  xdg.configFile = {
-    "opencode/commands" = {
-      source = "${inputs.agents}/commands";
-      recursive = true;
-    };
-    "opencode/context" = {
-      source = "${inputs.agents}/context";
-      recursive = true;
-    };
-    "opencode/prompts" = {
-      source = "${inputs.agents}/prompts";
-      recursive = true;
-    };
-    "opencode/skills" = {
-      source = "${inputs.agents}/skills";
-      recursive = true;
-    };
-    "opencode/rules" = {
-      source = "${inputs.agents}/rules";
-      recursive = true;
-    };
+{
+  inputs,
+  system,
+  ...
+}: let
+  pkgs = inputs.nixpkgs.legacyPackages.${system};
+in {
+  # Skills — composed from custom + external sources
+  xdg.configFile."opencode/skills".source = inputs.agents.lib.mkOpencodeSkills {
+    inherit pkgs;
+    customSkills = "${inputs.agents}/skills";
+    externalSkills = [
+      {
+        src = inputs.skills-anthropic;
+        selectSkills = ["docx" "frontend-design" "mcp-builder" "pdf" "mcp-builder"];
+      }
+      {
+        src = inputs.skills-basecamp;
+      }
+      {
+        src = inputs.skills-kestra;
+      }
+    ];
   };
 
+  # Other config — symlinked directly
+  xdg.configFile."opencode/context".source = "${inputs.agents}/context";
+  xdg.configFile."opencode/commands".source = "${inputs.agents}/commands";
+  xdg.configFile."opencode/prompts".source = "${inputs.agents}/prompts";
+
   programs.opencode = {
     enable = true;
     enableMcpIntegration = true;