feat(flake): consume learnharness from GDR/learnharness flake input

flake.nix

@@ -53,9 +53,14 @@
     private-extension = {
       url = "path:./extensions/empty";
     };
+
+    learnharness = {
+      url = "github:GDR/learnharness";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = inputs@{ self, nixpkgs, charon-key, ... }:
+  outputs = inputs@{ self, nixpkgs, charon-key, learnharness, ... }:
     let
       lib = nixpkgs.lib.extend (lib: _:
         let hm = inputs.home-manager.lib.hm; in {
@@ -84,7 +89,7 @@
         let
           pkgs = import nixpkgs { inherit system; config.allowUnfree = true; nvidia.acceptLicense = true; };
         in
-        import ./packages.nix { inherit pkgs lib system charon-key; }
+        import ./packages.nix { inherit pkgs lib system charon-key learnharness; }
       );
 
       devShells = forAllSystems (system:

hosts/machines/mac-brightstar/default.nix

@@ -39,7 +39,16 @@ in
       home.utils.obsidian.enable = true;
       # host-specific
       home.ai-tools.enable = true;
-      home.ai-tools.learnharness.enable = true;
+      home.ai-tools.learnharness = {
+        enable = true;
+        autoUpdate = false;
+        obsidianFolders = [ "/Users/dgarifullin/obsidian-vault" ];
+        models = {
+          strong = { provider = "antigravity"; id = "gemini-4-argon"; thinkingLevel = "high"; };
+          cheap = { provider = "antigravity"; id = "gemini-3.8-flash"; thinkingLevel = "high"; };
+          vision = { provider = "antigravity"; id = "gemini-4-argon"; thinkingLevel = "medium"; };
+        };
+      };
       home.editors.antigravity = { enable = true; } // userDefaults.antigravity;
       home.utils.raycast.enable = false; # disabled: nixpkgs download URL broken
     };

modules/_core/user.nix

@@ -324,6 +324,7 @@ in
         useGlobalPkgs = true;
         # Back up existing files instead of failing
         backupFileExtension = "backup";
+        sharedModules = optional (inputs ? learnharness && inputs.learnharness ? homeManagerModules.default) inputs.learnharness.homeManagerModules.default;
 
         users = mapAttrs
           (userName: userCfg:

modules/home/ai-tools/learnharness.nix

@@ -1,13 +1,101 @@
 # LearnHarness - An agent harness for learning
-{ lib, ... }:
+{ lib, pkgs ? null, ... }:
 
+let
+  modelSlotOption = description:
+    lib.mkOption {
+      type = lib.types.nullOr (lib.types.submodule {
+        options = {
+          provider = lib.mkOption {
+            type = lib.types.str;
+            description = "Provider ID (e.g. 'antigravity', 'anthropic', 'openai', 'openrouter').";
+          };
+          id = lib.mkOption {
+            type = lib.types.str;
+            description = "Model ID within the provider.";
+          };
+          thinkingLevel = lib.mkOption {
+            type = lib.types.nullOr (lib.types.enum [ "off" "minimal" "low" "medium" "high" "xhigh" "max" ]);
+            default = null;
+            description = "Optional thinking budget level.";
+          };
+        };
+      });
+      default = null;
+      inherit description;
+    };
+in
 lib.my.mkFeature {
   platforms = [
     "linux"
     "darwin"
   ];
   description = "LearnHarness - An agent harness for learning";
-  homeModule = { pkgs, ... }: {
-    home.packages = [ pkgs.learnharness ];
+
+  extraOptions = {
+    package = lib.mkOption {
+      type = lib.types.nullOr lib.types.package;
+      default = if pkgs != null && pkgs ? learnharness then pkgs.learnharness else null;
+      description = "LearnHarness package to install.";
+    };
+
+    autoUpdate = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = "Whether LearnHarness should check for automatic updates.";
+    };
+
+    obsidianFolders = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [ ];
+      example = [ "~/obsidian-vault" ];
+      description = "Obsidian vault/project folder paths where agent Markdown write/edit tools are allowed to operate.";
+    };
+
+    models = {
+      strong = modelSlotOption "Strong model slot (used by prober and teacher agents).";
+      cheap = modelSlotOption "Cheap/fast model slot (used by researcher, demoBuilder, extractor, auditor).";
+      vision = modelSlotOption "Vision model slot (used by visualMaker and pdfReader).";
+    };
+
+    tools = lib.mkOption {
+      type = lib.types.attrsOf lib.types.bool;
+      default = { };
+      description = "Per-tool enable/disable overrides (absent = enabled).";
+    };
+
+    searchEngine = lib.mkOption {
+      type = lib.types.nullOr (lib.types.enum [ "brave" "exa" "perplexity" "serper" "tavily" ]);
+      default = null;
+      description = "Preferred web search engine when multiple search API keys are configured.";
+    };
+
+    graphTools = lib.mkOption {
+      type = lib.types.nullOr lib.types.bool;
+      default = null;
+      description = "Whether prober knowledge-graph inspection tools are enabled.";
+    };
+
+    extraSettings = lib.mkOption {
+      type = lib.types.attrsOf lib.types.anything;
+      default = { };
+      description = "Additional raw settings deep-merged into settings.json.";
+    };
+  };
+
+  homeModule = { pkgs, featureCfg, ... }: {
+    programs.learnharness = {
+      enable = true;
+      package = if (featureCfg.package or null) != null then featureCfg.package else pkgs.learnharness;
+      inherit (featureCfg)
+        autoUpdate
+        obsidianFolders
+        models
+        tools
+        searchEngine
+        graphTools
+        extraSettings
+        ;
+    };
   };
 }

overlays/additions.nix

@@ -5,6 +5,7 @@ final: _prev:
 (import ../pkgs { inherit system; pkgs = final; }) // {
   charon-key = inputs.charon-key.packages.${system}.default;
   clavis = if inputs ? clavis && inputs.clavis ? packages.${system} then inputs.clavis.packages.${system}.default else null;
+  learnharness = inputs.learnharness.packages.${system}.default;
 
   # Antigravity 2.x packages from the upstream flake
   google-antigravity = inputs.antigravity-nix.packages.${system}.google-antigravity;

packages.nix

@@ -1,7 +1,8 @@
-{ pkgs, lib, system, charon-key }:
+{ pkgs, lib, system, charon-key, learnharness }:
 let
   customPkgs = import ./pkgs { inherit pkgs lib system; };
 in
 customPkgs // {
   charon-key = charon-key.packages.${system}.default;
+  learnharness = learnharness.packages.${system}.default;
 }

pkgs/default.nix

@@ -8,7 +8,6 @@ let
 
   common = {
     apple-emoji-ttf = pkgs.callPackage ./apple-emoji-ttf { };
-    learnharness = pkgs.callPackage ./learnharness { };
     # Custom pre-commit to avoid Swift dependency on Darwin
     pre-commit = pkgs.callPackage ./pre-commit { };
   };