diff --git a/config/opencode/config.json b/config/opencode/config.json
deleted file mode 100644
index dad56b3..0000000
--- a/config/opencode/config.json
+++ /dev/null
@@ -1,43 +0,0 @@
-{
-  "$schema": "https://opencode.ai/config.json",
-  "lsp": true,
-  "formatter": {
-    "nixfmt": {
-      "command": ["nixfmt", "$FILE"],
-      "extensions": [".nix"]
-    },
-    "prettier": {
-      "command": ["prettier", "--write", "$FILE"],
-      "extensions": [".md", ".yaml", ".yml", ".json", ".css", ".html", ".js", ".ts", ".jsx", ".tsx"]
-    },
-    "shfmt": {
-      "command": ["shfmt", "-w", "$FILE"],
-      "extensions": [".sh", ".bash"]
-    },
-    "ruff": {
-      "command": ["ruff", "format", "$FILE"],
-      "extensions": [".py"]
-    },
-    "taplo": {
-      "command": ["taplo", "format", "$FILE"],
-      "extensions": [".toml"]
-    },
-    "stylua": {
-      "command": ["stylua", "$FILE"],
-      "extensions": [".lua"]
-    }
-  },
-  "disabled_providers": ["opencode"],
-  "provider": {
-    "halo": {
-      "npm": "@ai-sdk/openai-compatible",
-      "name": "Halo",
-      "options": {
-        "baseURL": "http://halo:8000/v1"
-      },
-      "models": {
-        "coder": { "name": "coder" }
-      }
-    }
-  }
-}
diff --git a/modules/home/cli-apps/opencode/default.nix b/modules/home/cli-apps/opencode/default.nix
index f2b54c7..7f1f11b 100644
--- a/modules/home/cli-apps/opencode/default.nix
+++ b/modules/home/cli-apps/opencode/default.nix
@@ -11,6 +11,83 @@ let
 
   cfg = config.metacfg.cli-apps.opencode;
 
+  # Formatters opencode runs on save, each pinned to its exact store path.
+  formatters = {
+    nixfmt = {
+      command = [
+        (lib.getExe pkgs.nixfmt-rfc-style)
+        "$FILE"
+      ];
+      extensions = [ ".nix" ];
+    };
+    prettier = {
+      command = [
+        (lib.getExe pkgs.nodePackages.prettier)
+        "--write"
+        "$FILE"
+      ];
+      extensions = [
+        ".md"
+        ".yaml"
+        ".yml"
+        ".json"
+        ".css"
+        ".html"
+        ".js"
+        ".ts"
+        ".jsx"
+        ".tsx"
+      ];
+    };
+    shfmt = {
+      command = [
+        (lib.getExe pkgs.shfmt)
+        "-w"
+        "$FILE"
+      ];
+      extensions = [
+        ".sh"
+        ".bash"
+      ];
+    };
+    ruff = {
+      command = [
+        (lib.getExe pkgs.ruff)
+        "format"
+        "$FILE"
+      ];
+      extensions = [ ".py" ];
+    };
+    taplo = {
+      command = [
+        (lib.getExe pkgs.taplo)
+        "format"
+        "$FILE"
+      ];
+      extensions = [ ".toml" ];
+    };
+    stylua = {
+      command = [
+        (lib.getExe pkgs.stylua)
+        "$FILE"
+      ];
+      extensions = [ ".lua" ];
+    };
+  };
+
+  opencodeConfig = {
+    "$schema" = "https://opencode.ai/config.json";
+    lsp = true;
+    formatter = formatters;
+    disabled_providers = [ "opencode" ];
+    provider.halo = {
+      npm = "@ai-sdk/openai-compatible";
+      name = "Halo";
+      options.baseURL = "http://halo:8000/v1";
+      models.coder.name = "coder";
+    };
+  };
+
   obsidianSkills =
     lib.mapAttrs'
       (
@@ -30,21 +107,16 @@ in
   };
 
   config = mkIf cfg.enable {
-    # Formatters referenced by config/opencode/config.json; keep them on PATH for opencode.
-    home.packages = [
-      pkgs.nixfmt-rfc-style
-      pkgs.nodePackages.prettier
-      pkgs.shfmt
-      pkgs.ruff
-      pkgs.taplo
-      pkgs.stylua
-    ];
-
+    # The agents/, commands/ and other files come from the repo dir; config.json
+    # is generated from opencodeConfig above so formatter paths stay pinned.
     xdg.configFile."opencode" = {
       source = ../../../../config/opencode;
       recursive = true;
     };
 
+    xdg.configFile."opencode/config.json".source =
+      (pkgs.formats.json { }).generate "opencode-config.json" opencodeConfig;
+
     home.file = {
       ".agents/skills" = {
         source = ../../../../config/agents/skills;