diff --git a/flake.lock b/flake.lock
index 05b1f20..dde9d7d 100644
--- a/flake.lock
+++ b/flake.lock
@@ -613,6 +613,22 @@
         "type": "github"
       }
     },
+    "opencode-anthropic-user-agent-plugin": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1773977067,
+        "narHash": "sha256-KUW3npBSvCYU5kEULmNI0MLBf6r6DFH1DUKNKNmul9Q=",
+        "owner": "dotCipher",
+        "repo": "opencode-anthropic-user-agent-plugin",
+        "rev": "5981826955f0429583ad8a5a25fd2909d292d882",
+        "type": "github"
+      },
+      "original": {
+        "owner": "dotCipher",
+        "repo": "opencode-anthropic-user-agent-plugin",
+        "type": "github"
+      }
+    },
     "pre-commit": {
       "inputs": {
         "flake-compat": "flake-compat_2",
@@ -653,6 +669,7 @@
         "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs",
         "noctalia": "noctalia",
+        "opencode-anthropic-user-agent-plugin": "opencode-anthropic-user-agent-plugin",
         "rust-overlay": "rust-overlay",
         "zen-browser": "zen-browser"
       }
diff --git a/flake.nix b/flake.nix
index 801a4c9..3ac9f1f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -83,6 +83,11 @@
       url = "github:ChrisOboe/json2steamshortcut";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    opencode-anthropic-user-agent-plugin = {
+      url = "github:dotCipher/opencode-anthropic-user-agent-plugin";
+      flake = false;
+    };
   };
 
   outputs =
diff --git a/home-manager/progs/opencode.nix b/home-manager/progs/opencode.nix
index 5ef4a26..c78cd9e 100644
--- a/home-manager/progs/opencode.nix
+++ b/home-manager/progs/opencode.nix
@@ -39,10 +39,13 @@ let
       writing.model = "openrouter/google/gemini-3-flash-preview";
     };
   };
+  oh-my-opencode-pkg = inputs.llm-agents.packages.${pkgs.stdenv.hostPlatform.system}.oh-my-opencode;
+
+  anthropic-user-agent-plugin = inputs.opencode-anthropic-user-agent-plugin;
 in
 {
   home.packages = [
-    inputs.llm-agents.packages.${pkgs.stdenv.hostPlatform.system}.oh-my-opencode
+    oh-my-opencode-pkg
     pkgs.playwright-driver.browsers
   ];
 
@@ -53,6 +56,13 @@ in
 
   xdg.configFile."opencode/oh-my-opencode.json".text = builtins.toJSON ohMyOpencodeConfig;
 
+  # Plugins are placed directly in the plugins directory so opencode
+  # auto-discovers them instead of downloading them from npm at runtime.
+  xdg.configFile."opencode/plugins/oh-my-opencode.js".source =
+    "${oh-my-opencode-pkg}/lib/oh-my-opencode/dist/index.js";
+  xdg.configFile."opencode/plugins/opencode-anthropic-user-agent-plugin.js".source =
+    "${anthropic-user-agent-plugin}/index.js";
+
   xdg.configFile."opencode/skills/playwright.md".text =
     let
       browsers = pkgs.playwright-driver.browsers;
@@ -166,11 +176,8 @@ in
       small_model = "openrouter/openai/gpt-oss-20b:free";
 
       autoshare = false;
-      # note: this updates opencode (and plugins like oh-my-opencode) at launch,
-      # bypassing the version pinned in flake.lock
-      autoupdate = true;
+      autoupdate = false;
       agent = { };
-      plugin = [ "oh-my-opencode" ];
       provider = {
         openrouter = {
           models = {