diff --git a/home/common/default.nix b/home/common/default.nix
index 92e9285c4..aebba2dd6 100644
--- a/home/common/default.nix
+++ b/home/common/default.nix
@@ -1160,6 +1160,28 @@ in
       # PATH = "$HOME/bin:$PATH";
       NIXOS_OZONE_WL = "1"; # This variable fixes electron apps in wayland
       NIXPKGS_ALLOW_UNFREE = "1";
+      # OpenCode feature flags (Drew, 2026-10-20): both web-search backends
+      # (Exa + Parallel) so the websearch tool works with any provider, and
+      # the interesting experimental features. OPENCODE_EXPERIMENTAL is the
+      # umbrella (code mode keys off it). NATIVE_LLM deliberately not set.
+      OPENCODE_ENABLE_EXA = "1";
+      OPENCODE_ENABLE_PARALLEL = "1";
+      OPENCODE_ENABLE_EXPERIMENTAL_MODELS = "1";
+      OPENCODE_EXPERIMENTAL = "1";
+      OPENCODE_EXPERIMENTAL_PARALLEL = "1";
+      OPENCODE_EXPERIMENTAL_PLAN_MODE = "1";
+      OPENCODE_EXPERIMENTAL_SCOUT = "1";
+      OPENCODE_EXPERIMENTAL_WORKSPACES = "1";
+      OPENCODE_EXPERIMENTAL_LSP_TOOL = "1";
+      OPENCODE_EXPERIMENTAL_OXFMT = "1";
+      OPENCODE_EXPERIMENTAL_EXA = "1";
+      OPENCODE_EXPERIMENTAL_EVENT_SYSTEM = "1";
+      OPENCODE_EXPERIMENTAL_ICON_DISCOVERY = "1";
+      OPENCODE_EXPERIMENTAL_DISABLE_COPY_ON_SELECT = "1";
+      # File watcher off by default (Drew, 2026-10-20): the working trees
+      # are giant, and watching costs more than the live-external-edit
+      # awareness it buys. Diffs are git-computed on demand either way.
+      OPENCODE_EXPERIMENTAL_DISABLE_FILEWATCHER = "1";
       # XDG_CACHE_HOME = "$HOME/.cache";
       # XDG_CONFIG_DIRS = "/etc/xdg";
       # XDG_CONFIG_HOME = "$HOME/.config";