diff --git a/README.md b/README.md
index 6ad0336..37ee180 100644
--- a/README.md
+++ b/README.md
@@ -207,6 +207,11 @@ Just trying it: `nix run github:house-of-vanity/tsunagi#tsunagi-cli -- --help`.
 `packages.<system>.tsunagi` (with the tray) and `tsunagi-cli` are also exported,
 along with `overlays.default`.
 
+For development from a checkout, `nix develop` also exposes the tray's native
+runtime libraries, including AppIndicator and graphics/windowing libraries.
+Cargo-built binaries such as `target/debug/tsunagi-tray` can run directly inside
+this shell, without installing the packaged wrapper.
+
 ## Build from source
 
 Rust 1.91 or newer.
diff --git a/flake.nix b/flake.nix
index ac4a232..4906d4f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -26,14 +26,26 @@
 
       nixosModules.default = import ./nix/module.nix self;
 
-      devShells = forAllSystems (pkgs: {
-        default = pkgs.mkShell {
-          inputsFrom = [ self.packages.${pkgs.stdenv.hostPlatform.system}.tsunagi ];
-          packages = [
-            pkgs.rustfmt
-            pkgs.clippy
-          ];
-        };
-      });
+      devShells = forAllSystems (
+        pkgs:
+        let
+          trayPackage = self.packages.${pkgs.stdenv.hostPlatform.system}.tsunagi;
+        in
+        {
+          default = pkgs.mkShell {
+            inputsFrom = [ trayPackage ];
+            packages = [
+              pkgs.rustfmt
+              pkgs.clippy
+            ]
+            ++ trayPackage.trayRuntimeLibs;
+            # Cargo binaries have no installed wrapper. Expose runtime-loaded
+            # libraries here too, while preserving the caller's library path.
+            shellHook = ''
+              export LD_LIBRARY_PATH="${pkgs.lib.makeLibraryPath trayPackage.trayRuntimeLibs}:/run/opengl-driver/lib''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+            '';
+          };
+        }
+      );
     };
 }
diff --git a/nix/package.nix b/nix/package.nix
index 7cf1e05..87553b7 100644
--- a/nix/package.nix
+++ b/nix/package.nix
@@ -52,7 +52,10 @@ rustPlatform.buildRustPackage {
   # The suite opens real sockets and interfaces; it runs in CI instead.
   doCheck = false;
 
-  nativeBuildInputs = [ pkg-config ] ++ lib.optionals withTray [
+  nativeBuildInputs = [
+    pkg-config
+  ]
+  ++ lib.optionals withTray [
     copyDesktopItems
     wrapGAppsHook3
   ];
@@ -64,6 +67,10 @@ rustPlatform.buildRustPackage {
 
   dontWrapGApps = true;
 
+  # The development shell runs unwrapped Cargo binaries and needs the same
+  # dynamically loaded libraries as the installed tray wrapper.
+  passthru = { inherit trayRuntimeLibs; };
+
   postInstall = ''
     install -Dm644 dist/linux/50-tsunagi-resolved.rules \
       "$out/share/doc/tsunagi/50-tsunagi-resolved.rules"