diff --git a/psalm.xml b/psalm.xml
index 78df975..a2dbf3d 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -17,4 +17,7 @@
     <disableExtensions>
         <extension name="random" />
     </disableExtensions>
+    <issueHandlers>
+        <UndefinedAttributeClass errorLevel="suppress" />
+    </issueHandlers>
 </psalm>
diff --git a/src/Application.php b/src/Application.php
index 3e9894e..96a8be7 100644
--- a/src/Application.php
+++ b/src/Application.php
@@ -46,6 +46,7 @@ private function __construct(
      *
      * @return self<ServerRequest, Response>
      */
+    #[\NoDiscard]
     public static function http(OperatingSystem $os, Environment $env): self
     {
         return new self(Application\Http::of($os, $env));
@@ -56,6 +57,7 @@ public static function http(OperatingSystem $os, Environment $env): self
      *
      * @return self<CliEnv, Attempt<CliEnv>>
      */
+    #[\NoDiscard]
     public static function cli(OperatingSystem $os, Environment $env): self
     {
         return new self(Application\Cli::of($os, $env));
@@ -67,6 +69,7 @@ public static function cli(OperatingSystem $os, Environment $env): self
      *
      * @return self<CliEnv, Attempt<CliEnv>>
      */
+    #[\NoDiscard]
     public static function asyncHttp(OperatingSystem $os): self
     {
         return new self(Application\Async\Http::of($os));
@@ -79,6 +82,7 @@ public static function asyncHttp(OperatingSystem $os): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function mapEnvironment(callable $map): self
     {
         return new self($this->app->mapEnvironment($map));
@@ -91,6 +95,7 @@ public function mapEnvironment(callable $map): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function mapOperatingSystem(callable $map): self
     {
         return new self($this->app->mapOperatingSystem($map));
@@ -101,6 +106,7 @@ public function mapOperatingSystem(callable $map): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function map(Middleware $map): self
     {
         /** @psalm-suppress ImpureMethodCall Mutation free to force the user to use the returned object */
@@ -114,6 +120,7 @@ public function map(Middleware $map): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function service(Service $name, callable $definition): self
     {
         return new self($this->app->service($name, $definition));
@@ -126,6 +133,7 @@ public function service(Service $name, callable $definition): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function command(callable $command): self
     {
         return new self($this->app->command($command));
@@ -138,6 +146,7 @@ public function command(callable $command): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function mapCommand(callable $map): self
     {
         return new self($this->app->mapCommand($map));
@@ -150,6 +159,7 @@ public function mapCommand(callable $map): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function route(Http\Route\Reference|callable $handle): self
     {
         if ($handle instanceof Http\Route\Reference) {
@@ -166,6 +176,7 @@ public function route(Http\Route\Reference|callable $handle): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function routes(string $routes): self
     {
         $self = $this;
@@ -184,6 +195,7 @@ public function routes(string $routes): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function mapRoute(callable $map): self
     {
         return new self($this->app->mapRoute($map));
@@ -196,6 +208,7 @@ public function mapRoute(callable $map): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function routeNotFound(callable $handle): self
     {
         return new self($this->app->routeNotFound($handle));
@@ -208,6 +221,7 @@ public function routeNotFound(callable $handle): self
      *
      * @return self<I, O>
      */
+    #[\NoDiscard]
     public function recoverRouteError(callable $recover): self
     {
         return new self($this->app->recoverRouteError($recover));
@@ -218,6 +232,7 @@ public function recoverRouteError(callable $recover): self
      *
      * @return O
      */
+    #[\NoDiscard]
     public function run(CliEnv|ServerRequest $input): Attempt|Response
     {
         return $this->app->run($input);
diff --git a/src/Cli/Command.php b/src/Cli/Command.php
index cd9ddee..0198973 100644
--- a/src/Cli/Command.php
+++ b/src/Cli/Command.php
@@ -41,6 +41,7 @@ public function __invoke(Console $console): Attempt
      *
      * @param class-string<CommandInterface> $class
      */
+    #[\NoDiscard]
     public static function of(
         string $class,
         Service ...$dependencies,
diff --git a/src/Environment.php b/src/Environment.php
index 318f7b0..ed3b960 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -27,6 +27,7 @@ private function __construct(private Map $variables)
      *
      * @param Map<string, string> $variables
      */
+    #[\NoDiscard]
     public static function of(Map $variables): self
     {
         return new self($variables);
@@ -37,6 +38,7 @@ public static function of(Map $variables): self
      *
      * @param list<array{string, string}> $variables
      */
+    #[\NoDiscard]
     public static function test(array $variables): self
     {
         return self::of(Map::of(...$variables));
@@ -45,6 +47,7 @@ public static function test(array $variables): self
     /**
      * @psalm-pure
      */
+    #[\NoDiscard]
     public static function http(HttpEnvironment $env): self
     {
         return $env->reduce(
@@ -53,6 +56,7 @@ public static function http(HttpEnvironment $env): self
         );
     }
 
+    #[\NoDiscard]
     public function with(string $key, string $value): self
     {
         return new self(($this->variables)($key, $value));
@@ -63,6 +67,7 @@ public function with(string $key, string $value): self
      *
      * @throws LogicException If the variable doesn't exist
      */
+    #[\NoDiscard]
     public function get(string $key): string
     {
         return $this->maybe($key)->match(
@@ -74,6 +79,7 @@ public function get(string $key): string
     /**
      * @return Maybe<string>
      */
+    #[\NoDiscard]
     public function maybe(string $key): Maybe
     {
         return $this->variables->get($key);
@@ -82,6 +88,7 @@ public function maybe(string $key): Maybe
     /**
      * @return Map<string, string>
      */
+    #[\NoDiscard]
     public function all(): Map
     {
         return $this->variables;
diff --git a/src/Http/Route.php b/src/Http/Route.php
index 12c75da..ba2ad86 100644
--- a/src/Http/Route.php
+++ b/src/Http/Route.php
@@ -31,6 +31,7 @@ private function __construct()
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function get(
         string|Template|Alias $endpoint,
         Service $handler,
@@ -52,6 +53,7 @@ public static function get(
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function post(
         string|Template|Alias $endpoint,
         Service $handler,
@@ -73,6 +75,7 @@ public static function post(
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function put(
         string|Template|Alias $endpoint,
         Service $handler,
@@ -94,6 +97,7 @@ public static function put(
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function patch(
         string|Template|Alias $endpoint,
         Service $handler,
@@ -115,6 +119,7 @@ public static function patch(
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function delete(
         string|Template|Alias $endpoint,
         Service $handler,
@@ -136,6 +141,7 @@ public static function delete(
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function options(
         string|Template|Alias $endpoint,
         Service $handler,
@@ -157,6 +163,7 @@ public static function options(
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function trace(
         string|Template|Alias $endpoint,
         Service $handler,
@@ -178,6 +185,7 @@ public static function trace(
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function connect(
         string|Template|Alias $endpoint,
         Service $handler,
@@ -199,6 +207,7 @@ public static function connect(
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function head(
         string|Template|Alias $endpoint,
         Service $handler,
@@ -220,6 +229,7 @@ public static function head(
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function link(
         string|Template|Alias $endpoint,
         Service $handler,
@@ -241,6 +251,7 @@ public static function link(
      *
      * @return callable(Pipe, Container): Component<mixed, Response>
      */
+    #[\NoDiscard]
     public static function unlink(
         string|Template|Alias $endpoint,
         Service $handler,
diff --git a/src/Http/Route/Reference.php b/src/Http/Route/Reference.php
index 9967289..feac960 100644
--- a/src/Http/Route/Reference.php
+++ b/src/Http/Route/Reference.php
@@ -19,5 +19,6 @@ interface Reference extends \UnitEnum
     /**
      * @return callable(Pipe, Container): Component<SideEffect, Response>
      */
+    #[\NoDiscard]
     public function route(): callable;
 }
diff --git a/src/Middleware.php b/src/Middleware.php
index 8303918..de06db0 100644
--- a/src/Middleware.php
+++ b/src/Middleware.php
@@ -20,5 +20,6 @@ interface Middleware
      *
      * @return Application<I, O>
      */
+    #[\NoDiscard]
     public function __invoke(Application $app): Application;
 }