Enable servers to send sampling messages to clients (#101)

examples/stdio-client-communication/server.php

@@ -13,70 +13,18 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 chdir(__DIR__);
 
-use Mcp\Schema\Content\TextContent;
 use Mcp\Schema\Enum\LoggingLevel;
-use Mcp\Schema\JsonRpc\Error as JsonRpcError;
 use Mcp\Schema\ServerCapabilities;
 use Mcp\Server;
 use Mcp\Server\ClientGateway;
 use Mcp\Server\Transport\StdioTransport;
 
-$capabilities = new ServerCapabilities(logging: true, tools: true);
-
 $server = Server::builder()
     ->setServerInfo('STDIO Client Communication Demo', '1.0.0')
     ->setLogger(logger())
     ->setContainer(container())
-    ->setCapabilities($capabilities)
-    ->addTool(
-        function (string $incidentTitle, ClientGateway $client): array {
-            $client->log(LoggingLevel::Warning, sprintf('Incident triage started: %s', $incidentTitle));
-
-            $steps = [
-                'Collecting telemetry',
-                'Assessing scope',
-                'Coordinating responders',
-            ];
-
-            foreach ($steps as $index => $step) {
-                $progress = ($index + 1) / count($steps);
-
-                $client->progress(progress: $progress, total: 1, message: $step);
-
-                usleep(180_000); // Simulate work being done
-            }
-
-            $prompt = sprintf(
-                'Provide a concise response strategy for incident "%s" based on the steps completed: %s.',
-                $incidentTitle,
-                implode(', ', $steps)
-            );
-
-            $sampling = $client->sample(
-                prompt: $prompt,
-                maxTokens: 350,
-                timeout: 90,
-                options: ['temperature' => 0.5]
-            );
-
-            if ($sampling instanceof JsonRpcError) {
-                throw new RuntimeException(sprintf('Sampling request failed (%d): %s', $sampling->code, $sampling->message));
-            }
-
-            $result = $sampling->result;
-            $recommendation = $result->content instanceof TextContent ? trim((string) $result->content->text) : '';
-
-            $client->log(LoggingLevel::Info, sprintf('Incident triage completed for %s', $incidentTitle));
-
-            return [
-                'incident' => $incidentTitle,
-                'recommended_actions' => $recommendation,
-                'model' => $result->model,
-            ];
-        },
-        name: 'coordinate_incident_response',
-        description: 'Coordinate an incident response with logging, progress, and sampling.'
-    )
+    ->setCapabilities(new ServerCapabilities(logging: true, tools: true))
+    ->setDiscovery(__DIR__)
     ->addTool(
         function (string $dataset, ClientGateway $client): array {
             $client->log(LoggingLevel::Info, sprintf('Running quality checks on dataset "%s"', $dataset));