Introducing Capability Registry & Discovery

Author: chr-hertel

src/Capability/Attribute/CompletionProvider.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Capability\Attribute;
+
+use Mcp\Capability\Prompt\Completion\ProviderInterface;
+use Mcp\Exception\InvalidArgumentException;
+
+/**
+ * @author Kyrian Obikwelu <[email protected]>
+ */
+#[\Attribute(\Attribute::TARGET_PARAMETER)]
+class CompletionProvider
+{
+    /**
+     * @param class-string<ProviderInterface>|null                   $providerClass
+     * @param class-string<ProviderInterface>|ProviderInterface|null $provider      if a class-string, it will be
+     *                                                                              resolved from the container at the
+     *                                                                              point of use
+     */
+    public function __construct(
+        public ?string $providerClass = null,
+        public string|ProviderInterface|null $provider = null,
+        public ?array $values = null,
+        public ?string $enum = null,
+    ) {
+        if (1 !== \count(array_filter([$provider, $values, $enum]))) {
+            throw new InvalidArgumentException('Only one of provider, values, or enum can be set.');
+        }
+    }
+}

src/Capability/Attribute/McpPrompt.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Capability\Attribute;
+
+/**
+ * Marks a PHP method as an MCP Prompt generator.
+ * The method should return the prompt messages, potentially using arguments for templating.
+ *
+ * @author Kyrian Obikwelu <[email protected]>
+ */
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_CLASS)]
+final class McpPrompt
+{
+    /**
+     * @param ?string $name        overrides the prompt name (defaults to method name)
+     * @param ?string $description Optional description of the prompt. Defaults to method DocBlock summary.
+     */
+    public function __construct(
+        public ?string $name = null,
+        public ?string $description = null,
+    ) {
+    }
+}

src/Capability/Attribute/McpResource.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Capability\Attribute;
+
+use Mcp\Schema\Annotations;
+
+/**
+ * Marks a PHP class as representing or handling a specific MCP Resource instance.
+ * Used primarily for the 'resources/list' discovery.
+ *
+ * @author Kyrian Obikwelu <[email protected]>
+ */
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_CLASS)]
+final class McpResource
+{
+    /**
+     * @param string           $uri         The specific URI identifying this resource instance. Must be unique within the server.
+     * @param ?string          $name        A human-readable name for this resource. If null, a default might be generated from the method name.
+     * @param ?string          $description An optional description of the resource. Defaults to class DocBlock summary.
+     * @param ?string          $mimeType    the MIME type, if known and constant for this resource
+     * @param ?int             $size        the size in bytes, if known and constant
+     * @param Annotations|null $annotations optional annotations describing the resource
+     */
+    public function __construct(
+        public string $uri,
+        public ?string $name = null,
+        public ?string $description = null,
+        public ?string $mimeType = null,
+        public ?int $size = null,
+        public ?Annotations $annotations = null,
+    ) {
+    }
+}

src/Capability/Attribute/McpResourceTemplate.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Capability\Attribute;
+
+use Mcp\Schema\Annotations;
+
+/**
+ * Marks a PHP class definition as representing an MCP Resource Template.
+ * This is informational, used for 'resources/templates/list'.
+ *
+ * @author Kyrian Obikwelu <[email protected]>
+ */
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_CLASS)]
+final class McpResourceTemplate
+{
+    /**
+     * @param string       $uriTemplate the URI template string (RFC 6570)
+     * @param ?string      $name        A human-readable name for the template type.  If null, a default might be generated from the method name.
+     * @param ?string      $description Optional description. Defaults to class DocBlock summary.
+     * @param ?string      $mimeType    optional default MIME type for matching resources
+     * @param ?Annotations $annotations optional annotations describing the resource template
+     */
+    public function __construct(
+        public string $uriTemplate,
+        public ?string $name = null,
+        public ?string $description = null,
+        public ?string $mimeType = null,
+        public ?Annotations $annotations = null,
+    ) {
+    }
+}

src/Capability/Attribute/McpTool.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Capability\Attribute;
+
+use Mcp\Schema\ToolAnnotations;
+
+/**
+ * @author Kyrian Obikwelu <[email protected]>
+ */
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_CLASS)]
+class McpTool
+{
+    /**
+     * @param string|null          $name        The name of the tool (defaults to the method name)
+     * @param string|null          $description The description of the tool (defaults to the DocBlock/inferred)
+     * @param ToolAnnotations|null $annotations Optional annotations describing tool behavior
+     */
+    public function __construct(
+        public ?string $name = null,
+        public ?string $description = null,
+        public ?ToolAnnotations $annotations = null,
+    ) {
+    }
+}