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[Schema][Client][Server] Close MCP Apps gaps: extension negotiation checks (#429)

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* [Schema][Client][Server] Close MCP Apps gaps: extension negotiation checks

Add ClientGateway::supportsExtension(), Client\Builder::enableExtension() and
ClientCapabilities::withExtensions(); introduce side-agnostic ExtensionInterface
and deprecate ServerExtensionInterface; document attribute-based UI linkage.

* Drop ServerExtensionInterface in favour of ExtensionInterface
This commit is contained in:
Christopher Hertel 2026-08-18 01:46:53 +02:00 • committed by GitHub
commit 6f58fe596a
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1 changed files with 273 additions and 21 deletions
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53
tests/Unit/Capability/Discovery/Fixtures/DiscoverableUiHandler.php Normal file
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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\Tests\Unit\Capability\Discovery\Fixtures;
use Mcp\Capability\Attribute\McpResource;
use Mcp\Capability\Attribute\McpTool;
use Mcp\Schema\Content\TextResourceContents;
use Mcp\Schema\Extension\Apps\McpApps;
use Mcp\Schema\Extension\Apps\ToolVisibility;
use Mcp\Schema\Extension\Apps\UiResourceContentMeta;
use Mcp\Schema\Extension\Apps\UiResourceCsp;
use Mcp\Schema\Extension\Apps\UiToolMeta;
/**
* An MCP App declared purely through attributes: a `ui://` resource flagged with the
* `_meta.ui` marker and a tool linked to it via `UiToolMeta`.
*/
class DiscoverableUiHandler
{
#[McpResource(
uri: 'ui://widget/clock',
name: 'clock_widget',
mimeType: McpApps::MIME_TYPE,
meta: ['ui' => new \stdClass()],
)]
public function widget(): TextResourceContents
{
return new TextResourceContents(
uri: 'ui://widget/clock',
mimeType: McpApps::MIME_TYPE,
text: '<html></html>',
meta: ['ui' => new UiResourceContentMeta(csp: new UiResourceCsp(connectDomains: ['https://time.example.com']))],
);
}
#[McpTool(
name: 'show_clock',
meta: ['ui' => new UiToolMeta(resourceUri: 'ui://widget/clock', visibility: [ToolVisibility::App])],
)]
public function showClock(string $timezone): string
{
return $timezone;
}
}