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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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13
examples/server/mcp-apps/WeatherApp.php
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@ -16,6 +16,7 @@ use Mcp\Schema\Extension\Apps\McpApps;
use Mcp\Schema\Extension\Apps\UiResourceContentMeta;
use Mcp\Schema\Extension\Apps\UiResourceCsp;
use Mcp\Schema\Extension\Apps\UiResourcePermissions;
use Mcp\Server\RequestContext;
final class WeatherApp
{
@ -39,7 +40,7 @@ final class WeatherApp
);
}
public function getWeather(string $city): string
public function getWeather(string $city, RequestContext $context): string
{
$weather = [
'london' => ['temp' => '15°C', 'condition' => 'Cloudy', 'humidity' => '78%'],
@ -56,12 +57,20 @@ final class WeatherApp
$key = strtolower($city);
$data = $weather[$key] ?? ['temp' => '20°C', 'condition' => 'Clear', 'humidity' => '60%'];
return \sprintf(
$text = \sprintf(
'Weather in %s: %s, %s, Humidity: %s',
$city,
$data['temp'],
$data['condition'],
$data['humidity'],
);
// Hosts without MCP Apps support only ever see this text; the ones that
// negotiated the extension render the ui://weather-app view on top of it.
if (!$context->getClientGateway()->supportsExtension(McpApps::EXTENSION_ID)) {
return $text.' (text-only, host does not support MCP Apps)';
}
return $text;
}
}