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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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4
src/Server/Builder.php
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@ -32,7 +32,7 @@ use Mcp\Exception\LogicException;
use Mcp\JsonRpc\MessageFactory;
use Mcp\Schema\Annotations;
use Mcp\Schema\Enum\ProtocolVersion;
use Mcp\Schema\Extension\ServerExtensionInterface;
use Mcp\Schema\Extension\ExtensionInterface;
use Mcp\Schema\Icon;
use Mcp\Schema\Implementation;
use Mcp\Schema\Prompt;
@ -282,7 +282,7 @@ final class Builder
*
* @throws LogicException if the same extension is enabled more than once
*/
public function enableExtension(ServerExtensionInterface ...$extensions): self
public function enableExtension(ExtensionInterface ...$extensions): self
{
foreach ($extensions as $extension) {
$id = $extension->getId();