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feat: Add output schema support to MCP tools (#153)

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Sule-Balogun Olanrewaju 2026-01-11 20:14:48 +00:00 • committed by GitHub
commit c0938a19bd
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2 changed files with 605 additions and 55 deletions
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6
src/Server/Builder.php
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@ -87,7 +87,8 @@ final class Builder
* description: ?string,
* annotations: ?ToolAnnotations,
* icons: ?Icon[],
* meta: ?array<string, mixed>
* meta: ?array<string, mixed>,
* outputSchema: ?array<string, mixed>,
* }[]
*/
private array $tools = [];
@ -330,6 +331,7 @@ final class Builder
* @param array<string, mixed>|null $inputSchema
* @param ?Icon[] $icons
* @param array<string, mixed>|null $meta
* @param array<string, mixed>|null $outputSchema
*/
public function addTool(
callable|array|string $handler,
@ -339,6 +341,7 @@ final class Builder
?array $inputSchema = null,
?array $icons = null,
?array $meta = null,
?array $outputSchema = null,
): self {
$this->tools[] = compact(
'handler',
@ -348,6 +351,7 @@ final class Builder
'inputSchema',
'icons',
'meta',
'outputSchema',
);
return $this;

5
src/Server/Handler/Request/CallToolHandler.php
View file

@ -65,13 +65,16 @@ final class CallToolHandler implements RequestHandlerInterface
$result = $this->referenceHandler->handle($reference, $arguments);
$structuredContent = null;
if (!$result instanceof CallToolResult) {
$result = new CallToolResult($reference->formatResult($result));
$structuredContent = $reference->extractStructuredContent($result);
$result = new CallToolResult($reference->formatResult($result), structuredContent: $structuredContent);
}
$this->logger->debug('Tool executed successfully', [
'name' => $toolName,
'result_type' => \gettype($result),
'structured_content' => $structuredContent,
]);
return new Response($request->getId(), $result);