mcp / sdk
Model Context Protocol SDK for Client and Server applications in PHP
Requires
- php: ^8.1
- ext-fileinfo: *
- opis/json-schema: ^2.4
- phpdocumentor/reflection-docblock: ^5.6
- psr/container: ^2.0
- psr/event-dispatcher: ^1.0
- psr/log: ^1.0 || ^2.0 || ^3.0
- symfony/finder: ^6.4 || ^7.3
- symfony/uid: ^6.4 || ^7.3
Requires (Dev)
- php-cs-fixer/shim: ^3.84
- phpstan/phpstan: ^2.1
- phpunit/phpunit: ^10.5
- psr/cache: ^3.0
- symfony/console: ^6.4 || ^7.3
- symfony/process: ^6.4 || ^7.3
This package is auto-updated.
Last update: 2025-09-04 21:58:34 UTC
README
The official PHP SDK for Model Context Protocol (MCP). It provides a framework-agnostic API for implementing MCP servers in PHP.
Important
Currently, we are still in the process of merging Symfony's MCP SDK and PHP-MCP components. Not all code paths are fully tested, complete, or this package may contain duplicate functionality or dead code.
If you want to help us stabilize the SDK, please see the issue tracker.
This project is a collaboration between the PHP Foundation and the Symfony project. It adopts development practices and standards from the Symfony project, including Coding Standards and the Backward Compatibility Promise.
Until the first major release, this SDK is considered experimental.
🚧 Roadmap
Features
- bring back php-mcp examples
- Glue handler, registry and reference handlers
- Revive
ServerBuilder
- Revive transports
- Support pagination
- Support Schema validation
- Support Multiple Versions of MCP Specification #14
- (Re-)Implement missing Notification & Request Handlers #9
Examples working
- 01-discovery-stdio-calculator
- 02-discovery-http-userprofile
- 03-manual-registration-stdio
- 04-combined-registration-http
- 05-stdio-env-variables
- 06-custom-dependencies-stdio
- 07-complex-tool-schema-http
- 08-schema-showcase-streamable
- 09-standalone-cli
Installation
composer require mcp/sdk
Since this package has no tagged releases yet, it is required to extend your composer.json
:
"minimum-stability": "dev", "prefer-stable": true
âš¡ Quick Start: Stdio Server with Discovery
This example demonstrates the most common usage pattern - a stdio
server using attribute discovery.
1. Define Your MCP Elements
Create src/CalculatorElements.php
:
<?php namespace App; use Mcp\Capability\Attribute\McpTool; class CalculatorElements { #[McpTool(name: 'add_numbers')] public function add(int $a, int $b): int { return $a + $b; } }
2. Create the Server Script
Create mcp-server.php
:
#!/usr/bin/env php <?php declare(strict_types=1); require_once __DIR__ . '/vendor/autoload.php'; use Mcp\Server; use Mcp\Server\Transport\StdioTransport; Server::make() ->withServerInfo('Stdio Calculator', '1.1.0', 'Basic Calculator over STDIO transport.') ->withDiscovery(__DIR__, ['.']) ->build() ->connect(new StdioTransport());
3. Configure Your MCP Client
Add to your client configuration (e.g., mcp.json
):
{ "mcpServers": { "php-calculator": { "command": "php", "args": ["/absolute/path/to/your/mcp-server.php"] } } }
4. Test the Server
Your AI assistant can now call:
add_numbers
- Add two integers
Documentation
- SDK documentation
- Model Context Protocol documentation
- Model Context Protocol specification
- Officially supported servers
Examples of MCP Tools that use this SDK
Contributing
We are passionate about supporting contributors of all levels of experience and would love to see you get involved in the project. See the contributing guide to get started before you report issues and send pull requests.
Credits
The starting point for this SDK was PHP-MCP project, initiated by Kyrian Obikwelu. We are grateful for the work done by Kyrian and other contributors to that repository, which created a solid foundation for this SDK.
License
This project is licensed under the MIT License - see the LICENSE file for details.