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Merge pull request #22 from symfony/mcp-bundle-integration
MCP Bundle Integration
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‎src/mcp-bundle/.gitattributes

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/.github export-ignore
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.gitattributes export-ignore
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.gitignore export-ignore
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phpstan.dist.neon export-ignore

‎src/mcp-bundle/.github/PULL_REQUEST_TEMPLATE.md

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Please do not submit any Pull Requests here. They will be closed.
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---
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Please submit your PR here instead:
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https://github.com/symfony/ai
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This repository is what we call a "subtree split": a read-only subset of that main repository.
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We're looking forward to your PR there!

‎src/mcp-bundle/.github/workflows/close-pull-request.yml

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name: Close Pull Request
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on:
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pull_request_target:
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types: [opened]
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jobs:
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run:
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runs-on: ubuntu-latest
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steps:
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- uses: superbrothers/close-pull-request@v3
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with:
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comment: |
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Thanks for your Pull Request! We love contributions.
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However, you should instead open your PR on the main repository:
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https://github.com/symfony/ai
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This repository is what we call a "subtree split": a read-only subset of that main repository.
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We're looking forward to your PR there!

‎src/mcp-bundle/.gitignore

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vendor
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composer.lock
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.php-cs-fixer.cache

‎src/mcp-bundle/LICENSE

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Copyright (c) 2025-present Fabien Potencier
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is furnished
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to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.

‎src/mcp-bundle/README.md

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# MCP Bundle [WIP]
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Symfony integration bundle for [Model Context Protocol](https://modelcontextprotocol.io/) using the Symfony AI
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MCP SDK [symfony/mcp-sdk](https://github.com/symfony/mcp-sdk).
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**Currently only supports tools as server via Server-Sent Events (SSE) and STDIO.**
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## Installation
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```bash
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composer require symfony/mcp-bundle
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```
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## Usage
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At first, you need to decide whether your application should act as a MCP server or client. Both can be configured
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in the `mcp` section of your `config/packages/mcp.yaml` file.
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### Act as Server
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**Currently only supports tools.**
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To use your application as an MCP server, exposing tools to clients like [Claude Desktop](https://claude.ai/download),
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you need to configure in the `client_transports` section the transports you want to expose to clients.
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You can use either STDIO or SSE.
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### Act as Client
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**Not implemented yet.**
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To use your application as an MCP client, integrating other MCP servers, you need to configure the `servers` you want to
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connect to. You can use either STDIO or Server-Sent Events (SSE) as transport methods.
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You can find a list of example Servers in the [MCP Server List](https://modelcontextprotocol.io/examples).
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Tools of those servers are available in your [AI Bundle](https://github.com/symfony/ai-bundle)
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configuration and usable in your agents.
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## Configuration
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```yaml
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mcp:
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app: 'app' # Application name to be exposed to clients
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version: '1.0.0' # Application version to be exposed to clients
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# Configure this application to act as an MCP server
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# Currently exposes tools registered in Symfony AI Bundle
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client_transports:
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stdio: true # Enable STDIO via command
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sse: true # Enable Server-Sent Event via controller
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# Configure MCP servers to be used by this application
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# Not implemented yet
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servers:
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name:
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transport: 'stdio' # Transport method to use, either 'stdio' or 'sse'
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stdio:
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command: 'php /path/bin/console mcp' # Command to execute to start the client
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arguments: [] # Arguments to pass to the command
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sse:
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url: 'http://localhost:8000/sse' # URL to SSE endpoint of MCP server
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```

‎src/mcp-bundle/composer.json

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{
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"name": "symfony/mcp-bundle",
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"type": "symfony-bundle",
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"description": "Symfony integration bundle for Model Context Protocol (via symfony/mcp-sdk)",
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"license": "MIT",
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"authors": [
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{
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"name": "Christopher Hertel",
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"email": "[email protected]"
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}
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],
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"require": {
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"symfony/config": "^6.4 || ^7.0",
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"symfony/console": "^6.4 || ^7.0",
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"symfony/dependency-injection": "^6.4 || ^7.0",
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"symfony/framework-bundle": "^6.4 || ^7.0",
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"symfony/http-foundation": "^6.4 || ^7.0",
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"symfony/http-kernel": "^6.4 || ^7.0",
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"symfony/mcp-sdk": "@dev",
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"symfony/routing": "^6.4 || ^7.0"
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},
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"require-dev": {
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"phpstan/phpstan": "^2.1",
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"phpunit/phpunit": "^11.5"
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},
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"config": {
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"sort-packages": true
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},
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"autoload": {
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"psr-4": {
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"Symfony\\AI\\McpBundle\\": "src/"
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}
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},
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"minimum-stability": "dev",
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"prefer-stable": true,
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"repositories": [
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{ "type": "path", "url": "../mcp-sdk" }
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]
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}

‎src/mcp-bundle/phpstan.dist.neon

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parameters:
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level: 6
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paths:
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- src/
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excludePaths:
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analyse:
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- src/DependencyInjection/Configuration.php

‎src/mcp-bundle/phpunit.xml.dist

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<?xml version="1.0" encoding="UTF-8"?>
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<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.5/phpunit.xsd"
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bootstrap="vendor/autoload.php"
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cacheDirectory=".phpunit.cache"
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colors="true"
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executionOrder="depends,defects"
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requireCoverageMetadata="true"
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beStrictAboutCoverageMetadata="true"
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beStrictAboutOutputDuringTests="true"
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failOnRisky="true"
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failOnWarning="true">
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<testsuites>
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<testsuite name="default">
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<directory>tests</directory>
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</testsuite>
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</testsuites>
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<source ignoreIndirectDeprecations="true" restrictNotices="true" restrictWarnings="true">
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<include>
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<directory>src</directory>
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</include>
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</source>
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</phpunit>

‎src/mcp-bundle/src/Command/McpCommand.php

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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <[email protected]>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\AI\McpBundle\Command;
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use Symfony\AI\McpSdk\Server;
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use Symfony\AI\McpSdk\Server\Transport\Stdio\SymfonyConsoleTransport;
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use Symfony\Component\Console\Attribute\AsCommand;
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use Symfony\Component\Console\Command\Command;
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use Symfony\Component\Console\Input\InputInterface;
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use Symfony\Component\Console\Output\OutputInterface;
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#[AsCommand('mcp:server', 'Starts an MCP server')]
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class McpCommand extends Command
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{
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public function __construct(
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private readonly Server $server,
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) {
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parent::__construct();
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}
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protected function execute(InputInterface $input, OutputInterface $output): int
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{
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$this->server->connect(
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new SymfonyConsoleTransport($input, $output)
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);
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return Command::SUCCESS;
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}
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}

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