MCP100 verdict
Not currently recommended. Official framework-agnostic PHP MCP SDK for implementing clients and servers. Capabilities: Build MCP servers; Build MCP clients; Expose tools, resources and prompts; Use STDIO and HTTP transports, sessions and authorization features documented by the SDK
MCP100 Assessment
Editorial verdict
Reviewed October 21, 2026
Task Fit
Mapped
Developer workflows
Trust
Status warning
maintenance_source_health; install_supply_chain; advisory_freshness; adoption_evidence_presence; resource_type_requirements
Maintenance
Date unavailable
No dated repository or package update is currently stored.
Popularity
Signals unavailable
No independently comparable adoption metric is currently stored.
Evidence scope
1.6k shared-repository stars · not MCP-specific
No MCP-specific package metric is stored
Repository identity: modelcontextprotocol/php-sdk
Package identity: mcp/sdk
Stars observed October 21, 2026 · Downloads observed October 21, 2026
Repository evidence: exact_resource_repo. Not MCP-specific/comparable for MCP-server adoption. Keep as SDK/resource, not an MCP server. Current official package is Composer `mcp/sdk`; the SDK is experimental until 1.0. Packagist currently lists a security advisory, so dependency/security review should remain explicit. Resource popularity must not enter MCP-server adoption ordering.
Package evidence: exact_sdk_package_no_comparable_download_metric. Not MCP-specific/comparable for MCP-server adoption. No attributable public download metric was verified. Keep as SDK/resource, not an MCP server. Current official package is Composer `mcp/sdk`; the SDK is experimental until 1.0. Packagist currently lists a security advisory, so dependency/security review should remain explicit. Resource popularity must not enter MCP-server adoption ordering.
Publisher activity observed October 21, 2026
Current source snapshot
Source relationship: First-party MCP
Reviewed October 21, 2026
Evidence-backed setup
This profile has type-appropriate, source-backed setup rather than an MCP-server client connector configuration.
Type-appropriate, source-backed setup for this sdk profile.
Capability
Official framework-agnostic PHP MCP SDK for implementing clients and servers. Capabilities: Build MCP servers; Build MCP clients; Expose tools, resources and prompts; Use STDIO and HTTP transports, sessions and authorization features documented by the SDK
Not measured yet
Estimated token footprint of the MCP tool schemas exposed to the agent.
Reviewed access
Review the exact access boundary before connecting this MCP to accounts, credentials, or sensitive data.
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Work with repositories, issues, pull requests, and GitHub workflows.
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Choose GitHub MCP instead if repository, issue, pull-request, and code context.
Work with repositories, issues, pull requests, and GitHub workflows.
github:modelcontextprotocol is listed as First-party MCP in MCP100’s current evidence.
Current official resources:
Original product, capability, tool, and usage documentation from the MCP publisher. Installation sections appear under Install & Agents.
The official PHP SDK for the Model Context Protocol (MCP). It provides a framework-agnostic API for implementing MCP
servers and clients in PHP — tools, resources, prompts, STDIO and HTTP transports, sessions, authorization, and both
protocol eras (the initialize handshake and the stateless 2026-07-28 revision).
This project represents 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, please see the roadmap for planned next steps and features.
Measured weekly against the MCP Conformance Test Framework,
as passing checks out of total. The 2026-07-28 scores run against the framework's alpha releases, so they move as
upstream publishes new scenarios.
A server is a plain PHP class plus three lines of wiring:
use Mcp\Capability\Attribute\McpResource;
use Mcp\Capability\Attribute\McpTool;
use Mcp\Server;
use Mcp\Server\Transport\StdioTransport;
class Calculator
{
/**
* Adds two numbers.
*/
#[McpTool]
public function add(int $a, int $b): int
{
return $a + $b;
}
#[McpResource(uri: 'config://calculator/settings')]
public function settings(): array
{
return ['precision' => 2];
}
}
exit(Server::builder()
->setServerInfo('Calculator', '1.0.0')
->setDiscovery(__DIR__, ['.'], excludeDirs: ['vendor'])
->build()
->run(new StdioTransport()));
The setDiscovery() call needs symfony/finder:
composer require symfony/finder
The walkthrough in First server explains each piece, and Try it with the Inspector shows it running.
use Mcp\Client;
use Mcp\Client\Transport\StdioTransport;
$client = Client::builder()
->setClientInfo('My Application', '1.0.0')
->build();
$client->connect(new StdioTransport(command: 'php', args: ['/path/to/server.php']));
$tools = $client->listTools();
$result = $client->callTool('add', ['a' => 5, 'b' => 3]);
$client->disconnect();
See Transports for STDIO and HTTP, Connecting to a server for timeouts, and Server-initiated requests for the handlers that answer requests from the server.
The full documentation is published at php.sdk.modelcontextprotocol.io.
2026-07-28 changedBuilding something on top of the SDK? Open a pull request to add it to this list.
We are passionate about supporting contributors of all levels of experience and would love to see you get involved in the project. Start by reporting issues or sending pull requests. See CONTRIBUTING.md for development setup, coding standards, and what to run before opening a PR.
The starting point for this SDK was the PHP-MCP project, initiated by Kyrian Obikwelu, and the Symfony AI initiative. We are grateful for the work done by both projects and their contributors, which created a solid foundation for this SDK.
This project is licensed under the Apache License, Version 2.0 for new contributions, with existing code under the MIT License — see the LICENSE file for details.