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elliottlawson/mcp-php-sdk
=========================

PHP SDK for Model Context Protocol

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MCP PHP SDK
===========

[](#mcp-php-sdk)

A PHP SDK for the Model Context Protocol (MCP), allowing seamless integration between applications and Large Language Models (LLMs).

Requirements
------------

[](#requirements)

- PHP 8.1 or higher
- Composer

Installation
------------

[](#installation)

```
composer require elliottlawson/mcp-php-sdk
```

Overview
--------

[](#overview)

The Model Context Protocol (MCP) is an open standard for connecting large language models (LLMs) to applications, APIs, and external data sources. This PHP SDK provides a structured implementation for PHP applications to integrate with MCP.

Main Components
---------------

[](#main-components)

### Protocol Layer

[](#protocol-layer)

The Protocol layer handles the core MCP message format and communication patterns:

- `McpMessage`: Represents JSON-RPC 2.0 messages used in MCP
- `Protocol`: Handles message framing, request-response linking, and pattern registration

### Transport Layer

[](#transport-layer)

The Transport layer defines how messages are sent and received:

- `TransportInterface`: Defines the contract for all transport implementations
- `StdioTransport`: Implementation for command-line applications using standard input/output
- `SseTransport`: Implementation for web applications using Server-Sent Events (SSE)

### Resources

[](#resources)

Resources are data sources that LLMs can access:

- `Resource`: Represents a data source
- `ResourceTemplate`: Handles URI templates and pattern matching
- `ResourceContent`: Represents the content of a resource

### Tools

[](#tools)

Tools enable LLMs to execute code and produce side effects:

- `Tool`: Represents a tool definition
- `ToolResult`: Encapsulates the result of a tool execution

### Prompts

[](#prompts)

Prompts define reusable templates for LLM interactions:

- `Prompt`: Represents a prompt definition
- `PromptArgument`: Defines arguments for prompts
- `PromptResult`: Represents the result of a prompt execution

### Server

[](#server)

The server components tie everything together:

- `McpServer`: The main server class that manages connections, resources, tools, and prompts
- `ServerCapabilities`: Defines the capabilities of the server

Quick Start
-----------

[](#quick-start)

### Basic CLI Server

[](#basic-cli-server)

```