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Example code of nexusphp/mcp-sdk

Informations about the package mcp-sdk

Nexus MCP SDK

PHP Latest Stable Version Unit Tests Static analysis Code style Mutation score

[!IMPORTANT] Pre-v1.0.0. Through 0.x the project ships the single umbrella package nexusphp/mcp-sdk, and minor releases may carry breaking changes until 1.0.0. The stdio transport is implemented. Streamable HTTP lands with the 2026-07-28 migration.

A PHP SDK for the Model Context Protocol (MCP), tracking spec revision 2026-07-28. It provides both sides of an MCP session: a server for exposing tools, resources, and prompts, and a client for connecting to MCP servers over a transport.

This SDK is architected independently of the official PHP MCP SDK. See ROADMAP.md for direction and the path to the 2026-07-28 spec migration.

Requirements

Installation

The SDK runs on AMPHP and Revolt. Its synchronous-looking API is driven by fibers under the hood.

Quickstart

A minimal stdio server exposing one tool:

Run it through MCP Inspector:

See Getting started for the client side and a full walkthrough.

Documentation

Development

See CONTRIBUTING.md for the full workflow.

Contributing

Contributions are welcome. Please read CONTRIBUTING.md and the SECURITY.md.

License

Released under the MIT License.

All versions of mcp-sdk with dependencies

PHP Build Version
Package Version
Requires php Version ^8.4
amphp/amp Version ^3.1
amphp/byte-stream Version ^2.1
amphp/process Version ^2.0
nexusphp/assert Version ^1.1
opis/json-schema Version ^2.6
phpstan/phpdoc-parser Version ^2.3
psr/log Version ^3.0
revolt/event-loop Version ^1.0
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