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Official MCP Swift SDK

Official Swift SDK for Model Context Protocol clients and servers, with Swift Package Manager installation, Swift 6+ support, Apple platform availability, MCP client and server APIs, stdio and HTTP transports, tools, resources, prompts, sampling, authentication, and conformance executables.

by Model Context Protocol·added 2026-06-18·
CLI
HarnessCLI
Review first — review before installing

Open the source and read safety notes before installing.

Safety notes

  • The official Swift SDK is a protocol library; risk comes from your MCP tools, resources, prompts, transports, auth flows, and platform integration.
  • Validate tool inputs, enforce caller permissions, bound file and network access, and sanitize errors before returning MCP responses.
  • HTTP transports and bearer-token validation need authentication, TLS, request limits, token storage review, logging policy, and abuse protection.
  • Apple platform availability differs across macOS, iOS, tvOS, watchOS, visionOS, and Mac Catalyst; test the exact targets you ship.

Privacy notes

  • Swift MCP clients and servers may expose tool arguments, tool results, resource contents, prompt templates, auth tokens, HTTP metadata, logs, progress events, and errors.
  • Avoid leaking secrets, private files, customer data, internal identifiers, privileged paths, or raw stack traces through schemas, responses, errors, or logs.
  • Document which MCP client, server process, Apple platform, transport, model provider, and logging system can observe each request.

Prerequisites

  • Swift 6.0+ and Xcode 16+ or a compatible Swift Package Manager toolchain.
  • A supported platform target such as macOS, iOS, tvOS, watchOS, visionOS, or Mac Catalyst.
  • A selected MCP transport, such as stdio for local integrations or HTTP for remote servers.
  • Authorization, side-effect, and data-exposure requirements for production tools and resources.

Schema details

Install type
cli
Troubleshooting
No
Source repository stats
Scope
Source repo
Collection metadata
Estimated setup
20 minutes
Difficulty
intermediate
Tool listing metadata
Pricing
free
Disclosure
editorial
Application category
DeveloperApplication
Operating system
Cross-platform
Full copyable content
dependencies: [
    .package(url: "https://github.com/modelcontextprotocol/swift-sdk.git", from: "0.11.0")
]

About this resource

Overview

The official MCP Swift SDK is the Model Context Protocol project's Swift implementation for building MCP clients and servers. It supports Swift Package Manager installation, a library product named MCP, Apple platform targets, and both client and server APIs for the current MCP specification line documented by upstream.

This is a focused fit for Apple-platform tools, macOS developer utilities, Swift server experiments, and agent workflows that need MCP support without leaving the Swift ecosystem.

Swift Package Manager

Add the package dependency:

dependencies: [
    .package(url: "https://github.com/modelcontextprotocol/swift-sdk.git", from: "0.11.0")
]

Then add the product to your target:

.target(
    name: "YourTarget",
    dependencies: [
        .product(name: "MCP", package: "swift-sdk")
    ]
)

MCP Fit

Choose the official Swift SDK when an Apple-platform app, macOS utility, Swift service, or developer tool needs to act as an MCP client or server. The SDK is especially relevant where Swift concurrency, Swift Package Manager, Apple platform availability, or local macOS integration matter.

Production use still requires normal API review. Treat MCP tools as callable API endpoints and resources as model-visible data surfaces.

Core Capabilities

Area Swift SDK Coverage
Product MCP Swift Package Manager library product
Platforms macOS, Mac Catalyst, iOS, watchOS, tvOS, and visionOS availability in Package.swift
Client APIs Connect to MCP servers, list/call tools, read resources, prompts, completions, sampling, roots, and logging
Server APIs Tools, resources, prompts, completions, sampling, elicitations, roots, logging, initialize hook, and shutdown behavior
Transports stdio and HTTP transport coverage in upstream docs
Auth Client credential, authorization code, token provider/storage, private-key JWT, protected-resource metadata, and bearer-token validation docs

Use Cases

  • Build a macOS MCP client or local developer utility in Swift.
  • Add MCP server behavior to a Swift service or Apple-platform tool.
  • Connect Swift apps to local stdio MCP servers.
  • Use HTTP transport for remote MCP servers.
  • Add MCP authentication support to Swift clients or protected resources.
  • Build conformance or testing utilities around the SDK's executable targets.

Source Review

Verified on 2026-06-18:

  • The upstream README identifies the project as the official Swift SDK for Model Context Protocol.
  • The README says the SDK implements both client and server components according to the 2025-11-25 MCP specification.
  • The README documents Swift 6.0+ and Xcode 16+ requirements.
  • The README documents Swift Package Manager installation with the modelcontextprotocol/swift-sdk.git package URL and MCP product.
  • Package.swift declares the package name, MCP library product, Apple platform availability, Swift tools version, transport/auth-related dependencies, and conformance executable targets.
  • The license file documents the MCP project's license transition terms for Apache-2.0, MIT, and CC-BY-4.0 documentation contributions.

Safety and Privacy

Swift MCP clients and servers may run in user-facing apps or local macOS tools, where privacy expectations are high. Keep resources narrow, validate inputs, check user intent before side effects, and avoid logging secrets or private resource contents.

For HTTP and authentication flows, review token storage, bearer-token validation, TLS, request limits, error handling, and platform-specific logging before production use.

Duplicate Check

Checked current content/mcp/, content/tools/, content/skills/, open pull requests, and repository-wide content for modelcontextprotocol/swift-sdk, official MCP Swift SDK, Model Context Protocol Swift SDK, Swift MCP server SDK, Swift MCP client SDK, Swift Package Manager MCP, Apple MCP SDK, MCP Swift HTTP transport, and MCP Swift authentication. No dedicated official Swift SDK entry, exact source URL duplicate, target file, or open duplicate PR was found.

#swift#mcp#sdk#apple#spm#official

Source citations

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How it compares

Official MCP Swift SDK side by side with 3 alternatives on trust, install, platform support, and disclosed safety notes — all from reviewed registry metadata.

FieldOfficial MCP Swift SDK

Official Swift SDK for Model Context Protocol clients and servers, with Swift Package Manager installation, Swift 6+ support, Apple platform availability, MCP client and server APIs, stdio and HTTP transports, tools, resources, prompts, sampling, authentication, and conformance executables.

Open dossier 		Official MCP Python SDK

Official Python SDK for Model Context Protocol clients and servers, published as the `mcp` package on PyPI, with FastMCP server helpers, client support, tools, resources, prompts, stdio, SSE, Streamable HTTP, authentication, elicitation, sampling, logging, and standalone development tools.

Open dossier 		Official MCP Java SDK

Official Java SDK for Model Context Protocol clients and servers, maintained in collaboration with Spring AI, with Java 17+ support, Maven artifacts, synchronous and asynchronous APIs, Reactive Streams, Project Reactor, JDK HttpClient, Servlet transport, JSON binding modules, and conformance tests.

Open dossier 		Official MCP Ruby SDK

Official Ruby SDK for Model Context Protocol clients and servers, published as the `mcp` gem with JSON-RPC handling, tool, prompt, and resource registration, stdio and Streamable HTTP transports, Rack/Rails integration, roots, sampling, elicitation, logging, cancellation, pagination, and RubyGems metadata.

Open dossier
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Categorytoolstoolstoolstools
Sourcesource-backedsource-backedsource-backedsource-backed
AuthorModel Context ProtocolModel Context ProtocolModel Context ProtocolModel Context Protocol
Added2026-06-182026-06-182026-06-182026-06-18
Platforms
CLI
CLI
CLI
CLI
Source repo————
Safety notes✓The official Swift SDK is a protocol library; risk comes from your MCP tools, resources, prompts, transports, auth flows, and platform integration. Validate tool inputs, enforce caller permissions, bound file and network access, and sanitize errors before returning MCP responses. HTTP transports and bearer-token validation need authentication, TLS, request limits, token storage review, logging policy, and abuse protection. Apple platform availability differs across macOS, iOS, tvOS, watchOS, visionOS, and Mac Catalyst; test the exact targets you ship.✓The official Python SDK is a protocol library; risk comes from the tools, resources, prompts, transports, auth flows, and server process you build with it. Validate all tool inputs, enforce caller permissions, bound file and network access, and sanitize errors before returning them to an MCP client. HTTP, SSE, and ASGI deployments need authentication, TLS, CORS review, host/path routing controls, request limits, logging policy, and abuse protection. The upstream README says v2 is alpha; production projects should stay on the stable v1 line unless they intentionally pin and test a pre-release.✓The official Java SDK is a protocol library; production risk comes from your MCP tools, resources, prompts, transports, authorization hooks, and framework integration. Validate tool inputs, enforce caller permissions, bound side effects, and avoid returning raw Java exceptions or internal stack details to MCP clients. Servlet, Spring, and remote transport deployments need authentication, TLS, request limits, observability policy, cancellation behavior, and abuse protection. Spring AI MCP security and annotation support may simplify integration, but application owners still need to review authorization, tenant boundaries, and data retention.✓The official Ruby SDK is a protocol library; risk comes from your registered tools, resources, prompts, transports, session handling, and framework integration. Validate tool arguments, enforce caller permissions, bound file and network access, and sanitize exceptions before returning MCP responses. The upstream README warns that Streamable HTTP session and SSE state are in memory by default; multi-process Rack/Rails deployments need stateless mode or sticky sessions. Rails controller integrations that create servers per request should review user context, tool selection, and request-specific authorization carefully.
Privacy notes✓Swift MCP clients and servers may expose tool arguments, tool results, resource contents, prompt templates, auth tokens, HTTP metadata, logs, progress events, and errors. Avoid leaking secrets, private files, customer data, internal identifiers, privileged paths, or raw stack traces through schemas, responses, errors, or logs. Document which MCP client, server process, Apple platform, transport, model provider, and logging system can observe each request.✓MCP Python servers may expose local files, application data, tool arguments, tool results, resource contents, prompt templates, authentication state, logs, traces, and errors. Do not leak secrets, customer data, private paths, internal identifiers, token values, or privileged resource contents through schemas, examples, responses, or logs. Document which MCP client, model provider, server process, transport, ASGI layer, and observability system can observe each request.✓Java MCP clients and servers may expose tool arguments, tool results, resource contents, prompt templates, request metadata, correlation IDs, logs, traces, and authorization context. Avoid leaking secrets, customer data, private resources, internal identifiers, stack traces, privileged paths, or token values through schemas, responses, errors, or logs. Document which MCP client, server process, Java framework, model provider, transport, and observability system can observe each request.✓Ruby MCP clients and servers may expose tool arguments, tool results, resource contents, prompt templates, request context, session IDs, logs, progress events, exceptions, and filesystem roots. Avoid leaking secrets, customer data, private files, internal identifiers, stack traces, privileged paths, or session contents through schemas, responses, errors, or logs. Document which MCP client, Ruby process, Rack/Rails layer, session store, model provider, transport, and logging system can observe each request.
Prerequisites
  • Swift 6.0+ and Xcode 16+ or a compatible Swift Package Manager toolchain.
  • A supported platform target such as macOS, iOS, tvOS, watchOS, visionOS, or Mac Catalyst.
  • A selected MCP transport, such as stdio for local integrations or HTTP for remote servers.
  • Authorization, side-effect, and data-exposure requirements for production tools and resources.
  • Python 3.10 or newer and a project managed with uv, pip, or another Python package manager.
  • A decision between stable v1 usage and explicit v2 alpha testing with a pinned pre-release.
  • A target transport, such as stdio for local tools or Streamable HTTP for hosted MCP servers.
  • Clear authorization, side-effect, and data-exposure boundaries for production tools and resources.
  • Java 17 or newer and a Maven or Gradle build configured for the selected SDK artifact version.
  • A choice of core Java SDK usage, Spring AI MCP integration, or both.
  • A target transport, such as stdio, JDK HttpClient, Servlet, WebFlux, WebMVC, or another framework path.
  • Authentication, authorization, and data-exposure requirements for production clients and servers.
  • Ruby project compatible with the gem's required Ruby version and runtime dependencies.
  • A decision between local stdio integration, Rack/Rails Streamable HTTP, or client-side MCP usage.
  • A session strategy for Streamable HTTP when using Rack-compatible frameworks.
  • Authorization, side-effect, and data-exposure requirements for production tools and resources.
Install
.package(url: "https://github.com/modelcontextprotocol/swift-sdk.git", from: "0.11.0")
uv add "mcp[cli]"
mvn dependency:get -Dartifact=io.modelcontextprotocol.sdk:mcp:2.0.0
gem install mcp
Config————
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