MCP for Dart

SDK-only generated projects retain the SDK's Dart 3.4 minimum. CLI projects use Dart 3.12 because the CLI and its toolchain target that release.

Use the latest stable package for production projects:

Pin the stable 2.4 line explicitly when reproducible dependency resolution is important:

The snippets below use the current stable SDK line. Package versions remain separate from protocol profiles:McpProtocol.stablenames the SDK's default compatibility policy.

The SDK and CLI are versioned independently. The stable CLI's^2.3.0constraint remains compatible with the 2.4 SDK.

- MCP servers, clients, and host integrations with null-safe Dart APIs.
- Core tools, resources, prompts, completion, elicitation, subscriptions, logging, roots, and sampling APIs with behavior selected for the negotiated protocol era. MCP 2026-07-28 logging is retained for compatibility but is deprecated upstream.
- Stdio, Streamable HTTP, IO stream, and custom transports.
- OAuth client discovery/PKCE hooks, server authentication callbacks, DNS rebinding protection, and strict Streamable HTTP validation.
- An experimental Tasks extension implementation, MCP Apps metadata helpers, and generic extension negotiation. Extensions are separate from core protocol coverage; Tasks is not an official extension or part of the SDK's core conformance claim.
- Automated MCP 2025-11-25 and MCP 2026-07-28 conformance, bidirectional published TypeScript SDK 2.0.0 interoperability, bidirectional Python SDK 2.0.0 interoperability, real-browser transport tests, a real Flutter Web service integration in Chrome, deterministic widget tests, and an independent pinned JSON Schema Test Suite gate.
- mcp_dart 2.4.1hardens Streamable HTTP access and JSON-RPC error diagnostics and retains the deprecated, opt-in legacy HTTP+SSE client with same-origin routing and bidirectional interoperability against official TypeScript SDK 1.30.0 and Python SDK 2.0.0 peers.

MCP has three roles: a host owns the user experience, a client connects that host to one server, and a server exposes tools, resources, and prompts. A host can manage multiple clients and servers.

UsestableProtocolVersionordefaultProtocolVersionfor MCP2026-07-28.previewProtocolVersionremains as a deprecated alias for applications built against a 2.3 prerelease.latestInitializationProtocolVersionremains2025-11-25when the default profile falls back to the legacy lifecycle. For compatibility,latestProtocolVersionandsupportedProtocolVersionsretain their mcp_dart 2.2 initialization-era values; useallSupportedProtocolVersionsfor the dual-era list.

Select a profile only when you need to constrain negotiation:

final legacyClient = McpClient( const Implementation(name: 'my-client', version: '1.0.0'), options: const McpClientOptions(protocol: McpProtocol.legacy), ); final strict2026Server = McpServer( const Implementation(name: 'my-server', version: '1.0.0'), options: const McpServerOptions(protocol: McpProtocol.require2026), );

dart pub global activate mcp_dart_cli 0.2.0 mcp_dart create my_server cd my_server mcp_dart inspect

The0.2.0CLI creates a project withmcp_dart: ^2.3.0. The inspector launches the generated stdio server itself. After leaving the interactive inspector, you can run a single tool directly:

mcp_dart inspect --tool add --json-args '{"a": 1, "b": 2}'

Standalone integration examples may declare newer Dart SDK requirements; check each example README before running it.

StreamableHttpClientTransportsupportsOAuthClientProviderand optional authorization-code discovery. Servers can useauthenticatororauthenticationHandlerand publish protected-resource metadata.

Legacy HTTP+SSE is deprecated under MCP SEP-2596 and is retained only for explicit compatibility. Use Streamable HTTP for new remote integrations.

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