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A Dart plugin for implementing Model Context Protocol (MCP) servers. This plugin allows Flutter applications to expose data, functionality, and interaction patterns to Large Language Model (LLM)...

概要

A Dart plugin for implementing Model Context Protocol (MCP) servers. This plugin allows Flutter applications to expose data, functionality, and interaction patterns to Large Language Model (LLM) applications in a standardized way. - , 2024-11-05 through 2026-07-28, plus the 2026-07-28 tasks extension — see Protocol Versions below - — Resources, Tools, Prompts, plus Completions (2025-06-18+) - — requestClientSampling, requestClientRoots, requestClientElicitation with response routing and timeout - — every HTTP request is decided before dispatch (401 / 403 with WWW-Authenticate), Protected Resource Metadata (RFC 9728), audience and scope checks - (2025-06-18) — outputSchema + structuredContent + resource_link content type - (2025-11-25) — Tool.icons / Resource.icons / Prompt.

README

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MCP Server

A Dart plugin for implementing Model Context Protocol (MCP) servers. This plugin allows Flutter applications to expose data, functionality, and interaction patterns to Large Language Model (LLM) applications in a standardized way.

Features

  • Every MCP revision, 2024-11-05 through 2026-07-28, plus the 2026-07-28 tasks extension — see Protocol Versions below
  • Core primitives — Resources, Tools, Prompts, plus Completions (2025-06-18+)
  • Server-initiated requests — requestClientSampling, requestClientRoots, requestClientElicitation with response routing and timeout
  • Authorization — every HTTP request is decided before dispatch (401 / 403 with WWW-Authenticate), Protected Resource Metadata (RFC 9728), audience and scope checks
  • Structured tool output (2025-06-18) — outputSchema + structuredContent + resource_link content type
  • Icons + sampling tool calls (2025-11-25) — Tool.icons / Resource.icons / Prompt.icons, plus the new tools / toolChoice fields on sampling/createMessage
  • List-changed notifications — spec-canonical notifications/{tools,resources,prompts}/list_changed
  • Progress + cancellation — outbound notifyProgress; inbound notifications/cancelled and notifications/progress listeners
  • Session events — onConnect / onDisconnect streams, per-session protocol version + capabilities
  • Caching hints (2026-07-28) — ttlMs / cacheScope on discover, lists and reads (cacheTtl, publicLists)
  • Health + metrics — getHealth(), named timers, custom counters
  • Transports — stdio, SSE (legacy), Streamable HTTP (canonical 2025-03-26+)
  • Platforms: wherever dart:io is available (Android, iOS, Linux, Windows, macOS)

Protocol Versions

Implements every revision of the Model Context Protocol; each client gets the one it opens with.

Version Notes
2024-11-05 Original; HTTP+SSE transport
2025-03-26 Streamable HTTP, authorization, JSON-RPC batches
2025-06-18 Elicitation, structured tool output, resource links, MCP-Protocol-Version header; batches removed
2025-11-25 Icons, sampling with tools, URL elicitation, tasks
2026-07-28 Stateless: no handshake, server/discover, per-request _meta, subscriptions/listen, multi round-trip requests, caching hints; tasks extension

initialize negotiates among McpProtocol.supportedVersions (2025-11-25 and earlier). 2026-07-28 has no handshake: on stdio a request naming its version in _meta is served in that revision; over Streamable HTTP it is served on the same endpoint as the session revisions. A server that keeps per-session state sets enableStateless: false (TransportConfig.streamableHttp or StreamableHttpServerConfig), and 2026-07-28 clients fall back to initialize.

Coming from 2.x: MIGRATION-3.0.md.

Tasks

GitHub で README 全文を見る

インストール

This server does not publish a one-line install command.

Open the repository installation guide MCP 初心者？mcpskill.org のガイドから始めましょう →