MCP reference servers v2.0.0: modern-era refactor across TS and Python

The official MCP reference servers hit v2.0.0: all TypeScript servers (everything, filesystem, memory, sequential-thinking) were migrated to TS SDK v2 and the modern-era spec, while Python servers (fetch, git, time) were rebuilt on the Python SDK's high-level MCPServer with proper JSON-RPC error codes, prompts/resources capabilities, and structuredContent/outputSchema for time. Legacy clients remain supported.

# Run the modern-era reference MCP filesystem server
npx -y @modelcontextprotocol/server-filesystem@2.0.0 /path/to/allowed/dir

# Or the Python time server with structured output support
pip install mcp-server-time==2026.10.19
python -m mcp_server_time

{
  "tools": [
    "filesystem",
    "memory",
    "sequential-thinking",
    "everything",
    "fetch",
    "git",
    "time"
  ],
  "transport": "stdio",
  "server_name": "@modelcontextprotocol/server-filesystem"
}