Nx MCP Server

import { getNxWorkspacePath } from '@nx-console/vscode-configuration'; import { existsSync, readFileSync, writeFileSync } from 'fs'; import { parse } from 'jsonc-parser'; import * as path from 'path'; import { isInCursor } from './editor-name-helpers'; /** * Gets the path to the mcp.json file. * @returns The path to the mcp.json file or null if the workspace path cannot be determined. */ export function getMcpJsonPath(): string | null { const vscodeWorkspacePath = getNxWorkspacePath(); if (!vscodeWorkspacePath) { return null; } if (isInCursor()) { // If in cursor, use the .cursor directory return path.join(vscodeWorkspacePath, '.cursor', 'mcp.json'); } // else if (isInWindsurf()) { // TODO: do once windsurf supports project-level mcp servers // } else { // If not in cursor, use the workspace root return path.join(vscodeWorkspacePath, '.vscode', 'mcp.json'); } } /** * Checks if the nx-mcp entry exists in the mcp.json file. * @returns true if the entry exists, false otherwise. */ export function hasNxMcpEntry(): boolean { const mcpJsonPath = getMcpJsonPath(); if (!mcpJsonPath || !existsSync(mcpJsonPath)) { return false; } try { const mcpJson = parse(readFileSync(mcpJsonPath, 'utf8')); return !!(mcpJson.mcpServers?.['nx-mcp'] ?? mcpJson.servers?.['nx-mcp']); } catch (e) { return false; } } /** * Reads the mcp.json file. * @returns The parsed content of the mcp.json file or null if it doesn't exist or can't be parsed. */ export function readMcpJson(): any | null { const mcpJsonPath = getMcpJsonPath(); if (!mcpJsonPath || !existsSync(mcpJsonPath)) { return null; } try { const fileContent = readFileSync(mcpJsonPath, 'utf8'); if (fileContent.trim() === '') { return {}; } return parse(fileContent); } catch (error) { console.error('Error reading mcp.json:', error); return null; } } /** * Writes content to the mcp.json file. * @param content The content to write to the file. * @returns true if successful, false otherwise. */ export function writeMcpJson(content: any): boolean { const mcpJsonPath = getMcpJsonPath(); if (!mcpJsonPath) { return false; } try { writeFileSync(mcpJsonPath, JSON.stringify(content, null, 2), 'utf8'); return true; } catch (error) { console.error('Error writing to mcp.json:', error); return false; } }