n8n-workflow-builder-mcp

// Centralized constants for MCP server configuration and protocol // Import package version safely for Jest compatibility let packageVersion = '0.0.0'; try { const pkg = require('../../package.json'); packageVersion = pkg?.version || '0.0.0'; } catch { // Fallback if package.json can't be loaded (e.g., in tests) packageVersion = '0.0.0'; } export const MCP_SERVER_NAME = 'n8n-workflow-builder'; export const MCP_SERVER_VERSION: string = packageVersion; export const MCP_PROTOCOL_VERSION = '1.0'; export const HEADER_MCP_VERSION = 'X-MCP-Version'; // Keep a single fallback for n8n versioning logic if ever needed by callers export const DEFAULT_N8N_VERSION_FALLBACK = '1.104.1'; // Optional: canonical tool names to avoid typos export const ToolNames = { create_workflow: 'create_workflow', list_workflows: 'list_workflows', get_workflow_details: 'get_workflow_details', add_node: 'add_node', edit_node: 'edit_node', delete_node: 'delete_node', add_connection: 'add_connection', add_ai_connections: 'add_ai_connections', compose_ai_workflow: 'compose_ai_workflow', list_available_nodes: 'list_available_nodes', get_n8n_version_info: 'get_n8n_version_info', validate_workflow: 'validate_workflow', connect_main_chain: 'connect_main_chain', fix_rag_warnings: 'fix_rag_warnings', list_template_examples: 'list_template_examples' } as const; export type ToolName = typeof ToolNames[keyof typeof ToolNames]; // Security event types for consistent logging export const SecurityEventTypes = { authentication_failure: 'authentication_failure', rate_limit_exceeded: 'rate_limit_exceeded', validation_failure: 'validation_failure', mcp_request: 'mcp_request', workflow_create: 'workflow_create' } as const; export type SecurityEventType = typeof SecurityEventTypes[keyof typeof SecurityEventTypes]; // Error codes for consistent error responses export const ErrorCodes = { // Authentication errors AUTHENTICATION_REQUIRED: 'AUTHENTICATION_REQUIRED', MISSING_API_KEY: 'MISSING_API_KEY', INVALID_API_KEY: 'INVALID_API_KEY', MISSING_JWT_TOKEN: 'MISSING_JWT_TOKEN', RATE_LIMITED: 'RATE_LIMITED', // Authorization errors PERMISSION_DENIED: 'PERMISSION_DENIED', MISSING_ROLES: 'MISSING_ROLES', UNSUPPORTED_AUTH_TYPE: 'UNSUPPORTED_AUTH_TYPE', // Validation errors VALIDATION_ERROR: 'VALIDATION_ERROR', INVALID_REQUEST_FORMAT: 'INVALID_REQUEST_FORMAT', INVALID_TOOL_PARAMETERS: 'INVALID_TOOL_PARAMETERS', MISSING_REQUIRED_FIELD: 'MISSING_REQUIRED_FIELD', FIELD_TOO_LONG: 'FIELD_TOO_LONG', // Tool execution errors TOOL_NOT_FOUND: 'TOOL_NOT_FOUND', TOOL_EXECUTION_ERROR: 'TOOL_EXECUTION_ERROR', TOOL_DEFINITION_ERROR: 'TOOL_DEFINITION_ERROR', // Server errors INTERNAL_SERVER_ERROR: 'INTERNAL_SERVER_ERROR', ERROR: 'ERROR' } as const; export type ErrorCode = typeof ErrorCodes[keyof typeof ErrorCodes]; // Nodes source configuration // Nodes are now always sourced from the local SQLite catalog (materialized to FS at runtime)