feat: add configurable MCP tool loading to reduce LLM context usage (#1181)
Co-authored-by: Ralph Khreish <35776126+Crunchyman-ralph@users.noreply.github.com>
This commit is contained in:
Karol Fabjańczuk
410
tests/unit/mcp/tools/tool-registration.test.js
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410
tests/unit/mcp/tools/tool-registration.test.js
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/**
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* tool-registration.test.js
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* Comprehensive unit tests for the Task Master MCP tool registration system
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* Tests environment variable control system covering all configuration modes and edge cases
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*/
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import {
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describe,
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it,
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expect,
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beforeEach,
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afterEach,
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jest
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} from '@jest/globals';
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import {
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EXPECTED_TOOL_COUNTS,
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EXPECTED_CORE_TOOLS,
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validateToolCounts,
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validateToolStructure
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} from '../../../helpers/tool-counts.js';
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import { registerTaskMasterTools } from '../../../../mcp-server/src/tools/index.js';
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import {
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toolRegistry,
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coreTools,
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standardTools
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} from '../../../../mcp-server/src/tools/tool-registry.js';
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// Derive constants from imported registry to avoid brittle magic numbers
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const ALL_COUNT = Object.keys(toolRegistry).length;
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const CORE_COUNT = coreTools.length;
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const STANDARD_COUNT = standardTools.length;
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describe('Task Master Tool Registration System', () => {
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let mockServer;
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let originalEnv;
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beforeEach(() => {
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originalEnv = process.env.TASK_MASTER_TOOLS;
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mockServer = {
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tools: [],
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addTool: jest.fn((tool) => {
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mockServer.tools.push(tool);
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return tool;
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})
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};
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delete process.env.TASK_MASTER_TOOLS;
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});
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afterEach(() => {
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if (originalEnv !== undefined) {
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process.env.TASK_MASTER_TOOLS = originalEnv;
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} else {
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delete process.env.TASK_MASTER_TOOLS;
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}
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jest.clearAllMocks();
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});
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describe('Test Environment Setup', () => {
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it('should have properly configured mock server', () => {
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expect(mockServer).toBeDefined();
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expect(typeof mockServer.addTool).toBe('function');
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expect(Array.isArray(mockServer.tools)).toBe(true);
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expect(mockServer.tools.length).toBe(0);
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});
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it('should have correct tool registry structure', () => {
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const validation = validateToolCounts();
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expect(validation.isValid).toBe(true);
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if (!validation.isValid) {
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console.error('Tool count validation failed:', validation);
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}
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expect(validation.actual.total).toBe(EXPECTED_TOOL_COUNTS.total);
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expect(validation.actual.core).toBe(EXPECTED_TOOL_COUNTS.core);
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expect(validation.actual.standard).toBe(EXPECTED_TOOL_COUNTS.standard);
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});
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it('should have correct core tools', () => {
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const structure = validateToolStructure();
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expect(structure.isValid).toBe(true);
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if (!structure.isValid) {
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console.error('Tool structure validation failed:', structure);
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}
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expect(coreTools).toEqual(expect.arrayContaining(EXPECTED_CORE_TOOLS));
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expect(coreTools.length).toBe(EXPECTED_TOOL_COUNTS.core);
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});
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it('should have correct standard tools that include all core tools', () => {
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const structure = validateToolStructure();
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expect(structure.details.coreInStandard).toBe(true);
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expect(standardTools.length).toBe(EXPECTED_TOOL_COUNTS.standard);
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coreTools.forEach((tool) => {
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expect(standardTools).toContain(tool);
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});
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});
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it('should have all expected tools in registry', () => {
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const expectedTools = [
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'initialize_project',
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'models',
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'research',
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'add_tag',
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'delete_tag',
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'get_tasks',
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'next_task',
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'get_task'
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];
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expectedTools.forEach((tool) => {
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expect(toolRegistry).toHaveProperty(tool);
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});
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});
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});
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describe('Configuration Modes', () => {
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it(`should register all tools (${ALL_COUNT}) when TASK_MASTER_TOOLS is not set (default behavior)`, () => {
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delete process.env.TASK_MASTER_TOOLS;
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registerTaskMasterTools(mockServer);
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expect(mockServer.addTool).toHaveBeenCalledTimes(
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EXPECTED_TOOL_COUNTS.total
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);
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});
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it(`should register all tools (${ALL_COUNT}) when TASK_MASTER_TOOLS=all`, () => {
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process.env.TASK_MASTER_TOOLS = 'all';
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registerTaskMasterTools(mockServer);
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expect(mockServer.addTool).toHaveBeenCalledTimes(ALL_COUNT);
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});
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it(`should register exactly ${CORE_COUNT} core tools when TASK_MASTER_TOOLS=core`, () => {
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process.env.TASK_MASTER_TOOLS = 'core';
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registerTaskMasterTools(mockServer, 'core');
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expect(mockServer.addTool).toHaveBeenCalledTimes(
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EXPECTED_TOOL_COUNTS.core
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);
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});
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it(`should register exactly ${STANDARD_COUNT} standard tools when TASK_MASTER_TOOLS=standard`, () => {
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process.env.TASK_MASTER_TOOLS = 'standard';
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registerTaskMasterTools(mockServer, 'standard');
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expect(mockServer.addTool).toHaveBeenCalledTimes(
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EXPECTED_TOOL_COUNTS.standard
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);
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});
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it(`should treat lean as alias for core mode (${CORE_COUNT} tools)`, () => {
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process.env.TASK_MASTER_TOOLS = 'lean';
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registerTaskMasterTools(mockServer, 'lean');
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expect(mockServer.addTool).toHaveBeenCalledTimes(CORE_COUNT);
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});
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it('should handle case insensitive configuration values', () => {
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process.env.TASK_MASTER_TOOLS = 'CORE';
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registerTaskMasterTools(mockServer, 'CORE');
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expect(mockServer.addTool).toHaveBeenCalledTimes(CORE_COUNT);
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});
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});
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describe('Custom Tool Selection and Edge Cases', () => {
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it('should register specific tools from comma-separated list', () => {
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process.env.TASK_MASTER_TOOLS = 'get_tasks,next_task,get_task';
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registerTaskMasterTools(mockServer, 'get_tasks,next_task,get_task');
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expect(mockServer.addTool).toHaveBeenCalledTimes(3);
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});
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it('should handle mixed valid and invalid tool names gracefully', () => {
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process.env.TASK_MASTER_TOOLS =
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'invalid_tool,get_tasks,fake_tool,next_task';
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registerTaskMasterTools(
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mockServer,
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'invalid_tool,get_tasks,fake_tool,next_task'
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);
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expect(mockServer.addTool).toHaveBeenCalledTimes(2);
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});
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it('should default to all tools with completely invalid input', () => {
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process.env.TASK_MASTER_TOOLS = 'completely_invalid';
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registerTaskMasterTools(mockServer);
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expect(mockServer.addTool).toHaveBeenCalledTimes(ALL_COUNT);
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});
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it('should handle empty string environment variable', () => {
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process.env.TASK_MASTER_TOOLS = '';
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registerTaskMasterTools(mockServer);
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expect(mockServer.addTool).toHaveBeenCalledTimes(ALL_COUNT);
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});
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it('should handle whitespace in comma-separated lists', () => {
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process.env.TASK_MASTER_TOOLS = ' get_tasks , next_task , get_task ';
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registerTaskMasterTools(mockServer, ' get_tasks , next_task , get_task ');
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expect(mockServer.addTool).toHaveBeenCalledTimes(3);
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});
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it('should ignore duplicate tools in list', () => {
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process.env.TASK_MASTER_TOOLS = 'get_tasks,get_tasks,next_task,get_tasks';
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registerTaskMasterTools(
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mockServer,
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'get_tasks,get_tasks,next_task,get_tasks'
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);
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expect(mockServer.addTool).toHaveBeenCalledTimes(2);
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});
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it('should handle only commas and empty entries', () => {
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process.env.TASK_MASTER_TOOLS = ',,,';
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registerTaskMasterTools(mockServer);
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expect(mockServer.addTool).toHaveBeenCalledTimes(ALL_COUNT);
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});
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it('should handle single tool selection', () => {
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process.env.TASK_MASTER_TOOLS = 'get_tasks';
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registerTaskMasterTools(mockServer, 'get_tasks');
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expect(mockServer.addTool).toHaveBeenCalledTimes(1);
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});
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});
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describe('Coverage Analysis and Integration Tests', () => {
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it('should provide 100% code coverage for environment control logic', () => {
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const testCases = [
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{
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env: undefined,
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expectedCount: ALL_COUNT,
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description: 'undefined env (all)'
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},
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{
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env: '',
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expectedCount: ALL_COUNT,
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description: 'empty string (all)'
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},
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{ env: 'all', expectedCount: ALL_COUNT, description: 'all mode' },
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{ env: 'core', expectedCount: CORE_COUNT, description: 'core mode' },
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{
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env: 'lean',
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expectedCount: CORE_COUNT,
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description: 'lean mode (alias)'
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},
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{
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env: 'standard',
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expectedCount: STANDARD_COUNT,
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description: 'standard mode'
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},
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{
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env: 'get_tasks,next_task',
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expectedCount: 2,
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description: 'custom list'
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},
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{
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env: 'invalid_tool',
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expectedCount: ALL_COUNT,
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description: 'invalid fallback'
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}
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];
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testCases.forEach((testCase) => {
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delete process.env.TASK_MASTER_TOOLS;
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if (testCase.env !== undefined) {
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process.env.TASK_MASTER_TOOLS = testCase.env;
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}
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mockServer.tools = [];
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mockServer.addTool.mockClear();
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registerTaskMasterTools(mockServer, testCase.env || 'all');
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expect(mockServer.addTool).toHaveBeenCalledTimes(
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testCase.expectedCount
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);
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});
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});
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it('should have optimal performance characteristics', () => {
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const startTime = Date.now();
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process.env.TASK_MASTER_TOOLS = 'all';
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registerTaskMasterTools(mockServer);
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const endTime = Date.now();
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const executionTime = endTime - startTime;
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expect(executionTime).toBeLessThan(100);
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expect(mockServer.addTool).toHaveBeenCalledTimes(ALL_COUNT);
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});
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it('should validate token reduction claims', () => {
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expect(coreTools.length).toBeLessThan(standardTools.length);
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expect(standardTools.length).toBeLessThan(
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Object.keys(toolRegistry).length
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);
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expect(coreTools.length).toBe(CORE_COUNT);
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expect(standardTools.length).toBe(STANDARD_COUNT);
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expect(Object.keys(toolRegistry).length).toBe(ALL_COUNT);
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const allToolsCount = Object.keys(toolRegistry).length;
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const coreReduction =
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((allToolsCount - coreTools.length) / allToolsCount) * 100;
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const standardReduction =
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((allToolsCount - standardTools.length) / allToolsCount) * 100;
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expect(coreReduction).toBeGreaterThan(80);
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expect(standardReduction).toBeGreaterThan(50);
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});
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it('should maintain referential integrity of tool registry', () => {
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coreTools.forEach((tool) => {
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expect(standardTools).toContain(tool);
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});
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standardTools.forEach((tool) => {
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expect(toolRegistry).toHaveProperty(tool);
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});
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Object.keys(toolRegistry).forEach((tool) => {
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expect(typeof toolRegistry[tool]).toBe('function');
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});
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});
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it('should handle concurrent registration attempts', () => {
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process.env.TASK_MASTER_TOOLS = 'core';
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registerTaskMasterTools(mockServer, 'core');
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registerTaskMasterTools(mockServer, 'core');
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registerTaskMasterTools(mockServer, 'core');
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expect(mockServer.addTool).toHaveBeenCalledTimes(CORE_COUNT * 3);
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});
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it('should validate all documented tool categories exist', () => {
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const allTools = Object.keys(toolRegistry);
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const projectSetupTools = allTools.filter((tool) =>
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['initialize_project', 'models', 'rules', 'parse_prd'].includes(tool)
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);
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expect(projectSetupTools.length).toBeGreaterThan(0);
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const taskManagementTools = allTools.filter((tool) =>
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['get_tasks', 'get_task', 'next_task', 'set_task_status'].includes(tool)
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);
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expect(taskManagementTools.length).toBeGreaterThan(0);
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const analysisTools = allTools.filter((tool) =>
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['analyze_project_complexity', 'complexity_report'].includes(tool)
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);
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expect(analysisTools.length).toBeGreaterThan(0);
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const tagManagementTools = allTools.filter((tool) =>
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['add_tag', 'delete_tag', 'list_tags', 'use_tag'].includes(tool)
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);
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expect(tagManagementTools.length).toBeGreaterThan(0);
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});
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it('should handle error conditions gracefully', () => {
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const problematicInputs = [
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'null',
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'undefined',
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' ',
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'\n\t',
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'special!@#$%^&*()characters',
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'very,very,very,very,very,very,very,long,comma,separated,list,with,invalid,tools,that,should,fallback,to,all'
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];
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problematicInputs.forEach((input) => {
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mockServer.tools = [];
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mockServer.addTool.mockClear();
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process.env.TASK_MASTER_TOOLS = input;
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expect(() => registerTaskMasterTools(mockServer)).not.toThrow();
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expect(mockServer.addTool).toHaveBeenCalledTimes(ALL_COUNT);
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});
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});
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});
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});
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