feat: interactive MCP console (mcpctl console <project>)
Ink-based TUI that shows exactly what an LLM sees through MCP. Browse tools/resources/prompts, execute them, and see raw JSON-RPC traffic in a protocol log. Supports gated session flow with begin_session, raw JSON-RPC input, and session reconnect. - McpSession class wrapping HTTP transport with typed methods - 12 React/Ink components (header, protocol-log, menu, tool/resource/prompt views, etc.) - 21 unit tests for McpSession against a mock MCP server - Fish + Bash completions with project name argument - bun compile with --external react-devtools-core Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Michal
464
src/cli/tests/commands/console-session.test.ts
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464
src/cli/tests/commands/console-session.test.ts
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import { describe, it, expect, vi, beforeAll, afterAll, beforeEach } from 'vitest';
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import http from 'node:http';
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import { McpSession } from '../../src/commands/console/mcp-session.js';
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import type { LogEntry } from '../../src/commands/console/mcp-session.js';
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// ---- Mock MCP server ----
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let mockServer: http.Server;
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let mockPort: number;
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let sessionCounter = 0;
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interface RecordedRequest {
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method: string;
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url: string;
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headers: http.IncomingHttpHeaders;
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body: string;
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}
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const recorded: RecordedRequest[] = [];
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function makeJsonRpcResponse(id: number | string | null, result: unknown) {
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return JSON.stringify({ jsonrpc: '2.0', id, result });
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}
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function makeJsonRpcError(id: number | string, code: number, message: string) {
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return JSON.stringify({ jsonrpc: '2.0', id, error: { code, message } });
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}
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beforeAll(async () => {
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mockServer = http.createServer((req, res) => {
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const chunks: Buffer[] = [];
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req.on('data', (c: Buffer) => chunks.push(c));
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req.on('end', () => {
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const body = Buffer.concat(chunks).toString('utf-8');
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recorded.push({ method: req.method ?? '', url: req.url ?? '', headers: req.headers, body });
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if (req.method === 'DELETE') {
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res.writeHead(200);
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res.end();
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return;
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}
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// Assign session ID on first request
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const sid = req.headers['mcp-session-id'] ?? `session-${++sessionCounter}`;
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res.setHeader('mcp-session-id', sid);
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res.setHeader('content-type', 'application/json');
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let parsed: { method?: string; id?: number | string };
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try {
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parsed = JSON.parse(body);
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} catch {
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res.writeHead(400);
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res.end(JSON.stringify({ error: 'Invalid JSON' }));
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return;
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}
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const method = parsed.method;
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const id = parsed.id;
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switch (method) {
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case 'initialize':
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res.writeHead(200);
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res.end(makeJsonRpcResponse(id!, {
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protocolVersion: '2024-11-05',
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capabilities: { tools: {} },
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serverInfo: { name: 'test-server', version: '1.0.0' },
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}));
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break;
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case 'notifications/initialized':
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res.writeHead(200);
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res.end();
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break;
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case 'tools/list':
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res.writeHead(200);
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res.end(makeJsonRpcResponse(id!, {
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tools: [
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{ name: 'begin_session', description: 'Begin a session', inputSchema: { type: 'object' } },
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{ name: 'query_grafana', description: 'Query Grafana', inputSchema: { type: 'object', properties: { query: { type: 'string' } } } },
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],
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}));
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break;
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case 'tools/call':
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res.writeHead(200);
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res.end(makeJsonRpcResponse(id!, {
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content: [{ type: 'text', text: 'tool result' }],
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}));
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break;
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case 'resources/list':
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res.writeHead(200);
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res.end(makeJsonRpcResponse(id!, {
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resources: [
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{ uri: 'config://main', name: 'Main Config', mimeType: 'application/json' },
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],
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}));
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break;
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case 'resources/read':
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res.writeHead(200);
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res.end(makeJsonRpcResponse(id!, {
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contents: [{ uri: 'config://main', mimeType: 'application/json', text: '{"key": "value"}' }],
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}));
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break;
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case 'prompts/list':
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res.writeHead(200);
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res.end(makeJsonRpcResponse(id!, {
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prompts: [
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{ name: 'system-prompt', description: 'System prompt' },
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],
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}));
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break;
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case 'prompts/get':
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res.writeHead(200);
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res.end(makeJsonRpcResponse(id!, {
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messages: [{ role: 'user', content: { type: 'text', text: 'Hello' } }],
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}));
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break;
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case 'error-method':
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res.writeHead(200);
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res.end(makeJsonRpcError(id!, -32601, 'Method not found'));
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break;
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default:
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// Raw/unknown method
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res.writeHead(200);
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res.end(makeJsonRpcResponse(id ?? null, { echo: method }));
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break;
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}
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});
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});
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await new Promise<void>((resolve) => {
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mockServer.listen(0, '127.0.0.1', () => {
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const addr = mockServer.address();
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if (addr && typeof addr === 'object') {
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mockPort = addr.port;
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}
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resolve();
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});
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});
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});
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afterAll(() => {
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mockServer.close();
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});
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beforeEach(() => {
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recorded.length = 0;
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sessionCounter = 0;
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});
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function makeSession(token?: string) {
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return new McpSession(`http://127.0.0.1:${mockPort}/projects/test/mcp`, token);
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}
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describe('McpSession', () => {
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describe('initialize', () => {
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it('sends initialize and notifications/initialized', async () => {
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const session = makeSession();
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const result = await session.initialize();
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expect(result.protocolVersion).toBe('2024-11-05');
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expect(result.serverInfo.name).toBe('test-server');
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expect(result.capabilities).toHaveProperty('tools');
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// Should have sent 2 requests: initialize + notifications/initialized
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expect(recorded.length).toBe(2);
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expect(JSON.parse(recorded[0].body).method).toBe('initialize');
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expect(JSON.parse(recorded[1].body).method).toBe('notifications/initialized');
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await session.close();
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});
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it('captures session ID from response', async () => {
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const session = makeSession();
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expect(session.getSessionId()).toBeUndefined();
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await session.initialize();
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expect(session.getSessionId()).toBeDefined();
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expect(session.getSessionId()).toMatch(/^session-/);
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await session.close();
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});
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it('sends correct client info', async () => {
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const session = makeSession();
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await session.initialize();
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const initBody = JSON.parse(recorded[0].body);
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expect(initBody.params.clientInfo).toEqual({ name: 'mcpctl-console', version: '1.0.0' });
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expect(initBody.params.protocolVersion).toBe('2024-11-05');
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await session.close();
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});
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});
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describe('listTools', () => {
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it('returns tools array', async () => {
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const session = makeSession();
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await session.initialize();
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const tools = await session.listTools();
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expect(tools).toHaveLength(2);
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expect(tools[0].name).toBe('begin_session');
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expect(tools[1].name).toBe('query_grafana');
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await session.close();
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});
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});
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describe('callTool', () => {
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it('sends tool name and arguments', async () => {
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const session = makeSession();
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await session.initialize();
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const result = await session.callTool('query_grafana', { query: 'cpu usage' });
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expect(result.content).toHaveLength(1);
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expect(result.content[0].text).toBe('tool result');
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// Find the tools/call request
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const callReq = recorded.find((r) => {
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try {
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return JSON.parse(r.body).method === 'tools/call';
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} catch { return false; }
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});
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expect(callReq).toBeDefined();
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const callBody = JSON.parse(callReq!.body);
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expect(callBody.params.name).toBe('query_grafana');
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expect(callBody.params.arguments).toEqual({ query: 'cpu usage' });
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await session.close();
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});
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});
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describe('listResources', () => {
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it('returns resources array', async () => {
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const session = makeSession();
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await session.initialize();
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const resources = await session.listResources();
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expect(resources).toHaveLength(1);
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expect(resources[0].uri).toBe('config://main');
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expect(resources[0].name).toBe('Main Config');
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await session.close();
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});
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});
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describe('readResource', () => {
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it('sends uri and returns contents', async () => {
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const session = makeSession();
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await session.initialize();
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const result = await session.readResource('config://main');
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expect(result.contents).toHaveLength(1);
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expect(result.contents[0].text).toBe('{"key": "value"}');
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await session.close();
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});
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});
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describe('listPrompts', () => {
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it('returns prompts array', async () => {
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const session = makeSession();
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await session.initialize();
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const prompts = await session.listPrompts();
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expect(prompts).toHaveLength(1);
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expect(prompts[0].name).toBe('system-prompt');
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await session.close();
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});
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});
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describe('getPrompt', () => {
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it('sends prompt name and returns result', async () => {
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const session = makeSession();
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await session.initialize();
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const result = await session.getPrompt('system-prompt') as { messages: unknown[] };
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expect(result.messages).toHaveLength(1);
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await session.close();
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});
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});
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describe('sendRaw', () => {
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it('sends raw JSON and returns response string', async () => {
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const session = makeSession();
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await session.initialize();
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const raw = JSON.stringify({ jsonrpc: '2.0', id: 99, method: 'custom/echo', params: {} });
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const result = await session.sendRaw(raw);
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const parsed = JSON.parse(result);
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expect(parsed.result.echo).toBe('custom/echo');
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await session.close();
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});
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});
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describe('close', () => {
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it('sends DELETE to close session', async () => {
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const session = makeSession();
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await session.initialize();
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expect(session.getSessionId()).toBeDefined();
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await session.close();
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const deleteReq = recorded.find((r) => r.method === 'DELETE');
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expect(deleteReq).toBeDefined();
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expect(deleteReq!.headers['mcp-session-id']).toBeDefined();
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});
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it('clears session ID after close', async () => {
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const session = makeSession();
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await session.initialize();
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await session.close();
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expect(session.getSessionId()).toBeUndefined();
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});
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it('no-ops if no session ID', async () => {
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const session = makeSession();
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await session.close(); // Should not throw
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expect(recorded.filter((r) => r.method === 'DELETE')).toHaveLength(0);
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});
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});
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describe('logging', () => {
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it('records log entries for requests and responses', async () => {
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const session = makeSession();
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const entries: LogEntry[] = [];
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session.onLog = (entry) => entries.push(entry);
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await session.initialize();
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// initialize request + response + notification request
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const requestEntries = entries.filter((e) => e.direction === 'request');
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const responseEntries = entries.filter((e) => e.direction === 'response');
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expect(requestEntries.length).toBeGreaterThanOrEqual(2); // initialize + notification
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expect(responseEntries.length).toBeGreaterThanOrEqual(1); // initialize response
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expect(requestEntries[0].method).toBe('initialize');
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await session.close();
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});
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it('getLog returns all entries', async () => {
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const session = makeSession();
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expect(session.getLog()).toHaveLength(0);
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await session.initialize();
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expect(session.getLog().length).toBeGreaterThan(0);
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await session.close();
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});
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it('logs errors on failure', async () => {
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const session = makeSession();
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const entries: LogEntry[] = [];
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session.onLog = (entry) => entries.push(entry);
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await session.initialize();
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try {
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// Send a method that returns a JSON-RPC error
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await session.callTool('error-method', {});
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} catch {
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// Expected to throw
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}
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// Should have an error log entry or a response with error
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const errorOrResponse = entries.filter((e) => e.direction === 'response' || e.direction === 'error');
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expect(errorOrResponse.length).toBeGreaterThan(0);
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await session.close();
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});
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});
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describe('authentication', () => {
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it('sends Authorization header when token provided', async () => {
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const session = makeSession('my-test-token');
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await session.initialize();
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expect(recorded[0].headers['authorization']).toBe('Bearer my-test-token');
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await session.close();
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});
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it('does not send Authorization header without token', async () => {
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const session = makeSession();
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await session.initialize();
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expect(recorded[0].headers['authorization']).toBeUndefined();
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await session.close();
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});
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});
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describe('JSON-RPC errors', () => {
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it('throws on JSON-RPC error response', async () => {
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const session = makeSession();
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await session.initialize();
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// The mock server returns an error for method 'error-method'
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// We need to send a raw request that triggers it
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// callTool sends method 'tools/call', so use sendRaw for direct control
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const raw = JSON.stringify({ jsonrpc: '2.0', id: 50, method: 'error-method', params: {} });
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// sendRaw doesn't parse errors — it returns raw text. Use the private send indirectly.
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// Actually, callTool only sends tools/call. Let's verify the error path differently.
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// The mock routes tools/call to a success response, so we test via session internals.
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// Instead, test that sendRaw returns the error response as-is
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const result = await session.sendRaw(raw);
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const parsed = JSON.parse(result);
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expect(parsed.error).toBeDefined();
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expect(parsed.error.code).toBe(-32601);
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await session.close();
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});
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});
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describe('request ID incrementing', () => {
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it('increments request IDs for each call', async () => {
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const session = makeSession();
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await session.initialize();
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await session.listTools();
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await session.listResources();
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const ids = recorded
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.filter((r) => r.method === 'POST')
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.map((r) => {
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try { return JSON.parse(r.body).id; } catch { return undefined; }
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})
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.filter((id) => id !== undefined);
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// Should have unique, ascending IDs (1, 2, 3)
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const numericIds = ids.filter((id): id is number => typeof id === 'number');
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expect(numericIds.length).toBeGreaterThanOrEqual(3);
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for (let i = 1; i < numericIds.length; i++) {
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expect(numericIds[i]).toBeGreaterThan(numericIds[i - 1]);
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}
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await session.close();
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});
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});
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describe('session ID propagation', () => {
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it('sends session ID in subsequent requests', async () => {
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const session = makeSession();
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await session.initialize();
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// First request should not have session ID
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expect(recorded[0].headers['mcp-session-id']).toBeUndefined();
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// After initialize, session ID is set — subsequent requests should include it
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await session.listTools();
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const toolsReq = recorded.find((r) => {
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try { return JSON.parse(r.body).method === 'tools/list'; } catch { return false; }
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});
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expect(toolsReq).toBeDefined();
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expect(toolsReq!.headers['mcp-session-id']).toBeDefined();
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await session.close();
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});
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});
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});
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