feat(mosaic): add top-level mosaic config command (CU-04-04, CU-04-05)

Adds `mosaic config` command tree with five subcommands (show, get, set,
edit, path) backed by ConfigService; adds minimal get/set/path/readAll
primitives to ConfigService + FileConfigAdapter. Includes Vitest tests.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/mosaic/src/cli.ts

@@ -5,6 +5,7 @@ import { Command } from 'commander';
 import { registerBrainCommand } from '@mosaicstack/brain';
 import { registerQualityRails } from '@mosaicstack/quality-rails';
 import { registerAgentCommand } from './commands/agent.js';
+import { registerConfigCommand } from './commands/config.js';
 import { registerMissionCommand } from './commands/mission.js';
 // prdy is registered via launch.ts
 import { registerLaunchCommands } from './commands/launch.js';
@@ -330,6 +331,10 @@ registerGatewayCommand(program);
 
 registerAgentCommand(program);
 
+// ─── config ────────────────────────────────────────────────────────────
+
+registerConfigCommand(program);
+
 // ─── mission ───────────────────────────────────────────────────────────
 
 registerMissionCommand(program);

packages/mosaic/src/commands/config.spec.ts

@@ -0,0 +1,289 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { Command } from 'commander';
+import { registerConfigCommand } from './config.js';
+
+// ── helpers ──────────────────────────────────────────────────────────────────
+
+/** Build a fresh Command tree with the config command registered. */
+function buildProgram(): Command {
+  const program = new Command();
+  program.exitOverride(); // prevent process.exit during tests
+  registerConfigCommand(program);
+  return program;
+}
+
+/** Locate the 'config' command registered on the root program. */
+function getConfigCmd(program: Command): Command {
+  const found = program.commands.find((c) => c.name() === 'config');
+  if (!found) throw new Error('config command not found');
+  return found;
+}
+
+// ── subcommand registration ───────────────────────────────────────────────────
+
+describe('registerConfigCommand', () => {
+  it('registers a "config" command on the program', () => {
+    const program = buildProgram();
+    const names = program.commands.map((c) => c.name());
+    expect(names).toContain('config');
+  });
+
+  it('registers exactly the five required subcommands', () => {
+    const program = buildProgram();
+    const config = getConfigCmd(program);
+    const subs = config.commands.map((c) => c.name()).sort();
+    expect(subs).toEqual(['edit', 'get', 'path', 'set', 'show']);
+  });
+});
+
+// ── mock config service ───────────────────────────────────────────────────────
+
+const mockSoul = {
+  agentName: 'TestBot',
+  roleDescription: 'test role',
+  communicationStyle: 'direct' as const,
+};
+const mockUser = { userName: 'Tester', pronouns: 'they/them', timezone: 'UTC' };
+const mockTools = { credentialsLocation: '/dev/null' };
+
+const mockSvc = {
+  readSoul: vi.fn().mockResolvedValue(mockSoul),
+  readUser: vi.fn().mockResolvedValue(mockUser),
+  readTools: vi.fn().mockResolvedValue(mockTools),
+  writeSoul: vi.fn().mockResolvedValue(undefined),
+  writeUser: vi.fn().mockResolvedValue(undefined),
+  writeTools: vi.fn().mockResolvedValue(undefined),
+  syncFramework: vi.fn().mockResolvedValue(undefined),
+  readAll: vi.fn().mockResolvedValue({ soul: mockSoul, user: mockUser, tools: mockTools }),
+  getValue: vi.fn().mockResolvedValue('TestBot'),
+  setValue: vi.fn().mockResolvedValue('OldBot'),
+  getConfigPath: vi
+    .fn()
+    .mockImplementation((section?: string) =>
+      section
+        ? `/home/user/.config/mosaic/${section.toUpperCase()}.md`
+        : '/home/user/.config/mosaic',
+    ),
+  isInitialized: vi.fn().mockReturnValue(true),
+};
+
+// Mock the config-service module so commands use our mock.
+vi.mock('../config/config-service.js', () => ({
+  createConfigService: vi.fn(() => mockSvc),
+}));
+
+// Also mock child_process for the edit command.
+vi.mock('node:child_process', () => ({
+  spawnSync: vi.fn().mockReturnValue({ status: 0, error: undefined }),
+}));
+
+// ── config show ───────────────────────────────────────────────────────────────
+
+describe('config show', () => {
+  let consoleSpy: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => undefined);
+    vi.clearAllMocks();
+    mockSvc.isInitialized.mockReturnValue(true);
+    mockSvc.readAll.mockResolvedValue({ soul: mockSoul, user: mockUser, tools: mockTools });
+  });
+
+  afterEach(() => {
+    consoleSpy.mockRestore();
+  });
+
+  it('calls readAll() and prints a table by default', async () => {
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'show']);
+    expect(mockSvc.readAll).toHaveBeenCalledOnce();
+    // Should have printed something
+    expect(consoleSpy).toHaveBeenCalled();
+  });
+
+  it('prints JSON when --format json is passed', async () => {
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'show', '--format', 'json']);
+    expect(mockSvc.readAll).toHaveBeenCalledOnce();
+    // Verify JSON was logged
+    const allOutput = consoleSpy.mock.calls.map((c) => c[0] as string).join('\n');
+    expect(allOutput).toContain('"agentName"');
+  });
+});
+
+// ── config get ────────────────────────────────────────────────────────────────
+
+describe('config get', () => {
+  let consoleSpy: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => undefined);
+    vi.clearAllMocks();
+    mockSvc.isInitialized.mockReturnValue(true);
+    mockSvc.getValue.mockResolvedValue('TestBot');
+  });
+
+  afterEach(() => {
+    consoleSpy.mockRestore();
+  });
+
+  it('delegates to getValue() with the provided key', async () => {
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'get', 'soul.agentName']);
+    expect(mockSvc.getValue).toHaveBeenCalledWith('soul.agentName');
+  });
+
+  it('prints the returned value', async () => {
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'get', 'soul.agentName']);
+    expect(consoleSpy).toHaveBeenCalledWith('TestBot');
+  });
+});
+
+// ── config set ────────────────────────────────────────────────────────────────
+
+describe('config set', () => {
+  let consoleSpy: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => undefined);
+    vi.clearAllMocks();
+    mockSvc.isInitialized.mockReturnValue(true);
+    mockSvc.setValue.mockResolvedValue('OldBot');
+  });
+
+  afterEach(() => {
+    consoleSpy.mockRestore();
+  });
+
+  it('delegates to setValue() with key and value', async () => {
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'set', 'soul.agentName', 'NewBot']);
+    expect(mockSvc.setValue).toHaveBeenCalledWith('soul.agentName', 'NewBot');
+  });
+
+  it('prints old and new values', async () => {
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'set', 'soul.agentName', 'NewBot']);
+    const output = consoleSpy.mock.calls.map((c) => c[0] as string).join('\n');
+    expect(output).toContain('OldBot');
+    expect(output).toContain('NewBot');
+  });
+});
+
+// ── config path ───────────────────────────────────────────────────────────────
+
+describe('config path', () => {
+  let consoleSpy: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => undefined);
+    vi.clearAllMocks();
+    mockSvc.getConfigPath.mockImplementation((section?: string) =>
+      section
+        ? `/home/user/.config/mosaic/${section.toUpperCase()}.md`
+        : '/home/user/.config/mosaic',
+    );
+  });
+
+  afterEach(() => {
+    consoleSpy.mockRestore();
+  });
+
+  it('prints the mosaicHome directory when no section is specified', async () => {
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'path']);
+    expect(mockSvc.getConfigPath).toHaveBeenCalledWith();
+    expect(consoleSpy).toHaveBeenCalledWith('/home/user/.config/mosaic');
+  });
+
+  it('prints the section file path when --section is given', async () => {
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'path', '--section', 'soul']);
+    expect(mockSvc.getConfigPath).toHaveBeenCalledWith('soul');
+    expect(consoleSpy).toHaveBeenCalledWith('/home/user/.config/mosaic/SOUL.md');
+  });
+});
+
+// ── config edit ───────────────────────────────────────────────────────────────
+
+describe('config edit', () => {
+  let consoleSpy: ReturnType<typeof vi.spyOn>;
+  let spawnSyncMock: ReturnType<typeof vi.fn>;
+
+  beforeEach(async () => {
+    consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => undefined);
+    vi.clearAllMocks();
+    mockSvc.isInitialized.mockReturnValue(true);
+    mockSvc.readAll.mockResolvedValue({ soul: mockSoul, user: mockUser, tools: mockTools });
+    mockSvc.getConfigPath.mockImplementation((section?: string) =>
+      section
+        ? `/home/user/.config/mosaic/${section.toUpperCase()}.md`
+        : '/home/user/.config/mosaic',
+    );
+
+    // Re-import to get the mock reference
+    const cp = await import('node:child_process');
+    spawnSyncMock = cp.spawnSync as ReturnType<typeof vi.fn>;
+    spawnSyncMock.mockReturnValue({ status: 0, error: undefined });
+  });
+
+  afterEach(() => {
+    consoleSpy.mockRestore();
+  });
+
+  it('calls spawnSync with the editor binary and config path', async () => {
+    process.env['EDITOR'] = 'nano';
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'edit']);
+    expect(spawnSyncMock).toHaveBeenCalledWith(
+      'nano',
+      ['/home/user/.config/mosaic'],
+      expect.objectContaining({ stdio: 'inherit' }),
+    );
+    delete process.env['EDITOR'];
+  });
+
+  it('falls back to "vi" when EDITOR is not set', async () => {
+    delete process.env['EDITOR'];
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'edit']);
+    expect(spawnSyncMock).toHaveBeenCalledWith('vi', expect.any(Array), expect.any(Object));
+  });
+
+  it('opens the section-specific file when --section is provided', async () => {
+    process.env['EDITOR'] = 'code';
+    const program = buildProgram();
+    await program.parseAsync(['node', 'mosaic', 'config', 'edit', '--section', 'soul']);
+    expect(spawnSyncMock).toHaveBeenCalledWith(
+      'code',
+      ['/home/user/.config/mosaic/SOUL.md'],
+      expect.any(Object),
+    );
+    delete process.env['EDITOR'];
+  });
+});
+
+// ── not-initialized guard ────────────────────────────────────────────────────
+
+describe('not-initialized guard', () => {
+  let consoleErrorSpy: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation(() => undefined);
+    vi.clearAllMocks();
+    mockSvc.isInitialized.mockReturnValue(false);
+  });
+
+  afterEach(() => {
+    consoleErrorSpy.mockRestore();
+    mockSvc.isInitialized.mockReturnValue(true);
+  });
+
+  it('prints a helpful message when config is missing (show)', async () => {
+    const program = buildProgram();
+    // process.exit is intercepted; catch the resulting error from exitOverride
+    await expect(program.parseAsync(['node', 'mosaic', 'config', 'show'])).rejects.toThrow();
+    expect(consoleErrorSpy).toHaveBeenCalledWith(expect.stringContaining('mosaic wizard'));
+  });
+});

packages/mosaic/src/commands/config.ts

@@ -0,0 +1,206 @@
+import { spawnSync } from 'node:child_process';
+import type { Command } from 'commander';
+import { createConfigService } from '../config/config-service.js';
+import { DEFAULT_MOSAIC_HOME } from '../constants.js';
+
+/**
+ * Resolve mosaicHome from the MOSAIC_HOME env var or the default constant.
+ */
+function getMosaicHome(): string {
+  return process.env['MOSAIC_HOME'] ?? DEFAULT_MOSAIC_HOME;
+}
+
+/**
+ * Guard: print an error and exit(1) if config has not been initialised.
+ */
+function assertInitialized(svc: ReturnType<typeof createConfigService>): void {
+  if (!svc.isInitialized()) {
+    console.error('No config found — run `mosaic wizard` first.');
+    process.exit(1);
+  }
+}
+
+/**
+ * Flatten a nested object into dotted-key rows for table display.
+ */
+function flattenConfig(obj: Record<string, unknown>, prefix = ''): Array<[string, string]> {
+  const rows: Array<[string, string]> = [];
+  for (const [k, v] of Object.entries(obj)) {
+    const key = prefix ? `${prefix}.${k}` : k;
+    if (v !== null && typeof v === 'object' && !Array.isArray(v)) {
+      rows.push(...flattenConfig(v as Record<string, unknown>, key));
+    } else {
+      rows.push([key, v === undefined || v === null ? '' : String(v)]);
+    }
+  }
+  return rows;
+}
+
+/**
+ * Print rows as a padded ASCII table.
+ */
+function printTable(rows: Array<[string, string]>): void {
+  if (rows.length === 0) {
+    console.log('(no config values)');
+    return;
+  }
+  const maxKey = Math.max(...rows.map(([k]) => k.length));
+  const header = `${'Key'.padEnd(maxKey)}  Value`;
+  const divider = '-'.repeat(header.length);
+  console.log(header);
+  console.log(divider);
+  for (const [k, v] of rows) {
+    console.log(`${k.padEnd(maxKey)}  ${v}`);
+  }
+}
+
+export function registerConfigCommand(program: Command): void {
+  const cmd = program
+    .command('config')
+    .description('Manage Mosaic framework configuration')
+    .configureHelp({ sortSubcommands: true });
+
+  // ── config show ─────────────────────────────────────────────────────────
+
+  cmd
+    .command('show')
+    .description('Print the current resolved config')
+    .option('-f, --format <format>', 'Output format: table or json', 'table')
+    .action(async (opts: { format: string }) => {
+      const mosaicHome = getMosaicHome();
+      const svc = createConfigService(mosaicHome, mosaicHome);
+      assertInitialized(svc);
+
+      const config = await svc.readAll();
+
+      if (opts.format === 'json') {
+        console.log(JSON.stringify(config, null, 2));
+        return;
+      }
+
+      // Default: table
+      const rows = flattenConfig(config as unknown as Record<string, unknown>);
+      printTable(rows);
+    });
+
+  // ── config get <key> ────────────────────────────────────────────────────
+
+  cmd
+    .command('get <key>')
+    .description('Print a single config value (supports dotted keys, e.g. soul.agentName)')
+    .action(async (key: string) => {
+      const mosaicHome = getMosaicHome();
+      const svc = createConfigService(mosaicHome, mosaicHome);
+      assertInitialized(svc);
+
+      const value = await svc.getValue(key);
+      if (value === undefined) {
+        console.error(`Key "${key}" not found.`);
+        process.exit(1);
+      }
+      if (typeof value === 'object') {
+        console.log(JSON.stringify(value, null, 2));
+      } else {
+        console.log(String(value));
+      }
+    });
+
+  // ── config set <key> <value> ────────────────────────────────────────────
+
+  cmd
+    .command('set <key> <value>')
+    .description(
+      'Set a config value and persist (supports dotted keys, e.g. soul.agentName "Jarvis")',
+    )
+    .action(async (key: string, value: string) => {
+      const mosaicHome = getMosaicHome();
+      const svc = createConfigService(mosaicHome, mosaicHome);
+      assertInitialized(svc);
+
+      let previous: unknown;
+      try {
+        previous = await svc.setValue(key, value);
+      } catch (err) {
+        console.error(err instanceof Error ? err.message : String(err));
+        process.exit(1);
+      }
+
+      const prevStr = previous === undefined ? '(unset)' : String(previous);
+      console.log(`${key}`);
+      console.log(`  old: ${prevStr}`);
+      console.log(`  new: ${value}`);
+    });
+
+  // ── config edit ─────────────────────────────────────────────────────────
+
+  cmd
+    .command('edit')
+    .description('Open the config directory in $EDITOR (or vi)')
+    .option('-s, --section <section>', 'Open a specific section file: soul | user | tools')
+    .action(async (opts: { section?: string }) => {
+      const mosaicHome = getMosaicHome();
+      const svc = createConfigService(mosaicHome, mosaicHome);
+      assertInitialized(svc);
+
+      const editor = process.env['EDITOR'] ?? 'vi';
+
+      let targetPath: string;
+      if (opts.section) {
+        const validSections = ['soul', 'user', 'tools'] as const;
+        if (!validSections.includes(opts.section as (typeof validSections)[number])) {
+          console.error(`Invalid section "${opts.section}". Choose: soul, user, tools`);
+          process.exit(1);
+        }
+        targetPath = svc.getConfigPath(opts.section as 'soul' | 'user' | 'tools');
+      } else {
+        targetPath = svc.getConfigPath();
+      }
+
+      const result = spawnSync(editor, [targetPath], { stdio: 'inherit' });
+
+      if (result.error) {
+        console.error(`Failed to open editor: ${result.error.message}`);
+        process.exit(1);
+      }
+
+      if (result.status !== 0) {
+        console.error(`Editor exited with code ${String(result.status ?? 1)}`);
+        process.exit(result.status ?? 1);
+      }
+
+      // Re-read after edit and report any issues
+      try {
+        await svc.readAll();
+        console.log('Config looks valid.');
+      } catch (err) {
+        console.error('Warning: config may have validation issues:');
+        console.error(err instanceof Error ? err.message : String(err));
+        process.exit(1);
+      }
+    });
+
+  // ── config path ─────────────────────────────────────────────────────────
+
+  cmd
+    .command('path')
+    .description('Print the active config directory path (for scripting)')
+    .option(
+      '-s, --section <section>',
+      'Print path for a specific section file: soul | user | tools',
+    )
+    .action(async (opts: { section?: string }) => {
+      const mosaicHome = getMosaicHome();
+      const svc = createConfigService(mosaicHome, mosaicHome);
+
+      if (opts.section) {
+        const validSections = ['soul', 'user', 'tools'] as const;
+        if (!validSections.includes(opts.section as (typeof validSections)[number])) {
+          console.error(`Invalid section "${opts.section}". Choose: soul, user, tools`);
+          process.exit(1);
+        }
+        console.log(svc.getConfigPath(opts.section as 'soul' | 'user' | 'tools'));
+      } else {
+        console.log(svc.getConfigPath());
+      }
+    });
+}

packages/mosaic/src/config/config-service.ts

@@ -1,6 +1,16 @@
 import type { SoulConfig, UserConfig, ToolsConfig, InstallAction } from '../types.js';
 import { FileConfigAdapter } from './file-adapter.js';
 
+/** Supported top-level config sections for dotted-key access. */
+export type ConfigSection = 'soul' | 'user' | 'tools';
+
+/** A resolved view of all config sections, keyed by section name. */
+export interface ResolvedConfig {
+  soul: SoulConfig;
+  user: UserConfig;
+  tools: ToolsConfig;
+}
+
 /**
  * ConfigService interface — abstracts config read/write operations.
  * Currently backed by FileConfigAdapter (writes .md files from templates).
@@ -16,6 +26,35 @@ export interface ConfigService {
   writeTools(config: ToolsConfig): Promise<void>;
 
   syncFramework(action: InstallAction): Promise<void>;
+
+  /**
+   * Return the resolved (merged) config across all sections.
+   */
+  readAll(): Promise<ResolvedConfig>;
+
+  /**
+   * Read a single value by dotted key (e.g. "soul.agentName").
+   * Returns undefined if the key doesn't exist.
+   */
+  getValue(dottedKey: string): Promise<unknown>;
+
+  /**
+   * Set a single value by dotted key (e.g. "soul.agentName") and persist.
+   * Returns the previous value (or undefined).
+   */
+  setValue(dottedKey: string, value: string): Promise<unknown>;
+
+  /**
+   * Return the filesystem path for a given config section file.
+   * When no section is provided, returns the mosaicHome directory.
+   */
+  getConfigPath(section?: ConfigSection): string;
+
+  /**
+   * Returns true if the mosaicHome directory exists and at least one
+   * config file (SOUL.md, USER.md, TOOLS.md) is present.
+   */
+  isInitialized(): boolean;
 }
 
 export function createConfigService(mosaicHome: string, sourceDir: string): ConfigService {

packages/mosaic/src/config/file-adapter.ts

@@ -1,6 +1,6 @@
 import { readFileSync, existsSync, readdirSync, statSync, copyFileSync } from 'node:fs';
 import { join } from 'node:path';
-import type { ConfigService } from './config-service.js';
+import type { ConfigService, ConfigSection, ResolvedConfig } from './config-service.js';
 import type { SoulConfig, UserConfig, ToolsConfig, InstallAction } from '../types.js';
 import { soulSchema, userSchema, toolsSchema } from './schemas.js';
 import { renderTemplate } from '../template/engine.js';
@@ -159,6 +159,73 @@ export class FileConfigAdapter implements ConfigService {
     }
   }
 
+  async readAll(): Promise<ResolvedConfig> {
+    const [soul, user, tools] = await Promise.all([
+      this.readSoul(),
+      this.readUser(),
+      this.readTools(),
+    ]);
+    return { soul, user, tools };
+  }
+
+  async getValue(dottedKey: string): Promise<unknown> {
+    const parts = dottedKey.split('.');
+    const section = parts[0] ?? '';
+    const field = parts.slice(1).join('.');
+    const config = await this.readAll();
+    if (!this.isValidSection(section)) return undefined;
+    const sectionData = config[section as ConfigSection] as Record<string, unknown>;
+    return field ? sectionData[field] : sectionData;
+  }
+
+  async setValue(dottedKey: string, value: string): Promise<unknown> {
+    const parts = dottedKey.split('.');
+    const section = parts[0] ?? '';
+    const field = parts.slice(1).join('.');
+    if (!this.isValidSection(section) || !field) {
+      throw new Error(
+        `Invalid key "${dottedKey}". Use format <section>.<field> (e.g. soul.agentName).`,
+      );
+    }
+
+    const previous = await this.getValue(dottedKey);
+
+    if (section === 'soul') {
+      const current = await this.readSoul();
+      await this.writeSoul({ ...current, [field]: value });
+    } else if (section === 'user') {
+      const current = await this.readUser();
+      await this.writeUser({ ...current, [field]: value });
+    } else {
+      const current = await this.readTools();
+      await this.writeTools({ ...current, [field]: value });
+    }
+
+    return previous;
+  }
+
+  getConfigPath(section?: ConfigSection): string {
+    if (!section) return this.mosaicHome;
+    const fileMap: Record<ConfigSection, string> = {
+      soul: join(this.mosaicHome, 'SOUL.md'),
+      user: join(this.mosaicHome, 'USER.md'),
+      tools: join(this.mosaicHome, 'TOOLS.md'),
+    };
+    return fileMap[section];
+  }
+
+  isInitialized(): boolean {
+    return (
+      existsSync(join(this.mosaicHome, 'SOUL.md')) ||
+      existsSync(join(this.mosaicHome, 'USER.md')) ||
+      existsSync(join(this.mosaicHome, 'TOOLS.md'))
+    );
+  }
+
+  private isValidSection(s: string): s is ConfigSection {
+    return s === 'soul' || s === 'user' || s === 'tools';
+  }
+
   /**
    * Look for template in source dir first, then mosaic home.
    */