diff --git a/packages/memory/package.json b/packages/memory/package.json
index 392c8eb..fad7d51 100644
--- a/packages/memory/package.json
+++ b/packages/memory/package.json
@@ -25,6 +25,7 @@
     "@mosaicstack/db": "workspace:*",
     "@mosaicstack/storage": "workspace:*",
     "@mosaicstack/types": "workspace:*",
+    "commander": "^13.0.0",
     "drizzle-orm": "^0.45.1"
   },
   "devDependencies": {
diff --git a/packages/memory/src/cli.spec.ts b/packages/memory/src/cli.spec.ts
new file mode 100644
index 0000000..a293d1d
--- /dev/null
+++ b/packages/memory/src/cli.spec.ts
@@ -0,0 +1,63 @@
+import { describe, it, expect } from 'vitest';
+import { Command } from 'commander';
+import { registerMemoryCommand } from './cli.js';
+
+/**
+ * Smoke test — only verifies command wiring.
+ * Does NOT open a database connection.
+ */
+describe('registerMemoryCommand', () => {
+  function buildProgram(): Command {
+    const program = new Command('mosaic');
+    program.exitOverride(); // prevent process.exit during tests
+    registerMemoryCommand(program);
+    return program;
+  }
+
+  it('registers a "memory" subcommand', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory');
+    expect(memory).toBeDefined();
+  });
+
+  it('registers "memory search"', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory')!;
+    const search = memory.commands.find((c) => c.name() === 'search');
+    expect(search).toBeDefined();
+  });
+
+  it('registers "memory stats"', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory')!;
+    const stats = memory.commands.find((c) => c.name() === 'stats');
+    expect(stats).toBeDefined();
+  });
+
+  it('registers "memory insights list"', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory')!;
+    const insights = memory.commands.find((c) => c.name() === 'insights');
+    expect(insights).toBeDefined();
+    const list = insights!.commands.find((c) => c.name() === 'list');
+    expect(list).toBeDefined();
+  });
+
+  it('registers "memory preferences list"', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory')!;
+    const preferences = memory.commands.find((c) => c.name() === 'preferences');
+    expect(preferences).toBeDefined();
+    const list = preferences!.commands.find((c) => c.name() === 'list');
+    expect(list).toBeDefined();
+  });
+
+  it('"memory search" has --limit and --agent options', () => {
+    const program = buildProgram();
+    const memory = program.commands.find((c) => c.name() === 'memory')!;
+    const search = memory.commands.find((c) => c.name() === 'search')!;
+    const optNames = search.options.map((o) => o.long);
+    expect(optNames).toContain('--limit');
+    expect(optNames).toContain('--agent');
+  });
+});
diff --git a/packages/memory/src/cli.ts b/packages/memory/src/cli.ts
new file mode 100644
index 0000000..f3cb216
--- /dev/null
+++ b/packages/memory/src/cli.ts
@@ -0,0 +1,179 @@
+import type { Command } from 'commander';
+
+import type { MemoryAdapter } from './types.js';
+
+/**
+ * Build and return a connected MemoryAdapter from a connection string or
+ * the MEMORY_DB_URL / DATABASE_URL environment variable.
+ *
+ * For pgvector (postgres://...) the connection string is injected into
+ * DATABASE_URL so that PgVectorAdapter's internal createDb() picks it up.
+ *
+ * Throws with a human-readable message if no connection info is available.
+ */
+async function resolveAdapter(dbOption: string | undefined): Promise<MemoryAdapter> {
+  const connStr = dbOption ?? process.env['MEMORY_DB_URL'] ?? process.env['DATABASE_URL'];
+  if (!connStr) {
+    throw new Error(
+      'No database connection string provided. ' +
+        'Pass --db <connection-string> or set MEMORY_DB_URL / DATABASE_URL.',
+    );
+  }
+
+  // Lazy imports so the module loads cleanly without a live DB during smoke tests.
+  const { createMemoryAdapter, registerMemoryAdapter } = await import('./factory.js');
+
+  if (connStr.startsWith('postgres') || connStr.startsWith('pg')) {
+    // PgVectorAdapter reads DATABASE_URL via createDb() — inject it here.
+    process.env['DATABASE_URL'] = connStr;
+
+    const { PgVectorAdapter } = await import('./adapters/pgvector.js');
+    registerMemoryAdapter('pgvector', (cfg) => new PgVectorAdapter(cfg as never));
+    return createMemoryAdapter({ type: 'pgvector' });
+  }
+
+  // Keyword adapter backed by pglite storage; treat connStr as a data directory.
+  const { KeywordAdapter } = await import('./adapters/keyword.js');
+  const { createStorageAdapter, registerStorageAdapter } = await import('@mosaicstack/storage');
+  const { PgliteAdapter } = await import('@mosaicstack/storage');
+
+  registerStorageAdapter('pglite', (cfg) => new PgliteAdapter(cfg as never));
+
+  const storage = createStorageAdapter({ type: 'pglite', dataDir: connStr });
+
+  registerMemoryAdapter('keyword', (cfg) => new KeywordAdapter(cfg as never));
+  return createMemoryAdapter({ type: 'keyword', storage });
+}
+
+/**
+ * Register `memory` subcommands on an existing Commander program.
+ * Follows the registerQualityRails pattern from @mosaicstack/quality-rails.
+ */
+export function registerMemoryCommand(parent: Command): void {
+  const memory = parent.command('memory').description('Inspect and query the Mosaic memory layer');
+
+  // ── memory search <query> ──────────────────────────────────────────────
+  memory
+    .command('search <query>')
+    .description('Semantic search over insights')
+    .option('--db <connection-string>', 'Database connection string (or set MEMORY_DB_URL)')
+    .option('--limit <n>', 'Maximum number of results', '10')
+    .option('--agent <id>', 'Filter by agent / user ID')
+    .action(async (query: string, opts: { db?: string; limit: string; agent?: string }) => {
+      let adapter: MemoryAdapter | undefined;
+      try {
+        adapter = await resolveAdapter(opts.db);
+        const limit = parseInt(opts.limit, 10);
+        const userId = opts.agent ?? 'system';
+        const results = await adapter.searchInsights(userId, query, { limit });
+
+        if (results.length === 0) {
+          console.log('No insights found.');
+        } else {
+          for (const r of results) {
+            console.log(`[${r.id}] (score=${r.score.toFixed(3)}) ${r.content}`);
+          }
+        }
+      } catch (err) {
+        console.error(`Error: ${err instanceof Error ? err.message : String(err)}`);
+        process.exitCode = 1;
+      } finally {
+        await adapter?.close();
+      }
+    });
+
+  // ── memory stats ──────────────────────────────────────────────────────
+  memory
+    .command('stats')
+    .description('Print memory tier info: adapter type, insight count, preference count')
+    .option('--db <connection-string>', 'Database connection string (or set MEMORY_DB_URL)')
+    .option('--agent <id>', 'User / agent ID scope for counts', 'system')
+    .action(async (opts: { db?: string; agent: string }) => {
+      let adapter: MemoryAdapter | undefined;
+      try {
+        adapter = await resolveAdapter(opts.db);
+
+        const adapterType = adapter.name;
+
+        const insightCount = await adapter
+          .searchInsights(opts.agent, '', { limit: 100000 })
+          .then((r) => r.length)
+          .catch(() => -1);
+
+        const prefCount = await adapter
+          .listPreferences(opts.agent)
+          .then((r) => r.length)
+          .catch(() => -1);
+
+        console.log(`adapter:     ${adapterType}`);
+        console.log(`insights:    ${insightCount === -1 ? 'unavailable' : String(insightCount)}`);
+        console.log(`preferences: ${prefCount === -1 ? 'unavailable' : String(prefCount)}`);
+      } catch (err) {
+        console.error(`Error: ${err instanceof Error ? err.message : String(err)}`);
+        process.exitCode = 1;
+      } finally {
+        await adapter?.close();
+      }
+    });
+
+  // ── memory insights ───────────────────────────────────────────────────
+  const insightsCmd = memory.command('insights').description('Manage insights');
+
+  insightsCmd
+    .command('list')
+    .description('List recent insights')
+    .option('--db <connection-string>', 'Database connection string (or set MEMORY_DB_URL)')
+    .option('--limit <n>', 'Maximum number of results', '20')
+    .option('--agent <id>', 'User / agent ID scope', 'system')
+    .action(async (opts: { db?: string; limit: string; agent: string }) => {
+      let adapter: MemoryAdapter | undefined;
+      try {
+        adapter = await resolveAdapter(opts.db);
+        const limit = parseInt(opts.limit, 10);
+        const results = await adapter.searchInsights(opts.agent, '', { limit });
+
+        if (results.length === 0) {
+          console.log('No insights found.');
+        } else {
+          for (const r of results) {
+            console.log(`[${r.id}] ${r.content}`);
+          }
+        }
+      } catch (err) {
+        console.error(`Error: ${err instanceof Error ? err.message : String(err)}`);
+        process.exitCode = 1;
+      } finally {
+        await adapter?.close();
+      }
+    });
+
+  // ── memory preferences ────────────────────────────────────────────────
+  const prefsCmd = memory.command('preferences').description('Manage stored preferences');
+
+  prefsCmd
+    .command('list')
+    .description('List stored preferences')
+    .option('--db <connection-string>', 'Database connection string (or set MEMORY_DB_URL)')
+    .option('--agent <id>', 'User / agent ID scope', 'system')
+    .option('--category <cat>', 'Filter by category')
+    .action(async (opts: { db?: string; agent: string; category?: string }) => {
+      let adapter: MemoryAdapter | undefined;
+      try {
+        adapter = await resolveAdapter(opts.db);
+        const prefs = await adapter.listPreferences(opts.agent, opts.category);
+
+        if (prefs.length === 0) {
+          console.log('No preferences found.');
+        } else {
+          for (const p of prefs) {
+            console.log(`[${p.category}] ${p.key} = ${JSON.stringify(p.value)}`);
+          }
+        }
+      } catch (err) {
+        console.error(`Error: ${err instanceof Error ? err.message : String(err)}`);
+        process.exitCode = 1;
+      } finally {
+        await adapter?.close();
+      }
+    });
+}
diff --git a/packages/memory/src/index.ts b/packages/memory/src/index.ts
index bcbd5dd..97f734d 100644
--- a/packages/memory/src/index.ts
+++ b/packages/memory/src/index.ts
@@ -1,4 +1,5 @@
 export { createMemory, type Memory } from './memory.js';
+export { registerMemoryCommand } from './cli.js';
 export {
   createPreferencesRepo,
   type PreferencesRepo,
diff --git a/packages/mosaic/package.json b/packages/mosaic/package.json
index f51eda3..4fdb0e3 100644
--- a/packages/mosaic/package.json
+++ b/packages/mosaic/package.json
@@ -31,6 +31,7 @@
     "@mosaicstack/config": "workspace:*",
     "@mosaicstack/forge": "workspace:*",
     "@mosaicstack/macp": "workspace:*",
+    "@mosaicstack/memory": "workspace:*",
     "@mosaicstack/prdy": "workspace:*",
     "@mosaicstack/quality-rails": "workspace:*",
     "@mosaicstack/queue": "workspace:*",
diff --git a/packages/mosaic/src/cli.ts b/packages/mosaic/src/cli.ts
index f64570a..5a79f5c 100644
--- a/packages/mosaic/src/cli.ts
+++ b/packages/mosaic/src/cli.ts
@@ -3,6 +3,7 @@
 import { createRequire } from 'module';
 import { Command } from 'commander';
 import { registerBrainCommand } from '@mosaicstack/brain';
+import { registerMemoryCommand } from '@mosaicstack/memory';
 import { registerQualityRails } from '@mosaicstack/quality-rails';
 import { registerQueueCommand } from '@mosaicstack/queue';
 import { registerAgentCommand } from './commands/agent.js';
@@ -348,6 +349,10 @@ registerBrainCommand(program);
 
 registerQualityRails(program);
 
+// ─── memory ──────────────────────────────────────────────────────────────
+
+registerMemoryCommand(program);
+
 // ─── queue ───────────────────────────────────────────────────────────────
 
 registerQueueCommand(program);
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 606620d..ceb409f 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -441,6 +441,9 @@ importers:
       '@mosaicstack/types':
         specifier: workspace:*
         version: link:../types
+      commander:
+        specifier: ^13.0.0
+        version: 13.1.0
       drizzle-orm:
         specifier: ^0.45.1
         version: 0.45.1(@electric-sql/pglite@0.2.17)(@opentelemetry/api@1.9.0)(@types/better-sqlite3@7.6.13)(@types/pg@8.15.6)(better-sqlite3@12.8.0)(kysely@0.28.11)(postgres@3.4.8)
@@ -469,6 +472,9 @@ importers:
       '@mosaicstack/macp':
         specifier: workspace:*
         version: link:../macp
+      '@mosaicstack/memory':
+        specifier: workspace:*
+        version: link:../memory
       '@mosaicstack/prdy':
         specifier: workspace:*
         version: link:../prdy