diff --git a/src/cli/index.ts b/src/cli/index.ts
index 6a9c488..c6dde62 100644
--- a/src/cli/index.ts
+++ b/src/cli/index.ts
@@ -1,7 +1,7 @@
 import { Command } from 'commander';
 import { init } from './commands/init.js';
 import { status } from './commands/status.js';
-import { memoryAdd, memorySearch, memoryList } from './commands/memory.js';
+import { memoryAdd, memorySearch, memoryList, type MemoryAddOptions } from './commands/memory.js';
 import { taskCreate, taskList, taskShow, taskClaim, taskDone } from './commands/task.js';
 import { handoffCreate, handoffRead, handoffList } from './commands/handoff.js';
 import { decisionCreate, decisionList } from './commands/decision.js';
@@ -146,6 +146,7 @@ export function createProgram(cwd: string): Command {
       } else {
         await memoryAdd(projectCwd, {
           title: options.title as string | undefined,
+          category: options.category as MemoryAddOptions['category'],
           content: options.content as string | undefined,
           relatedTasks,
           tokens,
diff --git a/tests/memory-cmd.test.ts b/tests/memory-cmd.test.ts
new file mode 100644
index 0000000..9e9c997
--- /dev/null
+++ b/tests/memory-cmd.test.ts
@@ -0,0 +1,85 @@
+/**
+ * Regression tests for `memory add` non-interactive path.
+ *
+ * Before the fix, `memoryAdd` called from the local-mode CLI branch omitted
+ * `category` in the options object. Because `memoryAdd` resolves category via
+ * `options.category ?? await select(...)`, the missing field caused it to open
+ * an @inquirer/prompts interactive select even when --category was supplied —
+ * which throws "User force closed the prompt with 0 null" in any non-TTY
+ * (agent/background) context.
+ *
+ * These tests call `memoryAdd` directly with all fields provided and assert
+ * that it completes without prompting. If prompting is triggered the test will
+ * throw in the non-TTY vitest environment, reproducing the original failure.
+ */
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { mkdtempSync, rmSync, readdirSync } from 'fs';
+import { tmpdir } from 'os';
+import { join } from 'path';
+import { memoryAdd } from '../src/cli/commands/memory.js';
+import { init } from '../src/cli/commands/init.js';
+import { listMemory } from '../src/core/services/memoryService.js';
+import { readEntity } from '../src/core/files.js';
+
+describe('memoryAdd — non-interactive (all flags supplied)', () => {
+  let cwd: string;
+
+  beforeEach(async () => {
+    cwd = mkdtempSync(join(tmpdir(), 'ah-mem-cmd-'));
+    await init(cwd, { yes: true, projectName: 'test' });
+  });
+
+  afterEach(() => {
+    rmSync(cwd, { recursive: true, force: true });
+  });
+
+  it('succeeds without prompting when title, category and content are provided', async () => {
+    // This must not throw — if it prompts it throws in non-TTY vitest.
+    await memoryAdd(cwd, {
+      title: 'Session summary',
+      category: 'implementation',
+      content: 'Completed TSK-0010 DNS cache work.',
+    });
+
+    const memories = listMemory(cwd);
+    expect(memories).toHaveLength(1);
+    expect(memories[0].title).toBe('Session summary');
+
+    // Verify category was persisted in the markdown frontmatter (index does
+    // not carry category, so we read the file directly).
+    const memDir = join(cwd, '.agenthub', 'memory');
+    const files = readdirSync(memDir).filter((f) => f.endsWith('.md'));
+    expect(files).toHaveLength(1);
+    const { frontmatter } = readEntity(join(memDir, files[0]));
+    expect(frontmatter.category).toBe('implementation');
+  });
+
+  it('succeeds with all activity-timeline flags (the exact agent invocation pattern)', async () => {
+    // Reproduces the exact flags agents pass after completing a task.
+    await memoryAdd(cwd, {
+      title: 'TSK-0010 implementation done',
+      category: 'implementation',
+      content: 'Implemented activity timeline. All tests green.',
+      relatedTasks: ['TSK-0010'],
+      tokens: 63576,
+      duration: 384987,
+      by: 'ops',
+    });
+
+    const memories = listMemory(cwd);
+    expect(memories).toHaveLength(1);
+    expect(memories[0].title).toBe('TSK-0010 implementation done');
+
+    // Verify category, relatedTasks, tokens, duration, by in the frontmatter.
+    const memDir = join(cwd, '.agenthub', 'memory');
+    const files = readdirSync(memDir).filter((f) => f.endsWith('.md'));
+    expect(files).toHaveLength(1);
+    const { frontmatter } = readEntity(join(memDir, files[0]));
+    expect(frontmatter.category).toBe('implementation');
+    expect(frontmatter.tokens).toBe(63576);
+    expect(frontmatter.duration).toBe(384987);
+    expect(frontmatter.by).toBe('ops');
+    // relatedTasks is a YAML sequence
+    expect(frontmatter.relatedTasks).toContain('TSK-0010');
+  });
+});