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diff --git a/web/test/tab-filters.test.mjs b/web/test/tab-filters.test.mjs
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+// tab-filters.test.mjs — TDD tests for new tab filter functions
+//
+// Run with: node --test web/test/tab-filters.test.mjs
+
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { filterQueueTasks, filterReadyTasks, filterAllDoneTasks } from '../app.js';
+
+// ── Helpers ────────────────────────────────────────────────────────────────────
+
+function makeTask(state, created_at = null) {
+  return { id: state, name: `task-${state}`, state, created_at };
+}
+
+const ALL_STATES = [
+  'PENDING', 'QUEUED', 'RUNNING', 'READY', 'BLOCKED',
+  'COMPLETED', 'FAILED', 'TIMED_OUT', 'CANCELLED', 'BUDGET_EXCEEDED',
+];
+
+// ── filterQueueTasks ──────────────────────────────────────────────────────────
+
+describe('filterQueueTasks', () => {
+  it('includes QUEUED tasks', () => {
+    const tasks = ALL_STATES.map(s => makeTask(s));
+    const result = filterQueueTasks(tasks);
+    assert.ok(result.some(t => t.state === 'QUEUED'), 'QUEUED should be included');
+  });
+
+  it('includes PENDING tasks', () => {
+    const tasks = ALL_STATES.map(s => makeTask(s));
+    const result = filterQueueTasks(tasks);
+    assert.ok(result.some(t => t.state === 'PENDING'), 'PENDING should be included');
+  });
+
+  it('excludes all other states', () => {
+    const tasks = ALL_STATES.map(s => makeTask(s));
+    const result = filterQueueTasks(tasks);
+    for (const state of ['RUNNING', 'READY', 'BLOCKED', 'COMPLETED', 'FAILED', 'TIMED_OUT', 'CANCELLED', 'BUDGET_EXCEEDED']) {
+      assert.ok(!result.some(t => t.state === state), `${state} should be excluded`);
+    }
+  });
+
+  it('returns only QUEUED and PENDING (length 2 from all states)', () => {
+    const tasks = ALL_STATES.map(s => makeTask(s));
+    const result = filterQueueTasks(tasks);
+    assert.equal(result.length, 2);
+  });
+
+  it('returns empty array for empty input', () => {
+    assert.deepEqual(filterQueueTasks([]), []);
+  });
+});
+
+// ── filterReadyTasks ──────────────────────────────────────────────────────────
+
+describe('filterReadyTasks', () => {
+  it('includes READY tasks', () => {
+    const tasks = ALL_STATES.map(s => makeTask(s));
+    const result = filterReadyTasks(tasks);
+    assert.ok(result.some(t => t.state === 'READY'), 'READY should be included');
+  });
+
+  it('excludes all non-READY states', () => {
+    const tasks = ALL_STATES.map(s => makeTask(s));
+    const result = filterReadyTasks(tasks);
+    for (const state of ['PENDING', 'QUEUED', 'RUNNING', 'BLOCKED', 'COMPLETED', 'FAILED', 'TIMED_OUT', 'CANCELLED', 'BUDGET_EXCEEDED']) {
+      assert.ok(!result.some(t => t.state === state), `${state} should be excluded`);
+    }
+  });
+
+  it('returns only READY tasks (length 1 from all states)', () => {
+    const tasks = ALL_STATES.map(s => makeTask(s));
+    const result = filterReadyTasks(tasks);
+    assert.equal(result.length, 1);
+  });
+
+  it('returns empty array for empty input', () => {
+    assert.deepEqual(filterReadyTasks([]), []);
+  });
+});
+
+// ── filterAllDoneTasks ────────────────────────────────────────────────────────
+
+describe('filterAllDoneTasks', () => {
+  it('includes COMPLETED tasks within 24h', () => {
+    const now = new Date().toISOString();
+    const result = filterAllDoneTasks([makeTask('COMPLETED', now)]);
+    assert.equal(result.length, 1);
+  });
+
+  it('includes TIMED_OUT tasks within 24h', () => {
+    const now = new Date().toISOString();
+    const result = filterAllDoneTasks([makeTask('TIMED_OUT', now)]);
+    assert.equal(result.length, 1);
+  });
+
+  it('includes BUDGET_EXCEEDED tasks within 24h', () => {
+    const now = new Date().toISOString();
+    const result = filterAllDoneTasks([makeTask('BUDGET_EXCEEDED', now)]);
+    assert.equal(result.length, 1);
+  });
+
+  it('excludes non-done states', () => {
+    const now = new Date().toISOString();
+    const tasks = ALL_STATES.map(s => makeTask(s, now));
+    const result = filterAllDoneTasks(tasks);
+    for (const state of ['PENDING', 'QUEUED', 'RUNNING', 'READY', 'BLOCKED', 'FAILED', 'CANCELLED']) {
+      assert.ok(!result.some(t => t.state === state), `${state} should be excluded`);
+    }
+  });
+
+  it('excludes COMPLETED tasks older than 24h by default', () => {
+    const longAgo = new Date(Date.now() - 25 * 60 * 60 * 1000).toISOString();
+    const result = filterAllDoneTasks([makeTask('COMPLETED', longAgo)]);
+    assert.equal(result.length, 0, 'should hide tasks older than 24h');
+  });
+
+  it('includes tasks with null created_at by default (defensive)', () => {
+    const result = filterAllDoneTasks([makeTask('COMPLETED', null)]);
+    assert.equal(result.length, 1);
+  });
+
+  it('returns empty array for empty input', () => {
+    assert.deepEqual(filterAllDoneTasks([]), []);
+  });
+});