diff --git a/apps/daemon/src/cli.ts b/apps/daemon/src/cli.ts
index dd565f2ea..c4500a84b 100644
--- a/apps/daemon/src/cli.ts
+++ b/apps/daemon/src/cli.ts
@@ -11,6 +11,7 @@ import { parseDesignSystemRenameArgs } from './design-system-rename-args.js';
 import { runLiveArtifactsToolCli } from './tools-live-artifacts-cli.js';
 import { splitResearchSubcommand } from './research/cli-args.js';
 import { resolveDaemonUrl } from './daemon-url.js';
+import { buildSkillCatalogTree, parseSkillSummaries } from '@open-design/contracts';
 import { requestJsonIpc } from '@open-design/sidecar';
 import { SIDECAR_ENV, SIDECAR_MESSAGES } from '@open-design/sidecar-proto';
 
@@ -196,6 +197,7 @@ const RECOVERABLE_EXIT_CODES = {
   'plugin-requires-daemon':   71,
   'snapshot-stale':           72,
   'genui-surface-awaiting':   73,
+  'daemon-protocol-error':    74,
   'desktop-auth-pending':     74,
   'desktop-import-token-rejected': 75,
 };
@@ -5408,7 +5410,60 @@ async function runLibraryList(name, args) {
   }
 }
 
-async function runSkills(args)        { return runLibraryList('skills', args); }
+async function runSkills(args) {
+  if (args[0] === 'tree') return runSkillsTree(args.slice(1));
+  if (args.length === 0 || args[0] === 'help' || args.includes('--help') || args.includes('-h')) {
+    console.log(`Usage:
+  od skills list           List skills.
+  od skills show <id>      Print one skill.
+  od skills tree [--json]  Print skills grouped by mode and scenario.`);
+    process.exit(args.length === 0 ? 2 : 0);
+  }
+  return runLibraryList('skills', args);
+}
+
+async function runSkillsTree(args) {
+  if (args[0] === 'help' || args.includes('--help') || args.includes('-h')) {
+    console.log(`Usage:
+  od skills tree [--json]  Print skills grouped by mode and scenario.`);
+    process.exit(0);
+  }
+  const flags = parseFlags(args, { string: LIBRARY_STRING_FLAGS, boolean: LIBRARY_BOOLEAN_FLAGS });
+  const base = (await libraryDaemonUrl(flags)).replace(/\/$/, '');
+  const resp = await fetch(`${base}/api/skills`);
+  if (!resp.ok) return structuredHttpFailure(resp);
+  const data = await resp.json().catch(() => null);
+  let skills;
+  try {
+    skills = data && Array.isArray(data.skills) ? parseSkillSummaries(data.skills) : null;
+  } catch {
+    skills = null;
+  }
+  if (!skills) {
+    return exitWithStructuredError({
+      code: 'daemon-protocol-error',
+      message: 'Malformed /api/skills response: expected { skills: SkillSummary[] }',
+      data: { endpoint: '/api/skills' },
+    });
+  }
+  const tree = buildSkillCatalogTree(skills);
+  if (flags.json) return process.stdout.write(JSON.stringify(tree, null, 2) + '\n');
+  console.log(`Skills tree (${tree.total})`);
+  for (const mode of tree.modes) {
+    console.log(`${mode.label} (${mode.count})`);
+    for (const scenario of mode.scenarios) {
+      console.log(`  ${scenario.label} (${scenario.count})`);
+      for (const skill of scenario.skills) {
+        const metadata = [
+          skill.platform,
+          skill.previewType,
+          skill.designSystemRequired ? 'design system' : null,
+        ].filter(Boolean).join(' · ');
+        console.log(`    - ${skill.id}${metadata ? ` [${metadata}]` : ''}`);
+      }
+    }
+  }
+}
 async function runCraft(args)         { return runLibraryList('craft', args); }
 
 async function runDesignSystems(args) {
diff --git a/apps/daemon/tests/skills-cli.test.ts b/apps/daemon/tests/skills-cli.test.ts
new file mode 100644
index 000000000..0e72ba4ae
--- /dev/null
+++ b/apps/daemon/tests/skills-cli.test.ts
@@ -0,0 +1,210 @@
+import { createServer, type IncomingMessage, type ServerResponse } from 'node:http';
+import { execFile } from 'node:child_process';
+import { fileURLToPath } from 'node:url';
+import { promisify } from 'node:util';
+import { describe, expect, it } from 'vitest';
+
+const execFileAsync = promisify(execFile);
+const daemonRoot = fileURLToPath(new URL('..', import.meta.url));
+const cliEntry = fileURLToPath(new URL('../src/cli.ts', import.meta.url));
+
+async function withSkillsServer<T>(
+  handler: (req: IncomingMessage, res: ServerResponse) => void,
+  run: (baseUrl: string) => Promise<T>,
+): Promise<T> {
+  const server = createServer(handler);
+  await new Promise<void>((resolve, reject) => {
+    server.once('error', reject);
+    server.listen(0, '127.0.0.1', () => resolve());
+  });
+  const address = server.address();
+  if (!address || typeof address === 'string') {
+    server.close();
+    throw new Error('test server did not bind to a TCP port');
+  }
+  try {
+    return await run(`http://127.0.0.1:${address.port}`);
+  } finally {
+    await new Promise<void>((resolve) => server.close(() => resolve()));
+  }
+}
+
+describe('od skills CLI', () => {
+  it('prints the skills tree for the plain command', async () => {
+    await withSkillsServer(
+      (_req, res) => {
+        res.writeHead(200, { 'content-type': 'application/json' });
+        res.end(JSON.stringify({
+          skills: [
+            {
+              id: 'dashboard',
+              name: 'Dashboard',
+              description: 'A dashboard skill.',
+              triggers: [],
+              mode: 'prototype',
+              scenario: 'operation',
+              platform: 'desktop',
+              previewType: 'html',
+              designSystemRequired: true,
+              defaultFor: [],
+              upstream: null,
+              hasBody: true,
+              examplePrompt: 'Build a dashboard.',
+              aggregatesExamples: false,
+            },
+          ],
+        }));
+      },
+      async (baseUrl) => {
+        const result = await execFileAsync(
+          process.execPath,
+          [
+            '--import',
+            'tsx',
+            cliEntry,
+            'skills',
+            'tree',
+            '--daemon-url',
+            baseUrl,
+          ],
+          {
+            cwd: daemonRoot,
+            env: process.env,
+          },
+        );
+
+        expect(result.stdout).toContain('Skills tree (1)');
+        expect(result.stdout).toContain('Prototype (1)');
+        expect(result.stdout).toContain('Operation (1)');
+        expect(result.stdout).toContain('- dashboard [desktop · html · design system]');
+        expect(result.stderr).toBe('');
+      },
+    );
+  });
+
+  it('prints skills tree help without contacting the daemon', async () => {
+    const result = await execFileAsync(
+      process.execPath,
+      [
+        '--import',
+        'tsx',
+        cliEntry,
+        'skills',
+        'tree',
+        '--help',
+        '--daemon-url',
+        'http://127.0.0.1:1',
+      ],
+      {
+        cwd: daemonRoot,
+        env: process.env,
+      },
+    );
+
+    expect(result.stdout).toContain('Usage:');
+    expect(result.stdout).toContain('od skills tree [--json]');
+    expect(result.stderr).toBe('');
+  });
+
+  it('rejects malformed skills tree responses', async () => {
+    await withSkillsServer(
+      (_req, res) => {
+        res.writeHead(200, { 'content-type': 'application/json' });
+        res.end(JSON.stringify({ ok: true }));
+      },
+      async (baseUrl) => {
+        try {
+          await execFileAsync(
+            process.execPath,
+            [
+              '--import',
+              'tsx',
+              cliEntry,
+              'skills',
+              'tree',
+              '--json',
+              '--daemon-url',
+              baseUrl,
+            ],
+            {
+              cwd: daemonRoot,
+              env: process.env,
+            },
+          );
+          throw new Error('skills tree command unexpectedly succeeded');
+        } catch (error: unknown) {
+          const failed = error as { code?: number; stderr?: string; stdout?: string };
+          expect(failed.code).toBe(74);
+          expect(failed.stdout ?? '').toBe('');
+          const envelope = JSON.parse(failed.stderr ?? '{}') as {
+            error?: { code?: string; message?: string; data?: { endpoint?: string } };
+          };
+          expect(envelope.error?.code).toBe('daemon-protocol-error');
+          expect(envelope.error?.message).toContain('Malformed /api/skills response');
+          expect(envelope.error?.data?.endpoint).toBe('/api/skills');
+        }
+      },
+    );
+  });
+
+  it('rejects malformed skill elements in skills tree responses', async () => {
+    await withSkillsServer(
+      (_req, res) => {
+        res.writeHead(200, { 'content-type': 'application/json' });
+        res.end(JSON.stringify({
+          skills: [
+            {
+              id: 'dashboard',
+              name: 'Dashboard',
+              description: 'A dashboard skill.',
+              triggers: [],
+              mode: 'prototype',
+              scenario: 'operation',
+              platform: 'desktop',
+              previewType: 'html',
+              designSystemRequired: true,
+              defaultFor: [],
+              upstream: null,
+              hasBody: true,
+              examplePrompt: 'Build a dashboard.',
+              aggregatesExamples: false,
+            },
+            { id: 'broken', mode: 'prototype' },
+          ],
+        }));
+      },
+      async (baseUrl) => {
+        try {
+          await execFileAsync(
+            process.execPath,
+            [
+              '--import',
+              'tsx',
+              cliEntry,
+              'skills',
+              'tree',
+              '--json',
+              '--daemon-url',
+              baseUrl,
+            ],
+            {
+              cwd: daemonRoot,
+              env: process.env,
+            },
+          );
+          throw new Error('skills tree command unexpectedly succeeded');
+        } catch (error: unknown) {
+          const failed = error as { code?: number; stderr?: string; stdout?: string };
+          expect(failed.code).toBe(74);
+          expect(failed.stdout ?? '').toBe('');
+          const envelope = JSON.parse(failed.stderr ?? '{}') as {
+            error?: { code?: string; message?: string; data?: { endpoint?: string } };
+          };
+          expect(envelope.error?.code).toBe('daemon-protocol-error');
+          expect(envelope.error?.message).toContain('Malformed /api/skills response');
+          expect(envelope.error?.data?.endpoint).toBe('/api/skills');
+        }
+      },
+    );
+  });
+});
diff --git a/apps/web/src/components/IntegrationsView.tsx b/apps/web/src/components/IntegrationsView.tsx
index 73b572361..de645fd9b 100644
--- a/apps/web/src/components/IntegrationsView.tsx
+++ b/apps/web/src/components/IntegrationsView.tsx
@@ -1,9 +1,13 @@
-import { useEffect, useRef, useState } from 'react';
-import type { AppConfig } from '../types';
+import { useEffect, useMemo, useRef, useState } from 'react';
+import type { AppConfig, SkillSummary } from '../types';
+import {
+  buildSkillCatalogTree,
+  type SkillCatalogTree,
+  type SkillCatalogTreeSkill,
+} from '@open-design/contracts';
 import { useAnalytics } from '../analytics/provider';
 import {
   trackIntegrationsConnectorsTabClick,
-  trackIntegrationsSkillsTabClick,
   trackIntegrationsTabClick,
   trackPageView,
   trackSettingsConnectorAuthResult,
@@ -12,7 +16,13 @@ import { ConnectorSection } from './SettingsDialog';
 import { Icon } from './Icon';
 import { McpClientSection } from './McpClientSection';
 import { UseEverywhereGuidePanel } from './UseEverywhereModal';
-import { useT } from '../i18n';
+import { fetchSkills } from '../providers/registry';
+import { useI18n, useT } from '../i18n';
+import {
+  localizeSkillDescription,
+  localizeSkillName,
+  localizeSkillPrompt,
+} from '../i18n/content';
 
 export type IntegrationTab = 'mcp' | 'connectors' | 'skills' | 'use-everywhere';
 
@@ -148,7 +158,7 @@ export function IntegrationsView({
           />
         ) : null}
 
-        {activeTab === 'skills' ? <SkillsComingSoonPanel /> : null}
+        {activeTab === 'skills' ? <SkillsCatalogTreePanel /> : null}
 
         {activeTab === 'use-everywhere' ? (
           <div className="integrations-view__use-everywhere">
@@ -163,35 +173,783 @@ export function IntegrationsView({
   );
 }
 
-function SkillsComingSoonPanel() {
+function SkillsCatalogTreePanel() {
   const t = useT();
-  const analytics = useAnalytics();
+  const { locale } = useI18n();
+  const [skills, setSkills] = useState<SkillSummary[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [loadError, setLoadError] = useState(false);
+  const [search, setSearch] = useState('');
+  const [viewMode, setViewMode] = useState<SkillCatalogViewMode>('list');
+  const [filters, setFilters] = useState<SkillCatalogFilters>(DEFAULT_SKILL_CATALOG_FILTERS);
+  const [selectedSkillId, setSelectedSkillId] = useState<string | null>(null);
+
+  useEffect(() => {
+    let cancelled = false;
+    setLoading(true);
+    setLoadError(false);
+    void fetchSkills({ throwOnError: true })
+      .then((list) => {
+        if (cancelled) return;
+        setSkills(list);
+      })
+      .catch(() => {
+        if (cancelled) return;
+        setSkills([]);
+        setLoadError(true);
+      })
+      .finally(() => {
+        if (!cancelled) setLoading(false);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, []);
+
+  const filteredSkills = useMemo(() => {
+    const query = search.trim().toLowerCase();
+    return skills.filter((skill) => {
+      if (filters.mode !== 'all' && skill.mode !== filters.mode) return false;
+      if (filters.scenario !== 'all' && skillCatalogScenario(skill) !== filters.scenario) return false;
+      if (filters.category !== 'all' && (skill.category ?? '') !== filters.category) return false;
+      if (filters.platform !== 'all' && (skill.platform ?? '') !== filters.platform) return false;
+      if (filters.previewType !== 'all' && skill.previewType !== filters.previewType) return false;
+      if (filters.designSystem === 'required' && !skill.designSystemRequired) return false;
+      if (filters.designSystem === 'optional' && skill.designSystemRequired) return false;
+      if (!query) return true;
+      const name = localizeSkillName(locale, skill) || skill.name;
+      const description = localizeSkillDescription(locale, skill);
+      const haystack = [
+        skill.id,
+        name,
+        description,
+        skill.mode,
+        skillCatalogScenario(skill),
+        skill.platform ?? '',
+        skill.previewType,
+        skill.category ?? '',
+        ...(skill.triggers ?? []),
+      ].join('\n');
+      return haystack.toLowerCase().includes(query);
+    });
+  }, [filters, locale, search, skills]);
+
+  const tree = useMemo(
+    () => buildSkillCatalogTree(filteredSkills),
+    [filteredSkills],
+  );
+  const filterOptions = useMemo(
+    () => buildSkillCatalogFilterOptions(skills),
+    [skills],
+  );
+
+  const selectedSkill = useMemo(() => {
+    if (!selectedSkillId) return null;
+    return filteredSkills.find((skill) => skill.id === selectedSkillId) ?? null;
+  }, [filteredSkills, selectedSkillId]);
+
+  useEffect(() => {
+    if (selectedSkillId && filteredSkills.some((skill) => skill.id === selectedSkillId)) return;
+    if (selectedSkillId) setSelectedSkillId(null);
+  }, [filteredSkills, selectedSkillId]);
+
   return (
     <section
-      className="integrations-view__coming-soon"
+      className="integrations-skills-tree"
       aria-labelledby="integration-skills-title"
-      onClick={() =>
-        trackIntegrationsSkillsTabClick(analytics.track, {
-          page_name: 'integrations',
-          area: 'skills_tab',
-          element: 'coming_soon',
-        })
-      }
     >
-      <div className="integrations-view__coming-icon" aria-hidden="true">
-        <Icon name="sparkles" size={22} />
-      </div>
-      <div>
-        <p className="integrations-view__coming-kicker">{t('tasks.comingSoon')}</p>
-        <h2 id="integration-skills-title">{t('integrations.skillsTitle')}</h2>
+      <header className="integrations-skills-tree__head">
+        <div>
+          <p className="integrations-view__coming-kicker">{t('integrations.tabLabel.skills')}</p>
+          <h2 id="integration-skills-title">{t('integrations.skillsTitle')}</h2>
+        </div>
+        <div className="integrations-skills-tree__tools">
+          <div className="integrations-skills-tree__view-toggle" aria-label={t('integrations.skillsViewMode')}>
+            <button
+              type="button"
+              className={viewMode === 'tree' ? 'is-active' : ''}
+              onClick={() => setViewMode('tree')}
+            >
+              {t('integrations.skillsTreeView')}
+            </button>
+            <button
+              type="button"
+              className={viewMode === 'list' ? 'is-active' : ''}
+              onClick={() => setViewMode('list')}
+            >
+              {t('integrations.skillsListView')}
+            </button>
+          </div>
+          <label className="integrations-skills-tree__search">
+            <Icon name="search" size={13} />
+            <input
+              type="search"
+              value={search}
+              onChange={(event) => setSearch(event.target.value)}
+              placeholder={t('integrations.skillsSearch')}
+            />
+          </label>
+        </div>
+      </header>
+      <div className="integrations-skills-tree__summary">
         <p>
           {t('integrations.skillsBody')}
         </p>
+        <span>{tree.total}</span>
       </div>
+      <SkillCatalogFiltersBar
+        filters={filters}
+        options={filterOptions}
+        onChange={setFilters}
+      />
+      {loading ? (
+        <div className="integrations-skills-tree__empty">
+          {t('integrations.skillsLoading')}
+        </div>
+      ) : loadError ? (
+        <div className="integrations-skills-tree__empty">
+          {t('integrations.skillsLoadFailed')}
+        </div>
+      ) : tree.total === 0 ? (
+        <div className="integrations-skills-tree__empty">
+          {t('integrations.skillsNoFilterResults')}
+        </div>
+      ) : viewMode === 'list' ? (
+        <SkillListView
+          skills={filteredSkills}
+          selectedSkill={selectedSkill}
+          selectedSkillId={selectedSkillId}
+          onSelectSkill={setSelectedSkillId}
+        />
+      ) : (
+        <SkillTreeGraph
+          tree={tree}
+          selectedSkillId={selectedSkillId}
+          selectedSkill={selectedSkill}
+          onSelectSkill={setSelectedSkillId}
+        />
+      )}
     </section>
   );
 }
 
+type SkillCatalogViewMode = 'tree' | 'list';
+type SkillDesignSystemFilter = 'all' | 'required' | 'optional';
+
+interface SkillCatalogFilters {
+  mode: string;
+  scenario: string;
+  category: string;
+  platform: string;
+  previewType: string;
+  designSystem: SkillDesignSystemFilter;
+}
+
+const DEFAULT_SKILL_CATALOG_FILTERS: SkillCatalogFilters = {
+  mode: 'all',
+  scenario: 'all',
+  category: 'all',
+  platform: 'all',
+  previewType: 'all',
+  designSystem: 'all',
+};
+
+interface SkillCatalogFilterOption {
+  id: string;
+  label: string;
+  count: number;
+}
+
+interface SkillCatalogFilterOptions {
+  modes: SkillCatalogFilterOption[];
+  scenarios: SkillCatalogFilterOption[];
+  categories: SkillCatalogFilterOption[];
+  platforms: SkillCatalogFilterOption[];
+  previewTypes: SkillCatalogFilterOption[];
+}
+
+function SkillCatalogFiltersBar({
+  filters,
+  options,
+  onChange,
+}: {
+  filters: SkillCatalogFilters;
+  options: SkillCatalogFilterOptions;
+  onChange: (filters: SkillCatalogFilters) => void;
+}) {
+  const t = useT();
+
+  const update = <K extends keyof SkillCatalogFilters>(key: K, value: SkillCatalogFilters[K]) => {
+    onChange({ ...filters, [key]: value });
+  };
+
+  return (
+    <div className="integrations-skills-tree__filters" aria-label={t('integrations.skillsFilters')}>
+      <SkillCatalogSelect
+        label={t('integrations.skillsFilterMode')}
+        value={filters.mode}
+        options={options.modes}
+        onChange={(value) => update('mode', value)}
+      />
+      <SkillCatalogSelect
+        label={t('integrations.skillsFilterScenario')}
+        value={filters.scenario}
+        options={options.scenarios}
+        onChange={(value) => update('scenario', value)}
+      />
+      <SkillCatalogSelect
+        label={t('integrations.skillsFilterCategory')}
+        value={filters.category}
+        options={options.categories}
+        onChange={(value) => update('category', value)}
+      />
+      <SkillCatalogSelect
+        label={t('integrations.skillsFilterPlatform')}
+        value={filters.platform}
+        options={options.platforms}
+        onChange={(value) => update('platform', value)}
+      />
+      <SkillCatalogSelect
+        label={t('integrations.skillsFilterPreview')}
+        value={filters.previewType}
+        options={options.previewTypes}
+        onChange={(value) => update('previewType', value)}
+      />
+      <label className="integrations-skills-tree__filter">
+        <span>{t('integrations.skillsFilterDesignSystem')}</span>
+        <select
+          value={filters.designSystem}
+          onChange={(event) => update('designSystem', event.target.value as SkillDesignSystemFilter)}
+          data-testid="integrations-skill-filter-design-system"
+        >
+          <option value="all">{t('integrations.skillsFilterAll')}</option>
+          <option value="required">{t('integrations.skillsTreeDesignSystemRequired')}</option>
+          <option value="optional">{t('integrations.skillsTreeDesignSystemOptional')}</option>
+        </select>
+      </label>
+    </div>
+  );
+}
+
+function SkillCatalogSelect({
+  label,
+  value,
+  options,
+  onChange,
+}: {
+  label: string;
+  value: string;
+  options: SkillCatalogFilterOption[];
+  onChange: (value: string) => void;
+}) {
+  const t = useT();
+
+  return (
+    <label className="integrations-skills-tree__filter">
+      <span>{label}</span>
+      <select value={value} onChange={(event) => onChange(event.target.value)}>
+        <option value="all">{t('integrations.skillsFilterAll')}</option>
+        {options.map((option) => (
+          <option key={option.id} value={option.id}>
+            {option.label} ({option.count})
+          </option>
+        ))}
+      </select>
+    </label>
+  );
+}
+
+function SkillListView({
+  skills,
+  selectedSkill,
+  selectedSkillId,
+  onSelectSkill,
+}: {
+  skills: SkillSummary[];
+  selectedSkill: SkillSummary | null;
+  selectedSkillId: string | null;
+  onSelectSkill: (skillId: string) => void;
+}) {
+  const t = useT();
+  const { locale } = useI18n();
+  const selectedTreeSkill = selectedSkill
+    ? skillSummaryToTreeSkill(selectedSkill)
+    : null;
+
+  return (
+    <div className="integrations-skills-tree__grid">
+      <div className="integrations-skills-tree__list" role="list">
+        {skills.map((skill) => {
+          const name = localizeSkillName(locale, skill) || skill.name || skill.id;
+          const description = localizeSkillDescription(locale, skill);
+          const isActive = skill.id === selectedSkillId;
+
+          return (
+            <button
+              key={skill.id}
+              type="button"
+              className={`integrations-skills-tree__list-row${isActive ? ' is-active' : ''}`}
+              onClick={() => onSelectSkill(skill.id)}
+              aria-pressed={isActive}
+              data-testid={`integrations-skill-list-row-${skill.id}`}
+            >
+              <span className="integrations-skills-tree__list-title">{name}</span>
+              {description ? (
+                <span className="integrations-skills-tree__list-description">{description}</span>
+              ) : null}
+              <span className="integrations-skills-tree__list-meta">
+                <span>{skill.mode}</span>
+                <span>{skillCatalogScenario(skill)}</span>
+                {skill.category ? <span>{skill.category}</span> : null}
+                {skill.platform ? <span>{skill.platform}</span> : null}
+                <span>{skill.previewType}</span>
+                <span>
+                  {skill.designSystemRequired
+                    ? t('integrations.skillsTreeDesignSystemRequired')
+                    : t('integrations.skillsTreeDesignSystemOptional')}
+                </span>
+              </span>
+            </button>
+          );
+        })}
+      </div>
+      <SkillTreeInfoPanel skill={selectedTreeSkill} emptyLabel={t('integrations.skillsListEmpty')} />
+    </div>
+  );
+}
+
+interface SkillTreeGraphProps {
+  tree: SkillCatalogTree;
+  selectedSkillId: string | null;
+  selectedSkill: SkillSummary | null;
+  onSelectSkill: (skillId: string) => void;
+}
+
+function SkillTreeGraph({
+  tree,
+  selectedSkillId,
+  selectedSkill,
+  onSelectSkill,
+}: SkillTreeGraphProps) {
+  const t = useT();
+  const { locale } = useI18n();
+  const layout = useMemo(
+    () => buildSkillTreeSvgLayout(tree, selectedSkillId, locale, {
+      mode: t('integrations.skillsTreeGuideMode'),
+      scenario: t('integrations.skillsTreeGuideScenario'),
+      skill: t('integrations.skillsTreeGuideSkill'),
+    }),
+    [locale, selectedSkillId, t, tree],
+  );
+  const selectedTreeSkill = selectedSkill
+    ? skillSummaryToTreeSkill(selectedSkill)
+    : null;
+
+  return (
+    <div className="integrations-skills-tree__grid">
+      <div className="integrations-skills-tree__canvas">
+        <svg
+          className="integrations-skills-tree__svg"
+          viewBox={`0 0 ${layout.width} ${layout.height}`}
+          role="img"
+          aria-label={t('integrations.skillsTreeView')}
+          style={{ minWidth: layout.width }}
+        >
+          <defs>
+            <filter id="integrations-skill-node-glow" x="-80%" y="-80%" width="260%" height="260%">
+              <feGaussianBlur stdDeviation="6" result="blur" />
+              <feMerge>
+                <feMergeNode in="blur" />
+                <feMergeNode in="SourceGraphic" />
+              </feMerge>
+            </filter>
+          </defs>
+          {layout.guides.map((guide) => (
+            <g key={guide.id} className="integrations-skills-tree__guide">
+              <line x1={56} y1={guide.y} x2={layout.width - 24} y2={guide.y} />
+              <text x={24} y={guide.y + 4}>{guide.label}</text>
+            </g>
+          ))}
+          {layout.edges.map((edge) => (
+            <g
+              key={edge.id}
+              className={`integrations-skills-tree__edge${edge.active ? ' is-active' : ''}`}
+            >
+              <path className="integrations-skills-tree__edge-aura" d={edge.d} />
+              <path className="integrations-skills-tree__edge-base" d={edge.d} />
+            </g>
+          ))}
+          {layout.nodes.map((node) => {
+            const interactive = Boolean(node.skillId);
+            return (
+              <g
+                key={node.id}
+                className={`integrations-skills-tree__svg-node is-${node.kind}${interactive ? ' is-interactive' : ' is-branch'}${node.active ? ' is-active' : ''}${node.onPath ? ' is-on-path' : ''}`}
+                transform={`translate(${node.x} ${node.y})`}
+                role={interactive ? 'button' : undefined}
+                tabIndex={interactive ? 0 : undefined}
+                aria-pressed={interactive ? node.active : undefined}
+                onClick={interactive ? () => onSelectSkill(node.skillId!) : undefined}
+                onKeyDown={interactive ? (event) => {
+                  if (event.key !== 'Enter' && event.key !== ' ') return;
+                  event.preventDefault();
+                  onSelectSkill(node.skillId!);
+                } : undefined}
+                data-testid={node.kind === 'skill' ? `integrations-skill-node-${node.skillId}` : undefined}
+              >
+                <title>{node.title}</title>
+                {node.active ? <circle className="integrations-skills-tree__svg-glow" r={node.radius + 14} /> : null}
+                {interactive ? <circle className="integrations-skills-tree__svg-affordance" r={node.radius + 8} /> : null}
+                {interactive && !node.active ? <circle className="integrations-skills-tree__svg-pulse" r={node.radius + 6} /> : null}
+                <circle className="integrations-skills-tree__svg-core" r={node.radius} />
+                {interactive ? (
+                  <circle className="integrations-skills-tree__svg-ring" r={node.radius - 7} />
+                ) : (
+                  <circle className="integrations-skills-tree__svg-branch-ring" r={node.radius - 9} />
+                )}
+                <text className="integrations-skills-tree__svg-label" y={node.kind === 'skill' ? -3 : -5}>
+                  {node.label}
+                </text>
+                <text className="integrations-skills-tree__svg-sub" y={node.kind === 'skill' ? 12 : 11}>
+                  {node.subLabel}
+                </text>
+              </g>
+            );
+          })}
+        </svg>
+        <div className="integrations-skills-tree__legend" aria-hidden>
+          <span><i className="is-mode" /> {t('integrations.skillsTreeLegendMode')}</span>
+          <span><i className="is-scenario" /> {t('integrations.skillsTreeLegendScenario')}</span>
+          <span><i className="is-skill" /> {t('integrations.skillsTreeLegendSkill')}</span>
+        </div>
+      </div>
+      <SkillTreeInfoPanel skill={selectedTreeSkill} emptyLabel={t('integrations.skillsTreeEmpty')} />
+    </div>
+  );
+}
+
+interface SkillTreeSvgNode {
+  id: string;
+  kind: 'mode' | 'scenario' | 'skill';
+  x: number;
+  y: number;
+  radius: number;
+  label: string;
+  subLabel: string;
+  title: string;
+  skillId: string | null;
+  active: boolean;
+  onPath: boolean;
+}
+
+interface SkillTreeSvgEdge {
+  id: string;
+  d: string;
+  x1: number;
+  y1: number;
+  x2: number;
+  y2: number;
+  active: boolean;
+}
+
+interface SkillTreeSvgGuide {
+  id: string;
+  label: string;
+  y: number;
+}
+
+interface SkillTreeSvgLayout {
+  width: number;
+  height: number;
+  nodes: SkillTreeSvgNode[];
+  edges: SkillTreeSvgEdge[];
+  guides: SkillTreeSvgGuide[];
+}
+
+function buildSkillTreeSvgLayout(
+  tree: SkillCatalogTree,
+  selectedSkillId: string | null,
+  locale: ReturnType<typeof useI18n>['locale'],
+  guideLabels: {
+    mode: string;
+    scenario: string;
+    skill: string;
+  },
+): SkillTreeSvgLayout {
+  const modeGap = 330;
+  const modeStartX = 170;
+  const modeY = 74;
+  const scenarioStartY = 178;
+  const scenarioGap = 118;
+  const skillRowGap = 78;
+  const skillColOffset = 74;
+  const nodes: SkillTreeSvgNode[] = [];
+  const edges: SkillTreeSvgEdge[] = [];
+  let height = 620;
+
+  tree.modes.forEach((mode, modeIndex) => {
+    const modeX = modeStartX + modeIndex * modeGap;
+    const modeContainsSelected = mode.scenarios.some((scenario) =>
+      scenario.skills.some((skill) => skill.id === selectedSkillId),
+    );
+
+    nodes.push({
+      id: `mode-${mode.id}`,
+      kind: 'mode',
+      x: modeX,
+      y: modeY,
+      radius: 34,
+      label: truncateSvgLabel(mode.label, 10),
+      subLabel: String(mode.count),
+      title: `${mode.label} · ${mode.count}`,
+      skillId: null,
+      active: false,
+      onPath: modeContainsSelected,
+    });
+
+    let cursorY = scenarioStartY;
+    mode.scenarios.forEach((scenario, scenarioIndex) => {
+      const scenarioContainsSelected = scenario.skills.some((skill) => skill.id === selectedSkillId);
+      nodes.push({
+        id: `scenario-${mode.id}-${scenario.id}`,
+        kind: 'scenario',
+        x: modeX,
+        y: cursorY,
+        radius: 27,
+        label: truncateSvgLabel(scenario.label, 9),
+        subLabel: String(scenario.count),
+        title: `${mode.label} / ${scenario.label} · ${scenario.count}`,
+        skillId: null,
+        active: false,
+        onPath: scenarioContainsSelected,
+      });
+      edges.push({
+        id: `edge-${mode.id}-${scenario.id}`,
+        d: skillTreeConnectorPath(modeX, modeY + 34, modeX, cursorY - 27),
+        x1: modeX,
+        y1: modeY + 34,
+        x2: modeX,
+        y2: cursorY - 27,
+        active: scenarioContainsSelected,
+      });
+
+      scenario.skills.forEach((skill, skillIndex) => {
+        const row = Math.floor(skillIndex / 2);
+        const side = skillIndex % 2 === 0 ? -1 : 1;
+        const skillX = modeX + side * skillColOffset;
+        const skillY = cursorY + 72 + row * skillRowGap;
+        const name = localizeSkillName(locale, skill.skill) || skill.id;
+        const active = skill.id === selectedSkillId;
+        nodes.push({
+          id: `skill-${skill.id}`,
+          kind: 'skill',
+          x: skillX,
+          y: skillY,
+          radius: 27,
+          label: truncateSvgLabel(name, 8),
+          subLabel: skill.platform ?? skill.previewType,
+          title: `${name} · ${skill.platform ?? skill.previewType}`,
+          skillId: skill.id,
+          active,
+          onPath: active,
+        });
+        edges.push({
+          id: `edge-${scenario.id}-${skill.id}`,
+          d: skillTreeLeafConnectorPath(modeX, cursorY + 27, skillX, skillY, 27),
+          x1: modeX,
+          y1: cursorY + 27,
+          x2: skillX,
+          y2: skillY,
+          active,
+        });
+      });
+
+      const rows = Math.max(1, Math.ceil(scenario.skills.length / 2));
+      cursorY += 72 + rows * skillRowGap + scenarioGap;
+    });
+    height = Math.max(height, cursorY + 40);
+  });
+
+  const width = Math.max(720, modeStartX + Math.max(0, tree.modes.length - 1) * modeGap + 190);
+
+  return {
+    width,
+    height,
+    nodes,
+    edges,
+    guides: [
+      { id: 'mode', label: guideLabels.mode, y: modeY },
+      { id: 'scenario', label: guideLabels.scenario, y: scenarioStartY },
+      { id: 'skill', label: guideLabels.skill, y: scenarioStartY + 72 },
+    ],
+  };
+}
+
+function truncateSvgLabel(value: string, max: number): string {
+  return value.length > max ? `${value.slice(0, Math.max(1, max - 1))}…` : value;
+}
+
+function skillTreeConnectorPath(
+  x1: number,
+  y1: number,
+  x2: number,
+  y2: number,
+): string {
+  if (Math.abs(x2 - x1) < 1) {
+    return `M ${x1} ${y1} V ${y2}`;
+  }
+
+  const direction = x2 > x1 ? 1 : -1;
+  const distanceX = Math.abs(x2 - x1);
+  const distanceY = Math.abs(y2 - y1);
+  const corner = Math.min(18, distanceX / 2, distanceY / 2);
+  const busY = y1 + Math.max(28, Math.min(64, distanceY * 0.48));
+  const c1x = x1 + direction * corner;
+  const c2x = x2 - direction * corner;
+  const c2y = y2 - corner;
+
+  return [
+    `M ${x1} ${y1}`,
+    `V ${busY - corner}`,
+    `Q ${x1} ${busY} ${c1x} ${busY}`,
+    `H ${c2x}`,
+    `Q ${x2} ${busY} ${x2} ${busY + corner}`,
+    `V ${c2y}`,
+    `Q ${x2} ${y2} ${x2} ${y2}`,
+  ].join(' ');
+}
+
+function skillTreeLeafConnectorPath(
+  x1: number,
+  y1: number,
+  x2: number,
+  y2: number,
+  targetRadius: number,
+): string {
+  if (Math.abs(x2 - x1) < 1) {
+    return `M ${x1} ${y1} V ${y2 - targetRadius}`;
+  }
+
+  const direction = x2 > x1 ? 1 : -1;
+  const endX = x2 - direction * targetRadius;
+  const distanceX = Math.abs(endX - x1);
+  const distanceY = Math.abs(y2 - y1);
+  const corner = Math.min(16, distanceX / 2, distanceY / 2);
+
+  return [
+    `M ${x1} ${y1}`,
+    `V ${y2 - corner}`,
+    `Q ${x1} ${y2} ${x1 + direction * corner} ${y2}`,
+    `H ${endX}`,
+  ].join(' ');
+}
+
+function SkillTreeInfoPanel({
+  skill,
+  emptyLabel,
+}: {
+  skill: SkillCatalogTreeSkill | null;
+  emptyLabel: string;
+}) {
+  const t = useT();
+  const { locale } = useI18n();
+
+  if (!skill) {
+    return (
+      <aside className="integrations-skills-tree__detail is-empty">
+        {emptyLabel}
+      </aside>
+    );
+  }
+
+  const name = localizeSkillName(locale, skill.skill) || skill.id;
+  const description = localizeSkillDescription(locale, skill.skill);
+  const prompt = localizeSkillPrompt(locale, skill.skill) || skill.examplePrompt;
+
+  return (
+    <aside className="integrations-skills-tree__detail" data-testid="integrations-skill-detail">
+      <p className="integrations-skills-tree__detail-kicker">
+        {skill.mode} / {skill.scenario}
+      </p>
+      <h3>{name}</h3>
+      {description ? <p>{description}</p> : null}
+      <dl>
+        <div>
+          <dt>{t('integrations.skillsTreePlatform')}</dt>
+          <dd>{skill.platform ?? '—'}</dd>
+        </div>
+        <div>
+          <dt>{t('integrations.skillsTreePreviewType')}</dt>
+          <dd>{skill.previewType}</dd>
+        </div>
+        <div>
+          <dt>{t('integrations.skillsTreeDesignSystem')}</dt>
+          <dd>
+            {skill.designSystemRequired
+              ? t('integrations.skillsTreeDesignSystemRequired')
+              : t('integrations.skillsTreeDesignSystemOptional')}
+          </dd>
+        </div>
+        <div>
+          <dt>{t('integrations.skillsTreeSource')}</dt>
+          <dd>{skill.source ?? 'built-in'}</dd>
+        </div>
+      </dl>
+      {prompt ? (
+        <div className="integrations-skills-tree__prompt">
+          <span>{t('integrations.skillsTreeExamplePrompt')}</span>
+          <p>{prompt}</p>
+        </div>
+      ) : null}
+    </aside>
+  );
+}
+
+function skillSummaryToTreeSkill(skill: SkillSummary): SkillCatalogTreeSkill {
+  return buildSkillCatalogTree([skill]).modes[0]!.scenarios[0]!.skills[0]!;
+}
+
+function skillCatalogScenario(skill: SkillSummary): string {
+  return skill.scenario?.trim() || 'general';
+}
+
+function buildSkillCatalogFilterOptions(skills: SkillSummary[]): SkillCatalogFilterOptions {
+  return {
+    modes: buildSkillCatalogFacetOptions(skills.map((skill) => skill.mode)),
+    scenarios: buildSkillCatalogFacetOptions(skills.map((skill) => skillCatalogScenario(skill))),
+    categories: buildSkillCatalogFacetOptions(skills.map((skill) => skill.category)),
+    platforms: buildSkillCatalogFacetOptions(skills.map((skill) => skill.platform)),
+    previewTypes: buildSkillCatalogFacetOptions(skills.map((skill) => skill.previewType)),
+  };
+}
+
+function buildSkillCatalogFacetOptions(values: Array<string | null | undefined>): SkillCatalogFilterOption[] {
+  const counts = new Map<string, number>();
+  values.forEach((value) => {
+    const id = value?.trim();
+    if (!id) return;
+    counts.set(id, (counts.get(id) ?? 0) + 1);
+  });
+
+  return Array.from(counts, ([id, count]) => ({
+    id,
+    label: labelSkillCatalogFacet(id),
+    count,
+  })).sort((left, right) => {
+    if (left.id === 'general') return -1;
+    if (right.id === 'general') return 1;
+    return left.label.localeCompare(right.label, undefined, { sensitivity: 'base' });
+  });
+}
+
+function labelSkillCatalogFacet(value: string): string {
+  return value
+    .split(/[-_\s]+/)
+    .filter(Boolean)
+    .map((part) => part.charAt(0).toUpperCase() + part.slice(1))
+    .join(' ');
+}
+
 function integrationTabLabel(id: IntegrationTab, t: ReturnType<typeof useT>): string {
   switch (id) {
     case 'mcp': return t('integrations.tabLabel.mcp');
@@ -205,7 +963,7 @@ function integrationTabHint(id: IntegrationTab, t: ReturnType<typeof useT>): str
   switch (id) {
     case 'mcp': return t('integrations.tabHint.mcp');
     case 'connectors': return t('integrations.tabHint.connectors');
-    case 'skills': return t('tasks.comingSoon');
+    case 'skills': return t('integrations.skillsTreeView');
     case 'use-everywhere': return t('integrations.tabHint.useEverywhere');
   }
 }
diff --git a/apps/web/src/i18n/locales/en.ts b/apps/web/src/i18n/locales/en.ts
index f2cd3cd78..024322076 100644
--- a/apps/web/src/i18n/locales/en.ts
+++ b/apps/web/src/i18n/locales/en.ts
@@ -684,8 +684,39 @@ export const en: Dict = {
   'integrations.tabHint.mcp': 'External tools',
   'integrations.tabHint.connectors': 'Accounts and APIs',
   'integrations.tabHint.useEverywhere': 'CLI, HTTP, MCP',
-  'integrations.skillsTitle': 'Skills integrations',
-  'integrations.skillsBody': 'Skill-level integration management is being carried over from another branch. This tab is reserved so MCP, Connectors, and future Skills setup live in the same Integration route.',
+  'integrations.skillsTitle': 'Skill tree',
+  'integrations.skillsBody': 'Browse the installed Open Design skills by mode and scenario. Select any node to inspect its platform, preview type, design-system requirement, and example prompt.',
+  'integrations.skillsViewMode': 'Skills catalog view',
+  'integrations.skillsTreeView': 'Skill tree',
+  'integrations.skillsListView': 'List view',
+  'integrations.skillsSearch': 'Search skills...',
+  'integrations.skillsFilters': 'Skill filters',
+  'integrations.skillsFilterMode': 'Mode',
+  'integrations.skillsFilterScenario': 'Scenario',
+  'integrations.skillsFilterCategory': 'Category',
+  'integrations.skillsFilterPlatform': 'Platform',
+  'integrations.skillsFilterPreview': 'Preview',
+  'integrations.skillsFilterDesignSystem': 'Design system',
+  'integrations.skillsFilterAll': 'All',
+  'integrations.skillsLoading': 'Loading skills...',
+  'integrations.skillsLoadFailed': 'Could not load skills. Make sure the local daemon is running, then try again.',
+  'integrations.skillsNoResults': 'No skills match your search.',
+  'integrations.skillsNoFilterResults': 'No skills match these filters.',
+  'integrations.skillsListEmpty': 'Select a skill row to inspect it.',
+  'integrations.skillsTreeEmpty': 'Select a skill node to inspect it.',
+  'integrations.skillsTreeGuideMode': 'MODE',
+  'integrations.skillsTreeGuideScenario': 'SCENE',
+  'integrations.skillsTreeGuideSkill': 'SKILL',
+  'integrations.skillsTreeLegendMode': 'Mode',
+  'integrations.skillsTreeLegendScenario': 'Scenario',
+  'integrations.skillsTreeLegendSkill': 'Skill',
+  'integrations.skillsTreePlatform': 'Platform',
+  'integrations.skillsTreePreviewType': 'Preview',
+  'integrations.skillsTreeDesignSystem': 'Design system',
+  'integrations.skillsTreeDesignSystemRequired': 'Required',
+  'integrations.skillsTreeDesignSystemOptional': 'Optional',
+  'integrations.skillsTreeSource': 'Source',
+  'integrations.skillsTreeExamplePrompt': 'Example prompt',
   'mcpClient.title': 'External MCP servers',
   'mcpClient.subtitle': 'Third-party tools for your coding agent.',
   'mcpClient.addServer': 'Add server',
diff --git a/apps/web/src/i18n/locales/zh-CN.ts b/apps/web/src/i18n/locales/zh-CN.ts
index 115f85b82..ad0d5c861 100644
--- a/apps/web/src/i18n/locales/zh-CN.ts
+++ b/apps/web/src/i18n/locales/zh-CN.ts
@@ -684,8 +684,39 @@ export const zhCN: Dict = {
   'integrations.tabHint.mcp': '外部工具',
   'integrations.tabHint.connectors': '账号和 API',
   'integrations.tabHint.useEverywhere': 'CLI、HTTP、MCP',
-  'integrations.skillsTitle': '技能集成',
-  'integrations.skillsBody': '技能级集成管理正在从另一个分支迁移过来。此标签页预留给 MCP、连接器和未来技能设置，使它们位于同一个集成路由中。',
+  'integrations.skillsTitle': '技能树',
+  'integrations.skillsBody': '按模式和场景浏览已安装的 Open Design 技能。选择任意节点即可查看平台、预览类型、设计系统要求和示例提示词。',
+  'integrations.skillsViewMode': '技能目录视图',
+  'integrations.skillsTreeView': '技能树',
+  'integrations.skillsListView': '列表视图',
+  'integrations.skillsSearch': '搜索技能...',
+  'integrations.skillsFilters': '技能筛选',
+  'integrations.skillsFilterMode': '模式',
+  'integrations.skillsFilterScenario': '场景',
+  'integrations.skillsFilterCategory': '分类',
+  'integrations.skillsFilterPlatform': '平台',
+  'integrations.skillsFilterPreview': '预览',
+  'integrations.skillsFilterDesignSystem': '设计系统',
+  'integrations.skillsFilterAll': '全部',
+  'integrations.skillsLoading': '正在加载技能...',
+  'integrations.skillsLoadFailed': '无法加载技能。请确认本地 daemon 正在运行，然后重试。',
+  'integrations.skillsNoResults': '没有匹配的技能。',
+  'integrations.skillsNoFilterResults': '没有匹配这些筛选条件的技能。',
+  'integrations.skillsListEmpty': '选择一个技能行查看详情。',
+  'integrations.skillsTreeEmpty': '选择一个技能节点查看详情。',
+  'integrations.skillsTreeGuideMode': '模式',
+  'integrations.skillsTreeGuideScenario': '场景',
+  'integrations.skillsTreeGuideSkill': '技能',
+  'integrations.skillsTreeLegendMode': '模式',
+  'integrations.skillsTreeLegendScenario': '场景',
+  'integrations.skillsTreeLegendSkill': '技能',
+  'integrations.skillsTreePlatform': '平台',
+  'integrations.skillsTreePreviewType': '预览',
+  'integrations.skillsTreeDesignSystem': '设计系统',
+  'integrations.skillsTreeDesignSystemRequired': '需要',
+  'integrations.skillsTreeDesignSystemOptional': '可选',
+  'integrations.skillsTreeSource': '来源',
+  'integrations.skillsTreeExamplePrompt': '示例提示词',
   'mcpClient.title': '外部 MCP 服务器',
   'mcpClient.subtitle': '供编码智能体使用的第三方工具。',
   'mcpClient.addServer': '添加服务器',
diff --git a/apps/web/src/i18n/locales/zh-TW.ts b/apps/web/src/i18n/locales/zh-TW.ts
index 644391e94..c7c7586c0 100644
--- a/apps/web/src/i18n/locales/zh-TW.ts
+++ b/apps/web/src/i18n/locales/zh-TW.ts
@@ -610,8 +610,39 @@ export const zhTW: Dict = {
   'integrations.tabHint.mcp': '外部工具',
   'integrations.tabHint.connectors': '帳號與 API',
   'integrations.tabHint.useEverywhere': 'CLI、HTTP、MCP',
-  'integrations.skillsTitle': '技能整合',
-  'integrations.skillsBody': '技能層級的整合管理正從另一個分支搬移過來。此分頁預留給 MCP、連接器與未來的技能設定，讓它們集中在同一個整合路由中。',
+  'integrations.skillsTitle': '技能樹',
+  'integrations.skillsBody': '依模式與場景瀏覽已安裝的 Open Design 技能。選取任一節點即可查看平台、預覽類型、設計系統需求與範例提示詞。',
+  'integrations.skillsViewMode': '技能目錄視圖',
+  'integrations.skillsTreeView': '技能樹',
+  'integrations.skillsListView': '列表視圖',
+  'integrations.skillsSearch': '搜尋技能...',
+  'integrations.skillsFilters': '技能篩選',
+  'integrations.skillsFilterMode': '模式',
+  'integrations.skillsFilterScenario': '場景',
+  'integrations.skillsFilterCategory': '分類',
+  'integrations.skillsFilterPlatform': '平台',
+  'integrations.skillsFilterPreview': '預覽',
+  'integrations.skillsFilterDesignSystem': '設計系統',
+  'integrations.skillsFilterAll': '全部',
+  'integrations.skillsLoading': '正在載入技能...',
+  'integrations.skillsLoadFailed': '無法載入技能。請確認本機 daemon 正在執行，然後再試一次。',
+  'integrations.skillsNoResults': '沒有符合的技能。',
+  'integrations.skillsNoFilterResults': '沒有符合這些篩選條件的技能。',
+  'integrations.skillsListEmpty': '選取一個技能列以查看詳細資訊。',
+  'integrations.skillsTreeEmpty': '選取一個技能節點以查看詳細資訊。',
+  'integrations.skillsTreeGuideMode': '模式',
+  'integrations.skillsTreeGuideScenario': '場景',
+  'integrations.skillsTreeGuideSkill': '技能',
+  'integrations.skillsTreeLegendMode': '模式',
+  'integrations.skillsTreeLegendScenario': '場景',
+  'integrations.skillsTreeLegendSkill': '技能',
+  'integrations.skillsTreePlatform': '平台',
+  'integrations.skillsTreePreviewType': '預覽',
+  'integrations.skillsTreeDesignSystem': '設計系統',
+  'integrations.skillsTreeDesignSystemRequired': '需要',
+  'integrations.skillsTreeDesignSystemOptional': '可選',
+  'integrations.skillsTreeSource': '來源',
+  'integrations.skillsTreeExamplePrompt': '範例提示詞',
   'mcpClient.title': '外部 MCP 伺服器',
   'mcpClient.subtitle': '提供給編碼智能體使用的第三方工具。',
   'mcpClient.addServer': '新增伺服器',
diff --git a/apps/web/src/i18n/types.ts b/apps/web/src/i18n/types.ts
index 967c33ef3..2e3867d8f 100644
--- a/apps/web/src/i18n/types.ts
+++ b/apps/web/src/i18n/types.ts
@@ -998,6 +998,37 @@ export interface Dict {
   'integrations.tabHint.useEverywhere': string;
   'integrations.skillsTitle': string;
   'integrations.skillsBody': string;
+  'integrations.skillsViewMode': string;
+  'integrations.skillsTreeView': string;
+  'integrations.skillsListView': string;
+  'integrations.skillsSearch': string;
+  'integrations.skillsFilters': string;
+  'integrations.skillsFilterMode': string;
+  'integrations.skillsFilterScenario': string;
+  'integrations.skillsFilterCategory': string;
+  'integrations.skillsFilterPlatform': string;
+  'integrations.skillsFilterPreview': string;
+  'integrations.skillsFilterDesignSystem': string;
+  'integrations.skillsFilterAll': string;
+  'integrations.skillsLoading': string;
+  'integrations.skillsLoadFailed': string;
+  'integrations.skillsNoResults': string;
+  'integrations.skillsNoFilterResults': string;
+  'integrations.skillsListEmpty': string;
+  'integrations.skillsTreeEmpty': string;
+  'integrations.skillsTreeGuideMode': string;
+  'integrations.skillsTreeGuideScenario': string;
+  'integrations.skillsTreeGuideSkill': string;
+  'integrations.skillsTreeLegendMode': string;
+  'integrations.skillsTreeLegendScenario': string;
+  'integrations.skillsTreeLegendSkill': string;
+  'integrations.skillsTreePlatform': string;
+  'integrations.skillsTreePreviewType': string;
+  'integrations.skillsTreeDesignSystem': string;
+  'integrations.skillsTreeDesignSystemRequired': string;
+  'integrations.skillsTreeDesignSystemOptional': string;
+  'integrations.skillsTreeSource': string;
+  'integrations.skillsTreeExamplePrompt': string;
   'mcpClient.title': string;
   'mcpClient.subtitle': string;
   'mcpClient.addServer': string;
diff --git a/apps/web/src/providers/registry.ts b/apps/web/src/providers/registry.ts
index cea06d135..d87d8dc49 100644
--- a/apps/web/src/providers/registry.ts
+++ b/apps/web/src/providers/registry.ts
@@ -13,6 +13,7 @@ import type {
   ImportLocalDesignSystemResponse,
   ReplaceProjectWorkingDirResponse,
 } from '@open-design/contracts';
+import { parseSkillSummaries } from '@open-design/contracts';
 import type {
   AgentInfo,
   AppVersionInfo,
@@ -100,13 +101,21 @@ export async function fetchAgents(options?: { throwOnError?: boolean }): Promise
   }
 }
 
-export async function fetchSkills(): Promise<SkillSummary[]> {
+export async function fetchSkills(options?: { throwOnError?: boolean }): Promise<SkillSummary[]> {
   try {
     const resp = await fetch('/api/skills');
-    if (!resp.ok) return [];
-    const json = (await resp.json()) as { skills: SkillSummary[] };
-    return json.skills ?? [];
-  } catch {
+    if (!resp.ok) {
+      if (options?.throwOnError) throw new Error(`skills ${resp.status}`);
+      return [];
+    }
+    const json = await resp.json() as { skills?: unknown };
+    if (!Array.isArray(json.skills)) {
+      if (options?.throwOnError) throw new Error('skills response malformed');
+      return [];
+    }
+    return parseSkillSummaries(json.skills);
+  } catch (err) {
+    if (options?.throwOnError) throw err;
     return [];
   }
 }
diff --git a/apps/web/src/styles/home/integrations.css b/apps/web/src/styles/home/integrations.css
index 1f1339fb4..d4eca80e0 100644
--- a/apps/web/src/styles/home/integrations.css
+++ b/apps/web/src/styles/home/integrations.css
@@ -186,6 +186,588 @@
   color: var(--text-muted);
 }
 
+.integrations-skills-tree {
+  display: flex;
+  flex-direction: column;
+  gap: 14px;
+  padding: 18px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background: var(--bg-panel);
+  box-shadow: var(--shadow-xs);
+}
+
+.integrations-skills-tree__head {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 18px;
+}
+
+.integrations-skills-tree__head h2 {
+  margin: 0;
+  font-size: 18px;
+  color: var(--text-strong);
+}
+
+.integrations-skills-tree__tools {
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: flex-end;
+  gap: 8px;
+  min-width: min(480px, 100%);
+}
+
+.integrations-skills-tree__view-toggle {
+  display: inline-flex;
+  align-items: center;
+  min-height: 36px;
+  padding: 3px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background: var(--bg);
+}
+
+.integrations-skills-tree__view-toggle button {
+  appearance: none;
+  min-height: 28px;
+  padding: 0 10px;
+  border: 0;
+  border-radius: calc(var(--radius-sm) - 3px);
+  background: transparent;
+  color: var(--text-muted);
+  font: inherit;
+  font-size: 12px;
+  font-weight: 650;
+  cursor: pointer;
+}
+
+.integrations-skills-tree__view-toggle button:hover {
+  color: var(--text);
+}
+
+.integrations-skills-tree__view-toggle button.is-active {
+  background: var(--accent-tint);
+  color: var(--accent-strong, var(--accent));
+}
+
+.integrations-skills-tree__search {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  width: min(300px, 100%);
+  min-height: 36px;
+  padding: 0 11px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background: var(--bg);
+  color: var(--text-muted);
+}
+
+.integrations-skills-tree__search input {
+  flex: 1;
+  min-width: 0;
+  border: 0;
+  outline: 0;
+  background: transparent;
+  color: var(--text);
+  font: inherit;
+}
+
+.integrations-skills-tree__filters {
+  display: grid;
+  grid-template-columns: repeat(6, minmax(120px, 1fr));
+  gap: 8px;
+  align-items: end;
+}
+
+.integrations-skills-tree__filter {
+  display: grid;
+  gap: 5px;
+  min-width: 0;
+}
+
+.integrations-skills-tree__filter span {
+  color: var(--text-muted);
+  font-size: 11px;
+  font-weight: 650;
+}
+
+.integrations-skills-tree__filter select {
+  width: 100%;
+  min-height: 34px;
+  min-width: 0;
+  padding: 0 9px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background: var(--bg);
+  color: var(--text);
+  font: inherit;
+  font-size: 12px;
+}
+
+.integrations-skills-tree__summary {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  padding-bottom: 10px;
+  border-bottom: 1px solid var(--border);
+}
+
+.integrations-skills-tree__summary p {
+  margin: 0;
+  max-width: 760px;
+  font-size: 13px;
+  line-height: 1.55;
+  color: var(--text-muted);
+}
+
+.integrations-skills-tree__summary span {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 32px;
+  height: 26px;
+  padding: 0 9px;
+  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border));
+  border-radius: 999px;
+  color: var(--accent-strong, var(--accent));
+  font-size: 12px;
+  font-weight: 700;
+}
+
+.integrations-skills-tree__empty {
+  padding: 24px;
+  border: 1px dashed var(--border);
+  border-radius: var(--radius-sm);
+  color: var(--text-muted);
+  text-align: center;
+}
+
+.integrations-skills-tree__grid {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
+  gap: 14px;
+  align-items: start;
+}
+
+.integrations-skills-tree__canvas {
+  overflow: auto;
+  min-height: 640px;
+  min-width: 0;
+  position: relative;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background:
+    linear-gradient(180deg, color-mix(in srgb, var(--bg-panel) 78%, transparent), transparent 42%),
+    var(--bg);
+}
+
+.integrations-skills-tree__list {
+  display: grid;
+  gap: 8px;
+  overflow: auto;
+  max-height: 640px;
+  min-height: 420px;
+  min-width: 0;
+  padding: 10px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background: var(--bg);
+}
+
+.integrations-skills-tree__list-row {
+  appearance: none;
+  display: grid;
+  gap: 6px;
+  width: 100%;
+  min-width: 0;
+  padding: 12px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background: var(--bg-panel);
+  color: var(--text);
+  cursor: pointer;
+  text-align: left;
+  transition: border-color 120ms ease, background-color 120ms ease, transform 120ms ease;
+}
+
+.integrations-skills-tree__list-row:hover,
+.integrations-skills-tree__list-row:focus-visible {
+  border-color: color-mix(in srgb, var(--accent) 34%, var(--border));
+  background: color-mix(in srgb, var(--accent-tint) 24%, var(--bg-panel));
+  outline: none;
+}
+
+.integrations-skills-tree__list-row.is-active {
+  border-color: color-mix(in srgb, var(--accent) 56%, var(--border));
+  background: color-mix(in srgb, var(--accent-tint) 42%, var(--bg-panel));
+}
+
+.integrations-skills-tree__list-title {
+  overflow: hidden;
+  color: var(--text-strong);
+  font-size: 13px;
+  font-weight: 760;
+  line-height: 1.35;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.integrations-skills-tree__list-description {
+  display: -webkit-box;
+  overflow: hidden;
+  color: var(--text-muted);
+  font-size: 12px;
+  line-height: 1.45;
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 2;
+}
+
+.integrations-skills-tree__list-meta {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 5px;
+}
+
+.integrations-skills-tree__list-meta span {
+  display: inline-flex;
+  align-items: center;
+  max-width: 100%;
+  min-height: 22px;
+  padding: 0 7px;
+  border: 1px solid var(--border);
+  border-radius: 999px;
+  color: var(--text-muted);
+  font-size: 11px;
+  line-height: 1;
+}
+
+.integrations-skills-tree__svg {
+  display: block;
+  width: 100%;
+}
+
+.integrations-skills-tree__guide line {
+  stroke: color-mix(in srgb, var(--border) 78%, transparent);
+  stroke-dasharray: 3 8;
+  stroke-width: 1;
+}
+
+.integrations-skills-tree__guide text {
+  fill: color-mix(in srgb, var(--text-muted) 42%, transparent);
+  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+  font-size: 10px;
+  font-weight: 700;
+  letter-spacing: 0;
+  writing-mode: vertical-rl;
+}
+
+.integrations-skills-tree__edge path {
+  fill: none;
+  pointer-events: none;
+  stroke-linecap: round;
+  stroke-linejoin: round;
+}
+
+.integrations-skills-tree__edge-base {
+  opacity: 0.72;
+  stroke: color-mix(in srgb, var(--text-muted) 34%, var(--border));
+  stroke-width: 2.1;
+}
+
+.integrations-skills-tree__edge-aura {
+  opacity: 0;
+  stroke: color-mix(in srgb, var(--accent) 28%, transparent);
+  stroke-width: 7;
+}
+
+.integrations-skills-tree__edge.is-active .integrations-skills-tree__edge-aura {
+  opacity: 0.28;
+}
+
+.integrations-skills-tree__edge.is-active .integrations-skills-tree__edge-base {
+  opacity: 1;
+  stroke: var(--accent);
+  stroke-width: 2.8;
+}
+
+.integrations-skills-tree__svg-node {
+  cursor: default;
+  outline: none;
+}
+
+.integrations-skills-tree__svg-node[role="button"] {
+  cursor: pointer;
+}
+
+.integrations-skills-tree__svg-node.is-branch {
+  opacity: 0.86;
+}
+
+.integrations-skills-tree__svg-core {
+  fill: color-mix(in srgb, var(--bg-panel) 86%, black);
+  stroke: color-mix(in srgb, var(--accent) 34%, var(--border));
+  stroke-width: 1.4;
+  transition: fill 160ms ease, stroke 160ms ease, stroke-width 160ms ease;
+}
+
+.integrations-skills-tree__svg-node.is-mode .integrations-skills-tree__svg-core {
+  fill: color-mix(in srgb, var(--bg-panel) 82%, var(--border));
+  stroke: color-mix(in srgb, var(--text-muted) 30%, var(--border));
+}
+
+.integrations-skills-tree__svg-node.is-scenario .integrations-skills-tree__svg-core {
+  fill: color-mix(in srgb, var(--bg-panel) 76%, var(--border));
+  stroke: color-mix(in srgb, var(--text-muted) 28%, var(--border));
+}
+
+.integrations-skills-tree__svg-node.is-interactive.is-active .integrations-skills-tree__svg-core,
+.integrations-skills-tree__svg-node.is-interactive[role="button"]:hover .integrations-skills-tree__svg-core,
+.integrations-skills-tree__svg-node.is-interactive[role="button"]:focus-visible .integrations-skills-tree__svg-core {
+  fill: color-mix(in srgb, var(--accent-tint) 68%, var(--bg));
+  stroke: var(--accent);
+  stroke-width: 2.3;
+}
+
+.integrations-skills-tree__svg-node.is-branch.is-on-path .integrations-skills-tree__svg-core {
+  stroke: color-mix(in srgb, var(--accent) 42%, var(--border));
+  stroke-width: 1.7;
+}
+
+.integrations-skills-tree__svg-node.is-branch .integrations-skills-tree__svg-label {
+  fill: color-mix(in srgb, var(--text-strong) 86%, var(--text-muted));
+}
+
+.integrations-skills-tree__svg-ring,
+.integrations-skills-tree__svg-branch-ring,
+.integrations-skills-tree__svg-affordance,
+.integrations-skills-tree__svg-pulse {
+  fill: none;
+  stroke: color-mix(in srgb, var(--accent) 22%, transparent);
+  stroke-width: 1;
+}
+
+.integrations-skills-tree__svg-affordance {
+  opacity: 0.62;
+  stroke: color-mix(in srgb, var(--accent) 28%, transparent);
+  stroke-width: 1.4;
+}
+
+.integrations-skills-tree__svg-node.is-interactive[role="button"]:hover .integrations-skills-tree__svg-affordance,
+.integrations-skills-tree__svg-node.is-interactive[role="button"]:focus-visible .integrations-skills-tree__svg-affordance,
+.integrations-skills-tree__svg-node.is-interactive.is-active .integrations-skills-tree__svg-affordance {
+  opacity: 1;
+  stroke: color-mix(in srgb, var(--accent) 62%, transparent);
+  stroke-width: 2;
+}
+
+.integrations-skills-tree__svg-branch-ring {
+  stroke: color-mix(in srgb, var(--text-muted) 22%, transparent);
+  stroke-dasharray: 2 5;
+}
+
+.integrations-skills-tree__svg-pulse {
+  opacity: 0.42;
+}
+
+.integrations-skills-tree__svg-pulse {
+  animation: integrations-skill-pulse 2.8s ease-in-out infinite;
+}
+
+.integrations-skills-tree__svg-glow {
+  opacity: 0.36;
+  fill: color-mix(in srgb, var(--accent) 42%, transparent);
+  filter: url("#integrations-skill-node-glow");
+  animation: integrations-skill-glow 2s ease-in-out infinite;
+}
+
+.integrations-skills-tree__svg-label,
+.integrations-skills-tree__svg-sub {
+  text-anchor: middle;
+  dominant-baseline: middle;
+  pointer-events: none;
+}
+
+.integrations-skills-tree__svg-label {
+  fill: var(--text-strong);
+  font-size: 10px;
+  font-weight: 760;
+}
+
+.integrations-skills-tree__svg-node.is-mode .integrations-skills-tree__svg-label {
+  font-size: 12px;
+  font-weight: 820;
+}
+
+.integrations-skills-tree__svg-node.is-scenario .integrations-skills-tree__svg-label {
+  font-size: 10.5px;
+  font-weight: 720;
+}
+
+.integrations-skills-tree__svg-node.is-skill .integrations-skills-tree__svg-label {
+  font-size: 10px;
+  font-weight: 760;
+}
+
+.integrations-skills-tree__svg-sub {
+  fill: var(--text-muted);
+  font-size: 9.5px;
+}
+
+.integrations-skills-tree__svg-node.is-mode .integrations-skills-tree__svg-sub {
+  font-size: 10px;
+  font-weight: 680;
+}
+
+.integrations-skills-tree__svg-node.is-scenario .integrations-skills-tree__svg-sub,
+.integrations-skills-tree__svg-node.is-skill .integrations-skills-tree__svg-sub {
+  font-size: 9px;
+}
+
+.integrations-skills-tree__legend {
+  position: sticky;
+  bottom: 0;
+  display: flex;
+  flex-wrap: wrap;
+  gap: 18px;
+  padding: 10px 14px;
+  border-top: 1px solid var(--border);
+  background: color-mix(in srgb, var(--bg) 92%, transparent);
+  color: var(--text-muted);
+  font-size: 11px;
+  font-weight: 650;
+}
+
+.integrations-skills-tree__legend span {
+  display: inline-flex;
+  align-items: center;
+  gap: 7px;
+}
+
+.integrations-skills-tree__legend i {
+  width: 10px;
+  height: 10px;
+  border: 1px solid var(--accent);
+  border-radius: 999px;
+  background: color-mix(in srgb, var(--accent) 16%, transparent);
+}
+
+.integrations-skills-tree__legend .is-mode {
+  width: 13px;
+  height: 13px;
+}
+
+.integrations-skills-tree__legend .is-scenario {
+  width: 11px;
+  height: 11px;
+}
+
+@keyframes integrations-skill-pulse {
+  0%, 100% {
+    opacity: 0.42;
+    transform: scale(0.92);
+  }
+  50% {
+    opacity: 0;
+    transform: scale(1.2);
+  }
+}
+
+@keyframes integrations-skill-glow {
+  0%, 100% {
+    opacity: 0.34;
+    transform: scale(0.94);
+  }
+  50% {
+    opacity: 0.12;
+    transform: scale(1.1);
+  }
+}
+
+.integrations-skills-tree__detail {
+  position: sticky;
+  top: 12px;
+  min-width: 0;
+  padding: 16px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background: var(--bg);
+}
+
+.integrations-skills-tree__detail.is-empty {
+  color: var(--text-muted);
+}
+
+.integrations-skills-tree__detail-kicker {
+  margin: 0 0 6px;
+  color: var(--accent-strong, var(--accent));
+  font-size: 11px;
+  font-weight: 700;
+  text-transform: uppercase;
+}
+
+.integrations-skills-tree__detail h3 {
+  margin: 0;
+  font-size: 17px;
+  color: var(--text-strong);
+}
+
+.integrations-skills-tree__detail > p:not(.integrations-skills-tree__detail-kicker) {
+  margin: 8px 0 0;
+  color: var(--text-muted);
+  font-size: 13px;
+  line-height: 1.55;
+}
+
+.integrations-skills-tree__detail dl {
+  display: grid;
+  gap: 8px;
+  margin: 14px 0 0;
+}
+
+.integrations-skills-tree__detail dl div {
+  display: flex;
+  justify-content: space-between;
+  gap: 12px;
+  padding-bottom: 8px;
+  border-bottom: 1px solid var(--border);
+}
+
+.integrations-skills-tree__detail dt {
+  color: var(--text-muted);
+  font-size: 11px;
+}
+
+.integrations-skills-tree__detail dd {
+  margin: 0;
+  color: var(--text);
+  font-size: 11px;
+  text-align: right;
+}
+
+.integrations-skills-tree__prompt {
+  margin-top: 14px;
+  padding: 12px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  background: var(--bg-panel);
+}
+
+.integrations-skills-tree__prompt span {
+  color: var(--text-muted);
+  font-size: 11px;
+  font-weight: 700;
+}
+
+.integrations-skills-tree__prompt p {
+  margin: 6px 0 0;
+  color: var(--text);
+  font-size: 12px;
+  line-height: 1.5;
+}
+
 @media (max-width: 760px) {
   .integrations-view__hero {
     flex-direction: column;
@@ -198,4 +780,42 @@
   .integrations-view__coming-soon {
     grid-template-columns: 1fr;
   }
+
+  .integrations-skills-tree__head,
+  .integrations-skills-tree__summary {
+    align-items: stretch;
+    flex-direction: column;
+  }
+
+  .integrations-skills-tree__tools {
+    justify-content: stretch;
+    min-width: 0;
+  }
+
+  .integrations-skills-tree__view-toggle,
+  .integrations-skills-tree__search {
+    width: 100%;
+  }
+
+  .integrations-skills-tree__view-toggle button {
+    flex: 1;
+  }
+
+  .integrations-skills-tree__filters {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+
+  .integrations-skills-tree__grid {
+    grid-template-columns: 1fr;
+  }
+
+  .integrations-skills-tree__detail {
+    position: static;
+  }
+}
+
+@media (max-width: 520px) {
+  .integrations-skills-tree__filters {
+    grid-template-columns: 1fr;
+  }
 }
diff --git a/apps/web/tests/components/IntegrationsView.skills.test.tsx b/apps/web/tests/components/IntegrationsView.skills.test.tsx
new file mode 100644
index 000000000..cac45720f
--- /dev/null
+++ b/apps/web/tests/components/IntegrationsView.skills.test.tsx
@@ -0,0 +1,287 @@
+// @vitest-environment jsdom
+
+import { cleanup, fireEvent, render, screen, waitFor, within } from '@testing-library/react';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { IntegrationsView } from '../../src/components/IntegrationsView';
+import { I18nProvider, type Locale } from '../../src/i18n';
+import type { AppConfig, SkillSummary } from '../../src/types';
+
+const originalFetch = globalThis.fetch;
+
+const TEST_CONFIG: AppConfig = {
+  mode: 'daemon',
+  apiKey: '',
+  baseUrl: '',
+  model: '',
+  agentId: null,
+  skillId: null,
+  designSystemId: null,
+};
+
+function skill(overrides: Partial<SkillSummary>): SkillSummary {
+  return {
+    id: 'skill',
+    name: 'Skill',
+    description: 'A reusable skill.',
+    triggers: [],
+    mode: 'prototype',
+    previewType: 'html',
+    designSystemRequired: true,
+    defaultFor: [],
+    upstream: null,
+    hasBody: true,
+    examplePrompt: '',
+    aggregatesExamples: false,
+    source: 'built-in',
+    ...overrides,
+  };
+}
+
+function renderSkillsIntegration(
+  skills: SkillSummary[],
+  options: { skillsStatus?: number; skillsBody?: unknown; locale?: Locale } = {},
+) {
+  globalThis.fetch = vi.fn(async (input: RequestInfo | URL) => {
+    const url = input.toString();
+    if (url === '/api/skills') {
+      return new Response(JSON.stringify(options.skillsBody ?? { skills }), {
+        status: options.skillsStatus ?? 200,
+        headers: { 'content-type': 'application/json' },
+      });
+    }
+    return new Response(JSON.stringify({}), { status: 404 });
+  }) as typeof fetch;
+
+  render(
+    <I18nProvider initial={options.locale ?? 'en'}>
+      <IntegrationsView
+        config={TEST_CONFIG}
+        initialTab="skills"
+        onPersistComposioKey={() => undefined}
+      />
+    </I18nProvider>,
+  );
+}
+
+describe('IntegrationsView skills tree', () => {
+  afterEach(() => {
+    cleanup();
+    globalThis.fetch = originalFetch;
+    vi.restoreAllMocks();
+  });
+
+  it('renders skills as a read-only list view by default and shows row metadata', async () => {
+    renderSkillsIntegration([
+      skill({
+        id: 'dashboard',
+        name: 'Dashboard',
+        description: 'Dense operations UI.',
+        scenario: 'operation',
+        platform: 'desktop',
+        previewType: 'html',
+        examplePrompt: 'Build an operations dashboard.',
+      }),
+      skill({
+        id: 'pitch-deck',
+        name: 'Pitch Deck',
+        mode: 'deck',
+        scenario: 'product',
+        previewType: 'pptx',
+        designSystemRequired: false,
+      }),
+    ]);
+
+    expect(await screen.findByTestId('integrations-skill-list-row-dashboard')).toBeTruthy();
+    expect(screen.getByTestId('integrations-skill-list-row-pitch-deck')).toBeTruthy();
+    expect(screen.getByRole('button', { name: 'List view' }).getAttribute('class')).toContain('is-active');
+    expect(screen.queryByTestId('integrations-skill-node-dashboard')).toBeNull();
+    expect(screen.queryByTestId('integrations-skill-detail')).toBeNull();
+    expect(screen.getByText('Select a skill row to inspect it.')).toBeTruthy();
+    expect(screen.queryByText('Select a skill node to inspect it.')).toBeNull();
+
+    fireEvent.click(screen.getByTestId('integrations-skill-list-row-pitch-deck'));
+
+    const detail = await screen.findByTestId('integrations-skill-detail');
+    expect(within(detail).getByText('Pitch Deck')).toBeTruthy();
+    expect(within(detail).getByText('pptx')).toBeTruthy();
+    expect(within(detail).getByText('Optional')).toBeTruthy();
+  });
+
+  it('switches to the mode/scenario tree view and reuses the detail panel', async () => {
+    renderSkillsIntegration([
+      skill({
+        id: 'dashboard',
+        name: 'Dashboard',
+        description: 'Dense operations UI.',
+        scenario: 'operation',
+        category: 'operations',
+        platform: 'desktop',
+      }),
+      skill({
+        id: 'pitch-deck',
+        name: 'Pitch Deck',
+        mode: 'deck',
+        scenario: 'product',
+        category: 'sales',
+        previewType: 'pptx',
+        designSystemRequired: false,
+      }),
+    ]);
+
+    await screen.findByTestId('integrations-skill-list-row-dashboard');
+
+    fireEvent.click(screen.getByRole('button', { name: 'Skill tree' }));
+
+    expect(screen.getByText('Prototype')).toBeTruthy();
+    expect(screen.getByText('Operation')).toBeTruthy();
+    expect(screen.getByText('Deck')).toBeTruthy();
+    expect(screen.queryByTestId('integrations-skill-list-row-dashboard')).toBeNull();
+    expect(screen.getByText('Select a skill node to inspect it.')).toBeTruthy();
+    expect(screen.getByText('Operation').closest('g')?.getAttribute('class')).toContain('is-branch');
+    expect(screen.getByText('Operation').closest('g')?.getAttribute('role')).toBeNull();
+    expect(screen.getByTestId('integrations-skill-node-pitch-deck').getAttribute('class')).toContain('is-interactive');
+
+    fireEvent.click(screen.getByTestId('integrations-skill-node-pitch-deck'));
+
+    const detail = await screen.findByTestId('integrations-skill-detail');
+    expect(within(detail).getByText('Pitch Deck')).toBeTruthy();
+    expect(within(detail).getByText('pptx')).toBeTruthy();
+  });
+
+  it('applies catalog facet filters to the same result set', async () => {
+    renderSkillsIntegration([
+      skill({
+        id: 'dashboard',
+        name: 'Dashboard',
+        scenario: 'operation',
+        category: 'operations',
+        platform: 'desktop',
+      }),
+      skill({
+        id: 'poster',
+        name: 'Poster',
+        scenario: 'marketing',
+        category: 'marketing',
+        platform: 'mobile',
+        designSystemRequired: false,
+      }),
+      skill({
+        id: 'pitch-deck',
+        name: 'Pitch Deck',
+        mode: 'deck',
+        scenario: 'product',
+        category: 'sales',
+        platform: 'desktop',
+        previewType: 'pptx',
+      }),
+    ]);
+
+    await screen.findByTestId('integrations-skill-list-row-dashboard');
+
+    fireEvent.change(screen.getByLabelText('Mode'), { target: { value: 'prototype' } });
+    fireEvent.change(screen.getByLabelText('Scenario'), { target: { value: 'operation' } });
+    fireEvent.change(screen.getByLabelText('Category'), { target: { value: 'operations' } });
+    fireEvent.change(screen.getByLabelText('Platform'), { target: { value: 'desktop' } });
+    fireEvent.change(screen.getByLabelText('Design system'), { target: { value: 'required' } });
+
+    await waitFor(() => {
+      expect(screen.getByTestId('integrations-skill-list-row-dashboard')).toBeTruthy();
+      expect(screen.queryByTestId('integrations-skill-list-row-poster')).toBeNull();
+      expect(screen.queryByTestId('integrations-skill-list-row-pitch-deck')).toBeNull();
+    });
+  });
+
+  it('clears stale selected detail when search and filters hide the selected skill', async () => {
+    renderSkillsIntegration([
+      skill({ id: 'dashboard', name: 'Dashboard', scenario: 'operation', platform: 'desktop' }),
+      skill({ id: 'poster', name: 'Poster', scenario: 'marketing', platform: 'mobile' }),
+    ]);
+
+    await screen.findByTestId('integrations-skill-list-row-dashboard');
+    fireEvent.click(screen.getByRole('button', { name: 'Skill tree' }));
+
+    await screen.findByTestId('integrations-skill-node-dashboard');
+    fireEvent.click(screen.getByTestId('integrations-skill-node-dashboard'));
+    expect(screen.getByTestId('integrations-skill-detail').textContent).toContain('Dashboard');
+
+    fireEvent.change(screen.getByLabelText('Platform'), {
+      target: { value: 'mobile' },
+    });
+    fireEvent.change(screen.getByPlaceholderText('Search skills...'), {
+      target: { value: 'poster' },
+    });
+
+    await waitFor(() => {
+      expect(screen.queryByTestId('integrations-skill-node-dashboard')).toBeNull();
+    });
+    expect(screen.getByTestId('integrations-skill-node-poster')).toBeTruthy();
+    expect(screen.queryByTestId('integrations-skill-detail')).toBeNull();
+    expect(screen.getByText('Select a skill node to inspect it.')).toBeTruthy();
+
+    fireEvent.click(screen.getByTestId('integrations-skill-node-poster'));
+    expect(screen.getByTestId('integrations-skill-detail').textContent).toContain('Poster');
+  });
+
+  it('shows an empty state when search and filters remove every skill', async () => {
+    renderSkillsIntegration([
+      skill({ id: 'dashboard', name: 'Dashboard', scenario: 'operation', platform: 'desktop' }),
+      skill({ id: 'poster', name: 'Poster', scenario: 'marketing', platform: 'mobile' }),
+    ]);
+
+    await screen.findByTestId('integrations-skill-list-row-dashboard');
+
+    fireEvent.change(screen.getByLabelText('Platform'), {
+      target: { value: 'desktop' },
+    });
+    fireEvent.change(screen.getByPlaceholderText('Search skills...'), {
+      target: { value: 'poster' },
+    });
+
+    expect(await screen.findByText('No skills match these filters.')).toBeTruthy();
+    expect(screen.queryByTestId('integrations-skill-detail')).toBeNull();
+  });
+
+  it('shows a load failure instead of an empty filter state when skills fail to load', async () => {
+    renderSkillsIntegration([], {
+      skillsStatus: 500,
+      skillsBody: { error: { message: 'boom' } },
+    });
+
+    expect(await screen.findByText('Could not load skills. Make sure the local daemon is running, then try again.')).toBeTruthy();
+    expect(screen.queryByText('No skills match these filters.')).toBeNull();
+  });
+
+  it('shows a load failure when skills payload contains malformed entries', async () => {
+    renderSkillsIntegration([], {
+      skillsBody: {
+        skills: [
+          skill({ id: 'dashboard', name: 'Dashboard' }),
+          { id: 'broken', mode: 'prototype' },
+        ],
+      },
+    });
+
+    expect(await screen.findByText('Could not load skills. Make sure the local daemon is running, then try again.')).toBeTruthy();
+    expect(screen.queryByText('No skills match these filters.')).toBeNull();
+    expect(screen.queryByTestId('integrations-skill-list-row-dashboard')).toBeNull();
+  });
+
+  it('localizes tree guide and legend labels', async () => {
+    renderSkillsIntegration([
+      skill({ id: 'dashboard', name: 'Dashboard', scenario: 'operation', platform: 'desktop' }),
+    ], { locale: 'zh-CN' });
+
+    await screen.findByTestId('integrations-skill-list-row-dashboard');
+    fireEvent.click(screen.getByRole('button', { name: '技能树' }));
+
+    await screen.findByTestId('integrations-skill-node-dashboard');
+
+    expect(screen.getAllByText('模式').length).toBeGreaterThan(0);
+    expect(screen.getAllByText('场景').length).toBeGreaterThan(0);
+    expect(screen.getAllByText('技能').length).toBeGreaterThan(0);
+    expect(screen.queryByText('Mode')).toBeNull();
+    expect(screen.queryByText('Scenario')).toBeNull();
+    expect(screen.queryByText('Skill')).toBeNull();
+  });
+});
diff --git a/packages/contracts/src/api/registry.ts b/packages/contracts/src/api/registry.ts
index 66f740515..071d61400 100644
--- a/packages/contracts/src/api/registry.ts
+++ b/packages/contracts/src/api/registry.ts
@@ -1,3 +1,5 @@
+import { z } from 'zod';
+
 export interface AgentModelOption {
   id: string;
   label: string;
@@ -148,6 +150,205 @@ export interface SkillsResponse {
   skills: SkillSummary[];
 }
 
+export const SkillSummarySchema: z.ZodType<SkillSummary> = z.object({
+  id: z.string(),
+  name: z.string(),
+  displayName: z.record(z.string()).optional(),
+  description: z.string(),
+  descriptionI18n: z.record(z.string()).optional(),
+  triggers: z.array(z.string()),
+  mode: z.enum([
+    'prototype',
+    'deck',
+    'template',
+    'design-system',
+    'image',
+    'video',
+    'audio',
+  ]),
+  surface: z.enum(['web', 'image', 'video', 'audio']).optional(),
+  platform: z.enum(['desktop', 'mobile']).nullable().optional(),
+  scenario: z.string().nullable().optional(),
+  category: z.string().nullable().optional(),
+  source: z.enum(['built-in', 'user']).optional(),
+  previewType: z.string(),
+  designSystemRequired: z.boolean(),
+  defaultFor: z.array(z.string()),
+  upstream: z.string().nullable(),
+  featured: z.number().nullable().optional(),
+  fidelity: z.enum(['wireframe', 'high-fidelity']).nullable().optional(),
+  speakerNotes: z.boolean().nullable().optional(),
+  animations: z.boolean().nullable().optional(),
+  craftRequires: z.array(z.string()).optional(),
+  hasBody: z.boolean(),
+  examplePrompt: z.string(),
+  examplePromptI18n: z.record(z.string()).optional(),
+  aggregatesExamples: z.boolean(),
+}).passthrough() as z.ZodType<SkillSummary>;
+
+export const SkillSummaryArraySchema = z.array(SkillSummarySchema);
+
+export function parseSkillSummaries(value: unknown): SkillSummary[] {
+  return SkillSummaryArraySchema.parse(value);
+}
+
+export function isSkillSummaries(value: unknown): value is SkillSummary[] {
+  return SkillSummaryArraySchema.safeParse(value).success;
+}
+
+export interface SkillCatalogTreeSkill {
+  id: string;
+  name: string;
+  description: string;
+  mode: SkillSummary['mode'];
+  scenario: string;
+  platform: SkillSummary['platform'];
+  previewType: string;
+  designSystemRequired: boolean;
+  examplePrompt: string;
+  source: SkillSummary['source'];
+  featured: number | null;
+  defaultFor: string[];
+  category: string | null;
+  skill: SkillSummary;
+}
+
+export interface SkillCatalogTreeScenario {
+  id: string;
+  label: string;
+  count: number;
+  skills: SkillCatalogTreeSkill[];
+}
+
+export interface SkillCatalogTreeMode {
+  id: SkillSummary['mode'];
+  label: string;
+  count: number;
+  scenarios: SkillCatalogTreeScenario[];
+}
+
+export interface SkillCatalogTree {
+  total: number;
+  modes: SkillCatalogTreeMode[];
+}
+
+const SKILL_MODE_ORDER: readonly SkillSummary['mode'][] = [
+  'prototype',
+  'deck',
+  'template',
+  'design-system',
+  'image',
+  'video',
+  'audio',
+];
+
+export function buildSkillCatalogTree(
+  skills: readonly SkillSummary[],
+): SkillCatalogTree {
+  const modeBuckets = new Map<SkillSummary['mode'], Map<string, SkillCatalogTreeSkill[]>>();
+
+  for (const skill of skills) {
+    const scenario = normalizeTreeScenario(skill.scenario);
+    let scenarioBuckets = modeBuckets.get(skill.mode);
+    if (!scenarioBuckets) {
+      scenarioBuckets = new Map<string, SkillCatalogTreeSkill[]>();
+      modeBuckets.set(skill.mode, scenarioBuckets);
+    }
+    const bucket = scenarioBuckets.get(scenario) ?? [];
+    bucket.push({
+      id: skill.id,
+      name: skill.name,
+      description: skill.description,
+      mode: skill.mode,
+      scenario,
+      platform: skill.platform ?? null,
+      previewType: skill.previewType,
+      designSystemRequired: skill.designSystemRequired,
+      examplePrompt: skill.examplePrompt,
+      source: skill.source,
+      featured: skill.featured ?? null,
+      defaultFor: skill.defaultFor ?? [],
+      category: skill.category ?? null,
+      skill,
+    });
+    scenarioBuckets.set(scenario, bucket);
+  }
+
+  const modes = [...modeBuckets.entries()]
+    .sort(([a], [b]) => compareMode(a, b))
+    .map(([mode, scenarioBuckets]) => {
+      const scenarios = [...scenarioBuckets.entries()]
+        .sort(([a], [b]) => compareScenario(a, b))
+        .map(([scenario, scenarioSkills]) => {
+          const sortedSkills = [...scenarioSkills].sort(compareTreeSkill);
+          return {
+            id: scenario,
+            label: labelFromSlug(scenario),
+            count: sortedSkills.length,
+            skills: sortedSkills,
+          };
+        });
+      return {
+        id: mode,
+        label: labelFromSlug(mode),
+        count: scenarios.reduce((total, scenario) => total + scenario.count, 0),
+        scenarios,
+      };
+    });
+
+  return {
+    total: skills.length,
+    modes,
+  };
+}
+
+function normalizeTreeScenario(scenario: SkillSummary['scenario']): string {
+  const normalized = typeof scenario === 'string' ? scenario.trim() : '';
+  return normalized.length > 0 ? normalized : 'general';
+}
+
+function compareMode(a: SkillSummary['mode'], b: SkillSummary['mode']): number {
+  const aIndex = SKILL_MODE_ORDER.indexOf(a);
+  const bIndex = SKILL_MODE_ORDER.indexOf(b);
+  if (aIndex !== bIndex) return aIndex - bIndex;
+  return a.localeCompare(b);
+}
+
+function compareScenario(a: string, b: string): number {
+  if (a === 'general' && b !== 'general') return -1;
+  if (b === 'general' && a !== 'general') return 1;
+  return a.localeCompare(b);
+}
+
+function compareTreeSkill(
+  a: SkillCatalogTreeSkill,
+  b: SkillCatalogTreeSkill,
+): number {
+  const rankDiff = treeSkillRank(a) - treeSkillRank(b);
+  if (rankDiff !== 0) return rankDiff;
+  if (a.featured !== null || b.featured !== null) {
+    const featuredDiff = (a.featured ?? Number.MAX_SAFE_INTEGER) - (b.featured ?? Number.MAX_SAFE_INTEGER);
+    if (featuredDiff !== 0) return featuredDiff;
+  }
+  const nameDiff = a.name.localeCompare(b.name);
+  if (nameDiff !== 0) return nameDiff;
+  return a.id.localeCompare(b.id);
+}
+
+function treeSkillRank(skill: SkillCatalogTreeSkill): number {
+  if (skill.defaultFor.length > 0) return 0;
+  if (skill.featured !== null) return 1;
+  return 2;
+}
+
+function labelFromSlug(slug: string): string {
+  return slug
+    .split('-')
+    .filter(Boolean)
+    .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
+    .join(' ');
+}
+
 export interface SkillResponse {
   skill: SkillDetail;
 }
diff --git a/packages/contracts/tests/skill-catalog-tree.test.ts b/packages/contracts/tests/skill-catalog-tree.test.ts
new file mode 100644
index 000000000..71619e518
--- /dev/null
+++ b/packages/contracts/tests/skill-catalog-tree.test.ts
@@ -0,0 +1,132 @@
+import { describe, expect, it } from 'vitest';
+import {
+  buildSkillCatalogTree,
+  parseSkillSummaries,
+  type SkillSummary,
+} from '../src/api/registry.js';
+
+function skill(overrides: Partial<SkillSummary>): SkillSummary {
+  return {
+    id: 'skill',
+    name: 'Skill',
+    description: 'A reusable skill.',
+    triggers: [],
+    mode: 'prototype',
+    previewType: 'html',
+    designSystemRequired: true,
+    defaultFor: [],
+    upstream: null,
+    hasBody: true,
+    examplePrompt: '',
+    aggregatesExamples: false,
+    ...overrides,
+  };
+}
+
+describe('buildSkillCatalogTree', () => {
+  it('groups skills by mode and scenario with deterministic labels', () => {
+    const tree = buildSkillCatalogTree([
+      skill({ id: 'deck', name: 'Deck', mode: 'deck', scenario: 'product' }),
+      skill({ id: 'web', name: 'Web', mode: 'prototype', scenario: 'design' }),
+      skill({ id: 'image', name: 'Image', mode: 'image', scenario: null }),
+    ]);
+
+    expect(tree.total).toBe(3);
+    expect(tree.modes.map((mode) => mode.id)).toEqual([
+      'prototype',
+      'deck',
+      'image',
+    ]);
+    expect(tree.modes[0]?.scenarios[0]).toMatchObject({
+      id: 'design',
+      label: 'Design',
+      count: 1,
+    });
+    expect(tree.modes[2]?.scenarios[0]).toMatchObject({
+      id: 'general',
+      label: 'General',
+      count: 1,
+    });
+  });
+
+  it('sorts default and featured skills before regular skills stably', () => {
+    const tree = buildSkillCatalogTree([
+      skill({ id: 'regular-b', name: 'Regular B', scenario: 'design' }),
+      skill({
+        id: 'featured-two',
+        name: 'Featured two',
+        featured: 2,
+        scenario: 'design',
+      }),
+      skill({
+        id: 'default',
+        name: 'Default',
+        defaultFor: ['prototype'],
+        scenario: 'design',
+      }),
+      skill({
+        id: 'featured-one',
+        name: 'Featured one',
+        featured: 1,
+        scenario: 'design',
+      }),
+      skill({ id: 'regular-a', name: 'Regular A', scenario: 'design' }),
+    ]);
+
+    expect(
+      tree.modes[0]?.scenarios[0]?.skills.map((treeSkill) => treeSkill.id),
+    ).toEqual([
+      'default',
+      'featured-one',
+      'featured-two',
+      'regular-a',
+      'regular-b',
+    ]);
+  });
+
+  it('keeps the original skill summary on leaf nodes', () => {
+    const source = skill({
+      id: 'dashboard',
+      name: 'Dashboard',
+      scenario: 'operation',
+      platform: 'desktop',
+      previewType: 'jsx',
+      designSystemRequired: false,
+      examplePrompt: 'Build an ops dashboard.',
+      category: 'ops-tools',
+      source: 'built-in',
+    });
+
+    const tree = buildSkillCatalogTree([source]);
+    const leaf = tree.modes[0]?.scenarios[0]?.skills[0];
+
+    expect(leaf).toMatchObject({
+      id: 'dashboard',
+      platform: 'desktop',
+      previewType: 'jsx',
+      designSystemRequired: false,
+      examplePrompt: 'Build an ops dashboard.',
+      category: 'ops-tools',
+      source: 'built-in',
+    });
+    expect(leaf?.skill).toBe(source);
+  });
+});
+
+describe('parseSkillSummaries', () => {
+  it('accepts valid skill summary arrays', () => {
+    const summaries = parseSkillSummaries([
+      skill({ id: 'dashboard', name: 'Dashboard' }),
+    ]);
+
+    expect(summaries).toHaveLength(1);
+    expect(summaries[0]?.id).toBe('dashboard');
+  });
+
+  it('rejects malformed skill summary array elements', () => {
+    expect(() => parseSkillSummaries([
+      skill({ id: 'dashboard', name: 'Dashboard' }),
+      { id: 'broken', mode: 'prototype' },
+    ])).toThrow();
+  });
+});