feat: add marketing tools registry for agent discovery

Create centralized tools/ directory with REGISTRY.md index and 29
integration guides covering analytics, SEO, CRM, payments, referral,
email, ads, automation, and commerce platforms.

Each guide includes API endpoints, authentication, common operations,
and links to relevant skills. Updated AGENTS.md and key skills
(referral-program, analytics-tracking, email-sequence, paid-ads)
with tool integration references.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tools/integrations/dub-co.md

@@ -0,0 +1,160 @@
+# Dub.co
+
+Link management and attribution platform for modern marketing teams.
+
+## Capabilities
+
+| Integration | Available | Notes |
+|-------------|-----------|-------|
+| API | ✓ | REST API for links, analytics, domains |
+| MCP | - | Not available |
+| CLI | - | Not available |
+| SDK | ✓ | TypeScript SDK available |
+
+## Authentication
+
+- **Type**: API Key
+- **Header**: `Authorization: Bearer {api_key}`
+- **Get key**: Settings > API Keys in Dub dashboard
+
+## Common Agent Operations
+
+### Create short link
+
+```bash
+POST https://api.dub.co/links
+
+{
+  "url": "https://example.com/landing-page",
+  "domain": "link.example.com",
+  "key": "summer-sale",
+  "tags": ["campaign:summer", "channel:email"]
+}
+```
+
+### Get link by key
+
+```bash
+GET https://api.dub.co/links?domain=link.example.com&key=summer-sale
+```
+
+### List links
+
+```bash
+GET https://api.dub.co/links?domain=link.example.com&page=1
+```
+
+### Get link analytics
+
+```bash
+GET https://api.dub.co/analytics?domain=link.example.com&key=summer-sale&interval=30d
+```
+
+### Get clicks by location
+
+```bash
+GET https://api.dub.co/analytics/country?domain=link.example.com&key=summer-sale
+```
+
+### Get clicks by device
+
+```bash
+GET https://api.dub.co/analytics/device?domain=link.example.com&key=summer-sale
+```
+
+### Update link
+
+```bash
+PATCH https://api.dub.co/links/{link_id}
+
+{
+  "url": "https://example.com/new-landing-page",
+  "tags": ["campaign:summer", "channel:social"]
+}
+```
+
+### Delete link
+
+```bash
+DELETE https://api.dub.co/links/{link_id}
+```
+
+### Bulk create links
+
+```bash
+POST https://api.dub.co/links/bulk
+
+[
+  {"url": "https://example.com/page1", "key": "page1"},
+  {"url": "https://example.com/page2", "key": "page2"}
+]
+```
+
+## TypeScript SDK
+
+### Install
+
+```bash
+npm install dub
+```
+
+### Usage
+
+```typescript
+import { Dub } from "dub";
+
+const dub = new Dub({ token: "YOUR_API_KEY" });
+
+// Create link
+const link = await dub.links.create({
+  url: "https://example.com",
+  domain: "link.example.com"
+});
+
+// Get analytics
+const analytics = await dub.analytics.retrieve({
+  domain: "link.example.com",
+  key: "summer-sale"
+});
+```
+
+## Key Features
+
+- **Custom domains** - Use your own branded domains
+- **Link analytics** - Clicks, locations, devices, referrers
+- **Tags** - Organize links by campaign, channel, etc.
+- **QR codes** - Auto-generated for each link
+- **Password protection** - Secure sensitive links
+- **Expiration** - Time-limited links
+- **Geo-targeting** - Redirect based on location
+
+## Analytics Dimensions
+
+- `clicks` - Total click count
+- `country` - Clicks by country
+- `city` - Clicks by city
+- `device` - Clicks by device type
+- `browser` - Clicks by browser
+- `os` - Clicks by operating system
+- `referer` - Clicks by referrer
+
+## When to Use
+
+- Creating trackable marketing links
+- Building referral link systems
+- Tracking campaign attribution
+- A/B testing landing pages via links
+- Generating branded short URLs
+- Analyzing link performance
+
+## Rate Limits
+
+- Free: 1,000 links, 5 API requests/second
+- Pro: Unlimited links, 50 API requests/second
+- Enterprise: Custom limits
+
+## Relevant Skills
+
+- referral-program
+- analytics-tracking
+- paid-ads