feat: Design API support + suppression group create/delete tools

README.md

@@ -205,6 +205,24 @@ List all unsubscribe groups.
 // No parameters required
 ```
 
+#### create_suppression_group
+Create an unsubscribe (ASM suppression) group. Emails sent with the group get a working unsubscribe link and SendGrid enforces the suppression list.
+```typescript
+{
+  name: string;         // Required: Shown to recipients on the unsubscribe page (max 30 chars)
+  description: string;  // Required: What kind of emails this covers (max 100 chars)
+  is_default?: boolean; // Optional: Use when a send specifies no group (default false)
+}
+```
+
+#### delete_suppression_group
+Delete an unsubscribe group by its numeric ID.
+```typescript
+{
+  group_id: number;  // Required: Numeric suppression group ID
+}
+```
+
 ## Installation
 
 ```bash

src/services/sendgrid.ts

@@ -1,6 +1,6 @@
 import { Client } from '@sendgrid/client';
 import sgMail from '@sendgrid/mail';
-import { SendGridContact, SendGridList, SendGridTemplate, SendGridStats, SendGridSingleSend } from '../types/index.js';
+import { SendGridContact, SendGridList, SendGridTemplate, SendGridStats, SendGridSingleSend, SendGridDesign } from '../types/index.js';
 
 export class SendGridService {
   private client: Client;
@@ -308,6 +308,122 @@ export class SendGridService {
     return response.body;
   }
 
+  async createSuppressionGroup(params: {
+    name: string;
+    description: string;
+    is_default?: boolean;
+  }): Promise<{ id: number; name: string; description: string; is_default: boolean }> {
+    const [response] = await this.client.request({
+      method: 'POST',
+      url: '/v3/asm/groups',
+      body: params
+    });
+    return response.body as { id: number; name: string; description: string; is_default: boolean };
+  }
+
+  async deleteSuppressionGroup(groupId: number) {
+    const [response] = await this.client.request({
+      method: 'DELETE',
+      url: `/v3/asm/groups/${groupId}`
+    });
+    return response.body;
+  }
+
+  // Design Management
+  async listDesigns(pageSize: number = 100): Promise<SendGridDesign[]> {
+    const allDesigns: SendGridDesign[] = [];
+    let pageToken: string | undefined;
+
+    do {
+      const qs: Record<string, any> = { page_size: pageSize };
+      if (pageToken) {
+        qs.page_token = pageToken;
+      }
+
+      const [response] = await this.client.request({
+        method: 'GET',
+        url: '/v3/designs',
+        qs
+      });
+
+      const body = response.body as {
+        result: SendGridDesign[];
+        _metadata: { self: string; count: number; next?: string };
+      };
+      allDesigns.push(...(body.result || []));
+
+      // Extract page_token from next URL if present
+      if (body._metadata?.next) {
+        const url = new URL(body._metadata.next, 'https://api.sendgrid.com');
+        pageToken = url.searchParams.get('page_token') || undefined;
+      } else {
+        pageToken = undefined;
+      }
+    } while (pageToken);
+
+    return allDesigns;
+  }
+
+  async getDesign(designId: string): Promise<SendGridDesign> {
+    const [response] = await this.client.request({
+      method: 'GET',
+      url: `/v3/designs/${designId}`
+    });
+    return response.body as SendGridDesign;
+  }
+
+  async createDesign(params: {
+    name: string;
+    html_content: string;
+    plain_content?: string;
+    subject?: string;
+    editor?: string;
+    generate_plain_content?: boolean;
+    categories?: string[];
+  }): Promise<SendGridDesign> {
+    const [response] = await this.client.request({
+      method: 'POST',
+      url: '/v3/designs',
+      body: params
+    });
+    return response.body as SendGridDesign;
+  }
+
+  async updateDesign(designId: string, params: {
+    name?: string;
+    html_content?: string;
+    plain_content?: string;
+    subject?: string;
+    categories?: string[];
+    generate_plain_content?: boolean;
+  }): Promise<SendGridDesign> {
+    const [response] = await this.client.request({
+      method: 'PATCH',
+      url: `/v3/designs/${designId}`,
+      body: params
+    });
+    return response.body as SendGridDesign;
+  }
+
+  async deleteDesign(designId: string): Promise<void> {
+    await this.client.request({
+      method: 'DELETE',
+      url: `/v3/designs/${designId}`
+    });
+  }
+
+  async duplicateDesign(designId: string, params?: {
+    name?: string;
+    editor?: string;
+  }): Promise<SendGridDesign> {
+    const [response] = await this.client.request({
+      method: 'POST',
+      url: `/v3/designs/${designId}`,
+      body: params || {}
+    });
+    return response.body as SendGridDesign;
+  }
+
   // Verified Senders
   async getVerifiedSenders() {
     const [response] = await this.client.request({