diff --git a/.cursor-plugin/marketplace.json b/.cursor-plugin/marketplace.json
index 26e915af6..7c28607ad 100644
--- a/.cursor-plugin/marketplace.json
+++ b/.cursor-plugin/marketplace.json
@@ -527,6 +527,11 @@
       "name": "square",
       "source": "third_party/square",
       "description": "Work with payments, orders, catalog, customers, and invoices."
+    },
+    {
+      "name": "commsync",
+      "source": "third_party/commsync",
+      "description": "Read, search, and send SMS and email from one shared inbox."
     }
   ]
 }
diff --git a/README.md b/README.md
index 680205da0..a39085a8c 100644
--- a/README.md
+++ b/README.md
@@ -76,6 +76,7 @@ Official Cursor plugins for popular developer tools, frameworks, and SaaS produc
 | `xero` | [Xero](third_party/xero/) | Cursor | Integrations | Read and write invoices, contacts, reports, and payroll. |
 | `x-ads` | [X Ads](third_party/x-ads/) | Cursor | Integrations | Manage ad campaigns, create ads, track conversions, and pull performance stats. |
 | `attio` | [Attio](third_party/attio/) | Cursor | Integrations | Search and update CRM records, lists, notes, and tasks. |
+| `commsync` | [CommSync](third_party/commsync/) | CommSync | Integrations | Read, search, and send SMS and email from one shared inbox. |
 | `hunter` | [Hunter](third_party/hunter/) | Cursor | Integrations | Find and verify emails, discover companies, and save leads. |
 | `gamma` | [Gamma](third_party/gamma/) | Cursor | Integrations | Generate presentations, documents, and webpages. |
 | `teams` | [Teams](third_party/teams/) | Cursor | Productivity | Search, read, and send Microsoft Teams chats and channel messages. |
diff --git a/third_party/commsync/.cursor-plugin/plugin.json b/third_party/commsync/.cursor-plugin/plugin.json
new file mode 100644
index 000000000..3dcb3e210
--- /dev/null
+++ b/third_party/commsync/.cursor-plugin/plugin.json
@@ -0,0 +1,32 @@
+{
+  "name": "commsync",
+  "displayName": "CommSync",
+  "version": "1.0.0",
+  "description": "Read, search, and send SMS and email from one shared inbox.",
+  "author": {
+    "name": "CommSync",
+    "email": "support@commsync.ai"
+  },
+  "homepage": "https://commsync.ai/docs/connect-ai-apps",
+  "repository": "https://github.com/cursor/plugins",
+  "license": "MIT",
+  "logo": "assets/logo.png",
+  "keywords": [
+    "commsync",
+    "sms",
+    "email",
+    "inbox",
+    "texting",
+    "mcp",
+    "contacts",
+    "messaging"
+  ],
+  "category": "integrations",
+  "tags": [
+    "commsync",
+    "sms",
+    "email",
+    "mcp"
+  ],
+  "mcpServers": "./mcp.json"
+}
diff --git a/third_party/commsync/CHANGELOG.md b/third_party/commsync/CHANGELOG.md
new file mode 100644
index 000000000..d2d253473
--- /dev/null
+++ b/third_party/commsync/CHANGELOG.md
@@ -0,0 +1,9 @@
+# Changelog
+
+All notable changes to this plugin will be documented here.
+
+## 1.0.0 — initial release
+
+- Added the `commsync` MCP server pointing at CommSync's hosted Streamable HTTP endpoint (`https://server.commsync.ai/api/mcp`).
+- Auth uses OAuth with CommSync user login and dynamic client registration — no API key or client ID to configure. The user picks which phone and email lines Cursor can use on the consent screen.
+- Logo: CommSync's official app mark.
diff --git a/third_party/commsync/LICENSE b/third_party/commsync/LICENSE
new file mode 100644
index 000000000..79d9e8935
--- /dev/null
+++ b/third_party/commsync/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 CommSync
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/third_party/commsync/README.md b/third_party/commsync/README.md
new file mode 100644
index 000000000..220c42d0d
--- /dev/null
+++ b/third_party/commsync/README.md
@@ -0,0 +1,56 @@
+# CommSync
+
+Cursor plugin that connects agents to [CommSync](https://commsync.ai) through CommSync's official remote [Model Context Protocol](https://modelcontextprotocol.io/) server.
+
+CommSync is one inbox for business SMS and email. Agents can search and read conversations across the user's phone numbers and mailboxes, manage contacts and labels, triage threads, and send texts and emails from the lines the user allows.
+
+## Install
+
+1. Open **Cursor Settings → Plugins**.
+2. Search for **CommSync**.
+3. Click **Install**, then complete the CommSync sign-in prompt.
+
+Or run `/add-plugin commsync` in chat.
+
+## MCP
+
+```json
+{
+  "mcpServers": {
+    "commsync": {
+      "type": "http",
+      "url": "https://server.commsync.ai/api/mcp"
+    }
+  }
+}
+```
+
+Auth is OAuth 2.1 against CommSync (PKCE, dynamic client registration). Cursor prompts for CommSync login when the plugin connects. On the consent screen the user chooses which phone and email lines Cursor may read and send from. There is no API key or client ID to configure.
+
+## Before you connect
+
+You need a CommSync account in a workspace with at least one connected phone number or email account. Access follows the user's role in their workspace, so an agent sees only the lines that user can see.
+
+## What agents can do
+
+| Category | Capabilities |
+| --- | --- |
+| Threads | List, read, and search SMS and email conversations; mark read, archive, snooze, and move between Inbox, Spam, Promotions, and Automated |
+| Sending | Reply to or start SMS and email conversations, forward messages, and check send capacity |
+| Contacts | Search, create, update, and merge contacts and their phone and email identities |
+| Labels | Create labels and assign them to contacts |
+| Search | Full-text search across messages, contacts, and threads with match snippets |
+| AI | Read the Daily Brief and AI settings |
+| Channels | List connected phone numbers and email accounts |
+| Webhooks | Register and manage outbound webhook endpoints |
+
+Every write tool is annotated. Sends are marked destructive and open-world so Cursor asks before it sends.
+
+The hosted runtime is the source of truth for tool names and schemas.
+
+## Links
+
+- Docs: <https://commsync.ai/docs/mcp>
+- Setup guide: <https://commsync.ai/docs/connect-ai-apps>
+- Privacy: <https://commsync.ai/privacy>
+- Support: <support@commsync.ai>
diff --git a/third_party/commsync/assets/logo.png b/third_party/commsync/assets/logo.png
new file mode 100644
index 000000000..5962b717a
Binary files /dev/null and b/third_party/commsync/assets/logo.png differ
diff --git a/third_party/commsync/mcp.json b/third_party/commsync/mcp.json
new file mode 100644
index 000000000..c0b12c1d4
--- /dev/null
+++ b/third_party/commsync/mcp.json
@@ -0,0 +1,8 @@
+{
+  "mcpServers": {
+    "commsync": {
+      "type": "http",
+      "url": "https://server.commsync.ai/api/mcp"
+    }
+  }
+}