diff --git a/.cursor-plugin/marketplace.json b/.cursor-plugin/marketplace.json
index 82b2063e0..54c2c8fe9 100644
--- a/.cursor-plugin/marketplace.json
+++ b/.cursor-plugin/marketplace.json
@@ -637,6 +637,11 @@
       "name": "vanta",
       "source": "third_party/vanta",
       "description": "Query and remediate compliance tests, controls, frameworks, risks, and vulnerabilities in Vanta."
+    },
+    {
+      "name": "lannis",
+      "source": "third_party/lannis",
+      "description": "Issue invoices and track your taxes in Argentina."
     }
   ]
 }
diff --git a/README.md b/README.md
index 627b76c9f..6efc164d4 100644
--- a/README.md
+++ b/README.md
@@ -117,6 +117,7 @@ Official Cursor plugins for popular developer tools, frameworks, and SaaS produc
 | `feishu` | [Feishu](third_party/feishu/) | Cursor | Integrations | Search, create, and update Feishu docs, and read Feishu messages and groups. |
 | `framer` | [Framer](third_party/framer/) | Cursor | Integrations | Design, build, and edit your Framer sites, pages, and CMS content. |
 | `vanta` | [Vanta](third_party/vanta/) | Cursor | Integrations | Query and remediate compliance tests, controls, frameworks, risks, and vulnerabilities in Vanta. |
+| `lannis` | [Lannis](third_party/lannis/) | Lannis | Integrations | Issue invoices and track your taxes in Argentina. |
 Author values match each plugin’s `plugin.json` `author.name` (Cursor lists `plugins@cursor.com` in the manifest).
 
 ## Repository structure
diff --git a/third_party/lannis/.cursor-plugin/plugin.json b/third_party/lannis/.cursor-plugin/plugin.json
new file mode 100644
index 000000000..1ce67ecd1
--- /dev/null
+++ b/third_party/lannis/.cursor-plugin/plugin.json
@@ -0,0 +1,29 @@
+{
+  "name": "lannis",
+  "displayName": "Lannis",
+  "version": "1.0.0",
+  "description": "Issue invoices and track your taxes in Argentina.",
+  "author": {
+    "name": "Lannis",
+    "email": "joaquin@lannis.app"
+  },
+  "homepage": "https://lannis.app",
+  "repository": "https://github.com/cursor/plugins",
+  "license": "MIT",
+  "logo": "https://lannis.app/icon-512.png",
+  "keywords": [
+    "lannis",
+    "invoicing",
+    "taxes",
+    "argentina",
+    "mcp"
+  ],
+  "category": "integrations",
+  "tags": [
+    "lannis",
+    "finance",
+    "invoicing",
+    "mcp"
+  ],
+  "mcpServers": "./mcp.json"
+}
diff --git a/third_party/lannis/CHANGELOG.md b/third_party/lannis/CHANGELOG.md
new file mode 100644
index 000000000..5b573f988
--- /dev/null
+++ b/third_party/lannis/CHANGELOG.md
@@ -0,0 +1,9 @@
+# Changelog
+
+All notable changes to this plugin will be documented here.
+
+## 1.0.0 — initial release
+
+- Added the `lannis` MCP server pointing at Lannis's hosted endpoint (`https://mcp.lannis.app/mcp`).
+- Auth uses OAuth with Lannis user sign-in.
+- Logo: references the publisher-submitted URL (`https://lannis.app/icon-512.png`); the file could not be downloaded when this plugin was added.
diff --git a/third_party/lannis/LICENSE b/third_party/lannis/LICENSE
new file mode 100644
index 000000000..ca2bba771
--- /dev/null
+++ b/third_party/lannis/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Cursor
+
+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/lannis/README.md b/third_party/lannis/README.md
new file mode 100644
index 000000000..d15913d16
--- /dev/null
+++ b/third_party/lannis/README.md
@@ -0,0 +1,57 @@
+# Lannis
+
+Cursor plugin that connects agents to [Lannis](https://lannis.app) through Lannis's hosted [Model Context Protocol](https://modelcontextprotocol.io/) server.
+
+Issue invoices and track your taxes in Argentina ("Facturá y seguí tus impuestos").
+
+## Install
+
+1. Open **Cursor Settings → Plugins**.
+2. Search for **Lannis**.
+3. Click **Install**, then complete the Lannis sign-in prompt.
+
+Or run `/add-plugin lannis` in chat.
+
+## MCP
+
+```json
+{
+  "mcpServers": {
+    "lannis": {
+      "type": "http",
+      "url": "https://mcp.lannis.app/mcp"
+    }
+  }
+}
+```
+
+Auth is OAuth. Cursor prompts for Lannis sign-in when the plugin connects — there is no API key to configure.
+
+## Before you connect
+
+You need a Lannis account.
+
+## What agents can do
+
+| Category | Capabilities |
+| --- | --- |
+| Invoices | List invoices and totals for a period; preview and issue new invoices after you approve them |
+| Taxes | Track tax obligations and generate VEP payment slips to pay at your bank |
+
+The hosted runtime is the source of truth for tool names and schemas.
+
+## Notes
+
+- Tool calls run under the Lannis account of the user who authorizes the connection.
+- Issuing an invoice is shown as a preview first and only happens after you approve it.
+
+## Docs
+
+- Lannis: https://lannis.app
+- Server URL: https://mcp.lannis.app/mcp
+
+The logo references the publisher-submitted URL (`https://lannis.app/icon-512.png`). lannis.app could not be reached when this plugin was added, so the file was not committed.
+
+## License
+
+MIT
diff --git a/third_party/lannis/mcp.json b/third_party/lannis/mcp.json
new file mode 100644
index 000000000..50644ae0f
--- /dev/null
+++ b/third_party/lannis/mcp.json
@@ -0,0 +1,8 @@
+{
+  "mcpServers": {
+    "lannis": {
+      "type": "http",
+      "url": "https://mcp.lannis.app/mcp"
+    }
+  }
+}