diff --git a/skills/salesforce-custom-tab/SKILL.md b/skills/salesforce-custom-tab/SKILL.md
index d10861f..865f82b 100644
--- a/skills/salesforce-custom-tab/SKILL.md
+++ b/skills/salesforce-custom-tab/SKILL.md
@@ -27,27 +27,99 @@ Custom tabs for navigating to objects, web content, or Visualforce pages within
 ## ⚙️ Required Properties
 
 ### Core Tab Properties
-- **label**: Display name of the tab
-- **fullName**: API name of the object (for object tabs)
+- **customObject**: `true` for custom object tabs, `false` for all others.
+- **motif**: Tab icon style — choose a motif that semantically matches the object's purpose. Do NOT reuse the same motif for every tab.
+- **label**: Display name (required for non-object tabs ONLY; object tabs inherit label from the object)
 - **url**: Web URL (for web tabs)
 - **page**: Visualforce page name (for Visualforce tabs)
 
+
+### 🚨 STRICT ELEMENT ALLOWLIST — READ THIS FIRST
+
+**The root element MUST always be `<CustomTab>` (NOT `<Tab>`).** The XML namespace must be `xmlns="http://soap.sforce.com/2006/04/metadata"`.
+
+Only the elements listed below are valid. **Any element not on this list WILL cause a deployment error.**
+
+| Tab Type | ONLY these elements are allowed (nothing else) |
+|---|---|
+| **Object tabs** | `<customObject>` (required, set to `true`), `<motif>` (required), `<description>` (optional) |
+| **Web tabs** | `<customObject>` (required, set to `false`), `<label>` (required), `<motif>` (required), `<url>` (required), `<urlEncodingKey>` (required, set to `UTF-8`), `<description>` (optional), `<frameHeight>` (optional) |
+| **Visualforce tabs** | `<customObject>` (required, set to `false`), `<label>` (required), `<motif>` (required), `<page>` (required), `<description>` (optional) |
+
+### ⚠️ FORBIDDEN ELEMENTS (every one of these causes a deployment error)
+`<sobjectName>`, `<name>`, `<fullName>`, `<apiVersion>`, `<isHidden>`, `<tabVisibility>`, `<type>`, `<mobileReady>`, `<urlFrameHeight>`, `<urlType>`, `<urlRedirect>`, `<encodingKey>`, `<height>`, `<auraComponent>`
+
+Also forbidden:
+- `<label>` on object tabs (object tabs inherit their label from the custom object)
+- `<page>` on web tabs (only for Visualforce tabs)
+- Empty elements like `<page></page>` or `<description></description>`
+- Any element not in the allowlist table above
+
 ## 🔧 Tab Types
 
 ### Object Tabs
 - **Purpose**: Navigate to custom or standard objects
-- **Required**: `fullName` property (set to object API name)
-- **Example**: `<fullName>CustomObject__c</fullName>`
+- **File name** determines the object: `{ObjectApiName}.tab-meta.xml` (e.g., `Space_Station__c.tab-meta.xml`)
+- **Required elements**: `<customObject>true</customObject>` and `<motif>`
+- **Correct example** (for a Space_Station__c.tab-meta.xml):
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<CustomTab xmlns="http://soap.sforce.com/2006/04/metadata">
+    <customObject>true</customObject>
+    <motif>Custom39: Telescope</motif>
+</CustomTab>
+```
+- **Correct example** (for a Supply__c.tab-meta.xml — note different motif):
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<CustomTab xmlns="http://soap.sforce.com/2006/04/metadata">
+    <customObject>true</customObject>
+    <motif>Custom98: Truck</motif>
+</CustomTab>
+```
+- **❌ WRONG** — do NOT add `<sobjectName>`, `<name>`, `<fullName>`, or `<label>`:
+```xml
+<CustomTab xmlns="http://soap.sforce.com/2006/04/metadata">
+    <sobjectName>Space_Station__c</sobjectName>  <!-- DEPLOYMENT ERROR -->
+    <label>Space Station</label>                  <!-- DEPLOYMENT ERROR on object tabs -->
+    <customObject>true</customObject>
+    <motif>Custom57: Desert</motif>
+</CustomTab>
+```
 
 ### Web Tabs
 - **Purpose**: Link to external websites or web applications
-- **Required**: `url` property
-- **Example**: `<url>https://example.com</url>`
+- **File name**: Use a descriptive name: `{TabName}.tab-meta.xml` (e.g., `Knowledge_Base.tab-meta.xml`)
+- **COPY THIS EXACT TEMPLATE** — only replace the placeholder values. Do NOT add, remove, or rename any XML elements:
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<CustomTab xmlns="http://soap.sforce.com/2006/04/metadata">
+    <customObject>false</customObject>
+    <description>REPLACE_WITH_DESCRIPTION</description>
+    <frameHeight>600</frameHeight>
+    <label>REPLACE_WITH_LABEL</label>
+    <motif>REPLACE_WITH_MOTIF</motif>
+    <url>REPLACE_WITH_URL</url>
+    <urlEncodingKey>UTF-8</urlEncodingKey>
+</CustomTab>
+```
+- **These 7 elements above are the ONLY elements allowed in a web tab file.** Do not add ANY other elements.
+- The `<description>` element is optional — you may remove it if not needed, but do not add anything else.
 
 ### Visualforce Tabs
 - **Purpose**: Access custom Visualforce pages
-- **Required**: `page` property
-- **Example**: `<page>CustomPage</page>`
+- **File name**: `{TabName}.tab-meta.xml` (e.g., `Custom_Page_Tab.tab-meta.xml`)
+- **Required elements**: `<customObject>false</customObject>`, `<label>`, `<motif>`, `<page>`
+- **Correct example**:
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<CustomTab xmlns="http://soap.sforce.com/2006/04/metadata">
+    <customObject>false</customObject>
+    <label>Custom Page</label>
+    <motif>Custom46: Computer</motif>
+    <page>CustomPage</page>
+</CustomTab>
+```
 
 ## 🎨 Tab Configuration
 
@@ -72,7 +144,11 @@ Custom tabs for navigating to objects, web content, or Visualforce pages within
 ## ✅ Best Practices
 - Use clear, descriptive tab labels
 - Choose appropriate tab types for functionality
+- **Select a unique, contextually relevant motif for each tab** — do not default every tab to the same icon
 - Consider user experience and navigation flow
 - Test tab functionality across different applications
 - Ensure proper permissions and visibility settings
 - Follow consistent naming conventions
+- Object tab files MUST only contain `<customObject>true</customObject>` and `<motif>` — nothing else
+- Web tab files MUST only contain: `<customObject>false</customObject>`, `<label>`, `<motif>`, `<url>`, `<urlEncodingKey>`, and optionally `<description>`, `<frameHeight>` — nothing else
+- Never include `<isHidden>`, `<tabVisibility>`, `<type>`, `<mobileReady>`, or empty elements
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