chore: bump version to 0.1.7 and add CHANGELOG entry for multi-catalog support

Remove f-prefix from strings with no placeholders in catalog_remove
and extension_search commands.

Co-authored-by: mnriem <15701806+mnriem@users.noreply.github.com>

.github/workflows/docs.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Fetch all history for git info
 

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Run markdownlint-cli2
         uses: DavidAnson/markdownlint-cli2-action@v19

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test.yml

@@ -16,10 +16,10 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v6
+        uses: astral-sh/setup-uv@v7
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: "3.13"
 
@@ -36,10 +36,10 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v6
+        uses: astral-sh/setup-uv@v7
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
 

CHANGELOG.md

@@ -7,6 +7,25 @@ Recent changes to the Specify CLI and templates are documented here.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.1.7] - 2026-02-27
+
+### Added
+
+- **Multi-Catalog Support (#1707)**: Extension catalog system now supports multiple active catalogs simultaneously via a catalog stack
+  - New `specify extension catalogs` command lists all active catalogs with name, URL, priority, and `install_allowed` status
+  - New `specify extension catalog add` and `specify extension catalog remove` commands for project-scoped catalog management
+  - Default built-in stack includes `catalog.json` (org-approved, installable) and `catalog.community.json` (discovery only) — community extensions are now surfaced in search results out of the box
+  - `specify extension search` aggregates results across all active catalogs, annotating each result with source catalog
+  - `specify extension add` enforces `install_allowed` policy — extensions from discovery-only catalogs cannot be installed directly
+  - Project-level `.specify/extension-catalogs.yml` and user-level `~/.specify/extension-catalogs.yml` config files supported, with project-level taking precedence
+  - `SPECKIT_CATALOG_URL` environment variable still works for backward compatibility (replaces full stack with single catalog)
+  - All catalog URLs require HTTPS (HTTP allowed for localhost development)
+  - New `CatalogEntry` dataclass in `extensions.py` for catalog stack representation
+  - Per-URL hash-based caching for non-default catalogs; legacy cache preserved for default catalog
+  - Higher-priority catalogs win on merge conflicts (same extension id in multiple catalogs)
+  - 13 new tests covering catalog stack resolution, merge conflicts, URL validation, and `install_allowed` enforcement
+  - Updated RFC, Extension User Guide, and Extension API Reference documentation
+
 ## [0.1.6] - 2026-02-23
 
 ### Fixed

extensions/EXTENSION-API-REFERENCE.md

@@ -243,6 +243,32 @@ manager.check_compatibility(
 )  # Raises: CompatibilityError if incompatible
 ```
 
+### CatalogEntry
+
+**Module**: `specify_cli.extensions`
+
+Represents a single catalog in the active catalog stack.
+
+```python
+from specify_cli.extensions import CatalogEntry
+
+entry = CatalogEntry(
+    url="https://example.com/catalog.json",
+    name="org-approved",
+    priority=1,
+    install_allowed=True,
+)
+```
+
+**Fields**:
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `url` | `str` | Catalog URL (must use HTTPS, or HTTP for localhost) |
+| `name` | `str` | Human-readable catalog name |
+| `priority` | `int` | Sort order (lower = higher priority, wins on conflicts) |
+| `install_allowed` | `bool` | Whether extensions from this catalog can be installed |
+
 ### ExtensionCatalog
 
 **Module**: `specify_cli.extensions`
@@ -253,30 +279,65 @@ from specify_cli.extensions import ExtensionCatalog
 catalog = ExtensionCatalog(project_root)
 ```
 
+**Class attributes**:
+
+```python
+ExtensionCatalog.DEFAULT_CATALOG_URL    # org-approved catalog URL
+ExtensionCatalog.COMMUNITY_CATALOG_URL  # community catalog URL
+```
+
 **Methods**:
 
 ```python
-# Fetch catalog
+# Get the ordered list of active catalogs
+entries = catalog.get_active_catalogs()  # List[CatalogEntry]
+
+# Fetch catalog (primary catalog, backward compat)
 catalog_data = catalog.fetch_catalog(force_refresh: bool = False)  # Dict
 
-# Search extensions
+# Search extensions across all active catalogs
+# Each result includes _catalog_name and _install_allowed
 results = catalog.search(
     query: Optional[str] = None,
     tag: Optional[str] = None,
     author: Optional[str] = None,
     verified_only: bool = False
-)  # Returns: List[Dict]
+)  # Returns: List[Dict]  — each dict includes _catalog_name, _install_allowed
 
-# Get extension info
+# Get extension info (searches all active catalogs)
+# Returns None if not found; includes _catalog_name and _install_allowed
 ext_info = catalog.get_extension_info(extension_id: str)  # Optional[Dict]
 
-# Check cache validity
+# Check cache validity (primary catalog)
 is_valid = catalog.is_cache_valid()  # bool
 
-# Clear cache
+# Clear all catalog caches
 catalog.clear_cache()
 ```
 
+**Result annotation fields**:
+
+Each extension dict returned by `search()` and `get_extension_info()` includes:
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `_catalog_name` | `str` | Name of the source catalog |
+| `_install_allowed` | `bool` | Whether installation is allowed from this catalog |
+
+**Catalog config file** (`.specify/extension-catalogs.yml`):
+
+```yaml
+catalogs:
+  - name: "org-approved"
+    url: "https://example.com/catalog.json"
+    priority: 1
+    install_allowed: true
+  - name: "community"
+    url: "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json"
+    priority: 2
+    install_allowed: false
+```
+
 ### HookExecutor
 
 **Module**: `specify_cli.extensions`
@@ -543,6 +604,38 @@ EXECUTE_COMMAND: {command}
 
 **Output**: List of installed extensions with metadata
 
+### extension catalogs
+
+**Usage**: `specify extension catalogs`
+
+Lists all active catalogs in the current catalog stack, showing name, URL, priority, and `install_allowed` status.
+
+### extension catalog add
+
+**Usage**: `specify extension catalog add URL [OPTIONS]`
+
+**Options**:
+
+- `--name NAME` - Catalog name (required)
+- `--priority INT` - Priority (lower = higher priority, default: 10)
+- `--install-allowed / --no-install-allowed` - Allow installs from this catalog (default: false)
+
+**Arguments**:
+
+- `URL` - Catalog URL (must use HTTPS)
+
+Adds a catalog entry to `.specify/extension-catalogs.yml`.
+
+### extension catalog remove
+
+**Usage**: `specify extension catalog remove NAME`
+
+**Arguments**:
+
+- `NAME` - Catalog name to remove
+
+Removes a catalog entry from `.specify/extension-catalogs.yml`.
+
 ### extension add
 
 **Usage**: `specify extension add EXTENSION [OPTIONS]`
@@ -551,13 +644,13 @@ EXECUTE_COMMAND: {command}
 
 - `--from URL` - Install from custom URL
 - `--dev PATH` - Install from local directory
-- `--version VERSION` - Install specific version
-- `--no-register` - Skip command registration
 
 **Arguments**:
 
 - `EXTENSION` - Extension name or URL
 
+**Note**: Extensions from catalogs with `install_allowed: false` cannot be installed via this command.
+
 ### extension remove
 
 **Usage**: `specify extension remove EXTENSION [OPTIONS]`
@@ -575,6 +668,8 @@ EXECUTE_COMMAND: {command}
 
 **Usage**: `specify extension search [QUERY] [OPTIONS]`
 
+Searches all active catalogs simultaneously. Results include source catalog name and install_allowed status.
+
 **Options**:
 
 - `--tag TAG` - Filter by tag
@@ -589,6 +684,8 @@ EXECUTE_COMMAND: {command}
 
 **Usage**: `specify extension info EXTENSION`
 
+Shows source catalog and install_allowed status.
+
 **Arguments**:
 
 - `EXTENSION` - Extension ID

extensions/EXTENSION-DEVELOPMENT-GUIDE.md

@@ -456,18 +456,20 @@ Users install with:
 specify extension add --from https://github.com/.../spec-kit-my-ext-1.0.0.zip
 ```
 
-### Option 3: Extension Catalog (Future)
+### Option 3: Community Reference Catalog
 
-Submit to official catalog:
+Submit to the community catalog for public discovery:
 
 1. **Fork** spec-kit repository
-2. **Add entry** to `extensions/catalog.json`
-3. **Create PR**
-4. **After merge**, users can install with:
+2. **Add entry** to `extensions/catalog.community.json`
+3. **Update** `extensions/README.md` with your extension
+4. **Create PR** following the [Extension Publishing Guide](EXTENSION-PUBLISHING-GUIDE.md)
+5. **After merge**, your extension becomes available:
+   - Users can browse `catalog.community.json` to discover your extension
+   - Users copy the entry to their own `catalog.json`
+   - Users install with: `specify extension add my-ext` (from their catalog)
 
-   ```bash
-   specify extension add my-ext  # No URL needed!
-   ```
+See the [Extension Publishing Guide](EXTENSION-PUBLISHING-GUIDE.md) for detailed submission instructions.
 
 ---
 

extensions/EXTENSION-PUBLISHING-GUIDE.md

@@ -129,26 +129,32 @@ specify extension add --from https://github.com/your-org/spec-kit-your-extension
 
 ## Submit to Catalog
 
+### Understanding the Catalogs
+
+Spec Kit uses a dual-catalog system. For details about how catalogs work, see the main [Extensions README](README.md#extension-catalogs).
+
+**For extension publishing**: All community extensions should be added to `catalog.community.json`. Users browse this catalog and copy extensions they trust into their own `catalog.json`.
+
 ### 1. Fork the spec-kit Repository
 
 ```bash
 # Fork on GitHub
-# https://github.com/statsperform/spec-kit/fork
+# https://github.com/github/spec-kit/fork
 
 # Clone your fork
 git clone https://github.com/YOUR-USERNAME/spec-kit.git
 cd spec-kit
 ```
 
-### 2. Add Extension to Catalog
+### 2. Add Extension to Community Catalog
 
-Edit `extensions/catalog.json` and add your extension:
+Edit `extensions/catalog.community.json` and add your extension:
 
 ```json
 {
   "schema_version": "1.0",
   "updated_at": "2026-01-28T15:54:00Z",
-  "catalog_url": "https://raw.githubusercontent.com/statsperform/spec-kit/main/extensions/catalog.json",
+  "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "your-extension": {
       "name": "Your Extension Name",
@@ -198,15 +204,25 @@ Edit `extensions/catalog.json` and add your extension:
 - Use current timestamp for `created_at` and `updated_at`
 - Update the top-level `updated_at` to current time
 
-### 3. Submit Pull Request
+### 3. Update Extensions README
+
+Add your extension to the Available Extensions table in `extensions/README.md`:
+
+```markdown
+| Your Extension Name | Brief description of what it does | [repo-name](https://github.com/your-org/spec-kit-your-extension) |
+```
+
+Insert your extension in alphabetical order in the table.
+
+### 4. Submit Pull Request
 
 ```bash
 # Create a branch
 git checkout -b add-your-extension
 
 # Commit your changes
-git add extensions/catalog.json
-git commit -m "Add your-extension to catalog
+git add extensions/catalog.community.json extensions/README.md
+git commit -m "Add your-extension to community catalog
 
 - Extension ID: your-extension
 - Version: 1.0.0
@@ -218,7 +234,7 @@ git commit -m "Add your-extension to catalog
 git push origin add-your-extension
 
 # Create Pull Request on GitHub
-# https://github.com/statsperform/spec-kit/compare
+# https://github.com/github/spec-kit/compare
 ```
 
 **Pull Request Template**:
@@ -243,6 +259,8 @@ Brief description of what your extension does.
 - [x] Extension tested on real project
 - [x] All commands working
 - [x] No security vulnerabilities
+- [x] Added to extensions/catalog.community.json
+- [x] Added to extensions/README.md Available Extensions table
 
 ### Testing
 Tested on:

extensions/EXTENSION-USER-GUIDE.md

@@ -76,13 +76,15 @@ vim .specify/extensions/jira/jira-config.yml
 
 ## Finding Extensions
 
+`specify extension search` searches **all active catalogs** simultaneously, including the community catalog by default. Results are annotated with their source catalog and install status.
+
 ### Browse All Extensions
 
 ```bash
 specify extension search
 ```
 
-Shows all available extensions in the catalog.
+Shows all extensions across all active catalogs (org-approved and community by default).
 
 ### Search by Keyword
 
@@ -400,13 +402,13 @@ In addition to extension-specific environment variables (`SPECKIT_{EXT_ID}_*`),
 
 | Variable | Description | Default |
 |----------|-------------|---------|
-| `SPECKIT_CATALOG_URL`       | Override the extension catalog URL | GitHub-hosted catalog |
+| `SPECKIT_CATALOG_URL`       | Override the full catalog stack with a single URL (backward compat) | Built-in default stack |
 | `GH_TOKEN` / `GITHUB_TOKEN` | GitHub API token for downloads     | None                  |
 
 #### Example: Using a custom catalog for testing
 
 ```bash
-# Point to a local or alternative catalog
+# Point to a local or alternative catalog (replaces the full stack)
 export SPECKIT_CATALOG_URL="http://localhost:8000/catalog.json"
 
 # Or use a staging catalog
@@ -415,11 +417,75 @@ export SPECKIT_CATALOG_URL="https://example.com/staging/catalog.json"
 
 ---
 
+## Extension Catalogs
+
+Spec Kit uses a **catalog stack** — an ordered list of catalogs searched simultaneously. By default, two catalogs are active:
+
+| Priority | Catalog | Install Allowed | Purpose |
+|----------|---------|-----------------|---------|
+| 1 | `catalog.json` (org-approved) | ✅ Yes | Extensions your org approves for installation |
+| 2 | `catalog.community.json` (community) | ❌ No (discovery only) | Browse community extensions |
+
+### Listing Active Catalogs
+
+```bash
+specify extension catalogs
+```
+
+### Adding a Catalog (Project-scoped)
+
+```bash
+# Add an internal catalog that allows installs
+specify extension catalog add \
+  --name "internal" \
+  --priority 2 \
+  --install-allowed \
+  https://internal.company.com/spec-kit/catalog.json
+
+# Add a discovery-only catalog
+specify extension catalog add \
+  --name "partner" \
+  --priority 5 \
+  https://partner.example.com/spec-kit/catalog.json
+```
+
+This creates or updates `.specify/extension-catalogs.yml`.
+
+### Removing a Catalog
+
+```bash
+specify extension catalog remove internal
+```
+
+### Manual Config File
+
+You can also edit `.specify/extension-catalogs.yml` directly:
+
+```yaml
+catalogs:
+  - name: "org-approved"
+    url: "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.json"
+    priority: 1
+    install_allowed: true
+
+  - name: "internal"
+    url: "https://internal.company.com/spec-kit/catalog.json"
+    priority: 2
+    install_allowed: true
+
+  - name: "community"
+    url: "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json"
+    priority: 3
+    install_allowed: false
+```
+
+A user-level equivalent lives at `~/.specify/extension-catalogs.yml`. Project-level config takes full precedence when present.
+
 ## Organization Catalog Customization
 
-### Why the Default Catalog is Empty
+### Why Customize Your Catalog
 
-The default spec-kit catalog ships empty by design. This allows organizations to:
+Organizations customize their catalogs to:
 
 - **Control available extensions** - Curate which extensions your team can install
 - **Host private extensions** - Internal tools that shouldn't be public
@@ -497,24 +563,40 @@ Options for hosting your catalog:
 
 #### 3. Configure Your Environment
 
-##### Option A: Environment variable (recommended for CI/CD)
+##### Option A: Catalog stack config file (recommended)
+
+Add to `.specify/extension-catalogs.yml` in your project:
+
+```yaml
+catalogs:
+  - name: "org-approved"
+    url: "https://your-org.com/spec-kit/catalog.json"
+    priority: 1
+    install_allowed: true
+```
+
+Or use the CLI:
+
+```bash
+specify extension catalog add \
+  --name "org-approved" \
+  --install-allowed \
+  https://your-org.com/spec-kit/catalog.json
+```
+
+##### Option B: Environment variable (recommended for CI/CD, single-catalog)
 
 ```bash
 # In ~/.bashrc, ~/.zshrc, or CI pipeline
 export SPECKIT_CATALOG_URL="https://your-org.com/spec-kit/catalog.json"
 ```
 
-##### Option B: Per-project configuration
-
-Create `.env` or set in your shell before running spec-kit commands:
-
-```bash
-SPECKIT_CATALOG_URL="https://your-org.com/spec-kit/catalog.json" specify extension search
-```
-
 #### 4. Verify Configuration
 
 ```bash
+# List active catalogs
+specify extension catalogs
+
 # Search should now show your catalog's extensions
 specify extension search
 

extensions/README.md

@@ -1,8 +1,74 @@
-# Spec Kit Community Extensions
+# Spec Kit Extensions
 
-Community-contributed extensions for [Spec Kit](https://github.com/github/spec-kit).
+Extension system for [Spec Kit](https://github.com/github/spec-kit) - add new functionality without bloating the core framework.
 
-## Available Extensions
+## Extension Catalogs
+
+Spec Kit provides two catalog files with different purposes:
+
+### Your Catalog (`catalog.json`)
+
+- **Purpose**: Default upstream catalog of extensions used by the Spec Kit CLI
+- **Default State**: Empty by design in the upstream project - you or your organization populate a fork/copy with extensions you trust
+- **Location (upstream)**: `extensions/catalog.json` in the GitHub-hosted spec-kit repo
+- **CLI Default**: The `specify extension` commands use the upstream catalog URL by default, unless overridden
+- **Org Catalog**: Point `SPECKIT_CATALOG_URL` at your organization's fork or hosted catalog JSON to use it instead of the upstream default
+- **Customization**: Copy entries from the community catalog into your org catalog, or add your own extensions directly
+
+**Example override:**
+```bash
+# Override the default upstream catalog with your organization's catalog
+export SPECKIT_CATALOG_URL="https://your-org.com/spec-kit/catalog.json"
+specify extension search  # Now uses your organization's catalog instead of the upstream default
+```
+
+### Community Reference Catalog (`catalog.community.json`)
+
+- **Purpose**: Browse available community-contributed extensions
+- **Status**: Active - contains extensions submitted by the community
+- **Location**: `extensions/catalog.community.json`
+- **Usage**: Reference catalog for discovering available extensions
+- **Submission**: Open to community contributions via Pull Request
+
+**How It Works:**
+
+## Making Extensions Available
+
+You control which extensions your team can discover and install:
+
+### Option 1: Curated Catalog (Recommended for Organizations)
+
+Populate your `catalog.json` with approved extensions:
+
+1. **Discover** extensions from various sources:
+   - Browse `catalog.community.json` for community extensions
+   - Find private/internal extensions in your organization's repos
+   - Discover extensions from trusted third parties
+2. **Review** extensions and choose which ones you want to make available
+3. **Add** those extension entries to your own `catalog.json`
+4. **Team members** can now discover and install them:
+   - `specify extension search` shows your curated catalog
+   - `specify extension add <name>` installs from your catalog
+
+**Benefits**: Full control over available extensions, team consistency, organizational approval workflow
+
+**Example**: Copy an entry from `catalog.community.json` to your `catalog.json`, then your team can discover and install it by name.
+
+### Option 2: Direct URLs (For Ad-hoc Use)
+
+Skip catalog curation - team members install directly using URLs:
+
+```bash
+specify extension add --from https://github.com/org/spec-kit-ext/archive/refs/tags/v1.0.0.zip
+```
+
+**Benefits**: Quick for one-off testing or private extensions
+
+**Tradeoff**: Extensions installed this way won't appear in `specify extension search` for other team members unless you also add them to your `catalog.json`.
+
+## Available Community Extensions
+
+The following community-contributed extensions are available in [`catalog.community.json`](catalog.community.json):
 
 | Extension | Purpose | URL |
 |-----------|---------|-----|
@@ -11,4 +77,43 @@ Community-contributed extensions for [Spec Kit](https://github.com/github/spec-k
 
 ## Adding Your Extension
 
-See the [Extension Publishing Guide](EXTENSION-PUBLISHING-GUIDE.md) for instructions on how to submit your extension to the community catalog.
+### Submission Process
+
+To add your extension to the community catalog:
+
+1. **Prepare your extension** following the [Extension Development Guide](EXTENSION-DEVELOPMENT-GUIDE.md)
+2. **Create a GitHub release** for your extension
+3. **Submit a Pull Request** that:
+   - Adds your extension to `extensions/catalog.community.json`
+   - Updates this README with your extension in the Available Extensions table
+4. **Wait for review** - maintainers will review and merge if criteria are met
+
+See the [Extension Publishing Guide](EXTENSION-PUBLISHING-GUIDE.md) for detailed step-by-step instructions.
+
+### Submission Checklist
+
+Before submitting, ensure:
+
+- ✅ Valid `extension.yml` manifest
+- ✅ Complete README with installation and usage instructions
+- ✅ LICENSE file included
+- ✅ GitHub release created with semantic version (e.g., v1.0.0)
+- ✅ Extension tested on a real project
+- ✅ All commands working as documented
+
+## Installing Extensions
+Once extensions are available (either in your catalog or via direct URL), install them:
+
+```bash
+# From your curated catalog (by name)
+specify extension search                  # See what's in your catalog
+specify extension add <extension-name>    # Install by name
+
+# Direct from URL (bypasses catalog)
+specify extension add --from https://github.com/<org>/<repo>/archive/refs/tags/<version>.zip
+
+# List installed extensions
+specify extension list
+```
+
+For more information, see the [Extension User Guide](EXTENSION-USER-GUIDE.md).

extensions/RFC-EXTENSION-SYSTEM.md

@@ -858,11 +858,41 @@ def should_execute_hook(hook: dict, config: dict) -> bool:
 
 ## Extension Discovery & Catalog
 
-### Central Catalog
+### Dual Catalog System
+
+Spec Kit uses two catalog files with different purposes:
+
+#### User Catalog (`catalog.json`)
 
 **URL**: `https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.json`
 
-**Format**:
+- **Purpose**: Organization's curated catalog of approved extensions
+- **Default State**: Empty by design - users populate with extensions they trust
+- **Usage**: Primary catalog (priority 1, `install_allowed: true`) in the default stack
+- **Control**: Organizations maintain their own fork/version for their teams
+
+#### Community Reference Catalog (`catalog.community.json`)
+
+**URL**: `https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json`
+
+- **Purpose**: Reference catalog of available community-contributed extensions
+- **Verification**: Community extensions may have `verified: false` initially
+- **Status**: Active - open for community contributions
+- **Submission**: Via Pull Request following the Extension Publishing Guide
+- **Usage**: Secondary catalog (priority 2, `install_allowed: false`) in the default stack — discovery only
+
+**How It Works (default stack):**
+
+1. **Discover**: `specify extension search` searches both catalogs — community extensions appear automatically
+2. **Review**: Evaluate community extensions for security, quality, and organizational fit
+3. **Curate**: Copy approved entries from community catalog to your `catalog.json`, or add to `.specify/extension-catalogs.yml` with `install_allowed: true`
+4. **Install**: Use `specify extension add <name>` — only allowed from `install_allowed: true` catalogs
+
+This approach gives organizations full control over which extensions can be installed while still providing community discoverability out of the box.
+
+### Catalog Format
+
+**Format** (same for both catalogs):
 
 ```json
 {
@@ -931,24 +961,110 @@ specify extension info jira
 
 ### Custom Catalogs
 
-Organizations can host private catalogs:
+Spec Kit supports a **catalog stack** — an ordered list of catalogs that the CLI merges and searches across. This allows organizations to benefit from org-approved extensions, an internal catalog, and community discovery all at once.
 
-```bash
-# Add custom catalog
-specify extension add-catalog https://internal.company.com/spec-kit/catalog.json
+#### Catalog Stack Resolution
 
-# Set as default
-specify extension set-catalog --default https://internal.company.com/spec-kit/catalog.json
+The active catalog stack is resolved in this order (first match wins):
 
-# List catalogs
-specify extension catalogs
+1. **`SPECKIT_CATALOG_URL` environment variable** — single catalog replacing all defaults (backward compat)
+2. **Project-level `.specify/extension-catalogs.yml`** — full control for the project
+3. **User-level `~/.specify/extension-catalogs.yml`** — personal defaults
+4. **Built-in default stack** — `catalog.json` (install_allowed: true) + `catalog.community.json` (install_allowed: false)
+
+#### Default Built-in Stack
+
+When no config file exists, the CLI uses:
+
+| Priority | Catalog | install_allowed | Purpose |
+|----------|---------|-----------------|---------|
+| 1 | `catalog.json` (org-approved) | `true` | Extensions your org approves for installation |
+| 2 | `catalog.community.json` (community) | `false` | Discovery only — browse but not install |
+
+This means `specify extension search` surfaces community extensions out of the box, while `specify extension add` is still restricted to org-approved entries.
+
+#### `.specify/extension-catalogs.yml` Config File
+
+```yaml
+catalogs:
+  - name: "org-approved"
+    url: "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.json"
+    priority: 1          # Highest — only approved entries can be installed
+    install_allowed: true
+
+  - name: "internal"
+    url: "https://internal.company.com/spec-kit/catalog.json"
+    priority: 2
+    install_allowed: true
+
+  - name: "community"
+    url: "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json"
+    priority: 3          # Lowest — discovery only, not installable
+    install_allowed: false
 ```
 
-**Catalog priority**:
+A user-level equivalent lives at `~/.specify/extension-catalogs.yml`. When a project-level config is present, it takes full control and the built-in defaults are not applied.
 
-1. Project-specific catalog (`.specify/extension-catalogs.yml`)
-2. User-level catalog (`~/.specify/extension-catalogs.yml`)
-3. Default GitHub catalog
+#### Catalog CLI Commands
+
+```bash
+# List active catalogs with name, URL, priority, and install_allowed
+specify extension catalogs
+
+# Add a catalog (project-scoped)
+specify extension catalog add --name "internal" --install-allowed \
+  https://internal.company.com/spec-kit/catalog.json
+
+# Add a discovery-only catalog
+specify extension catalog add --name "community" \
+  https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json
+
+# Remove a catalog
+specify extension catalog remove internal
+
+# Show which catalog an extension came from
+specify extension info jira
+# → Source catalog: org-approved
+```
+
+#### Merge Conflict Resolution
+
+When the same extension `id` appears in multiple catalogs, the higher-priority (lower priority number) catalog wins. Extensions from lower-priority catalogs with the same `id` are ignored.
+
+#### `install_allowed: false` Behavior
+
+Extensions from discovery-only catalogs are shown in `specify extension search` results but cannot be installed directly:
+
+```
+⚠  'linear' is available in the 'community' catalog but installation is not allowed from that catalog.
+
+To enable installation, add 'linear' to an approved catalog (install_allowed: true) in .specify/extension-catalogs.yml.
+```
+
+#### `SPECKIT_CATALOG_URL` (Backward Compatibility)
+
+The `SPECKIT_CATALOG_URL` environment variable still works — it is treated as a single `install_allowed: true` catalog, **replacing both defaults** for full backward compatibility:
+
+```bash
+# Point to your organization's catalog
+export SPECKIT_CATALOG_URL="https://internal.company.com/spec-kit/catalog.json"
+
+# All extension commands now use your custom catalog
+specify extension search       # Uses custom catalog
+specify extension add jira     # Installs from custom catalog
+```
+
+**Requirements:**
+- URL must use HTTPS (HTTP only allowed for localhost testing)
+- Catalog must follow the standard catalog.json schema
+- Must be publicly accessible or accessible within your network
+
+**Example for testing:**
+```bash
+# Test with localhost during development
+export SPECKIT_CATALOG_URL="http://localhost:8000/catalog.json"
+specify extension search
+```
 
 ---
 

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "specify-cli"
-version = "0.1.6"
+version = "0.1.7"
 description = "Specify CLI, part of GitHub Spec Kit. A tool to bootstrap your projects for Spec-Driven Development (SDD)."
 requires-python = ">=3.11"
 dependencies = [

scripts/bash/update-agent-context.sh

@@ -351,10 +351,19 @@ create_new_agent_file() {
     # Convert \n sequences to actual newlines
     newline=$(printf '\n')
     sed -i.bak2 "s/\\\\n/${newline}/g" "$temp_file"
-    
+
     # Clean up backup files
     rm -f "$temp_file.bak" "$temp_file.bak2"
-    
+
+    # Prepend Cursor frontmatter for .mdc files so rules are auto-included
+    if [[ "$target_file" == *.mdc ]]; then
+        local frontmatter_file
+        frontmatter_file=$(mktemp) || return 1
+        printf '%s\n' "---" "description: Project Development Guidelines" "globs: [\"**/*\"]" "alwaysApply: true" "---" "" > "$frontmatter_file"
+        cat "$temp_file" >> "$frontmatter_file"
+        mv "$frontmatter_file" "$temp_file"
+    fi
+
     return 0
 }
 
@@ -492,13 +501,24 @@ update_existing_agent_file() {
         changes_entries_added=true
     fi
     
+    # Ensure Cursor .mdc files have YAML frontmatter for auto-inclusion
+    if [[ "$target_file" == *.mdc ]]; then
+        if ! head -1 "$temp_file" | grep -q '^---'; then
+            local frontmatter_file
+            frontmatter_file=$(mktemp) || { rm -f "$temp_file"; return 1; }
+            printf '%s\n' "---" "description: Project Development Guidelines" "globs: [\"**/*\"]" "alwaysApply: true" "---" "" > "$frontmatter_file"
+            cat "$temp_file" >> "$frontmatter_file"
+            mv "$frontmatter_file" "$temp_file"
+        fi
+    fi
+
     # Move temp file to target atomically
     if ! mv "$temp_file" "$target_file"; then
         log_error "Failed to update target file"
         rm -f "$temp_file"
         return 1
     fi
-    
+
     return 0
 }
 #==============================================================================

scripts/powershell/update-agent-context.ps1

@@ -258,6 +258,12 @@ function New-AgentFile {
     # Convert literal \n sequences introduced by Escape to real newlines
     $content = $content -replace '\\n',[Environment]::NewLine
 
+    # Prepend Cursor frontmatter for .mdc files so rules are auto-included
+    if ($TargetFile -match '\.mdc$') {
+        $frontmatter = @('---','description: Project Development Guidelines','globs: ["**/*"]','alwaysApply: true','---','') -join [Environment]::NewLine
+        $content = $frontmatter + $content
+    }
+
     $parent = Split-Path -Parent $TargetFile
     if (-not (Test-Path $parent)) { New-Item -ItemType Directory -Path $parent | Out-Null }
     Set-Content -LiteralPath $TargetFile -Value $content -NoNewline -Encoding utf8
@@ -334,6 +340,12 @@ function Update-ExistingAgentFile {
         $newTechEntries | ForEach-Object { $output.Add($_) }
     }
 
+    # Ensure Cursor .mdc files have YAML frontmatter for auto-inclusion
+    if ($TargetFile -match '\.mdc$' -and $output.Count -gt 0 -and $output[0] -ne '---') {
+        $frontmatter = @('---','description: Project Development Guidelines','globs: ["**/*"]','alwaysApply: true','---','')
+        $output.InsertRange(0, $frontmatter)
+    }
+
     Set-Content -LiteralPath $TargetFile -Value ($output -join [Environment]::NewLine) -Encoding utf8
     return $true
 }

src/specify_cli/__init__.py

@@ -1720,6 +1720,13 @@ extension_app = typer.Typer(
 )
 app.add_typer(extension_app, name="extension")
 
+catalog_app = typer.Typer(
+    name="catalog",
+    help="Manage extension catalogs",
+    add_completion=False,
+)
+extension_app.add_typer(catalog_app, name="catalog")
+
 
 def get_speckit_version() -> str:
     """Get current spec-kit version."""
@@ -1785,6 +1792,157 @@ def extension_list(
         console.print("  [cyan]specify extension add <name>[/cyan]")
 
 
+@extension_app.command("catalogs")
+def extension_catalogs():
+    """List all active extension catalogs."""
+    from .extensions import ExtensionCatalog, ValidationError
+
+    project_root = Path.cwd()
+
+    specify_dir = project_root / ".specify"
+    if not specify_dir.exists():
+        console.print("[red]Error:[/red] Not a spec-kit project (no .specify/ directory)")
+        console.print("Run this command from a spec-kit project root")
+        raise typer.Exit(1)
+
+    catalog = ExtensionCatalog(project_root)
+
+    try:
+        active_catalogs = catalog.get_active_catalogs()
+    except ValidationError as e:
+        console.print(f"[red]Error:[/red] {e}")
+        raise typer.Exit(1)
+
+    console.print("\n[bold cyan]Active Extension Catalogs:[/bold cyan]\n")
+    for entry in active_catalogs:
+        install_str = (
+            "[green]install allowed[/green]"
+            if entry.install_allowed
+            else "[yellow]discovery only[/yellow]"
+        )
+        console.print(f"  [bold]{entry.name}[/bold] (priority {entry.priority})")
+        console.print(f"     URL: {entry.url}")
+        console.print(f"     Install: {install_str}")
+        console.print()
+
+    config_path = project_root / ".specify" / "extension-catalogs.yml"
+    if config_path.exists() and catalog._load_catalog_config(config_path) is not None:
+        console.print(f"[dim]Config: {config_path.relative_to(project_root)}[/dim]")
+    elif os.environ.get("SPECKIT_CATALOG_URL"):
+        console.print("[dim]Catalog configured via SPECKIT_CATALOG_URL environment variable.[/dim]")
+    else:
+        console.print("[dim]Using built-in default catalog stack.[/dim]")
+        console.print(
+            "[dim]Add .specify/extension-catalogs.yml to customize.[/dim]"
+        )
+
+
+@catalog_app.command("add")
+def catalog_add(
+    url: str = typer.Argument(help="Catalog URL (must use HTTPS)"),
+    name: str = typer.Option(..., "--name", help="Catalog name"),
+    priority: int = typer.Option(10, "--priority", help="Priority (lower = higher priority)"),
+    install_allowed: bool = typer.Option(
+        False, "--install-allowed/--no-install-allowed",
+        help="Allow extensions from this catalog to be installed",
+    ),
+):
+    """Add a catalog to .specify/extension-catalogs.yml."""
+    from .extensions import ExtensionCatalog, ValidationError
+
+    project_root = Path.cwd()
+
+    specify_dir = project_root / ".specify"
+    if not specify_dir.exists():
+        console.print("[red]Error:[/red] Not a spec-kit project (no .specify/ directory)")
+        console.print("Run this command from a spec-kit project root")
+        raise typer.Exit(1)
+
+    # Validate URL
+    tmp_catalog = ExtensionCatalog(project_root)
+    try:
+        tmp_catalog._validate_catalog_url(url)
+    except ValidationError as e:
+        console.print(f"[red]Error:[/red] {e}")
+        raise typer.Exit(1)
+
+    config_path = specify_dir / "extension-catalogs.yml"
+
+    # Load existing config
+    if config_path.exists():
+        try:
+            config = yaml.safe_load(config_path.read_text()) or {}
+        except Exception:
+            config = {}
+    else:
+        config = {}
+
+    catalogs = config.get("catalogs", [])
+
+    # Check for duplicate name
+    for existing in catalogs:
+        if existing.get("name") == name:
+            console.print(f"[yellow]Warning:[/yellow] A catalog named '{name}' already exists.")
+            console.print("Use 'specify extension catalog remove' first, or choose a different name.")
+            raise typer.Exit(1)
+
+    catalogs.append({
+        "name": name,
+        "url": url,
+        "priority": priority,
+        "install_allowed": install_allowed,
+    })
+
+    config["catalogs"] = catalogs
+    config_path.write_text(yaml.dump(config, default_flow_style=False, sort_keys=False))
+
+    install_label = "install allowed" if install_allowed else "discovery only"
+    console.print(f"\n[green]✓[/green] Added catalog '[bold]{name}[/bold]' ({install_label})")
+    console.print(f"  URL: {url}")
+    console.print(f"  Priority: {priority}")
+    console.print(f"\nConfig saved to {config_path.relative_to(project_root)}")
+
+
+@catalog_app.command("remove")
+def catalog_remove(
+    name: str = typer.Argument(help="Catalog name to remove"),
+):
+    """Remove a catalog from .specify/extension-catalogs.yml."""
+    project_root = Path.cwd()
+
+    specify_dir = project_root / ".specify"
+    if not specify_dir.exists():
+        console.print("[red]Error:[/red] Not a spec-kit project (no .specify/ directory)")
+        console.print("Run this command from a spec-kit project root")
+        raise typer.Exit(1)
+
+    config_path = specify_dir / "extension-catalogs.yml"
+    if not config_path.exists():
+        console.print("[red]Error:[/red] No catalog config found. Nothing to remove.")
+        raise typer.Exit(1)
+
+    try:
+        config = yaml.safe_load(config_path.read_text()) or {}
+    except Exception:
+        console.print("[red]Error:[/red] Failed to read catalog config.")
+        raise typer.Exit(1)
+
+    catalogs = config.get("catalogs", [])
+    original_count = len(catalogs)
+    catalogs = [c for c in catalogs if c.get("name") != name]
+
+    if len(catalogs) == original_count:
+        console.print(f"[red]Error:[/red] Catalog '{name}' not found.")
+        raise typer.Exit(1)
+
+    config["catalogs"] = catalogs
+    config_path.write_text(yaml.dump(config, default_flow_style=False, sort_keys=False))
+
+    console.print(f"[green]✓[/green] Removed catalog '{name}'")
+    if not catalogs:
+        console.print("\n[dim]No catalogs remain in config. Built-in defaults will be used.[/dim]")
+
+
 @extension_app.command("add")
 def extension_add(
     extension: str = typer.Argument(help="Extension name or path"),
@@ -1873,6 +2031,19 @@ def extension_add(
                     console.print("  specify extension search")
                     raise typer.Exit(1)
 
+                # Enforce install_allowed policy
+                if not ext_info.get("_install_allowed", True):
+                    catalog_name = ext_info.get("_catalog_name", "community")
+                    console.print(
+                        f"[red]Error:[/red] '{extension}' is available in the "
+                        f"'{catalog_name}' catalog but installation is not allowed from that catalog."
+                    )
+                    console.print(
+                        f"\nTo enable installation, add '{extension}' to an approved catalog "
+                        f"(install_allowed: true) in .specify/extension-catalogs.yml."
+                    )
+                    raise typer.Exit(1)
+
                 # Download extension ZIP
                 console.print(f"Downloading {ext_info['name']} v{ext_info.get('version', 'unknown')}...")
                 zip_path = catalog.download_extension(extension)
@@ -2017,6 +2188,15 @@ def extension_search(
                 tags_str = ", ".join(ext['tags'])
                 console.print(f"  [dim]Tags:[/dim] {tags_str}")
 
+            # Source catalog
+            catalog_name = ext.get("_catalog_name", "")
+            install_allowed = ext.get("_install_allowed", True)
+            if catalog_name:
+                if install_allowed:
+                    console.print(f"  [dim]Catalog:[/dim] {catalog_name}")
+                else:
+                    console.print(f"  [dim]Catalog:[/dim] {catalog_name} [yellow](discovery only — not installable)[/yellow]")
+
             # Stats
             stats = []
             if ext.get('downloads') is not None:
@@ -2030,8 +2210,15 @@ def extension_search(
             if ext.get('repository'):
                 console.print(f"  [dim]Repository:[/dim] {ext['repository']}")
 
-            # Install command
-            console.print(f"\n  [cyan]Install:[/cyan] specify extension add {ext['id']}")
+            # Install command (show warning if not installable)
+            if install_allowed:
+                console.print(f"\n  [cyan]Install:[/cyan] specify extension add {ext['id']}")
+            else:
+                console.print(f"\n  [yellow]⚠[/yellow]  Not directly installable from '{catalog_name}'.")
+                console.print(
+                    "  Add to an approved catalog with install_allowed: true, "
+                    "or use: specify extension add --from <url>"
+                )
             console.print()
 
     except ExtensionError as e:
@@ -2080,6 +2267,12 @@ def extension_info(
         # Author and License
         console.print(f"[dim]Author:[/dim] {ext_info.get('author', 'Unknown')}")
         console.print(f"[dim]License:[/dim] {ext_info.get('license', 'Unknown')}")
+
+        # Source catalog
+        if ext_info.get("_catalog_name"):
+            install_allowed = ext_info.get("_install_allowed", True)
+            install_note = "" if install_allowed else " [yellow](discovery only)[/yellow]"
+            console.print(f"[dim]Source catalog:[/dim] {ext_info['_catalog_name']}{install_note}")
         console.print()
 
         # Requirements
@@ -2136,12 +2329,21 @@ def extension_info(
 
         # Installation status and command
         is_installed = manager.registry.is_installed(ext_info['id'])
+        install_allowed = ext_info.get("_install_allowed", True)
         if is_installed:
             console.print("[green]✓ Installed[/green]")
             console.print(f"\nTo remove: specify extension remove {ext_info['id']}")
-        else:
+        elif install_allowed:
             console.print("[yellow]Not installed[/yellow]")
             console.print(f"\n[cyan]Install:[/cyan] specify extension add {ext_info['id']}")
+        else:
+            catalog_name = ext_info.get("_catalog_name", "community")
+            console.print("[yellow]Not installed[/yellow]")
+            console.print(
+                f"\n[yellow]⚠[/yellow]  '{ext_info['id']}' is available in the '{catalog_name}' catalog "
+                f"but not in your approved catalog. Add it to .specify/extension-catalogs.yml "
+                f"with install_allowed: true to enable installation."
+            )
 
     except ExtensionError as e:
         console.print(f"\n[red]Error:[/red] {e}")

src/specify_cli/extensions.py

@@ -8,9 +8,11 @@ without bloating the core framework.
 
 import json
 import hashlib
+import os
 import tempfile
 import zipfile
 import shutil
+from dataclasses import dataclass
 from pathlib import Path
 from typing import Optional, Dict, List, Any
 from datetime import datetime, timezone
@@ -36,6 +38,15 @@ class CompatibilityError(ExtensionError):
     pass
 
 
+@dataclass
+class CatalogEntry:
+    """Represents a single catalog entry in the catalog stack."""
+    url: str
+    name: str
+    priority: int
+    install_allowed: bool
+
+
 class ExtensionManifest:
     """Represents and validates an extension manifest (extension.yml)."""
 
@@ -940,6 +951,7 @@ class ExtensionCatalog:
     """Manages extension catalog fetching, caching, and searching."""
 
     DEFAULT_CATALOG_URL = "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.json"
+    COMMUNITY_CATALOG_URL = "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json"
     CACHE_DURATION = 3600  # 1 hour in seconds
 
     def __init__(self, project_root: Path):
@@ -954,43 +966,82 @@ class ExtensionCatalog:
         self.cache_file = self.cache_dir / "catalog.json"
         self.cache_metadata_file = self.cache_dir / "catalog-metadata.json"
 
-    def get_catalog_url(self) -> str:
-        """Get catalog URL from config or use default.
+    def _validate_catalog_url(self, url: str) -> None:
+        """Validate that a catalog URL uses HTTPS (localhost HTTP allowed).
 
-        Checks in order:
-        1. SPECKIT_CATALOG_URL environment variable
-        2. Default catalog URL
-
-        Returns:
-            URL to fetch catalog from
+        Args:
+            url: URL to validate
 
         Raises:
-            ValidationError: If custom URL is invalid (non-HTTPS)
+            ValidationError: If URL is invalid or uses non-HTTPS scheme
         """
-        import os
-        import sys
         from urllib.parse import urlparse
 
-        # Environment variable override (useful for testing)
+        parsed = urlparse(url)
+        is_localhost = parsed.hostname in ("localhost", "127.0.0.1", "::1")
+        if parsed.scheme != "https" and not (parsed.scheme == "http" and is_localhost):
+            raise ValidationError(
+                f"Catalog URL must use HTTPS (got {parsed.scheme}://). "
+                "HTTP is only allowed for localhost."
+            )
+        if not parsed.netloc:
+            raise ValidationError("Catalog URL must be a valid URL with a host.")
+
+    def _load_catalog_config(self, config_path: Path) -> Optional[List[CatalogEntry]]:
+        """Load catalog stack configuration from a YAML file.
+
+        Args:
+            config_path: Path to extension-catalogs.yml
+
+        Returns:
+            Ordered list of CatalogEntry objects, or None if file doesn't exist
+            or contains no valid catalog entries.
+        """
+        if not config_path.exists():
+            return None
+        try:
+            data = yaml.safe_load(config_path.read_text()) or {}
+            catalogs_data = data.get("catalogs", [])
+            if not catalogs_data:
+                return None
+            entries: List[CatalogEntry] = []
+            for idx, item in enumerate(catalogs_data):
+                url = str(item.get("url", "")).strip()
+                if not url:
+                    continue
+                self._validate_catalog_url(url)
+                entries.append(CatalogEntry(
+                    url=url,
+                    name=str(item.get("name", f"catalog-{idx + 1}")),
+                    priority=int(item.get("priority", idx + 1)),
+                    install_allowed=bool(item.get("install_allowed", True)),
+                ))
+            entries.sort(key=lambda e: e.priority)
+            return entries if entries else None
+        except (yaml.YAMLError, OSError):
+            return None
+
+    def get_active_catalogs(self) -> List[CatalogEntry]:
+        """Get the ordered list of active catalogs.
+
+        Resolution order:
+        1. SPECKIT_CATALOG_URL env var — single catalog replacing all defaults
+        2. Project-level .specify/extension-catalogs.yml
+        3. User-level ~/.specify/extension-catalogs.yml
+        4. Built-in default stack (org-approved + community)
+
+        Returns:
+            List of CatalogEntry objects sorted by priority (ascending)
+
+        Raises:
+            ValidationError: If a catalog URL is invalid
+        """
+        import sys
+
+        # 1. SPECKIT_CATALOG_URL env var replaces all defaults for backward compat
         if env_value := os.environ.get("SPECKIT_CATALOG_URL"):
             catalog_url = env_value.strip()
-            parsed = urlparse(catalog_url)
-
-            # Require HTTPS for security (prevent man-in-the-middle attacks)
-            # Allow http://localhost for local development/testing
-            is_localhost = parsed.hostname in ("localhost", "127.0.0.1", "::1")
-            if parsed.scheme != "https" and not (parsed.scheme == "http" and is_localhost):
-                raise ValidationError(
-                    f"Invalid SPECKIT_CATALOG_URL: must use HTTPS (got {parsed.scheme}://). "
-                    "HTTP is only allowed for localhost."
-                )
-
-            if not parsed.netloc:
-                raise ValidationError(
-                    "Invalid SPECKIT_CATALOG_URL: must be a valid URL with a host."
-                )
-
-            # Warn users when using a non-default catalog (once per instance)
+            self._validate_catalog_url(catalog_url)
             if catalog_url != self.DEFAULT_CATALOG_URL:
                 if not getattr(self, "_non_default_catalog_warning_shown", False):
                     print(
@@ -999,11 +1050,161 @@ class ExtensionCatalog:
                         file=sys.stderr,
                     )
                     self._non_default_catalog_warning_shown = True
+            return [CatalogEntry(url=catalog_url, name="custom", priority=1, install_allowed=True)]
 
-            return catalog_url
+        # 2. Project-level config overrides all defaults
+        project_config_path = self.project_root / ".specify" / "extension-catalogs.yml"
+        catalogs = self._load_catalog_config(project_config_path)
+        if catalogs is not None:
+            return catalogs
 
-        # TODO: Support custom catalogs from .specify/extension-catalogs.yml
-        return self.DEFAULT_CATALOG_URL
+        # 3. User-level config
+        user_config_path = Path.home() / ".specify" / "extension-catalogs.yml"
+        catalogs = self._load_catalog_config(user_config_path)
+        if catalogs is not None:
+            return catalogs
+
+        # 4. Built-in default stack
+        return [
+            CatalogEntry(url=self.DEFAULT_CATALOG_URL, name="org-approved", priority=1, install_allowed=True),
+            CatalogEntry(url=self.COMMUNITY_CATALOG_URL, name="community", priority=2, install_allowed=False),
+        ]
+
+    def get_catalog_url(self) -> str:
+        """Get the primary catalog URL.
+
+        Returns the URL of the highest-priority catalog. Kept for backward
+        compatibility. Use get_active_catalogs() for full multi-catalog support.
+
+        Returns:
+            URL of the primary catalog
+
+        Raises:
+            ValidationError: If a catalog URL is invalid
+        """
+        active = self.get_active_catalogs()
+        return active[0].url if active else self.DEFAULT_CATALOG_URL
+
+    def _fetch_single_catalog(self, entry: CatalogEntry, force_refresh: bool = False) -> Dict[str, Any]:
+        """Fetch a single catalog with per-URL caching.
+
+        For the DEFAULT_CATALOG_URL, uses legacy cache files (self.cache_file /
+        self.cache_metadata_file) for backward compatibility. For all other URLs,
+        uses URL-hash-based cache files in self.cache_dir.
+
+        Args:
+            entry: CatalogEntry describing the catalog to fetch
+            force_refresh: If True, bypass cache
+
+        Returns:
+            Catalog data dictionary
+
+        Raises:
+            ExtensionError: If catalog cannot be fetched or has invalid format
+        """
+        import urllib.request
+        import urllib.error
+
+        # Determine cache file paths (backward compat for default catalog)
+        if entry.url == self.DEFAULT_CATALOG_URL:
+            cache_file = self.cache_file
+            cache_meta_file = self.cache_metadata_file
+            is_valid = not force_refresh and self.is_cache_valid()
+        else:
+            url_hash = hashlib.sha256(entry.url.encode()).hexdigest()[:16]
+            cache_file = self.cache_dir / f"catalog-{url_hash}.json"
+            cache_meta_file = self.cache_dir / f"catalog-{url_hash}-metadata.json"
+            is_valid = False
+            if not force_refresh and cache_file.exists() and cache_meta_file.exists():
+                try:
+                    metadata = json.loads(cache_meta_file.read_text())
+                    cached_at = datetime.fromisoformat(metadata.get("cached_at", ""))
+                    age = (datetime.now(timezone.utc) - cached_at).total_seconds()
+                    is_valid = age < self.CACHE_DURATION
+                except (json.JSONDecodeError, ValueError, KeyError):
+                    # If metadata is invalid or missing expected fields, treat cache as invalid
+                    pass
+
+        # Use cache if valid
+        if is_valid:
+            try:
+                return json.loads(cache_file.read_text())
+            except json.JSONDecodeError:
+                pass
+
+        # Fetch from network
+        try:
+            with urllib.request.urlopen(entry.url, timeout=10) as response:
+                catalog_data = json.loads(response.read())
+
+            if "schema_version" not in catalog_data or "extensions" not in catalog_data:
+                raise ExtensionError(f"Invalid catalog format from {entry.url}")
+
+            # Save to cache
+            self.cache_dir.mkdir(parents=True, exist_ok=True)
+            cache_file.write_text(json.dumps(catalog_data, indent=2))
+            cache_meta_file.write_text(json.dumps({
+                "cached_at": datetime.now(timezone.utc).isoformat(),
+                "catalog_url": entry.url,
+            }, indent=2))
+
+            return catalog_data
+
+        except urllib.error.URLError as e:
+            raise ExtensionError(f"Failed to fetch catalog from {entry.url}: {e}")
+        except json.JSONDecodeError as e:
+            raise ExtensionError(f"Invalid JSON in catalog from {entry.url}: {e}")
+
+    def _get_merged_extensions(self, force_refresh: bool = False) -> List[Dict[str, Any]]:
+        """Fetch and merge extensions from all active catalogs.
+
+        Higher-priority (lower priority number) catalogs win on conflicts
+        (same extension id in two catalogs). Each extension dict is annotated with:
+          - _catalog_name: name of the source catalog
+          - _install_allowed: whether installation is allowed from this catalog
+
+        Catalogs that fail to fetch are skipped. Raises ExtensionError only if
+        ALL catalogs fail.
+
+        Args:
+            force_refresh: If True, bypass all caches
+
+        Returns:
+            List of merged extension dicts
+
+        Raises:
+            ExtensionError: If all catalogs fail to fetch
+        """
+        import sys
+
+        active_catalogs = self.get_active_catalogs()
+        merged: Dict[str, Dict[str, Any]] = {}
+        any_success = False
+
+        for catalog_entry in active_catalogs:
+            try:
+                catalog_data = self._fetch_single_catalog(catalog_entry, force_refresh)
+                any_success = True
+            except ExtensionError as e:
+                print(
+                    f"Warning: Could not fetch catalog '{catalog_entry.name}': {e}",
+                    file=sys.stderr,
+                )
+                continue
+
+            for ext_id, ext_data in catalog_data.get("extensions", {}).items():
+                if ext_id not in merged:  # Higher-priority catalog wins
+                    merged[ext_id] = {
+                        "id": ext_id,
+                        **ext_data,
+                        "_catalog_name": catalog_entry.name,
+                        "_install_allowed": catalog_entry.install_allowed,
+                    }
+
+        if not any_success and active_catalogs:
+            raise ExtensionError("Failed to fetch any extension catalog")
+
+        return list(merged.values())
 
     def is_cache_valid(self) -> bool:
         """Check if cached catalog is still valid.
@@ -1080,7 +1281,7 @@ class ExtensionCatalog:
         author: Optional[str] = None,
         verified_only: bool = False,
     ) -> List[Dict[str, Any]]:
-        """Search catalog for extensions.
+        """Search catalog for extensions across all active catalogs.
 
         Args:
             query: Search query (searches name, description, tags)
@@ -1089,14 +1290,16 @@ class ExtensionCatalog:
             verified_only: If True, show only verified extensions
 
         Returns:
-            List of matching extension metadata
+            List of matching extension metadata, each annotated with
+            ``_catalog_name`` and ``_install_allowed`` from its source catalog.
         """
-        catalog = self.fetch_catalog()
-        extensions = catalog.get("extensions", {})
+        all_extensions = self._get_merged_extensions()
 
         results = []
 
-        for ext_id, ext_data in extensions.items():
+        for ext_data in all_extensions:
+            ext_id = ext_data["id"]
+
             # Apply filters
             if verified_only and not ext_data.get("verified", False):
                 continue
@@ -1122,25 +1325,26 @@ class ExtensionCatalog:
                 if query_lower not in searchable_text:
                     continue
 
-            results.append({"id": ext_id, **ext_data})
+            results.append(ext_data)
 
         return results
 
     def get_extension_info(self, extension_id: str) -> Optional[Dict[str, Any]]:
         """Get detailed information about a specific extension.
 
+        Searches all active catalogs in priority order.
+
         Args:
             extension_id: ID of the extension
 
         Returns:
-            Extension metadata or None if not found
+            Extension metadata (annotated with ``_catalog_name`` and
+            ``_install_allowed``) or None if not found.
         """
-        catalog = self.fetch_catalog()
-        extensions = catalog.get("extensions", {})
-
-        if extension_id in extensions:
-            return {"id": extension_id, **extensions[extension_id]}
-
+        all_extensions = self._get_merged_extensions()
+        for ext_data in all_extensions:
+            if ext_data["id"] == extension_id:
+                return ext_data
         return None
 
     def download_extension(self, extension_id: str, target_dir: Optional[Path] = None) -> Path:
@@ -1200,11 +1404,18 @@ class ExtensionCatalog:
             raise ExtensionError(f"Failed to save extension ZIP: {e}")
 
     def clear_cache(self):
-        """Clear the catalog cache."""
+        """Clear the catalog cache (both legacy and URL-hash-based files)."""
         if self.cache_file.exists():
             self.cache_file.unlink()
         if self.cache_metadata_file.exists():
             self.cache_metadata_file.unlink()
+        # Also clear any per-URL hash-based cache files
+        if self.cache_dir.exists():
+            for extra_cache in self.cache_dir.glob("catalog-*.json"):
+                if extra_cache != self.cache_file:
+                    extra_cache.unlink(missing_ok=True)
+            for extra_meta in self.cache_dir.glob("catalog-*-metadata.json"):
+                extra_meta.unlink(missing_ok=True)
 
 
 class ConfigManager:

tests/test_cursor_frontmatter.py

@@ -0,0 +1,263 @@
+"""
+Tests for Cursor .mdc frontmatter generation (issue #669).
+
+Verifies that update-agent-context.sh properly prepends YAML frontmatter
+to .mdc files so that Cursor IDE auto-includes the rules.
+"""
+
+import os
+import shutil
+import subprocess
+import textwrap
+
+import pytest
+
+SCRIPT_PATH = os.path.join(
+    os.path.dirname(__file__),
+    os.pardir,
+    "scripts",
+    "bash",
+    "update-agent-context.sh",
+)
+
+EXPECTED_FRONTMATTER_LINES = [
+    "---",
+    "description: Project Development Guidelines",
+    'globs: ["**/*"]',
+    "alwaysApply: true",
+    "---",
+]
+
+requires_git = pytest.mark.skipif(
+    shutil.which("git") is None,
+    reason="git is not installed",
+)
+
+
+class TestScriptFrontmatterPattern:
+    """Static analysis — no git required."""
+
+    def test_create_new_has_mdc_frontmatter_logic(self):
+        """create_new_agent_file() must contain .mdc frontmatter logic."""
+        with open(SCRIPT_PATH, encoding="utf-8") as f:
+            content = f.read()
+        assert 'if [[ "$target_file" == *.mdc ]]' in content
+        assert "alwaysApply: true" in content
+
+    def test_update_existing_has_mdc_frontmatter_logic(self):
+        """update_existing_agent_file() must also handle .mdc frontmatter."""
+        with open(SCRIPT_PATH, encoding="utf-8") as f:
+            content = f.read()
+        # There should be two occurrences of the .mdc check — one per function
+        occurrences = content.count('if [[ "$target_file" == *.mdc ]]')
+        assert occurrences >= 2, (
+            f"Expected at least 2 .mdc frontmatter checks, found {occurrences}"
+        )
+
+    def test_powershell_script_has_mdc_frontmatter_logic(self):
+        """PowerShell script must also handle .mdc frontmatter."""
+        ps_path = os.path.join(
+            os.path.dirname(__file__),
+            os.pardir,
+            "scripts",
+            "powershell",
+            "update-agent-context.ps1",
+        )
+        with open(ps_path, encoding="utf-8") as f:
+            content = f.read()
+        assert "alwaysApply: true" in content
+        occurrences = content.count(r"\.mdc$")
+        assert occurrences >= 2, (
+            f"Expected at least 2 .mdc frontmatter checks in PS script, found {occurrences}"
+        )
+
+
+@requires_git
+class TestCursorFrontmatterIntegration:
+    """Integration tests using a real git repo."""
+
+    @pytest.fixture
+    def git_repo(self, tmp_path):
+        """Create a minimal git repo with the spec-kit structure."""
+        repo = tmp_path / "repo"
+        repo.mkdir()
+
+        # Init git repo
+        subprocess.run(
+            ["git", "init"], cwd=str(repo), capture_output=True, check=True
+        )
+        subprocess.run(
+            ["git", "config", "user.email", "test@test.com"],
+            cwd=str(repo),
+            capture_output=True,
+            check=True,
+        )
+        subprocess.run(
+            ["git", "config", "user.name", "Test"],
+            cwd=str(repo),
+            capture_output=True,
+            check=True,
+        )
+
+        # Create .specify dir with config
+        specify_dir = repo / ".specify"
+        specify_dir.mkdir()
+        (specify_dir / "config.yaml").write_text(
+            textwrap.dedent("""\
+                project_type: webapp
+                language: python
+                framework: fastapi
+                database: N/A
+            """)
+        )
+
+        # Create template
+        templates_dir = specify_dir / "templates"
+        templates_dir.mkdir()
+        (templates_dir / "agent-file-template.md").write_text(
+            "# [PROJECT NAME] Development Guidelines\n\n"
+            "Auto-generated from all feature plans. Last updated: [DATE]\n\n"
+            "## Active Technologies\n\n"
+            "[EXTRACTED FROM ALL PLAN.MD FILES]\n\n"
+            "## Project Structure\n\n"
+            "[ACTUAL STRUCTURE FROM PLANS]\n\n"
+            "## Development Commands\n\n"
+            "[ONLY COMMANDS FOR ACTIVE TECHNOLOGIES]\n\n"
+            "## Coding Conventions\n\n"
+            "[LANGUAGE-SPECIFIC, ONLY FOR LANGUAGES IN USE]\n\n"
+            "## Recent Changes\n\n"
+            "[LAST 3 FEATURES AND WHAT THEY ADDED]\n"
+        )
+
+        # Create initial commit
+        subprocess.run(
+            ["git", "add", "-A"], cwd=str(repo), capture_output=True, check=True
+        )
+        subprocess.run(
+            ["git", "commit", "-m", "init"],
+            cwd=str(repo),
+            capture_output=True,
+            check=True,
+        )
+
+        # Create a feature branch so CURRENT_BRANCH detection works
+        subprocess.run(
+            ["git", "checkout", "-b", "001-test-feature"],
+            cwd=str(repo),
+            capture_output=True,
+            check=True,
+        )
+
+        # Create a spec so the script detects the feature
+        spec_dir = repo / "specs" / "001-test-feature"
+        spec_dir.mkdir(parents=True)
+        (spec_dir / "plan.md").write_text(
+            "# Test Feature Plan\n\n"
+            "## Technology Stack\n\n"
+            "- Language: Python\n"
+            "- Framework: FastAPI\n"
+        )
+
+        return repo
+
+    def _run_update(self, repo, agent_type="cursor-agent"):
+        """Run update-agent-context.sh for a specific agent type."""
+        script = os.path.abspath(SCRIPT_PATH)
+        result = subprocess.run(
+            ["bash", script, agent_type],
+            cwd=str(repo),
+            capture_output=True,
+            text=True,
+            timeout=30,
+        )
+        return result
+
+    def test_new_mdc_file_has_frontmatter(self, git_repo):
+        """Creating a new .mdc file must include YAML frontmatter."""
+        result = self._run_update(git_repo)
+        assert result.returncode == 0, f"Script failed: {result.stderr}"
+
+        mdc_file = git_repo / ".cursor" / "rules" / "specify-rules.mdc"
+        assert mdc_file.exists(), "Cursor .mdc file was not created"
+
+        content = mdc_file.read_text()
+        lines = content.splitlines()
+
+        # First line must be the opening ---
+        assert lines[0] == "---", f"Expected frontmatter start, got: {lines[0]}"
+
+        # Check all frontmatter lines are present
+        for expected in EXPECTED_FRONTMATTER_LINES:
+            assert expected in content, f"Missing frontmatter line: {expected}"
+
+        # Content after frontmatter should be the template content
+        assert "Development Guidelines" in content
+
+    def test_existing_mdc_without_frontmatter_gets_it_added(self, git_repo):
+        """Updating an existing .mdc file that lacks frontmatter must add it."""
+        # First, create the file WITHOUT frontmatter (simulating pre-fix state)
+        cursor_dir = git_repo / ".cursor" / "rules"
+        cursor_dir.mkdir(parents=True, exist_ok=True)
+        mdc_file = cursor_dir / "specify-rules.mdc"
+        mdc_file.write_text(
+            "# repo Development Guidelines\n\n"
+            "Auto-generated from all feature plans. Last updated: 2025-01-01\n\n"
+            "## Active Technologies\n\n"
+            "- Python + FastAPI (main)\n\n"
+            "## Recent Changes\n\n"
+            "- main: Added Python + FastAPI\n"
+        )
+
+        result = self._run_update(git_repo)
+        assert result.returncode == 0, f"Script failed: {result.stderr}"
+
+        content = mdc_file.read_text()
+        lines = content.splitlines()
+
+        assert lines[0] == "---", f"Expected frontmatter start, got: {lines[0]}"
+        for expected in EXPECTED_FRONTMATTER_LINES:
+            assert expected in content, f"Missing frontmatter line: {expected}"
+
+    def test_existing_mdc_with_frontmatter_not_duplicated(self, git_repo):
+        """Updating an .mdc file that already has frontmatter must not duplicate it."""
+        cursor_dir = git_repo / ".cursor" / "rules"
+        cursor_dir.mkdir(parents=True, exist_ok=True)
+        mdc_file = cursor_dir / "specify-rules.mdc"
+
+        frontmatter = (
+            "---\n"
+            "description: Project Development Guidelines\n"
+            'globs: ["**/*"]\n'
+            "alwaysApply: true\n"
+            "---\n\n"
+        )
+        body = (
+            "# repo Development Guidelines\n\n"
+            "Auto-generated from all feature plans. Last updated: 2025-01-01\n\n"
+            "## Active Technologies\n\n"
+            "- Python + FastAPI (main)\n\n"
+            "## Recent Changes\n\n"
+            "- main: Added Python + FastAPI\n"
+        )
+        mdc_file.write_text(frontmatter + body)
+
+        result = self._run_update(git_repo)
+        assert result.returncode == 0, f"Script failed: {result.stderr}"
+
+        content = mdc_file.read_text()
+        # Count occurrences of the frontmatter delimiter
+        assert content.count("alwaysApply: true") == 1, (
+            "Frontmatter was duplicated"
+        )
+
+    def test_non_mdc_file_has_no_frontmatter(self, git_repo):
+        """Non-.mdc agent files (e.g., Claude) must NOT get frontmatter."""
+        result = self._run_update(git_repo, agent_type="claude")
+        assert result.returncode == 0, f"Script failed: {result.stderr}"
+
+        claude_file = git_repo / ".claude" / "CLAUDE.md"
+        if claude_file.exists():
+            content = claude_file.read_text()
+            assert not content.startswith("---"), (
+                "Non-mdc file should not have frontmatter"
+            )

tests/test_extensions.py

@@ -6,6 +6,7 @@ Tests cover:
 - Extension registry operations
 - Extension manager installation/removal
 - Command registration
+- Catalog stack (multi-catalog support)
 """
 
 import pytest
@@ -16,6 +17,7 @@ from pathlib import Path
 from datetime import datetime, timezone
 
 from specify_cli.extensions import (
+    CatalogEntry,
     ExtensionManifest,
     ExtensionRegistry,
     ExtensionManager,
@@ -734,10 +736,29 @@ class TestExtensionCatalog:
 
     def test_search_all_extensions(self, temp_dir):
         """Test searching all extensions without filters."""
+        import yaml as yaml_module
+
         project_dir = temp_dir / "project"
         project_dir.mkdir()
         (project_dir / ".specify").mkdir()
 
+        # Use a single-catalog config so community extensions don't interfere
+        config_path = project_dir / ".specify" / "extension-catalogs.yml"
+        with open(config_path, "w") as f:
+            yaml_module.dump(
+                {
+                    "catalogs": [
+                        {
+                            "name": "test-catalog",
+                            "url": ExtensionCatalog.DEFAULT_CATALOG_URL,
+                            "priority": 1,
+                            "install_allowed": True,
+                        }
+                    ]
+                },
+                f,
+            )
+
         catalog = ExtensionCatalog(project_dir)
 
         # Create mock catalog
@@ -987,3 +1008,373 @@ class TestExtensionCatalog:
 
         assert not catalog.cache_file.exists()
         assert not catalog.cache_metadata_file.exists()
+
+
+# ===== CatalogEntry Tests =====
+
+class TestCatalogEntry:
+    """Test CatalogEntry dataclass."""
+
+    def test_catalog_entry_creation(self):
+        """Test creating a CatalogEntry."""
+        entry = CatalogEntry(
+            url="https://example.com/catalog.json",
+            name="test",
+            priority=1,
+            install_allowed=True,
+        )
+        assert entry.url == "https://example.com/catalog.json"
+        assert entry.name == "test"
+        assert entry.priority == 1
+        assert entry.install_allowed is True
+
+
+# ===== Catalog Stack Tests =====
+
+class TestCatalogStack:
+    """Test multi-catalog stack support."""
+
+    def _make_project(self, temp_dir: Path) -> Path:
+        """Create a minimal spec-kit project directory."""
+        project_dir = temp_dir / "project"
+        project_dir.mkdir()
+        (project_dir / ".specify").mkdir()
+        return project_dir
+
+    def _write_catalog_config(self, project_dir: Path, catalogs: list) -> None:
+        """Write extension-catalogs.yml to project .specify dir."""
+        import yaml as yaml_module
+
+        config_path = project_dir / ".specify" / "extension-catalogs.yml"
+        with open(config_path, "w") as f:
+            yaml_module.dump({"catalogs": catalogs}, f)
+
+    def _write_valid_cache(
+        self, catalog: ExtensionCatalog, extensions: dict, url: str = "http://test.com"
+    ) -> None:
+        """Populate the primary cache file with mock extension data."""
+        catalog_data = {"schema_version": "1.0", "extensions": extensions}
+        catalog.cache_dir.mkdir(parents=True, exist_ok=True)
+        catalog.cache_file.write_text(json.dumps(catalog_data))
+        catalog.cache_metadata_file.write_text(
+            json.dumps(
+                {
+                    "cached_at": datetime.now(timezone.utc).isoformat(),
+                    "catalog_url": url,
+                }
+            )
+        )
+
+    # --- get_active_catalogs ---
+
+    def test_default_stack(self, temp_dir):
+        """Default stack includes org-approved and community catalogs."""
+        project_dir = self._make_project(temp_dir)
+        catalog = ExtensionCatalog(project_dir)
+
+        entries = catalog.get_active_catalogs()
+
+        assert len(entries) == 2
+        assert entries[0].url == ExtensionCatalog.DEFAULT_CATALOG_URL
+        assert entries[0].name == "org-approved"
+        assert entries[0].priority == 1
+        assert entries[0].install_allowed is True
+        assert entries[1].url == ExtensionCatalog.COMMUNITY_CATALOG_URL
+        assert entries[1].name == "community"
+        assert entries[1].priority == 2
+        assert entries[1].install_allowed is False
+
+    def test_env_var_overrides_default_stack(self, temp_dir, monkeypatch):
+        """SPECKIT_CATALOG_URL replaces the entire default stack."""
+        project_dir = self._make_project(temp_dir)
+        custom_url = "https://example.com/catalog.json"
+        monkeypatch.setenv("SPECKIT_CATALOG_URL", custom_url)
+
+        catalog = ExtensionCatalog(project_dir)
+        entries = catalog.get_active_catalogs()
+
+        assert len(entries) == 1
+        assert entries[0].url == custom_url
+        assert entries[0].install_allowed is True
+
+    def test_env_var_invalid_url_raises(self, temp_dir, monkeypatch):
+        """SPECKIT_CATALOG_URL with http:// (non-localhost) raises ValidationError."""
+        project_dir = self._make_project(temp_dir)
+        monkeypatch.setenv("SPECKIT_CATALOG_URL", "http://example.com/catalog.json")
+
+        catalog = ExtensionCatalog(project_dir)
+        with pytest.raises(ValidationError, match="HTTPS"):
+            catalog.get_active_catalogs()
+
+    def test_project_config_overrides_defaults(self, temp_dir):
+        """Project-level extension-catalogs.yml overrides default stack."""
+        project_dir = self._make_project(temp_dir)
+        self._write_catalog_config(
+            project_dir,
+            [
+                {
+                    "name": "custom",
+                    "url": "https://example.com/catalog.json",
+                    "priority": 1,
+                    "install_allowed": True,
+                }
+            ],
+        )
+
+        catalog = ExtensionCatalog(project_dir)
+        entries = catalog.get_active_catalogs()
+
+        assert len(entries) == 1
+        assert entries[0].url == "https://example.com/catalog.json"
+        assert entries[0].name == "custom"
+
+    def test_project_config_sorted_by_priority(self, temp_dir):
+        """Catalog entries are sorted by priority (ascending)."""
+        project_dir = self._make_project(temp_dir)
+        self._write_catalog_config(
+            project_dir,
+            [
+                {
+                    "name": "secondary",
+                    "url": "https://example.com/secondary.json",
+                    "priority": 5,
+                    "install_allowed": False,
+                },
+                {
+                    "name": "primary",
+                    "url": "https://example.com/primary.json",
+                    "priority": 1,
+                    "install_allowed": True,
+                },
+            ],
+        )
+
+        catalog = ExtensionCatalog(project_dir)
+        entries = catalog.get_active_catalogs()
+
+        assert len(entries) == 2
+        assert entries[0].name == "primary"
+        assert entries[1].name == "secondary"
+
+    def test_project_config_invalid_url_raises(self, temp_dir):
+        """Project config with HTTP (non-localhost) URL raises ValidationError."""
+        project_dir = self._make_project(temp_dir)
+        self._write_catalog_config(
+            project_dir,
+            [
+                {
+                    "name": "bad",
+                    "url": "http://example.com/catalog.json",
+                    "priority": 1,
+                    "install_allowed": True,
+                }
+            ],
+        )
+
+        catalog = ExtensionCatalog(project_dir)
+        with pytest.raises(ValidationError, match="HTTPS"):
+            catalog.get_active_catalogs()
+
+    def test_empty_project_config_falls_back_to_defaults(self, temp_dir):
+        """Empty catalogs list in config falls back to default stack."""
+        import yaml as yaml_module
+
+        project_dir = self._make_project(temp_dir)
+        config_path = project_dir / ".specify" / "extension-catalogs.yml"
+        with open(config_path, "w") as f:
+            yaml_module.dump({"catalogs": []}, f)
+
+        catalog = ExtensionCatalog(project_dir)
+        entries = catalog.get_active_catalogs()
+
+        # Falls back to default stack
+        assert len(entries) == 2
+        assert entries[0].url == ExtensionCatalog.DEFAULT_CATALOG_URL
+
+    # --- _load_catalog_config ---
+
+    def test_load_catalog_config_missing_file(self, temp_dir):
+        """Returns None when config file doesn't exist."""
+        project_dir = self._make_project(temp_dir)
+        catalog = ExtensionCatalog(project_dir)
+
+        result = catalog._load_catalog_config(project_dir / ".specify" / "nonexistent.yml")
+        assert result is None
+
+    def test_load_catalog_config_localhost_allowed(self, temp_dir):
+        """Localhost HTTP URLs are allowed in config."""
+        project_dir = self._make_project(temp_dir)
+        self._write_catalog_config(
+            project_dir,
+            [
+                {
+                    "name": "local",
+                    "url": "http://localhost:8000/catalog.json",
+                    "priority": 1,
+                    "install_allowed": True,
+                }
+            ],
+        )
+
+        catalog = ExtensionCatalog(project_dir)
+        entries = catalog.get_active_catalogs()
+
+        assert len(entries) == 1
+        assert entries[0].url == "http://localhost:8000/catalog.json"
+
+    # --- Merge conflict resolution ---
+
+    def test_merge_conflict_higher_priority_wins(self, temp_dir):
+        """When same extension id is in two catalogs, higher priority wins."""
+        import yaml as yaml_module
+
+        project_dir = self._make_project(temp_dir)
+
+        # Write project config with two catalogs
+        self._write_catalog_config(
+            project_dir,
+            [
+                {
+                    "name": "primary",
+                    "url": ExtensionCatalog.DEFAULT_CATALOG_URL,
+                    "priority": 1,
+                    "install_allowed": True,
+                },
+                {
+                    "name": "secondary",
+                    "url": ExtensionCatalog.COMMUNITY_CATALOG_URL,
+                    "priority": 2,
+                    "install_allowed": False,
+                },
+            ],
+        )
+
+        catalog = ExtensionCatalog(project_dir)
+
+        # Write primary cache with jira v2.0.0
+        primary_data = {
+            "schema_version": "1.0",
+            "extensions": {
+                "jira": {
+                    "name": "Jira Integration",
+                    "id": "jira",
+                    "version": "2.0.0",
+                    "description": "Primary Jira",
+                }
+            },
+        }
+        catalog.cache_dir.mkdir(parents=True, exist_ok=True)
+        catalog.cache_file.write_text(json.dumps(primary_data))
+        catalog.cache_metadata_file.write_text(
+            json.dumps({"cached_at": datetime.now(timezone.utc).isoformat(), "catalog_url": "http://test.com"})
+        )
+
+        # Write secondary cache (URL-hash-based) with jira v1.0.0 (should lose)
+        import hashlib
+
+        url_hash = hashlib.sha256(ExtensionCatalog.COMMUNITY_CATALOG_URL.encode()).hexdigest()[:16]
+        secondary_cache = catalog.cache_dir / f"catalog-{url_hash}.json"
+        secondary_meta = catalog.cache_dir / f"catalog-{url_hash}-metadata.json"
+        secondary_data = {
+            "schema_version": "1.0",
+            "extensions": {
+                "jira": {
+                    "name": "Jira Integration Community",
+                    "id": "jira",
+                    "version": "1.0.0",
+                    "description": "Community Jira",
+                },
+                "linear": {
+                    "name": "Linear",
+                    "id": "linear",
+                    "version": "0.9.0",
+                    "description": "Linear from secondary",
+                },
+            },
+        }
+        secondary_cache.write_text(json.dumps(secondary_data))
+        secondary_meta.write_text(
+            json.dumps({"cached_at": datetime.now(timezone.utc).isoformat(), "catalog_url": ExtensionCatalog.COMMUNITY_CATALOG_URL})
+        )
+
+        results = catalog.search()
+        jira_results = [r for r in results if r["id"] == "jira"]
+        assert len(jira_results) == 1
+        # Primary catalog wins
+        assert jira_results[0]["version"] == "2.0.0"
+        assert jira_results[0]["_catalog_name"] == "primary"
+        assert jira_results[0]["_install_allowed"] is True
+
+        # linear comes from secondary
+        linear_results = [r for r in results if r["id"] == "linear"]
+        assert len(linear_results) == 1
+        assert linear_results[0]["_catalog_name"] == "secondary"
+        assert linear_results[0]["_install_allowed"] is False
+
+    def test_install_allowed_false_from_get_extension_info(self, temp_dir):
+        """get_extension_info includes _install_allowed from source catalog."""
+        project_dir = self._make_project(temp_dir)
+
+        # Single catalog that is install_allowed=False
+        self._write_catalog_config(
+            project_dir,
+            [
+                {
+                    "name": "discovery",
+                    "url": ExtensionCatalog.DEFAULT_CATALOG_URL,
+                    "priority": 1,
+                    "install_allowed": False,
+                }
+            ],
+        )
+
+        catalog = ExtensionCatalog(project_dir)
+        self._write_valid_cache(
+            catalog,
+            {
+                "jira": {
+                    "name": "Jira Integration",
+                    "id": "jira",
+                    "version": "1.0.0",
+                    "description": "Jira integration",
+                }
+            },
+        )
+
+        info = catalog.get_extension_info("jira")
+        assert info is not None
+        assert info["_install_allowed"] is False
+        assert info["_catalog_name"] == "discovery"
+
+    def test_search_results_include_catalog_metadata(self, temp_dir):
+        """Search results include _catalog_name and _install_allowed."""
+        project_dir = self._make_project(temp_dir)
+        self._write_catalog_config(
+            project_dir,
+            [
+                {
+                    "name": "org",
+                    "url": ExtensionCatalog.DEFAULT_CATALOG_URL,
+                    "priority": 1,
+                    "install_allowed": True,
+                }
+            ],
+        )
+
+        catalog = ExtensionCatalog(project_dir)
+        self._write_valid_cache(
+            catalog,
+            {
+                "jira": {
+                    "name": "Jira Integration",
+                    "id": "jira",
+                    "version": "1.0.0",
+                    "description": "Jira integration",
+                }
+            },
+        )
+
+        results = catalog.search()
+        assert len(results) == 1
+        assert results[0]["_catalog_name"] == "org"
+        assert results[0]["_install_allowed"] is True