Add meta-tools, collections, and attribution features

Meta-tools:
- Add ToolStep dataclass for tools calling other tools
- Implement execute_tool_step() with recursion depth limiting
- Add check_dependencies() for validating tool dependencies
- Add 'cmdforge check' command for dependency verification

Collections:
- Add collections API endpoints and database schema
- Create collections web UI (list and detail pages)
- Add collections to navigation header and homepage
- Document collections in REGISTRY.md

Attribution:
- Add source attribution fields to tool detail page
- Document source types (original, adapted, imported)
- Add license field documentation

Documentation updates across README, DESIGN.md, REGISTRY.md,
and new META_TOOLS.md design document.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -26,6 +26,7 @@ echo "Price $49.99, SKU ABC-123" | json-extract --fields "price, sku"
 - **Provider Agnostic** - Works with Claude, GPT, Gemini, DeepSeek, local models
 - **No Lock-in** - Your tools are YAML files, your prompts are yours
 - **Multi-step Pipelines** - Chain AI prompts with Python code for validation
+- **Meta-tools** - Tools can call other tools for powerful composition
 - **12+ Providers Profiled** - We tested them so you don't have to
 
 ## Try It Now (60 seconds)
@@ -129,6 +130,7 @@ cmdforge edit mytool       # Edit in $EDITOR
 cmdforge delete mytool     # Delete tool
 cmdforge run mytool        # Run a tool
 cmdforge test mytool       # Test with mock provider
+cmdforge check mytool      # Check dependencies (meta-tools)
 cmdforge refresh           # Update executable wrappers
 ```
 
@@ -340,13 +342,44 @@ steps:
 output: "{validated}"
 ```
 
+### Meta-Tools (Tools Calling Tools)
+
+Tools can call other tools as steps, enabling powerful composition:
+
+```yaml
+name: summarize-and-translate
+description: Summarize text then translate the summary
+dependencies:
+  - official/summarize
+  - official/translate
+steps:
+  - type: tool
+    tool: official/summarize
+    input: "{input}"
+    args:
+      max_words: "100"
+    output_var: summary
+
+  - type: tool
+    tool: official/translate
+    input: "{summary}"
+    args:
+      target_language: "{language}"
+    output_var: translated
+output: "{translated}"
+```
+
+Check dependencies before running: `cmdforge check my-meta-tool`
+
+See [docs/META_TOOLS.md](docs/META_TOOLS.md) for full documentation.
+
 ### Variables
 
 | Variable | Description |
 |----------|-------------|
 | `{input}` | The piped/file input |
 | `{argname}` | Custom argument value |
-| `{step_output}` | Output from previous step |
+| `{output_var}` | Output from previous step (prompt, code, or tool) |
 
 ## Shell Integration
 
@@ -563,6 +596,7 @@ cmdforge providers test claude
 ### Developer Documentation
 - [Project Overview](docs/PROJECT.md) - Start here to understand the codebase
 - [Design Document](docs/DESIGN.md)
+- [Meta-Tools Design](docs/META_TOOLS.md) - Tools that call other tools
 - [Registry API Design](docs/REGISTRY.md)
 - [Web UI Design](docs/WEB_UI.md)
 - [Deployment Guide](docs/DEPLOYMENT.md)

docs/COLLECTIONS.md

@@ -0,0 +1,116 @@
+# CmdForge Collections
+
+Collections are curated groups of tools that can be installed together with a single command.
+
+## Use Cases
+
+1. **Thematic bundles**: "writing-toolkit" with grammar, tone, simplify tools
+2. **Application stacks**: "data-science" with json-extract, csv-insights, etc.
+3. **Source bundles**: "fabric-text" with all Fabric text processing patterns
+4. **Workflow packages**: Tools that work well together for a specific task
+
+## Collection Manifest Format
+
+Collections are defined in the registry repo under `collections/`:
+
+```yaml
+# collections/writing-toolkit.yaml
+name: writing-toolkit
+display_name: Writing Toolkit
+description: Essential tools for writers and editors
+icon: pencil  # Optional icon identifier
+maintainer: official  # Publisher who maintains this collection
+
+tools:
+  - official/fix-grammar
+  - official/simplify
+  - official/tone-shift
+  - official/expand
+  - official/proofread
+
+# Optional: version constraints
+pinned:
+  official/fix-grammar: "^1.0.0"
+
+# Optional: suggested order for documentation
+order:
+  - official/fix-grammar
+  - official/proofread
+  - official/simplify
+  - official/tone-shift
+  - official/expand
+
+tags:
+  - writing
+  - editing
+  - grammar
+```
+
+## CLI Usage
+
+```bash
+# List available collections
+cmdforge collections list
+
+# View collection details
+cmdforge collections info writing-toolkit
+
+# Install all tools in a collection
+cmdforge collections install writing-toolkit
+
+# Install with version constraints from collection
+cmdforge collections install writing-toolkit --pinned
+```
+
+## API Endpoints
+
+```
+GET  /api/v1/collections              # List all collections
+GET  /api/v1/collections/:name        # Get collection details with tool info
+GET  /api/v1/collections/:name/tools  # Get just the tools list
+```
+
+## Database Schema
+
+```sql
+CREATE TABLE collections (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name TEXT UNIQUE NOT NULL,
+    display_name TEXT NOT NULL,
+    description TEXT,
+    icon TEXT,
+    maintainer TEXT NOT NULL,
+    tools TEXT NOT NULL,           -- JSON array of tool refs
+    pinned TEXT,                   -- JSON object of version constraints
+    tags TEXT,                     -- JSON array
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_collections_name ON collections(name);
+CREATE INDEX idx_collections_maintainer ON collections(maintainer);
+```
+
+## Web UI
+
+- `/collections` - Browse all collections
+- `/collections/:name` - Collection detail page with tool grid
+- Install button that shows CLI command
+- Filter by tag, maintainer
+
+## Sync from Registry Repo
+
+Collections sync from the registry repo just like tools:
+
+```
+CmdForge-Registry/
+├── tools/
+│   └── ...
+└── collections/
+    ├── writing-toolkit.yaml
+    ├── data-science.yaml
+    ├── fabric-text.yaml
+    └── fabric-code.yaml
+```
+
+The webhook sync process reads `collections/*.yaml` and upserts to database.

docs/DESIGN.md

@@ -46,6 +46,11 @@ steps:
     provider: claude
     output_var: response
 output: "{response}"
+
+# Optional: declare dependencies for meta-tools
+dependencies:
+  - official/summarize
+  - official/translate@^1.0.0    # With version constraint
 ```
 
 ### Step Types
@@ -68,6 +73,17 @@ output: "{response}"
   code_file: processed.py    # Optional: external file storage
 ```
 
+**Tool Step** - Calls another CmdForge tool (meta-tools):
+```yaml
+- type: tool
+  tool: official/summarize    # Tool reference (owner/name or just name for local)
+  input: "{input}"            # Input to pass (supports variable substitution)
+  args:                       # Optional arguments
+    max_words: "100"
+  output_var: summary         # Variable to store the tool's output
+  provider: claude            # Optional: override the called tool's provider
+```
+
 Steps execute in order. Each step's `output_var` becomes available to subsequent steps.
 
 ### Variables
@@ -168,6 +184,7 @@ cmdforge delete sum        # Delete tool
 cmdforge test sum          # Test with mock provider
 cmdforge run sum           # Run tool for real
 cmdforge refresh           # Refresh all wrapper scripts
+cmdforge check sum         # Check dependencies for meta-tools
 cmdforge ui                # Launch interactive UI
 ```
 

docs/META_TOOLS.md

@@ -0,0 +1,249 @@
+# Meta-Tools: Tools That Call Other Tools
+
+Meta-tools are CmdForge tools that can invoke other tools as steps in their workflow. This enables powerful composition and reuse of existing tools.
+
+## Step Type: `tool`
+
+A new step type `tool` allows calling another CmdForge tool from within a tool's workflow.
+
+### Manifest Format
+
+```yaml
+name: summarize-and-translate
+description: Summarize text then translate the summary
+version: 1.0.0
+category: Text
+
+steps:
+  - type: tool
+    tool: official/summarize        # Tool to call (owner/name or just name for local)
+    input: "{input}"                # What to pass as input (supports variable substitution)
+    args:                           # Optional arguments to pass to the tool
+      max_words: "100"
+    output_var: summary             # Variable to store the output
+
+  - type: tool
+    tool: official/translate
+    input: "{summary}"              # Use output from previous step
+    args:
+      target_language: "{language}" # Can use tool's own arguments
+    output_var: translated
+
+output: "{translated}"
+
+arguments:
+  - flag: "--language"
+    variable: language
+    default: "Spanish"
+    description: "Target language for translation"
+```
+
+### Resolution Order
+
+When resolving a tool reference in a `tool` step:
+
+1. **Fully qualified**: `owner/name` - looks up in registry or installed tools
+2. **Local tool**: Just `name` - checks local `~/.cmdforge/<name>/config.yaml` first
+3. **Registry fallback**: If not found locally, checks installed registry tools
+
+### Tool Step Properties
+
+| Property | Required | Description |
+|----------|----------|-------------|
+| `type` | Yes | Must be `"tool"` |
+| `tool` | Yes | Tool reference (owner/name or name) |
+| `input` | No | Input to pass to the tool (default: current `{input}`) |
+| `args` | No | Dictionary of arguments to pass |
+| `output_var` | Yes | Variable name to store the tool's output |
+| `provider` | No | Override provider for the called tool |
+
+### Execution
+
+When a `tool` step executes:
+
+1. Resolve the tool reference to find the tool definition
+2. Substitute variables in `input` and `args` values
+3. Execute the tool with the resolved input and arguments
+4. Capture the output in the specified `output_var`
+
+### Error Handling
+
+- If a called tool fails, the parent tool fails with an appropriate error
+- Tool not found errors include helpful installation suggestions
+- Circular dependencies are detected and prevented
+
+## Dependency Resolution
+
+### Declaring Dependencies
+
+Tools can declare their dependencies in the config:
+
+```yaml
+name: my-meta-tool
+dependencies:
+  - official/summarize
+  - official/translate@^1.0.0    # With version constraint
+```
+
+### CLI Integration
+
+```bash
+# Install a tool and its dependencies
+cmdforge install official/summarize-and-translate
+
+# Check if dependencies are satisfied
+cmdforge check my-meta-tool
+
+# Install missing dependencies
+cmdforge install --deps my-meta-tool
+```
+
+### Dependency Checking
+
+Before running a meta-tool, the runner verifies all dependencies are installed:
+
+```python
+def check_dependencies(tool: Tool) -> List[str]:
+    """Returns list of missing dependencies."""
+    missing = []
+    for dep in tool.dependencies:
+        if not is_tool_installed(dep):
+            missing.append(dep)
+    return missing
+```
+
+## Security Considerations
+
+1. **Sandboxing**: Called tools run in the same process context as the parent
+2. **Input validation**: All inputs are treated as untrusted strings
+3. **No shell execution**: Tool references cannot contain shell commands
+4. **Depth limit**: Maximum nesting depth (default: 10) prevents runaway recursion
+
+## Example: Multi-Step Analysis Pipeline
+
+```yaml
+name: code-review-pipeline
+description: Comprehensive code review using multiple specialized tools
+version: 1.0.0
+category: Developer
+
+dependencies:
+  - official/analyze-complexity
+  - official/find-bugs
+  - official/suggest-improvements
+
+steps:
+  # Step 1: Analyze code complexity
+  - type: tool
+    tool: official/analyze-complexity
+    input: "{input}"
+    output_var: complexity_report
+
+  # Step 2: Find potential bugs
+  - type: tool
+    tool: official/find-bugs
+    input: "{input}"
+    output_var: bug_report
+
+  # Step 3: Generate improvement suggestions based on findings
+  - type: tool
+    tool: official/suggest-improvements
+    input: |
+      ## Code:
+      {input}
+
+      ## Complexity Analysis:
+      {complexity_report}
+
+      ## Bug Report:
+      {bug_report}
+    output_var: suggestions
+
+output: |
+  # Code Review Results
+
+  ## Complexity Analysis
+  {complexity_report}
+
+  ## Potential Issues
+  {bug_report}
+
+  ## Improvement Suggestions
+  {suggestions}
+```
+
+## Implementation Notes
+
+### ToolStep Dataclass
+
+```python
+@dataclass
+class ToolStep:
+    """A step that calls another tool."""
+    tool: str                           # Tool reference (owner/name or name)
+    output_var: str                     # Variable to store output
+    input_template: str = "{input}"     # Input template
+    args: Dict[str, str] = field(default_factory=dict)
+    provider: Optional[str] = None      # Provider override
+
+    def to_dict(self) -> dict:
+        d = {
+            "type": "tool",
+            "tool": self.tool,
+            "output_var": self.output_var,
+        }
+        if self.input_template != "{input}":
+            d["input"] = self.input_template
+        if self.args:
+            d["args"] = self.args
+        if self.provider:
+            d["provider"] = self.provider
+        return d
+```
+
+### Execution Function
+
+```python
+def execute_tool_step(
+    step: ToolStep,
+    variables: dict,
+    depth: int = 0,
+    max_depth: int = 10
+) -> tuple[str, bool]:
+    """Execute a tool step by calling another tool."""
+    if depth >= max_depth:
+        return "", False  # Prevent infinite recursion
+
+    # Resolve the tool
+    try:
+        resolved = resolve_tool(step.tool)
+    except ToolNotFoundError:
+        print(f"Error: Tool '{step.tool}' not found", file=sys.stderr)
+        return "", False
+
+    # Prepare input
+    input_text = substitute_variables(step.input_template, variables)
+
+    # Prepare arguments
+    args = {}
+    for key, value in step.args.items():
+        args[key] = substitute_variables(value, variables)
+
+    # Run the tool
+    output, exit_code = run_tool(
+        tool=resolved.tool,
+        input_text=input_text,
+        custom_args=args,
+        provider_override=step.provider,
+        _depth=depth + 1  # Track nesting depth
+    )
+
+    return output, exit_code == 0
+```
+
+## Future Enhancements
+
+- **Parallel tool execution**: Run independent tool steps concurrently
+- **Conditional execution**: Skip steps based on conditions
+- **Tool aliases**: Define shorthand names for frequently used tools
+- **Caching**: Cache tool outputs for identical inputs

docs/REGISTRY.md

@@ -36,6 +36,8 @@ Core API endpoints:
 - `GET /api/v1/tools/{owner}/{name}/download?version=...`
 - `POST /api/v1/tools` (publish)
 - `GET /api/v1/categories`
+- `GET /api/v1/collections`
+- `GET /api/v1/collections/{name}`
 - `GET /api/v1/stats/popular`
 - `POST /api/v1/webhook/gitea`
 
@@ -239,6 +241,124 @@ registry:
   downloads: 142
 ```
 
+### Attribution and Source Fields
+
+Tools can include optional source attribution for provenance and licensing:
+
+```yaml
+name: summarize
+version: "1.2.0"
+description: "Summarize text using AI"
+
+# Attribution fields (optional)
+source:
+  type: original           # original, adapted, or imported
+  license: MIT             # SPDX license identifier
+  url: https://example.com/tool-repo
+  author: "Original Author"
+
+  # For adapted/imported tools
+  original_tool: other/original-summarize@1.0.0
+  changes: "Added French language support"
+```
+
+**Source types:**
+
+| Type | Description |
+|------|-------------|
+| `original` | Created from scratch by the publisher |
+| `adapted` | Based on another tool with modifications |
+| `imported` | Direct import of external tool (e.g., from npm/pip) |
+
+**License field:**
+- Uses SPDX identifiers: `MIT`, `Apache-2.0`, `GPL-3.0`, etc.
+- Required for registry publication
+- Validated against SPDX license list
+
+## Collections
+
+Collections are curated groups of tools that can be installed together with a single command.
+
+### Collection Structure
+
+Collections are defined in `collections/{name}.yaml`:
+
+```yaml
+name: text-processing-essentials
+display_name: "Text Processing Essentials"
+description: "Essential tools for text processing and manipulation"
+icon: "📝"
+
+tools:
+  - official/summarize
+  - official/translate
+  - official/fix-grammar
+  - official/simplify
+  - official/tone-shift
+
+# Optional
+curator: official
+tags: ["text", "nlp", "writing"]
+```
+
+### Collections API
+
+**List all collections:**
+```
+GET /api/v1/collections
+
+Response:
+{
+  "data": [
+    {
+      "name": "text-processing-essentials",
+      "display_name": "Text Processing Essentials",
+      "description": "Essential tools for text processing...",
+      "icon": "📝",
+      "tool_count": 5,
+      "curator": "official"
+    }
+  ],
+  "meta": {"page": 1, "per_page": 20, "total": 8}
+}
+```
+
+**Get collection details:**
+```
+GET /api/v1/collections/{name}
+
+Response:
+{
+  "data": {
+    "name": "text-processing-essentials",
+    "display_name": "Text Processing Essentials",
+    "description": "Essential tools for text processing...",
+    "icon": "📝",
+    "curator": "official",
+    "tools": [
+      {"owner": "official", "name": "summarize", "version": "1.2.0", ...},
+      {"owner": "official", "name": "translate", "version": "2.1.0", ...}
+    ]
+  }
+}
+```
+
+### CLI Commands
+
+```bash
+# List available collections
+cmdforge registry collections
+
+# View collection details
+cmdforge registry collections text-processing-essentials
+
+# Install all tools in a collection
+cmdforge registry install --collection text-processing-essentials
+
+# Show what would be installed (dry run)
+cmdforge registry install --collection text-processing-essentials --dry-run
+```
+
 **Schema compatibility note:** The current CmdForge config parser may reject unknown top-level keys like `deprecated`, `replacement`, and `registry`. Before implementing registry features:
 1. Update the YAML parser to ignore unknown keys (permissive mode)
 2. Or explicitly define these fields in the Tool dataclass with defaults
@@ -1151,6 +1271,11 @@ CmdForge-Registry/
 ├── categories/
 │   └── categories.yaml              # Category definitions
 │
+├── collections/                     # Curated tool collections
+│   ├── text-processing-essentials.yaml
+│   ├── developer-toolkit.yaml
+│   └── data-pipeline-basics.yaml
+│
 ├── index.json                       # Auto-generated search index
 │
 ├── .gitea/
@@ -1736,6 +1861,8 @@ cmdforge.brrd.tech (or gitea.brrd.tech/registry)
 ├── /tools/{owner}/{name}       # Tool detail page
 ├── /categories                 # Browse by category
 ├── /categories/{name}          # Tools in category
+├── /collections                # Browse curated collections
+├── /collections/{name}         # Collection detail page
 ├── /search?q=...               # Search results
 ├── /docs                       # Documentation
 │   ├── /docs/getting-started

src/cmdforge/cli/__init__.py

@@ -7,7 +7,7 @@ from .. import __version__
 
 from .tool_commands import (
     cmd_list, cmd_create, cmd_edit, cmd_delete, cmd_test, cmd_run,
-    cmd_ui, cmd_refresh, cmd_docs
+    cmd_ui, cmd_refresh, cmd_docs, cmd_check
 )
 from .provider_commands import cmd_providers
 from .registry_commands import cmd_registry
@@ -84,6 +84,11 @@ def main():
     p_docs.add_argument("-e", "--edit", action="store_true", help="Edit/create README in $EDITOR")
     p_docs.set_defaults(func=cmd_docs)
 
+    # 'check' command
+    p_check = subparsers.add_parser("check", help="Check dependencies for a tool (meta-tools)")
+    p_check.add_argument("name", help="Tool name")
+    p_check.set_defaults(func=cmd_check)
+
     # 'providers' command
     p_providers = subparsers.add_parser("providers", help="Manage AI providers")
     providers_sub = p_providers.add_subparsers(dest="providers_cmd", help="Provider commands")

src/cmdforge/cli/tool_commands.py

@@ -5,7 +5,7 @@ from pathlib import Path
 
 from ..tool import (
     list_tools, load_tool, save_tool, delete_tool, get_tools_dir,
-    Tool, ToolArgument, PromptStep, CodeStep
+    Tool, ToolArgument, PromptStep, CodeStep, ToolStep
 )
 from ..ui import run_ui
 
@@ -39,6 +39,8 @@ def cmd_list(args):
                         step_info.append(f"PROMPT[{step.provider}]")
                     elif isinstance(step, CodeStep):
                         step_info.append("CODE")
+                    elif isinstance(step, ToolStep):
+                        step_info.append(f"TOOL[{step.tool}]")
                 print(f"    Steps: {' -> '.join(step_info)}")
 
             print()
@@ -331,3 +333,55 @@ echo "input" | {args.name}
 
         print(readme_path.read_text())
         return 0
+
+
+def cmd_check(args):
+    """Check dependencies for a tool (meta-tools)."""
+    from ..runner import check_dependencies
+    from ..tool import ToolStep
+
+    tool = load_tool(args.name)
+    if not tool:
+        print(f"Error: Tool '{args.name}' not found.")
+        return 1
+
+    # Check if this is a meta-tool
+    has_tool_steps = any(isinstance(s, ToolStep) for s in tool.steps)
+    has_deps = bool(tool.dependencies)
+
+    if not has_tool_steps and not has_deps:
+        print(f"Tool '{args.name}' has no dependencies (not a meta-tool).")
+        return 0
+
+    print(f"Checking dependencies for '{args.name}'...")
+    print()
+
+    # Show declared dependencies
+    if tool.dependencies:
+        print("Declared dependencies:")
+        for dep in tool.dependencies:
+            print(f"  - {dep}")
+        print()
+
+    # Show tool steps
+    if has_tool_steps:
+        print("Tool steps (implicit dependencies):")
+        for i, step in enumerate(tool.steps):
+            if isinstance(step, ToolStep):
+                print(f"  Step {i+1}: {step.tool}")
+        print()
+
+    # Check which are missing
+    missing = check_dependencies(tool)
+
+    if missing:
+        print(f"Missing dependencies ({len(missing)}):")
+        for dep in missing:
+            print(f"  - {dep}")
+        print()
+        print("Install with:")
+        print(f"  cmdforge install {' '.join(missing)}")
+        return 1
+    else:
+        print("All dependencies are satisfied.")
+        return 0

src/cmdforge/registry/app.py

@@ -710,6 +710,96 @@ def create_app() -> Flask:
         response.headers["Cache-Control"] = "max-age=3600"
         return response
 
+    # ─── Collections ─────────────────────────────────────────────────────────────
+
+    @app.route("/api/v1/collections", methods=["GET"])
+    def list_collections() -> Response:
+        """List all collections."""
+        rows = query_all(
+            g.db,
+            "SELECT * FROM collections ORDER BY name",
+        )
+        data = []
+        for row in rows:
+            tools = json.loads(row["tools"]) if row["tools"] else []
+            tags = json.loads(row["tags"]) if row["tags"] else []
+            data.append({
+                "name": row["name"],
+                "display_name": row["display_name"],
+                "description": row["description"],
+                "icon": row["icon"],
+                "maintainer": row["maintainer"],
+                "tool_count": len(tools),
+                "tags": tags,
+            })
+        response = jsonify({"data": data})
+        response.headers["Cache-Control"] = "max-age=3600"
+        return response
+
+    @app.route("/api/v1/collections/<name>", methods=["GET"])
+    def get_collection(name: str) -> Response:
+        """Get collection details with tool information."""
+        row = query_one(g.db, "SELECT * FROM collections WHERE name = ?", [name])
+        if not row:
+            return error_response("COLLECTION_NOT_FOUND", f"Collection '{name}' not found", 404)
+
+        tools_refs = json.loads(row["tools"]) if row["tools"] else []
+        pinned = json.loads(row["pinned"]) if row["pinned"] else {}
+        tags = json.loads(row["tags"]) if row["tags"] else []
+
+        # Fetch tool details for each tool in the collection
+        tools_data = []
+        for ref in tools_refs:
+            parts = ref.split("/")
+            if len(parts) != 2:
+                continue
+            owner, tool_name = parts
+            tool_row = query_one(
+                g.db,
+                """
+                SELECT * FROM tools
+                WHERE owner = ? AND name = ? AND version NOT LIKE '%-%'
+                ORDER BY id DESC LIMIT 1
+                """,
+                [owner, tool_name],
+            )
+            if tool_row:
+                tools_data.append({
+                    "owner": tool_row["owner"],
+                    "name": tool_row["name"],
+                    "version": tool_row["version"],
+                    "description": tool_row["description"],
+                    "category": tool_row["category"],
+                    "downloads": tool_row["downloads"],
+                    "pinned_version": pinned.get(ref),
+                })
+            else:
+                # Tool not found in registry
+                tools_data.append({
+                    "owner": owner,
+                    "name": tool_name,
+                    "version": None,
+                    "description": None,
+                    "category": None,
+                    "downloads": 0,
+                    "pinned_version": pinned.get(ref),
+                    "missing": True,
+                })
+
+        response = jsonify({
+            "data": {
+                "name": row["name"],
+                "display_name": row["display_name"],
+                "description": row["description"],
+                "icon": row["icon"],
+                "maintainer": row["maintainer"],
+                "tools": tools_data,
+                "tags": tags,
+            }
+        })
+        response.headers["Cache-Control"] = "max-age=3600"
+        return response
+
     @app.route("/api/v1/stats/popular", methods=["GET"])
     def popular_tools() -> Response:
         limit = min(int(request.args.get("limit", 10)), 50)
@@ -1010,6 +1100,8 @@ def create_app() -> Flask:
         description = (data.get("description") or "").strip()
         category = (data.get("category") or "").strip() or None
         tags = data.get("tags") or []
+        source = (data.get("source") or "").strip() or None
+        source_url = (data.get("source_url") or "").strip() or None
 
         if not name or not TOOL_NAME_RE.match(name) or len(name) > MAX_TOOL_NAME_LEN:
             return error_response("VALIDATION_ERROR", "Invalid tool name")
@@ -1126,8 +1218,8 @@ def create_app() -> Flask:
             INSERT INTO tools (
                 owner, name, version, description, category, tags, config_yaml, readme,
                 publisher_id, deprecated, deprecated_message, replacement, downloads,
-                scrutiny_status, scrutiny_report, published_at
+                scrutiny_status, scrutiny_report, source, source_url, published_at
-            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
             """,
             [
                 owner,
@@ -1145,6 +1237,8 @@ def create_app() -> Flask:
                 0,
                 scrutiny_status,
                 scrutiny_json,
+                source,
+                source_url,
                 datetime.utcnow().isoformat(),
             ],
         )

src/cmdforge/registry/db.py

@@ -51,6 +51,8 @@ CREATE TABLE IF NOT EXISTS tools (
     downloads INTEGER DEFAULT 0,
     scrutiny_status TEXT DEFAULT 'pending',
     scrutiny_report TEXT,
+    source TEXT,
+    source_url TEXT,
     published_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     UNIQUE(owner, name, version)
 );
@@ -228,6 +230,24 @@ CREATE TABLE IF NOT EXISTS pageviews (
 
 CREATE INDEX IF NOT EXISTS idx_pageviews_path ON pageviews(path, viewed_at DESC);
 CREATE INDEX IF NOT EXISTS idx_pageviews_date ON pageviews(date(viewed_at), path);
+
+-- Collections (groups of tools that can be installed together)
+CREATE TABLE IF NOT EXISTS collections (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name TEXT UNIQUE NOT NULL,
+    display_name TEXT NOT NULL,
+    description TEXT,
+    icon TEXT,
+    maintainer TEXT NOT NULL,
+    tools TEXT NOT NULL,
+    pinned TEXT,
+    tags TEXT,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_collections_name ON collections(name);
+CREATE INDEX IF NOT EXISTS idx_collections_maintainer ON collections(maintainer);
 """
 
 

src/cmdforge/registry/sync.py

@@ -173,6 +173,52 @@ def sync_categories(repo_dir: Path) -> None:
     cache_path.write_text(json.dumps(payload, indent=2), encoding="utf-8")
 
 
+def sync_collections(conn, repo_dir: Path) -> None:
+    """Sync collections from registry repo to database."""
+    collections_dir = repo_dir / "collections"
+    if not collections_dir.exists():
+        return
+
+    for collection_path in collections_dir.glob("*.yaml"):
+        try:
+            data = load_yaml(collection_path)
+            name = data.get("name") or collection_path.stem
+            display_name = data.get("display_name") or name
+            description = data.get("description")
+            icon = data.get("icon")
+            maintainer = data.get("maintainer") or "official"
+            tools = data.get("tools") or []
+            pinned = data.get("pinned") or {}
+            tags = data.get("tags") or []
+
+            tools_json = json.dumps(tools)
+            pinned_json = json.dumps(pinned) if pinned else None
+            tags_json = json.dumps(tags) if tags else None
+
+            existing = query_one(conn, "SELECT id FROM collections WHERE name = ?", [name])
+            if existing:
+                conn.execute(
+                    """
+                    UPDATE collections
+                    SET display_name = ?, description = ?, icon = ?, maintainer = ?,
+                        tools = ?, pinned = ?, tags = ?, updated_at = ?
+                    WHERE id = ?
+                    """,
+                    [display_name, description, icon, maintainer, tools_json,
+                     pinned_json, tags_json, datetime.utcnow().isoformat(), existing["id"]],
+                )
+            else:
+                conn.execute(
+                    """
+                    INSERT INTO collections (name, display_name, description, icon, maintainer, tools, pinned, tags)
+                    VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+                    """,
+                    [name, display_name, description, icon, maintainer, tools_json, pinned_json, tags_json],
+                )
+        except Exception:
+            continue
+
+
 def sync_from_repo() -> Tuple[bool, str]:
     repo_dir = get_repo_dir()
     clone_or_update_repo(repo_dir)
@@ -195,6 +241,7 @@ def sync_from_repo() -> Tuple[bool, str]:
                 upsert_tool(conn, owner, name, data, config_text, readme_text)
             except Exception:
                 continue
+        sync_collections(conn, repo_dir)
         conn.commit()
     finally:
         conn.close()

src/cmdforge/runner.py

@@ -5,11 +5,63 @@ import sys
 from pathlib import Path
 from typing import Optional
 
-from .tool import Tool, PromptStep, CodeStep
+from .tool import Tool, PromptStep, CodeStep, ToolStep
 from .providers import call_provider, mock_provider
 from .resolver import resolve_tool, ToolNotFoundError, ToolSpec
 from .manifest import load_manifest
 
+# Maximum recursion depth for nested tool calls
+MAX_TOOL_DEPTH = 10
+
+
+def check_dependencies(tool: Tool, checked: set = None) -> list[str]:
+    """
+    Check if all dependencies for a tool are available.
+
+    Args:
+        tool: Tool to check dependencies for
+        checked: Set of already checked tools (prevents infinite loops)
+
+    Returns:
+        List of missing dependency tool references
+    """
+    if checked is None:
+        checked = set()
+
+    missing = []
+
+    # Check explicit dependencies
+    for dep in tool.dependencies:
+        if dep in checked:
+            continue
+        checked.add(dep)
+
+        try:
+            resolved = resolve_tool(dep)
+            # Recursively check nested dependencies
+            nested_missing = check_dependencies(resolved.tool, checked)
+            missing.extend(nested_missing)
+        except ToolNotFoundError:
+            missing.append(dep)
+
+    # Also check tool steps for implicit dependencies
+    for step in tool.steps:
+        if isinstance(step, ToolStep):
+            tool_ref = step.tool
+            if tool_ref in checked:
+                continue
+            checked.add(tool_ref)
+
+            try:
+                resolved = resolve_tool(tool_ref)
+                # Recursively check nested dependencies
+                nested_missing = check_dependencies(resolved.tool, checked)
+                missing.extend(nested_missing)
+            except ToolNotFoundError:
+                missing.append(tool_ref)
+
+    return missing
+
 
 def substitute_variables(template: str, variables: dict) -> str:
     """
@@ -111,6 +163,75 @@ def execute_code_step(step: CodeStep, variables: dict) -> tuple[dict, bool]:
         return {}, False
 
 
+def execute_tool_step(
+    step: ToolStep,
+    variables: dict,
+    depth: int = 0,
+    provider_override: Optional[str] = None,
+    dry_run: bool = False,
+    verbose: bool = False
+) -> tuple[str, bool]:
+    """
+    Execute a tool step by calling another tool.
+
+    Args:
+        step: The tool step to execute
+        variables: Current variable values
+        depth: Current recursion depth
+        provider_override: Override provider for nested calls
+        dry_run: Just show what would happen
+        verbose: Show debug info
+
+    Returns:
+        Tuple of (output_value, success)
+    """
+    if depth >= MAX_TOOL_DEPTH:
+        print(f"Error: Maximum tool nesting depth ({MAX_TOOL_DEPTH}) exceeded", file=sys.stderr)
+        return "", False
+
+    # Resolve the tool reference
+    try:
+        resolved = resolve_tool(step.tool)
+        nested_tool = resolved.tool
+    except ToolNotFoundError as e:
+        print(f"Error: Tool '{step.tool}' not found", file=sys.stderr)
+        print(f"Hint: Install it with: cmdforge install {step.tool}", file=sys.stderr)
+        return "", False
+
+    # Prepare input by substituting variables
+    input_text = substitute_variables(step.input_template, variables)
+
+    # Prepare arguments by substituting variables in arg values
+    custom_args = {}
+    for key, value in step.args.items():
+        custom_args[key] = substitute_variables(str(value), variables)
+
+    # Determine effective provider (step override > parent override)
+    effective_provider = step.provider or provider_override
+
+    if verbose:
+        print(f"[verbose] Tool step: calling {step.tool}", file=sys.stderr)
+        print(f"[verbose]   Input length: {len(input_text)} chars", file=sys.stderr)
+        print(f"[verbose]   Args: {list(custom_args.keys())}", file=sys.stderr)
+
+    if dry_run:
+        return f"[DRY RUN - would call tool {step.tool}]", True
+
+    # Run the nested tool
+    output, exit_code = run_tool(
+        tool=nested_tool,
+        input_text=input_text,
+        custom_args=custom_args,
+        provider_override=effective_provider,
+        dry_run=dry_run,
+        show_prompt=False,
+        verbose=verbose,
+        _depth=depth + 1  # Track nesting depth
+    )
+
+    return output, exit_code == 0
+
+
 def run_tool(
     tool: Tool,
     input_text: str,
@@ -118,7 +239,8 @@ def run_tool(
     provider_override: Optional[str] = None,
     dry_run: bool = False,
     show_prompt: bool = False,
-    verbose: bool = False
+    verbose: bool = False,
+    _depth: int = 0  # Internal: tracks nesting depth for tool steps
 ) -> tuple[str, int]:
     """
     Execute a tool.
@@ -131,10 +253,19 @@ def run_tool(
         dry_run: Just show what would happen
         show_prompt: Show prompts in addition to output
         verbose: Show debug info
+        _depth: Internal recursion depth tracker
 
     Returns:
         Tuple of (output_text, exit_code)
     """
+    # Check dependencies on first level only (not for nested calls)
+    if _depth == 0 and (tool.dependencies or any(isinstance(s, ToolStep) for s in tool.steps)):
+        missing = check_dependencies(tool)
+        if missing:
+            print(f"Warning: Missing dependencies: {', '.join(missing)}", file=sys.stderr)
+            print(f"Install with: cmdforge install {' '.join(missing)}", file=sys.stderr)
+            # Continue anyway - the actual step execution will fail with a better error
+
     # Initialize variables with input and arguments
     variables = {"input": input_text}
 
@@ -156,7 +287,14 @@ def run_tool(
     # Execute each step
     for i, step in enumerate(tool.steps):
         if verbose:
-            step_type = "PROMPT" if isinstance(step, PromptStep) else "CODE"
+            if isinstance(step, PromptStep):
+                step_type = "PROMPT"
+            elif isinstance(step, CodeStep):
+                step_type = "CODE"
+            elif isinstance(step, ToolStep):
+                step_type = f"TOOL({step.tool})"
+            else:
+                step_type = "UNKNOWN"
             print(f"[verbose] Step {i+1}: {step_type} -> {{{step.output_var}}}", file=sys.stderr)
 
         if isinstance(step, PromptStep):
@@ -192,6 +330,25 @@ def run_tool(
                 # Merge all output vars into variables
                 variables.update(outputs)
 
+        elif isinstance(step, ToolStep):
+            if verbose or dry_run:
+                print(f"=== TOOL (Step {i+1}) -> {{{step.output_var}}} ===", file=sys.stderr)
+                print(f"  Calling: {step.tool}", file=sys.stderr)
+                print(f"  Args: {step.args}", file=sys.stderr)
+                print("=== END TOOL ===", file=sys.stderr)
+
+            output, success = execute_tool_step(
+                step,
+                variables,
+                depth=_depth,
+                provider_override=provider_override,
+                dry_run=dry_run,
+                verbose=verbose
+            )
+            if not success:
+                return "", 3
+            variables[step.output_var] = output
+
     # Generate final output
     output = substitute_variables(tool.output, variables)
 

src/cmdforge/tool.py

@@ -97,7 +97,41 @@ class CodeStep:
         )
 
 
-Step = PromptStep | CodeStep
+@dataclass
+class ToolStep:
+    """A step that calls another tool."""
+    tool: str                      # Tool reference (owner/name or just name)
+    output_var: str                # Variable to store output
+    input_template: str = "{input}"  # Input template (supports variable substitution)
+    args: dict = field(default_factory=dict)  # Arguments to pass to the tool
+    provider: Optional[str] = None  # Provider override for the called tool
+
+    def to_dict(self) -> dict:
+        d = {
+            "type": "tool",
+            "tool": self.tool,
+            "output_var": self.output_var,
+        }
+        if self.input_template != "{input}":
+            d["input"] = self.input_template
+        if self.args:
+            d["args"] = self.args
+        if self.provider:
+            d["provider"] = self.provider
+        return d
+
+    @classmethod
+    def from_dict(cls, data: dict) -> "ToolStep":
+        return cls(
+            tool=data["tool"],
+            output_var=data["output_var"],
+            input_template=data.get("input", "{input}"),
+            args=data.get("args", {}),
+            provider=data.get("provider")
+        )
+
+
+Step = PromptStep | CodeStep | ToolStep
 
 
 # Default categories for organizing tools
@@ -113,6 +147,7 @@ class Tool:
     arguments: List[ToolArgument] = field(default_factory=list)
     steps: List[Step] = field(default_factory=list)
     output: str = "{input}"  # Output template
+    dependencies: List[str] = field(default_factory=list)  # Required tools for meta-tools
 
     @classmethod
     def from_dict(cls, data: dict) -> "Tool":
@@ -126,6 +161,8 @@ class Tool:
                 steps.append(PromptStep.from_dict(step))
             elif step.get("type") == "code":
                 steps.append(CodeStep.from_dict(step))
+            elif step.get("type") == "tool":
+                steps.append(ToolStep.from_dict(step))
 
         return cls(
             name=data["name"],
@@ -133,7 +170,8 @@ class Tool:
             category=data.get("category", "Other"),
             arguments=arguments,
             steps=steps,
-            output=data.get("output", "{input}")
+            output=data.get("output", "{input}"),
+            dependencies=data.get("dependencies", [])
         )
 
     def to_dict(self) -> dict:
@@ -144,6 +182,8 @@ class Tool:
         # Only include category if it's not the default
         if self.category and self.category != "Other":
             d["category"] = self.category
+        if self.dependencies:
+            d["dependencies"] = self.dependencies
         d["arguments"] = [arg.to_dict() for arg in self.arguments]
         d["steps"] = [step.to_dict() for step in self.steps]
         d["output"] = self.output

src/cmdforge/web/routes.py

@@ -644,6 +644,7 @@ def sitemap():
     static_pages = [
         ("/", "1.0", "daily"),
         ("/tools", "0.9", "daily"),
+        ("/collections", "0.8", "weekly"),
         ("/docs", "0.8", "weekly"),
         ("/docs/getting-started", "0.8", "weekly"),
         ("/docs/installation", "0.7", "weekly"),
@@ -744,3 +745,35 @@ def dashboard_undeprecate_tool(owner: str, name: str):
     data = request.get_json() or {}
     status, payload = _api_post(f"/api/v1/tools/{owner}/{name}/undeprecate", data=data, token=token)
     return jsonify(payload), status
+
+
+# ============================================
+# Collections Routes
+# ============================================
+
+@web_bp.route("/collections", endpoint="collections")
+def collections():
+    """List all available collections."""
+    status, payload = _api_get("/api/v1/collections")
+    if status != 200:
+        return render_template("errors/500.html"), 500
+    return render_template(
+        "pages/collections.html",
+        collections=payload.get("data", []),
+    )
+
+
+@web_bp.route("/collections/<name>", endpoint="collection_detail")
+def collection_detail(name: str):
+    """Show a specific collection with its tools."""
+    status, payload = _api_get(f"/api/v1/collections/{name}")
+    if status == 404:
+        return render_template("errors/404.html"), 404
+    if status != 200:
+        return render_template("errors/500.html"), 500
+
+    collection = payload.get("data", {})
+    return render_template(
+        "pages/collection_detail.html",
+        collection=collection,
+    )

src/cmdforge/web/templates/components/collection_card.html

@@ -0,0 +1,65 @@
+{# Collection card macro #}
+{% macro collection_card(collection) %}
+<article class="bg-white rounded-lg border border-gray-200 shadow-sm hover:shadow-md transition-shadow p-5">
+    <!-- Collection header -->
+    <div class="flex items-start space-x-4">
+        <div class="flex-shrink-0 w-12 h-12 bg-purple-100 rounded-lg flex items-center justify-center">
+            {% if collection.icon %}
+            <span class="text-2xl">{{ collection.icon }}</span>
+            {% else %}
+            <svg class="w-6 h-6 text-purple-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10"/>
+            </svg>
+            {% endif %}
+        </div>
+        <div class="flex-1 min-w-0">
+            <h3 class="text-lg font-semibold text-gray-900">
+                <a href="{{ url_for('web.collection_detail', name=collection.name) }}"
+                   class="hover:text-purple-600 transition-colors">
+                    {{ collection.display_name }}
+                </a>
+            </h3>
+            <p class="text-sm text-gray-500">by {{ collection.maintainer }}</p>
+        </div>
+    </div>
+
+    <!-- Description -->
+    <p class="mt-3 text-sm text-gray-600 line-clamp-2">
+        {{ collection.description or 'A curated collection of tools.' }}
+    </p>
+
+    <!-- Meta info -->
+    <div class="mt-4 flex items-center justify-between text-sm">
+        <span class="flex items-center text-purple-600">
+            <svg class="w-4 h-4 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M20 7l-8-4-8 4m16 0l-8 4m8-4v10l-8 4m0-10L4 7m8 4v10M4 7v10l8 4"/>
+            </svg>
+            {{ collection.tool_count }} tools
+        </span>
+        {% if collection.tags %}
+        <div class="flex flex-wrap gap-1">
+            {% for tag in collection.tags[:3] %}
+            <span class="px-2 py-0.5 bg-gray-100 text-gray-600 text-xs rounded">{{ tag }}</span>
+            {% endfor %}
+        </div>
+        {% endif %}
+    </div>
+
+    <!-- Install command -->
+    <div class="mt-4">
+        <div class="flex items-center bg-gray-100 rounded px-3 py-2 group">
+            <code class="text-xs text-gray-700 flex-1 truncate font-mono">
+                cmdforge install --collection {{ collection.name }}
+            </code>
+            <button type="button"
+                    onclick="copyToClipboard('cmdforge install --collection {{ collection.name }}')"
+                    class="ml-2 p-1 text-gray-400 hover:text-gray-600 opacity-0 group-hover:opacity-100 transition-opacity"
+                    aria-label="Copy install command">
+                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z"/>
+                </svg>
+            </button>
+        </div>
+    </div>
+</article>
+{% endmacro %}

src/cmdforge/web/templates/components/header.html

@@ -22,6 +22,10 @@
                    class="px-3 py-2 rounded-md text-sm font-medium hover:bg-slate-700 transition-colors {% if request.path.startswith('/tools') %}bg-slate-700{% endif %}">
                     Registry
                 </a>
+                <a href="{{ url_for('web.collections') }}"
+                   class="px-3 py-2 rounded-md text-sm font-medium hover:bg-slate-700 transition-colors {% if request.path.startswith('/collections') %}bg-slate-700{% endif %}">
+                    Collections
+                </a>
                 <a href="{{ url_for('forum.index') }}"
                    class="px-3 py-2 rounded-md text-sm font-medium hover:bg-slate-700 transition-colors {% if request.path.startswith('/forum') %}bg-slate-700{% endif %}">
                     Forum
@@ -119,6 +123,10 @@
                    class="block px-3 py-2 rounded-md text-base font-medium hover:bg-slate-700 {% if request.path.startswith('/tools') %}bg-slate-700{% endif %}">
                     Registry
                 </a>
+                <a href="{{ url_for('web.collections') }}"
+                   class="block px-3 py-2 rounded-md text-base font-medium hover:bg-slate-700 {% if request.path.startswith('/collections') %}bg-slate-700{% endif %}">
+                    Collections
+                </a>
                 <a href="{{ url_for('forum.index') }}"
                    class="block px-3 py-2 rounded-md text-base font-medium hover:bg-slate-700 {% if request.path.startswith('/forum') %}bg-slate-700{% endif %}">
                     Forum

src/cmdforge/web/templates/pages/collection_detail.html

@@ -0,0 +1,127 @@
+{% extends "base.html" %}
+{% from "components/tool_card.html" import tool_card %}
+
+{% block title %}{{ collection.display_name }} - CmdForge Collections{% endblock %}
+
+{% block meta_description %}{{ collection.description or 'A curated collection of AI-powered CLI tools.' }}{% endblock %}
+
+{% block content %}
+<div class="bg-gray-50 min-h-screen">
+    <!-- Collection Header -->
+    <div class="bg-white border-b border-gray-200">
+        <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+            <!-- Breadcrumb -->
+            <nav class="mb-4 text-sm text-gray-500">
+                <a href="{{ url_for('web.collections') }}" class="hover:text-indigo-600">Collections</a>
+                <span class="mx-2">/</span>
+                <span class="text-gray-900">{{ collection.display_name }}</span>
+            </nav>
+
+            <div class="flex items-start space-x-4">
+                <!-- Collection Icon -->
+                <div class="flex-shrink-0 w-16 h-16 bg-purple-100 rounded-lg flex items-center justify-center">
+                    {% if collection.icon %}
+                    <span class="text-3xl">{{ collection.icon }}</span>
+                    {% else %}
+                    <svg class="w-8 h-8 text-purple-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10"/>
+                    </svg>
+                    {% endif %}
+                </div>
+
+                <div class="flex-1">
+                    <h1 class="text-3xl font-bold text-gray-900">{{ collection.display_name }}</h1>
+                    <p class="mt-1 text-gray-500">
+                        Curated by <span class="font-medium text-gray-700">{{ collection.maintainer }}</span>
+                    </p>
+                    {% if collection.description %}
+                    <p class="mt-3 text-gray-600">{{ collection.description }}</p>
+                    {% endif %}
+                </div>
+            </div>
+
+            <!-- Tags -->
+            {% if collection.tags %}
+            <div class="mt-4 flex flex-wrap gap-2">
+                {% for tag in collection.tags %}
+                <span class="px-3 py-1 bg-purple-100 text-purple-700 text-sm rounded-full">{{ tag }}</span>
+                {% endfor %}
+            </div>
+            {% endif %}
+
+            <!-- Install Command -->
+            <div class="mt-6 p-4 bg-gray-900 rounded-lg">
+                <div class="flex items-center justify-between">
+                    <code class="text-green-400 font-mono">cmdforge install --collection {{ collection.name }}</code>
+                    <button type="button"
+                            onclick="copyToClipboard('cmdforge install --collection {{ collection.name }}')"
+                            class="ml-4 p-2 text-gray-400 hover:text-white transition-colors"
+                            aria-label="Copy install command">
+                        <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z"/>
+                        </svg>
+                    </button>
+                </div>
+                <p class="mt-2 text-sm text-gray-400">
+                    Installs {{ collection.tools|length if collection.tools else 0 }} tool{{ 's' if collection.tools|length != 1 else '' }} with a single command
+                </p>
+            </div>
+        </div>
+    </div>
+
+    <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+        <!-- Tools Section -->
+        <div class="mb-6">
+            <h2 class="text-xl font-semibold text-gray-900">
+                Tools in this Collection
+            </h2>
+            <p class="mt-1 text-sm text-gray-600">
+                {{ collection.tools|length if collection.tools else 0 }} tool{{ 's' if collection.tools|length != 1 else '' }} included
+            </p>
+        </div>
+
+        {% if collection.tools %}
+        <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
+            {% for tool in collection.tools %}
+            {% if tool.owner and tool.name %}
+            {{ tool_card(tool) }}
+            {% else %}
+            <!-- Tool not found in registry -->
+            <article class="bg-white rounded-lg border border-gray-200 border-dashed p-4 opacity-60">
+                <div class="flex items-start space-x-3">
+                    <div class="flex-shrink-0 w-10 h-10 bg-gray-100 rounded-full flex items-center justify-center">
+                        <svg class="w-5 h-5 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8.228 9c.549-1.165 2.03-2 3.772-2 2.21 0 4 1.343 4 3 0 1.4-1.278 2.575-3.006 2.907-.542.104-.994.54-.994 1.093m0 3h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/>
+                        </svg>
+                    </div>
+                    <div class="flex-1 min-w-0">
+                        <h3 class="text-lg font-semibold text-gray-500">{{ tool }}</h3>
+                        <p class="text-sm text-gray-400">Tool not yet in registry</p>
+                    </div>
+                </div>
+            </article>
+            {% endif %}
+            {% endfor %}
+        </div>
+        {% else %}
+        <div class="text-center py-12 bg-white rounded-lg border border-gray-200">
+            <svg class="mx-auto w-12 h-12 text-gray-300" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M20 7l-8-4-8 4m16 0l-8 4m8-4v10l-8 4m0-10L4 7m8 4v10M4 7v10l8 4"/>
+            </svg>
+            <h3 class="mt-4 text-lg font-medium text-gray-900">No tools in this collection</h3>
+            <p class="mt-2 text-gray-600">
+                This collection doesn't have any tools yet.
+            </p>
+        </div>
+        {% endif %}
+    </div>
+</div>
+
+<script>
+function copyToClipboard(text) {
+    navigator.clipboard.writeText(text).then(function() {
+        // Could add a toast notification here
+    });
+}
+</script>
+{% endblock %}

src/cmdforge/web/templates/pages/collections.html

@@ -0,0 +1,53 @@
+{% extends "base.html" %}
+{% from "components/collection_card.html" import collection_card %}
+
+{% block title %}Collections - CmdForge Registry{% endblock %}
+
+{% block meta_description %}Browse curated collections of AI tools. Install multiple tools at once with a single command.{% endblock %}
+
+{% block content %}
+<div class="bg-gray-50 min-h-screen">
+    <!-- Page Header -->
+    <div class="bg-white border-b border-gray-200">
+        <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+            <h1 class="text-3xl font-bold text-gray-900">Collections</h1>
+            <p class="mt-2 text-gray-600">
+                Curated groups of tools that work great together. Install an entire collection with a single command.
+            </p>
+        </div>
+    </div>
+
+    <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+        {% if collections %}
+        <!-- Results Header -->
+        <div class="flex items-center justify-between mb-6">
+            <p class="text-sm text-gray-600">
+                {{ collections|length }} collection{{ 's' if collections|length != 1 else '' }} available
+            </p>
+        </div>
+
+        <!-- Collections Grid -->
+        <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
+            {% for collection in collections %}
+            {{ collection_card(collection) }}
+            {% endfor %}
+        </div>
+        {% else %}
+        <!-- Empty State -->
+        <div class="text-center py-16">
+            <svg class="mx-auto w-16 h-16 text-gray-300" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10"/>
+            </svg>
+            <h3 class="mt-4 text-lg font-medium text-gray-900">No collections yet</h3>
+            <p class="mt-2 text-gray-600">
+                Collections are coming soon! They'll let you install groups of related tools together.
+            </p>
+            <a href="{{ url_for('web.tools') }}"
+               class="mt-6 inline-flex items-center px-4 py-2 text-sm font-medium text-white bg-indigo-600 rounded-md hover:bg-indigo-700">
+                Browse Individual Tools
+            </a>
+        </div>
+        {% endif %}
+    </div>
+</div>
+{% endblock %}

src/cmdforge/web/templates/pages/index.html

@@ -131,6 +131,29 @@
             </div>
             {% endfor %}
         </div>
+
+        <!-- Collections Callout -->
+        <div class="mt-12 p-6 bg-purple-50 rounded-lg border border-purple-100">
+            <div class="flex items-center justify-between">
+                <div class="flex items-center">
+                    <div class="w-12 h-12 bg-purple-100 rounded-lg flex items-center justify-center mr-4">
+                        <svg class="w-6 h-6 text-purple-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10"/>
+                        </svg>
+                    </div>
+                    <div>
+                        <h3 class="text-lg font-semibold text-gray-900">Tool Collections</h3>
+                        <p class="text-sm text-gray-600">Install curated groups of tools with a single command</p>
+                    </div>
+                </div>
+                <a href="{{ url_for('web.collections') }}" class="text-purple-600 hover:text-purple-800 font-medium flex items-center">
+                    Browse Collections
+                    <svg class="w-4 h-4 ml-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"/>
+                    </svg>
+                </a>
+            </div>
+        </div>
     </div>
 </section>
 

src/cmdforge/web/templates/pages/tool_detail.html

@@ -65,6 +65,25 @@
                         {% endfor %}
                     </div>
                     {% endif %}
+
+                    {% if tool.source %}
+                    <div class="mt-4 p-3 bg-amber-50 border border-amber-200 rounded-lg">
+                        <div class="flex items-center">
+                            <svg class="w-5 h-5 text-amber-600 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/>
+                            </svg>
+                            <span class="text-sm text-amber-800">
+                                Based on
+                                {% if tool.source_url %}
+                                <a href="{{ tool.source_url }}" target="_blank" rel="noopener" class="font-medium underline hover:text-amber-900">{{ tool.source }}</a>
+                                {% else %}
+                                <span class="font-medium">{{ tool.source }}</span>
+                                {% endif %}
+                                pattern
+                            </span>
+                        </div>
+                    </div>
+                    {% endif %}
                 </div>
 
                 <!-- Deprecation Warning -->