mcp-skill-creator

name

mcp-skill-creator

description

Meta-skill for creating workflow-optimized skills from MCP servers. Use when users want to create a custom skill that integrates one or more MCP servers into a specialized workflow. The user provides MCP server configurations and describes their work scenario (workflow, preferences, SOPs), and this skill generates a new skill with optimized scripts following Anthropic's MCP + code execution best practices.

MCP-Powered Skill Creator

This meta-skill creates workflow-optimized skills from MCP servers using code execution patterns inspired by Anthropic's MCP engineering practices.

Core Concept

Transform MCP servers into specialized, personalized workflow skills by:

1. Progressive Disclosure: Generate code APIs for MCP tools, loaded on-demand (not all upfront)
2. Context Efficiency: Process data in execution environment, minimize token usage
3. Workflow Optimization: Combine MCP calls with parallel execution, filtering, control flow
4. Personalization: Embed user preferences, SOPs, and domain knowledge into the skill

When to Use This Skill

Use this skill when a user wants to:

• Create a custom skill from one or more MCP servers
• Optimize a workflow that involves multiple MCP tool calls
• Build reusable automation scripts for specific work scenarios
• Capture personal SOPs and preferences into a skill

⚠️ IMPORTANT: Before You Start

ALWAYS check and install dependencies FIRST before doing anything else:

python3 -c "import mcp; print('✓ MCP SDK is installed')" 2>/dev/null || pip3 install mcp --break-system-packages

Automatic Installation Process:

1. First, check if MCP SDK is installed
2. If not installed, automatically install it using pip3 install mcp --break-system-packages
3. Verify installation succeeded before continuing
4. Then proceed with skill creation

DO NOT ask the user to manually install dependencies - you should handle this automatically as part of the skill creation process.

Why this matters: The introspector and generated scripts require the mcp package. Installing it upfront ensures a smooth workflow.

Skill Creation Process

Follow these steps to create an MCP-powered skill. This process combines programmatic MCP infrastructure generation with LLM-driven skill design, following skill-creator principles.

Overview of Steps

0. Prerequisites - Install required dependencies
1. Gather Input - Collect MCP servers and workflow description from user
2. Generate MCP Infrastructure - Use scripts to introspect servers and create wrappers (programmatic)
3. Understand the Workflow - Analyze user's scenario with concrete examples (LLM-driven)
4. Plan Skill Contents - Determine what scripts, references, and guidance to include (LLM-driven)
5. Implement the Skill - Write workflow scripts and SKILL.md with embedded preferences (LLM-driven)
6. Package and Deliver - Create distributable .skill file

Step 0: Prerequisites (Automatic)

You should automatically check and install the MCP SDK if needed:

python3 -c "import mcp; print('✓ MCP SDK is installed')" 2>/dev/null || pip3 install mcp --break-system-packages

Process:

1. Check if MCP SDK is already installed
2. If not, install it automatically with pip3 install mcp --break-system-packages
3. Verify installation succeeded
4. Inform the user that dependencies have been installed

Why needed: The introspector and generated scripts use the mcp package to connect to MCP servers.

DO NOT ask the user to manually install - handle this automatically as part of the workflow.

Step 1: Gather Input

Before starting, collect the following from the user:

MCP Server Configurations (required):

{
  "mcp_servers": [
    {
      "name": "server-name",
      "command": ["npx", "-y", "@modelcontextprotocol/server-..."]
    }
  ]
}

Workflow Description (required):

• Clear description of the workflow steps
• Can be numbered list, sequential narrative, or structured steps
• Example: "First I visit the official website, then check ProductHunt, then search Twitter/Reddit, finally generate a report"

User Preferences (optional):

• How they like to work
• What data they prioritize
• Quality standards
• Example: "I prefer quantitative metrics over qualitative descriptions"

Standard Operating Procedures (optional):

• Company-specific practices
• Domain knowledge
• Best practices
• Example: "Always verify information from at least 3 sources"

If user provides a single configuration file, parse it to extract these components.

Step 2: Generate MCP Infrastructure (Programmatic)

This step generates the MCP client infrastructure and tool discovery utilities.

2.1 Introspect MCP Servers

Use scripts/mcp_introspector.py to discover available tools:

# Create MCP config file in skill directory
echo '{
  "servers": [
    {
      "name": "filesystem",
      "command": ["npx", "-y", "@modelcontextprotocol/server-filesystem", "/path/to/dir"]
    }
  ]
}' > <skill-dir>/mcp_config.json

# Run introspection
python scripts/mcp_introspector.py <skill-dir>/mcp_config.json introspection.json

This produces a JSON file with all available tools, their parameters, and descriptions.

2.2 Generate MCP Client and Tool Discovery

Use scripts/generate_mcp_wrappers.py to create the infrastructure:

python scripts/generate_mcp_wrappers.py introspection.json <skill-dir>

This creates:

• scripts/mcp_client.py - Working MCP client with proper connection management
• scripts/list_mcp_tools.py - Dynamic tool discovery (Progressive Disclosure)
• scripts/tools/<server>/ - (Optional) Type-safe wrappers for each tool

Generated structure:

<skill-dir>/
├── mcp_config.json           # Server configuration
├── scripts/
│   ├── mcp_client.py         # ✅ Working implementation
│   ├── list_mcp_tools.py     # 🆕 View tool docs on-demand
│   └── workflows/            # (You'll create these)
│       └── your_workflow.py

2.3 How to View MCP Tool Documentation

Progressive Disclosure means tools are discovered on-demand, not pre-loaded. Three ways to view docs:

1. Dynamic Query (Recommended):

   cd <skill-dir>/scripts
   python list_mcp_tools.py
   

   Shows all available tools with parameters and descriptions.

2. Generate Static Reference:

   python list_mcp_tools.py > references/mcp_tools_reference.txt
   

   Save for offline reference.

3. In SKILL.md: List only the most commonly used tools, full docs available via method 1 or 2.

Key Insight: You don't need wrapper files for each tool. Just use call_mcp_tool() directly:

from mcp_client import call_mcp_tool

result = await call_mcp_tool('filesystem', 'search_files', {
    'path': '/path',
    'pattern': 'myfile'
})

Step 3: Understand the Workflow (LLM-Driven)

Now analyze the user's workflow description to understand what this skill needs to accomplish. Similar to skill-creator's Step 1.

Ask clarifying questions if needed:

• "What specific data sources do you use?"
• "How do you handle cases where data is missing?"
• "What does the final output look like?"
• "Are there any steps that must happen sequentially vs in parallel?"

Identify workflow characteristics:

• Which steps are data fetching operations (candidates for parallelization)
• Which steps are data processing (candidates for execution environment filtering)
• Which steps have complex control flow (loops, conditionals, polling)
• What intermediate state needs to be preserved

Example Analysis:

User says: "I research products by checking the official site, ProductHunt, Twitter, and Reddit, then create a report"

Analysis:

• 4 data fetch operations (parallel opportunity)
• 1 aggregation step (data filtering opportunity)
• 1 output generation (report creation)
• Sequential dependency: Fetch all → Aggregate → Generate report

Step 4: Plan Skill Contents (LLM-Driven)

Based on the workflow analysis, determine what to include in the skill. Follow skill-creator principles.

4.1 Decide on Scripts vs Guidance

Create scripts when:

• Same code would be rewritten repeatedly
• Complex workflow with multiple MCP calls
• Parallel execution can improve performance
• Data filtering reduces context usage significantly
• Polling/monitoring patterns

Use text guidance when:

• Workflow varies significantly each time
• Simple single-tool operations
• User needs flexibility in approach
• Context helps more than code

4.2 Plan Script Structure

For each workflow script to create, determine:

Script purpose: What part of the workflow does it handle?

MCP tools needed: Which tools from which servers?

Optimization patterns:

• Parallel execution: asyncio.gather() for independent fetches
• Data filtering: Process in execution environment before returning
• Control flow: Loops, conditionals, error handling
• State persistence: Save intermediate results to filesystem

Parameters: What inputs does the script need?

Output: What does it return? (Prefer summaries over full data)

4.3 Plan SKILL.md Structure

Determine what goes in SKILL.md:

Essential:

• Workflow overview (user's mental model)
• When to use each script
• User preferences (embedded as guidance)
• SOPs (embedded as procedural instructions)
• Available MCP tools (reference, not full docs)

Optional references/:

• Detailed MCP tool catalog
• Complex schemas or API documentation
• Additional examples
• Troubleshooting guides

Step 5: Implement the Skill (LLM-Driven)

Now create the actual skill files. This is where you write code and documentation.

5.1 Write Workflow Scripts

For each planned script, create scripts/workflows/<script_name>.py:

Follow these patterns from Anthropic's MCP best practices:

Pattern 1: Parallel Fetch + Aggregate

async def research_pipeline(product_url: str, product_name: str) -> dict:
    """Complete research workflow with parallel data gathering"""
    
    # Parallel fetch from multiple sources
    official_task = google_devtools.fetch_page(product_url)
    twitter_task = x_com.search_tweets(f'"{product_name}"')
    reddit_task = reddit.search_discussions(product_name)
    
    # Execute concurrently (3x faster than sequential)
    official, twitter, reddit = await asyncio.gather(
        official_task, twitter_task, reddit_task
    )
    
    # Filter and aggregate in execution environment
    # (keeps raw data out of context)
    key_features = extract_features(official, top_n=10)
    sentiment = analyze_sentiment([twitter, reddit])
    highlights = extract_highlights(twitter + reddit, top_n=5)
    
    # Return summary (not full data)
    return {
        'key_features': key_features,
        'sentiment': sentiment,
        'highlights': highlights,
        'source_count': len(twitter) + len(reddit)
    }

Pattern 2: Polling/Monitoring

async def wait_for_deployment(channel: str, keyword: str, timeout: int = 300):
    """Poll Slack channel for deployment completion"""
    start = time.time()
    
    while time.time() - start < timeout:
        messages = await slack.get_channel_history(channel, limit=10)
        
        if any(keyword in m['text'].lower() for m in messages):
            return {'status': 'complete', 'message': messages[0]}
        
        await asyncio.sleep(10)
    
    return {'status': 'timeout'}

Pattern 3: Bulk Processing

async def sync_contacts(sheet_id: str, crm_object: str):
    """Sync contacts from sheet to CRM (privacy-preserving)"""
    
    # Load data once
    contacts = await google_sheets.get_sheet(sheet_id)
    
    # Filter in execution environment (not in context)
    valid = [c for c in contacts if validate_email(c['email'])]
    
    # Batch update (PII never enters model context)
    results = []
    for batch in chunked(valid, batch_size=50):
        batch_results = await asyncio.gather(*[
            crm.update_record(crm_object, contact)
            for contact in batch
        ])
        results.extend(batch_results)
    
    # Return summary only
    return {
        'processed': len(valid),
        'successful': sum(1 for r in results if r['success'])
    }

Key Principles for Scripts:

• Use async/await for IO-bound MCP calls
• Combine related operations into single scripts
• Filter/aggregate data before returning to model
• Return summaries, not raw data
• Include type hints and docstrings
• Add helper functions for data processing

5.2 Write SKILL.md

Create the SKILL.md following skill-creator structure, with MCP-specific additions.

YAML Frontmatter:

---
name: <skill-name>
description: <Brief description of workflow + when to use + MCP servers involved>
---

Body Structure:

# [Skill Name]

[Overview of what this skill does]

## Prerequisites

This skill requires the MCP SDK. **The scripts will automatically check and install it if needed.**

If you want to manually verify or install:

```bash
python3 -c "import mcp; print('✓ MCP SDK ready!')" 2>/dev/null || pip3 install mcp --break-system-packages

Why needed: This skill uses MCP tools to [brief explanation of what MCP servers do]. The workflow scripts require the mcp package to connect to MCP servers.

Note: When you run any workflow script, it will automatically check for MCP SDK and display a helpful error message if not installed.

Workflow Overview

[User's workflow steps in their own language]

[USER PREFERENCES - Embedded as guidance] When using this skill:

• [Preference 1]
• [Preference 2]

[SOPs - Embedded as procedural instructions] Standard procedure:

1. [SOP step 1]
2. [SOP step 2]

Quick Start

Before running workflows, ensure MCP SDK is installed (see Prerequisites above).

[Simple example of using the main workflow script]

Available Workflows

[Primary Workflow Script]

Use when: [Scenario]

Location: scripts/workflows/<script>.py

Usage:

from scripts.workflows import workflow_name
result = await workflow_name(params)

Optimizations:

• Parallel execution of [X] data sources
• Context-efficient data filtering
• [Other optimizations]

[Repeat for other workflow scripts]

MCP Tools Available

[Brief overview of integrated MCP servers]

[Server Name]

Tools: [Count] available

Location: scripts/tools/[server]/

Key tools: [List 3-5 most relevant]

Discovery: Use ls scripts/tools/[server]/ to see all tools

[Repeat for each server]

Advanced Usage

[Guidance on combining scripts, customization, etc.]

Performance Notes

[Context optimization benefits, speedups from parallelization]

**Critical**: Embed user preferences and SOPs directly into the workflow guidance, not as separate sections. They should inform HOW to use the skill.

**Example of embedded preferences**:
```markdown
## Workflow Overview

This skill automates product research with the following steps:

1. Official website analysis
2. Community feedback gathering
3. Report generation

**Research approach**: Always prioritize quantitative metrics (user counts, ratings) over qualitative descriptions. Recent information (last 6 months) is valued over older reviews. Cross-reference official claims against community feedback to identify contradictions.