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GemmaJnana

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MCP Skills

A lightweight, robust, and decoupled CLI/Agent framework demonstrating progressive disclosure of Agent Skills over the Model Context Protocol (MCP).

This project implements a complete local agentic loop that communicates with a backend MCP server using stdio transport. It enables the agent to discover tools and fetch complex instructions (skills) dynamically and on-demand only when relevant.

🗺️ Obsidian Vault Map

Quickly navigate the documentation inside Obsidian:

  • 🏠 Home (README): [[README]]

  • 📖 Layman's Guide: [[LAYMAN_GUIDE|A Layman's Guide to MCP Skills]]

  • ⚙️ System Flow & Walkthrough: [[FLOW|How it works — an end-to-end walkthrough]]

  • 🏴‍☠️ Example Skill: [[skills/pirate-speak/SKILL|Pirate Speak Skill (SKILL.md)]]

Related MCP server: Forage MCP Server

Key Features

  • Decoupled Architecture: Process A (CLI/Agent) communicates with Process B (MCP Server) strictly via JSON-RPC over the Model Context Protocol. No importing of server tools or skill loader logic in the agent.

  • Progressive Skill Disclosure: The agent first lists metadata (names and descriptions) of available skills cheaply and only pulls the token-heavy instructions when the LLM determines the skill is relevant.

  • AST-based Calculator: A safe math evaluation tool restricting execution to basic numbers and arithmetic operations, fully protected against remote code execution.

  • Robust Local Testing: Built-in rule-based and scripted DummyClient allowing deterministic, offline testing of multi-step agent behaviors without needing LLM API keys.

  • Real LLM Integration: Seamless toggle to real OpenAI-compatible endpoints using environment configuration.

  • Modern Package Layout: Structured clean package layout using a Click-based CLI and pyproject.toml setup.

System Architecture

graph LR
    subgraph CLI_PROC["Process A — CLI / Agent"]
        CLI["cli.py<br/>run command"]
        AG["Agent<br/>ReAct Loop"]
        LLM["LLMClient<br/>(Dummy / OpenAI)"]
        MC["MCPClient<br/>(stdio client)"]
        CLI --> AG
        AG --> LLM
        AG --> MC
    end

    subgraph SRV_PROC["Process B — MCP Server"]
        SRV["FastMCP Server<br/>app.py"]
        TOOLS["Tools<br/>calculator, echo"]
        SKILLS["Skills<br/>list_skills / load_skill<br/>+ prompts"]
        SRV --> TOOLS
        SRV --> SKILLS
    end

    MC <-->|"MCP stdio<br/>(JSON-RPC on stdin/stdout)"| SRV
    LLM -.->|"OpenAI Chat API"| EXT["LLM API Endpoint"]

Project Layout

mcp-skills-new/
├── pyproject.toml              # Build backend and dependencies config
├── FLOW.md                     # Walkthrough explaining how the framework runs
├── README.md                   # This overview file
├── skills/                     # Builtin skills catalog
│   └── pirate-speak/
│       └── SKILL.md            # Pirate-speak instructions with frontmatter
├── src/
│   └── mcp_skills/
│       ├── __init__.py
│       ├── cli.py              # Click commands entry point
│       ├── config.py           # Configuration parser settings
│       ├── agent/              # CLI Agent components
│       │   ├── __init__.py
│       │   ├── agent.py        # ReAct orchestration loop
│       │   ├── mcp_client.py   # MCP stdio client wrapper
│       │   └── prompts.py      # System prompts
│       ├── llm/                # LLM connectors (Dummy & OpenAI)
│       │   ├── __init__.py
│       │   ├── base.py
│       │   ├── dummy.py
│       │   └── openai_client.py
│       └── server/             # Stdio/SSE MCP server
│           ├── __init__.py
│           ├── __main__.py
│           ├── app.py          # FastMCP server wiring
│           ├── skills/         # Skill markdown loader
│           │   ├── __init__.py
│           │   ├── loader.py
│           │   └── models.py
│           └── tools/          # Registry and builtin tools
│               ├── __init__.py
│               ├── base.py
│               ├── registry.py
│               └── builtins.py
└── tests/                      # 18 pytest unit/integration tests
TIP

Obsidian Navigation Tip: You can open and edit key files directly inside Obsidian using these links:

  • [[FLOW]] — Detailed technical walkthrough of the ReAct agent loop and the stdio communication.

  • [[LAYMAN_GUIDE]] — High-level, developer-friendly overview with analogies.

  • [[skills/pirate-speak/SKILL]] — The example skill instruction template.

Installation

Install the package and its development dependencies in editable mode:

python3 -m pip install -e ".[dev]"

Usage

1. Run the Agent Loop

Trigger the agent to answer questions. It will spawn the stdio MCP server subprocess automatically, inspect active tools, reason through steps, call appropriate tools, and return a summary.

Math execution (uses AST calculator tool):

mcp-skills run "what is 6 * 7?"

Skills discovery & lazy loading:

mcp-skills run "what skills exist?"

2. Explore Discovered Skills via CLI

Explore loaded skill templates without starting the agent loop:

mcp-skills skills list

3. Run Standalone MCP Server

Start a raw MCP server listening on stdin/stdout:

mcp-skills serve

Inspect tools and prompts interactively via the MCP Inspector:

npx @modelcontextprotocol/inspector mcp-skills serve

Running with a Real LLM

To switch from the offline DummyClient to a real model, create a .env file in the project root:

MCP_SKILLS_LLM_PROVIDER=openai
MCP_SKILLS_MODEL=gpt-4o-mini
MCP_SKILLS_OPENAI_BASE_URL=https://api.openai.com/v1
MCP_SKILLS_OPENAI_API_KEY=your-api-key-here

Running Tests

Execute the test suite to run 18 offline verification checks:

pytest -v

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