MCP Server + AI Agent
Provides tools for fetching the current Bitcoin price in various currencies via the CoinGecko API.
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@MCP Server + AI AgentWhat's the weather in London?"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
MCP Server + AI Agent
A Python MCP server with JWT authentication and sample tools (weather + Bitcoin price), plus an AI agent that uses OpenAI to reason about and call those tools.
Architecture
User prompt → OpenAI GPT-4o (decides tool calls) → MCP Client → MCP Server (localhost:8000)
↑ ↓
└──────── tool results ──────────────┘MCP Server:
mcpPython SDK (FastMCP) + Starlette, Streamable HTTP atPOST /mcpAuth: HS256 JWT — self-signed tokens, validated by the server
Tools: Auto-discovered via MCP protocol — add tools to the server, agent sees them automatically
Agent: Interactive CLI that connects to the MCP server and uses OpenAI for reasoning
Related MCP server: Weather Service MCP
Project Structure
mcp-server/
├── pyproject.toml
├── Dockerfile
├── .env.example
├── .env ← your secrets (git-ignored)
├── scripts/
│ └── generate_token.py ← mint JWT tokens
├── src/ ← MCP Server
│ ├── __init__.py
│ ├── config.py ← loads env vars
│ ├── auth.py ← HS256 JWT verifier
│ ├── server.py ← FastMCP + Starlette app
│ └── tools/
│ ├── __init__.py
│ ├── weather.py ← Open-Meteo weather tool
│ └── crypto.py ← CoinGecko Bitcoin price tool
└── agent/ ← AI Agent
├── __init__.py
├── mcp_client.py ← connects to MCP server
├── llm.py ← OpenAI integration
└── main.py ← interactive CLIPrerequisites
Tool | Install |
Python 3.12+ |
|
uv (package manager) |
|
Docker (optional) | Docker Desktop for Mac |
Setup
1. Install dependencies
cd /path/to/mcp-server
uv syncThis installs all Python packages (mcp, httpx, pyjwt, uvicorn, openai, etc.) into a local .venv.
2. Create your .env file
cp .env.example .env3. Generate a JWT secret
openssl rand -hex 32Paste the output as JWT_SECRET in .env.
4. Generate a JWT token
uv run python scripts/generate_token.pyThis prints a JWT token valid for 30 days. Paste it as MCP_TOKEN in .env.
Options:
uv run python scripts/generate_token.py --sub amit --days 605. Add your API keys to .env
JWT_SECRET=<from step 3>
MCP_SERVER_URL=http://localhost:8000/mcp
MCP_TOKEN=<from step 4>
OPENAI_API_KEY=<your OpenAI API key>MCP Server
Start the server
uv run uvicorn src.server:app --port 8000The server runs at http://localhost:8000. Press Ctrl+C to stop.
Test the server
Health check
curl http://localhost:8000/healthExpected: {"status":"ok"}
Test unauthenticated access (should be blocked)
curl -s -w "\nHTTP %{http_code}\n" -X POST http://localhost:8000/mcp \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","method":"initialize","id":1,"params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}'Expected: 401 Unauthorized
Test authenticated access
TOKEN=$(uv run python scripts/generate_token.py)
# Initialize
curl -s -X POST http://localhost:8000/mcp \
-H "Authorization: Bearer $TOKEN" \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","method":"initialize","id":1,"params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}' | python3 -m json.toolExpected: JSON with protocolVersion, capabilities, and serverInfo.
List tools
curl -s -X POST http://localhost:8000/mcp \
-H "Authorization: Bearer $TOKEN" \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","method":"tools/list","id":2}' | python3 -m json.toolExpected: Two tools — get_weather and get_bitcoin_price with their input schemas.
Call the Bitcoin price tool
curl -s -X POST http://localhost:8000/mcp \
-H "Authorization: Bearer $TOKEN" \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","method":"tools/call","id":3,"params":{"name":"get_bitcoin_price","arguments":{"currency":"usd"}}}' | python3 -m json.toolExpected: Current Bitcoin price in USD.
Call the weather tool (needs API key)
curl -s -X POST http://localhost:8000/mcp \
-H "Authorization: Bearer $TOKEN" \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","method":"tools/call","id":4,"params":{"name":"get_weather","arguments":{"city":"London"}}}' | python3 -m json.toolThe weather tool uses the free Open-Meteo API — no API key required.
AI Agent
The agent connects to the MCP server, auto-discovers tools, and uses OpenAI GPT-4o to decide when to call them.
Run the agent
Make sure the MCP server is running first (in a separate terminal), then:
uv run python -m agent.mainExpected output:
Connecting to MCP server...
Connected to: MCP Server v1.26.0
Available tools: get_weather, get_bitcoin_price
Type your question (or 'quit' to exit):Example prompts
Prompt | What happens |
| Agent calls |
| Agent calls |
| Agent calls |
| Agent answers directly — no tool call |
| Exits the agent |
Tool calls are visible in real time:
You: What's the Bitcoin price?
→ Calling get_bitcoin_price({"currency": "usd"})
← Result received
Assistant: Bitcoin is at $70,487 USD, up 3.3% in the last 24h.MCP Inspector (Debugging UI)
MCP Inspector is the official interactive debugging tool for MCP servers. It provides a web UI to connect, list tools, call them, and inspect raw JSON-RPC messages.
Launch the Inspector
No install needed — run it directly with npx:
npx @modelcontextprotocol/inspectorThis opens a web UI at http://localhost:6274.
Connect to Your Server
Transport Type: Select Streamable HTTP
URL:
http://localhost:8000/mcpAuthentication: Add a header:
Header Name:
AuthorizationHeader Value:
Bearer <your MCP_TOKEN from .env>
Important: The token value must start with
Bearer(with a space) followed by your JWT token.
Click Connect
What You Can Do
List Tools — view all registered tools (
get_weather,get_bitcoin_price, etc.)Call Tools — fill in arguments and execute tool calls interactively
Inspect Messages — view raw JSON-RPC request/response traffic
Test Auth — verify your JWT tokens are working correctly
Stop the Inspector
Press Ctrl+C in the terminal where the inspector is running.
Docker (Optional)
Build and run
docker build -t mcp-server .
docker run -p 8000:8000 --env-file .env mcp-serverThis builds a container image and runs the server on port 8000. The --env-file .env passes your secrets into the container.
Test
Same curl commands as above — the server is at http://localhost:8000.
Expose to Internet (Optional)
Cloudflare Tunnel (no account needed)
brew install cloudflared
cloudflared tunnel --url http://localhost:8000This gives you a public https://*.trycloudflare.com URL. No signup required. Stop with Ctrl+C.
Cloud Run (Google Cloud)
gcloud run deploy mcp-server --source . --allow-unauthenticatedOne command deploy. Tear down with:
gcloud run services delete mcp-serverAdding New Tools
Create a new file in
src/tools/(e.g.src/tools/my_tool.py)Write an async function with type hints and a docstring:
async def my_tool(param: str) -> dict:
"""Description shown to the LLM."""
return {"result": "..."}Register it in
src/server.py:
from src.tools.my_tool import my_tool
mcp.tool()(my_tool)Restart the server — the agent auto-discovers the new tool on next startup.
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