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Arcade MCP Server Framework

Quick Start: Create a New Server

# Install the CLI
uv tool install arcade-mcp
# Create a new server project
arcade new my_server
# Navigate to the project
cd my_server/src/my_server

#!/usr/bin/env python3
"""simple_server MCP server"""
import sys
from typing import Annotated
import httpx
from arcade_mcp_server import Context, MCPApp
from arcade_mcp_server.auth import Reddit
app = MCPApp(name="simple_server", version="1.0.0", log_level="DEBUG")
@app.tool
def greet(name: Annotated[str, "The name of the person to greet"]) -> str:
 """Greet a person by name."""
 return f"Hello, {name}!"
# To use this tool locally, you need to either set the secret in the .env file or as an environment variable
@app.tool(requires_secrets=["MY_SECRET_KEY"])
def whisper_secret(context: Context) -> Annotated[str, "The last 4 characters of the secret"]:
 """Reveal the last 4 characters of a secret"""
 # Secrets are injected into the context at runtime.
 # LLMs and MCP clients cannot see or access your secrets
 # You can define secrets in a .env file.
 try:
 secret = context.get_secret("MY_SECRET_KEY")
 except Exception as e:
 return str(e)
 return "The last 4 characters of the secret are: " + secret[-4:]
# To use this tool locally, you need to install the Arcade CLI (uv tool install arcade-mcp)
# and then run 'arcade login' to authenticate.
@app.tool(requires_auth=Reddit(scopes=["read"]))
async def get_posts_in_subreddit(
 context: Context, subreddit: Annotated[str, "The name of the subreddit"]
) -> dict:
 """Get posts from a specific subreddit"""
 # Normalize the subreddit name
 subreddit = subreddit.lower().replace("r/", "").replace(" ", "")
 # Prepare the httpx request
 # OAuth token is injected into the context at runtime.
 # LLMs and MCP clients cannot see or access your OAuth tokens.
 oauth_token = context.get_auth_token_or_empty()
 headers = {
 "Authorization": f"Bearer {oauth_token}",
 "User-Agent": "{{ toolkit_name }}-mcp-server",
 }
 params = {"limit": 5}
 url = f"https://oauth.reddit.com/r/{subreddit}/hot"
 # Make the request
 async with httpx.AsyncClient() as client:
 response = await client.get(url, headers=headers, params=params)
 response.raise_for_status()
 # Return the response
 return response.json()
# Run with specific transport
if __name__ == "__main__":
 # Get transport from command line argument, default to "stdio"
 # - "stdio" (default): Standard I/O for Claude Desktop, CLI tools, etc.
 # Supports tools that require_auth or require_secrets out-of-the-box
 # - "http": HTTPS streaming for Cursor, VS Code, etc.
 # Does not support tools that require_auth or require_secrets unless the server is deployed
 # using 'arcade deploy' or added in the Arcade Developer Dashboard with 'Arcade' server type
 transport = sys.argv[1] if len(sys.argv) > 1 else "stdio"
 # Run the server
 app.run(transport=transport, host="127.0.0.1", port=8000)

Running Your Server

# Run with stdio transport (default)
uv run server.py
# Run with http transport via command line argument
uv run server.py http
# Or use python directly
python server.py http
python server.py stdio

Configure MCP Clients

arcade configure claude # Configure Claude Desktop to connect to your stdio server in your current directory
arcade configure cursor --transport http --port 8080 # Configure Cursor to connect to your local HTTP server on port 8080
arcade configure vscode --entrypoint my_server.py # Configure VSCode to connect to your stdio server that will run when my_server.py is executed directly

Installing this Repo from Source

git clone https://github.com/ArcadeAI/arcade-mcp.git && cd arcade-mcp && make install

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