MCP Gateway
A standalone CLI gateway that aggregates multiple MCP (Model Context Protocol) servers behind a single HTTP/SSE endpoint with Code Mode — reducing LLM input token usage by up to 92% when using multiple MCP servers.
Features
- Multi-Server Aggregation — Connect to multiple MCP servers (HTTP, SSE, Stdio, Streamable HTTP) and expose them through a single endpoint
- Code Mode — 4 meta-tools that let LLMs discover and use tools dynamically without loading all schemas upfront
- OAuth 2.0 Support — Built-in OAuth flow with dynamic client registration (RFC 7591) and token storage
- Hermetic Sandbox — Starlark-based sandbox for safe code execution
- MCP Protocol Compliant — Works with Claude Desktop, Cursor, and any MCP-compatible client
Installation
pip install mcp-gway
Or with mise:
mise install
uv sync
Quick Start
# Add an MCP server
mcp-gway add youtube --type http --url http://localhost:3001/mcp
# Add a stdio server
mcp-gway add filesystem --type stdio --command npx --args '["-y", "@anthropic/mcp-filesystem"]'
# Add a server requiring OAuth
mcp-gway add supabase --type streamable-http --url https://mcp.supabase.com/mcp
# List all servers
mcp-gway list
# Start the gateway
mcp-gway serve --port 8080
Connect from Claude Desktop
Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json):
{
"mcpServers": {
"gateway": {
"url": "http://localhost:8080/mcp"
}
}
}
Commands
| Command | Description |
|---|---|
mcp-gway add |
Add an MCP server and generate .pyi stub |
mcp-gway remove |
Remove an MCP server |
mcp-gway update |
Update tools for a server |
mcp-gway list |
List all connected servers |
mcp-gway inspect |
Show tool signatures for a server |
mcp-gway refresh |
Refresh connection and re-discover tools |
mcp-gway serve |
Start the gateway server |
Code Mode
When connected, the gateway exposes 4 meta-tools:
| Tool | Description |
|---|---|
listToolFiles |
List all available .pyi stub files |
readToolFile |
Read function signatures from a stub |
getToolDocs |
Get detailed documentation for a tool |
executeToolCode |
Execute code in a sandboxed Starlark interpreter |
OAuth Authentication
For servers requiring OAuth (e.g., Supabase):
# Trigger OAuth flow
mcp-gway refresh supabase --auth
# Or store token manually
mkdir -p ~/.config/mcp-gway/tokens
echo '{"access_token": "YOUR_TOKEN"}' > ~/.config/mcp-gway/tokens/supabase.json
Development
# Install dependencies
mise install
uv sync
# Run tests
uv run pytest -v
# Lint and format
uv run ruff check src/ tests/
uv run ruff format src/ tests/
Architecture
┌─────────────────────────────────────────────────────────┐
│ MCP Gateway │
├─────────────────────────────────────────────────────────┤
│ CLI (click) │ HTTP/SSE Server (Starlette) │
│ - add │ - POST /mcp (JSON-RPC) │
│ - remove │ - GET /mcp (SSE stream) │
│ - list │ - POST /mcp/messages │
│ - refresh │ │
├─────────────────────────────────────────────────────────┤
│ Code Mode (4 meta-tools) │ Starlark Sandbox │
│ - listToolFiles │ - Hermetic execution │
│ - readToolFile │ - Server injection │
│ - getToolDocs │ │
│ - executeToolCode │ │
├─────────────────────────────────────────────────────────┤
│ Registry (.pyi files) │ OAuth2 (RFC 7591) │
│ - servers/*.pyi │ - Dynamic registration│
│ - Tool signatures │ - Token storage │
└─────────────────────────────────────────────────────────┘
│ │ │
┌────┴────┐ ┌────┴────┐ ┌────┴────┐
│ Server1 │ │ Server2 │ │ Server3 │
│ (HTTP) │ │ (SSE) │ │ (Stdio) │
└─────────┘ └─────────┘ └─────────┘
License
MIT
1 maintainer
Metadata
1 maintainer
Release files for mcp-gway 0.6.0
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Source distribution (sdist)
| File | Size | Uploaded | |
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| mcp_gway-0.6.0.tar.gz | 22.3 kB | Details |
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| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| mcp_gway-0.6.0-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 49.8 kB
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| Size | 22.3 kB |
| Tags | Source |
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