MCP Gateway
One endpoint for every MCP server your agent needs — fetch tool schemas on demand instead of loading everything upfront.
MCP Gateway aggregates multiple MCP servers behind a single headless HTTP/SSE endpoint. Its Code Mode exposes four meta-tools (listToolFiles, readToolFile, getToolDocs, executeToolCode) so agents discover signatures lazily and execute them in a hermetic Starlark sandbox.
- CLI:
mcp-gway(canonical) ormgw(alias) - Admin UI:
mcp-gway serve --transport http→ http://127.0.0.1:8080/
Why MCP Gateway
- Fewer wasted tokens — Agents fetch only the schemas they need, when they need them.
- One connection to manage — Add, remove, or refresh servers in a single registry; agents connect to one endpoint.
- Safe local-first defaults — Binds to
127.0.0.1by default, screens local commands via an allowlist, masks secrets, and CSRF-protects the admin dashboard.
Who It's For
- Agent developers wiring Pi, Antigravity, Claude Desktop, Cursor, or any MCP-compatible client to multiple MCP servers through one gateway.
- Operators running local-first infrastructure who want a CLI and dashboard with health probes, Prometheus metrics, and structured JSON logs.
Quick Start
- Install:
pip install mcp-gway - Add a server:
mcp-gway add files --type local --command "npx -y @modelcontextprotocol/server-filesystem /path/to/dir" - List servers:
mcp-gway list - Serve HTTP:
mcp-gway serve --transport http - Connect: Point your agent to
http://127.0.0.1:8080/mcp
For more examples and transports, see the CLI Reference and Integrations.
Features
- Multi-Server Aggregation — Connect to multiple MCP servers (local or remote) and expose them through a single endpoint. One URL for every agent; one registry to manage.
- Code Mode — Four meta-tools let LLMs discover schemas on demand and execute them in a hermetic sandbox, avoiding the need to load all tool definitions upfront.
- OAuth 2.0 Support — Built-in OAuth flow with Dynamic Client Registration (RFC 7591) and secure token storage.
- Hermetic Sandbox — Starlark-based sandbox for safe, constrained code execution.
- MCP Protocol Compliant — Implements the Model Context Protocol over HTTP, SSE, and stdio.
- Local-First Security — Local-first design with SSRF guards, command allow-lists, and CSRF protection.
- Built-In Observability — Structured JSON logs, Prometheus metrics, and health probes built in.
Documentation
- Configuration & Usage — add servers, transports, and OAuth
- CLI Reference — commands, options, and the admin dashboard
- Code Mode — lazy-discovery meta-tools and the sandbox
- Security — local-first controls and command allow-lists
- Observability — JSON logs, Prometheus metrics, health probes
- Integrations — Claude Desktop, Pi, Antigravity, OpenCode
- Architecture — system diagram and transports
- Development — tests, lint, and pre-commit
Development
uv sync --all-groups
uv run pytest -v # 647 tests
See docs/development.md for checks, probes, and pre-commit.
License
1 maintainer
Metadata
1 maintainer
Release files for mcp-gway 4.8.0
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