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mcp-agent-mesh

A mesh gateway for MCP — lets one MCP client reach N MCP servers with prefix-based routing, health checks, circuit-breaker failover, and a unified endpoint over both stdio and Streamable HTTP.

What it does

mcp-agent-mesh aggregates multiple upstream MCP servers behind a single logical MCP server. Every upstream tool is exposed under a server_name.tool_name prefix, so a client connecting to the mesh sees a single tools/list containing tools from all healthy upstreams.

When a tool call fails and the server's circuit breaker opens, the mesh automatically fails over to configured replica servers before returning an error to the client.

Related MCP server: mcp-0ne

Features

Feature

Description

Aggregation

tools/list merges every upstream server's tools into one flat list

Prefix routing

Call math.add and the mesh routes to the math server

Circuit breaker

Per-server circuit breaker with configurable threshold & timeout

Health polling

Background ping loop detects early upstream failures

Failover

Configurable failover groups let aliases take over for a failing server

Dual transport

Runs as a stdio MCP server and a Streamable HTTP server

Timeouts + retries

Every upstream call is wrapped in asyncio.wait_for

Architecture

                     ┌─────────────────────┐
  MCP client ───────►│   MeshGateway       │
                     │   (stdio / HTTP)    │
                     └────────┬───────────┘
                              │ tools/list
                              │ tools/call
                    ┌─────────┼─────────────┐
                    ▼         ▼             ▼
               ┌────────┐ ┌─────────┐ ┌─────────┐
               │ Server │ │ Server  │ │ Server  │
               │  "A"   │ │  "B"   │ │  "C"   │   (upstream MCP servers)
               └────────┘ └─────────┘ └─────────┘

Modules

Module

Responsibility

config.py

YAML config parsing — ServerConfig, MeshConfig

health.py

Per-server CircuitBreaker + ServerHealthMonitor (background ping)

router.py

Prefix routing (server.tool), failover group resolution, tool registry

gateway.py

MeshGateway — connects to upstreams, aggregates tool listings, routes calls, serves MCP over stdio + HTTP

Installation

pip install -e ".[dev]"

Usage

CLI (stdio mode)

mcp-agent-mesh --config examples/mesh.yaml --transport stdio

HTTP mode

mcp-agent-mesh --config examples/mesh.yaml --transport http --host 0.0.0.0 --port 8000

As a client config (Claude Code / Codex / OpenCode)

{
  "mcpServers": {
    "mesh": {
      "command": "mcp-agent-mesh",
      "args": ["--config", "/path/to/mesh.yaml", "--transport", "stdio"]
    }
  }
}
{
  "mcpServers": {
    "mesh": {
      "url": "http://127.0.0.1:8000/mcp"
    }
  }
}

Configuration

See examples/mesh.yaml for a full example. Key fields:

servers:
  - name: math            # tool-name prefix
    transport: stdio       # "stdio" or "http"
    command: python        # stdio: how to spawn
    args: ["-m", "..."]
    url: http://...        # http: endpoint URL
    timeout: 30.0
    circuit_breaker_threshold: 3
    circuit_breaker_timeout: 300.0

failover_groups:
  math: [math_backup]      # failover aliases for the "math" server

Testing

pytest tests/ -v

The test suite uses in-memory fake MCP servers (no real subprocesses required) and covers config parsing, circuit-breaker logic, prefix routing, tool aggregation, failover, and end-to-end gateway behaviour.

License

MIT

A
license - permissive license
Not graded
quality - not tested
C
maintenance

Maintenance

Maintainers
Response time
Release cycle
Releases (12mo)
Commit activity

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