### What happened? The Replit auto‑merge put **two very different things in one file**: 1. **FastMCP server code** (`add / multiply / divide` tools) 2. **Client/Agent code** that is supposed to *call* those tools That hybrid script can’t work correctly: * The moment `mcp.run()` starts the SSE server loop, the code **after it never executes**, so the `Agent` you created would never run. * Even if it did, you’d be pointing the client back to *itself* on the same port—nothing useful. --- ### Correct separation | File | Role | Runs in its own process | |------|------|-------------------------| | **`math_server.py`** | Hosts the tools (`@mcp.tool()`), listens on :8000 | ✅ | | **`math_agent.py`** | Swarms `Agent` that talks to that server | ✅ | --- #### 1 . `math_server.py` – *server‑only* ```python # math_server.py from fastmcp import FastMCP import time mcp = FastMCP("Math‑Mock‑Server") @mcp.tool() def add(a: int, b: int) -> int: time.sleep(0.1) return a + b @mcp.tool() def multiply(a: int, b: int) -> int: time.sleep(0.1) return a * b @mcp.tool() def divide(a: int, b: int) -> float: if b == 0: raise ValueError("Cannot divide by zero") time.sleep(0.1) return a / b if __name__ == "__main__": print("🚀 Math MCP server on :8000") mcp.run(transport="sse", host="0.0.0.0", port=8000) ``` (`server.py` never imports `Agent` or `MCPServerSseParams`.) --- #### 2 . `math_agent.py` – *client/agent‑only* ```python # math_agent.py from swarms import Agent from swarms.tools.mcp_integration import MCPServerSseParams MATH_SERVER = MCPServerSseParams( url="http://127.0.0.1:8000", # no “/mcp” path required headers={"Content-Type": "application/json"}, ) agent = Agent( agent_name="Math-Processing-Agent", agent_description="Specialised agent for basic math ops", system_prompt=( "You can use the add, multiply and divide MCP tools " "to answer any arithmetic question." ), max_loops=1, mcp_servers=[MATH_SERVER], model_name="gpt-4o-mini", output_type="final", ) if __name__ == "__main__": answer = agent.run("Use the add tool to add 2 and 2") print("Agent replied ➜", answer) ``` --- ### How to run (locally or on Replit) ```bash # Terminal 1 (or first Replit tab) python math_server.py # Terminal 2 (second tab) python math_agent.py ``` Expected console: ``` 🚀 Math MCP server on :8000 Agent replied ➜ 4 ``` --- ### Key points to remember 1. **Never start an Agent in the same process that is serving MCP**—keep client and server separate. 2. `MCPServerSseParams.url` points to the **root** of the FastMCP server, not `/mcp`. 3. The Swarms base `Agent` already knows how to wrap the JSON‑RPC call; you only supply `mcp_servers=[…]`. Follow that structure, and your manager’s “initialize the agent like this” requirement is fully satisfied.