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Both stack‑traces come from very small compatibility issues in **your local copy** of the library.
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Fixing them just needs two tiny edits.
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---
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## 1 `'Agent' object has no attribute 'mcp_servers'`
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`Agent.__init__()` used to take `mcp_servers`, but in your checkout that
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parameter line is commented out:
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```python
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# mcp_servers: List[MCPServerSseParams] = [],
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```
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Yet `handle_tool_init()` still refers to `self.mcp_servers`, so the
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attribute is missing when the object is created.
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### Patch
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```diff
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@@ class Agent:
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- # mcp_servers: List[MCPServerSseParams] = [],
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+ mcp_servers: Optional[list] = None, # list[MCPServerSseParams]
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@@ def __init__(...):
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- self.tools_list_dictionary = tools_list_dictionary
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- # self.mcp_servers = mcp_servers
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+ self.tools_list_dictionary = tools_list_dictionary
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+ self.mcp_servers = mcp_servers
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```
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> *Nothing else has to change; the `exists(self.mcp_servers)` check will now
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> work, and you can pass `mcp_servers=[server_one]` from your smoke‑test.*
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---
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## 2 `ImportError: cannot import name 'NotRequired' from typing`
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`typing.NotRequired` only exists in **Python ≥ 3.11**.
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On 3.10 you have to import it from **`typing_extensions`**.
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The top of `swarms/tools/mcp_integration.py` currently has:
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```python
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from typing import Any, Dict, List, Optional, TypedDict, NotRequired
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```
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### Patch
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```diff
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-from typing import Any, Dict, List, Optional, TypedDict, NotRequired
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+from typing import Any, Dict, List, Optional
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+from typing_extensions import NotRequired, TypedDict
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```
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(There is already a `typing_extensions` import later, so you can simply reuse
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it and remove `NotRequired` from the `typing` line.)
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> Make sure the wheel `typing‑extensions` is installed:
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> ```bash
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> pip install -U typing_extensions
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> ```
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---
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### After the fixes
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Your smoke‑test script should run:
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```python
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from swarms.tools.mcp_integration import MCPServerSseParams
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from swarms.prompts.agent_prompts import MATH_AGENT_PROMPT
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from swarms import Agent
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server_one = MCPServerSseParams(
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url="http://127.0.0.1:6274",
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headers={"Content-Type": "application/json"},
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)
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agent = Agent(
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agent_name="Math‑Tester",
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agent_description="Does arithmetic via MCP add tool",
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system_prompt=MATH_AGENT_PROMPT,
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max_loops=1,
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mcp_servers=[server_one],
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output_type="final",
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)
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print(agent.run("Use the add tool to add 2 and 2"))
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```
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---
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**Summary**
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* add the `mcp_servers` parameter back into `Agent.__init__`
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* import `NotRequired` from `typing_extensions`, not `typing`
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After these two edits the “attribute missing” and “ImportError” messages
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disappear and the agent can reach the MCP server for your smoke‑test. |
