fix: fix loading tools with same tool name

[JackYPCOnline]

Description

fix duplicate tool names, throw Value Erro while tools have same name, except tool.support_hot_reload is true.

Related Issues

#715

Documentation PR

Type of Change

Bug fix
New feature
Breaking change
Documentation update
Other (please describe):

Testing

test with aws mcp server.

stdio_mcp_client = MCPClient(lambda: stdio_client(
    StdioServerParameters(
        command="uvx",
        args=["awslabs.aws-documentation-mcp-server@latest"]
    )
))

@tool
def read_documentation():
    return ""

test_tool = None

with stdio_mcp_client:
    for tool in stdio_mcp_client.list_tools_sync():
        if tool.tool_name == "read_documentation":
            test_tool = tool
  
    agent = Agent(tools=[read_documentation,test_tool])
    print(agent.tool_names)

[08/29/25 15:32:47] INFO     Processing request of type ListToolsRequest                                                                                                                                                                                                                                    server.py:624
Jack need your name: read_documentation
Traceback (most recent call last):
  File "/Volumes/workplace/Strands/personal/agent.py", line 30, in <module>
    agent = Agent(tools=[read_documentation,test_tool])
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Volumes/workplace/Strands/sdk-python/src/strands/agent/agent.py", line 312, in __init__
    self.tool_registry.process_tools(tools)
  File "/Volumes/workplace/Strands/sdk-python/src/strands/tools/registry.py", line 108, in process_tools
    add_tool(a_tool)
  File "/Volumes/workplace/Strands/sdk-python/src/strands/tools/registry.py", line 98, in add_tool
    self.register_tool(tool)
  File "/Volumes/workplace/Strands/sdk-python/src/strands/tools/registry.py", line 196, in register_tool
    raise ValueError(f"Tool name '{tool.tool_name}' already exists. "
ValueError: Tool name 'read_documentation' already exists. Cannot register tools with exact same name.

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• [x ] I ran hatch run prepare

Checklist

• [ x] I have read the CONTRIBUTING document
• [ x] I have added any necessary tests that prove my fix is effective or my feature works
• [ x] I have updated the documentation accordingly
• [ x] I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• [x ] My changes generate no new warnings
• [x ] Any dependent changes have been merged and published

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.