ida_rename_function

Rename functions in IDA Pro databases to improve code readability and maintain reverse engineering workflows. Specify old and new function names to update the database.

Instructions

Rename a function in the IDA database

Input Schema

TableJSON Schema

Name	Required	Description	Default
`old_name`	Yes
`new_name`	Yes

Implementation Reference

plugin/ida_mcp_server_plugin/ida_mcp_core.py:400-433 (handler)

Core implementation of function renaming using IDA Pro API (ida_name.set_name). This is the actual logic executed in IDA Pro.

def rename_function(self, old_name: str, new_name: str) -> Dict[str, Any]:
    """Rename a function"""
    return self._rename_function_internal(old_name, new_name)
    
def _rename_function_internal(self, old_name: str, new_name: str) -> Dict[str, Any]:
    """Internal implementation for rename_function without sync wrapper"""
    try:
        # Get function address
        func_addr: int = ida_name.get_name_ea(0, old_name)
        if func_addr == idaapi.BADADDR:
            return {"success": False, "message": f"Function '{old_name}' not found"}
        
        # Check if it's a function
        func: Optional[ida_funcs.func_t] = ida_funcs.get_func(func_addr)
        if not func:
            return {"success": False, "message": f"'{old_name}' is not a function"}
        
        # Check if new name is already in use
        if ida_name.get_name_ea(0, new_name) != idaapi.BADADDR:
            return {"success": False, "message": f"Name '{new_name}' is already in use"}
        
        # Try to rename
        if not ida_name.set_name(func_addr, new_name):
            return {"success": False, "message": f"Failed to rename function, possibly due to invalid name format or other IDA restrictions"}
        
        # Refresh view
        self._refresh_view_internal()
        
        return {"success": True, "message": f"Function renamed from '{old_name}' to '{new_name}' at address {hex(func_addr)}"}
    
    except Exception as e:
        print(f"Error renaming function: {str(e)}")
        traceback.print_exc()
        return {"success": False, "message": str(e)}

src/mcp_server_ida/server.py:549-569 (handler)

MCP server-side handler that proxies the rename request to the IDA Pro plugin via socket communication.

def rename_function(self, old_name: str, new_name: str) -> str:
    """Rename a function"""
    try:
        response: Dict[str, Any] = self.communicator.send_request(
            "rename_function", 
            {"old_name": old_name, "new_name": new_name}
        )
        
        if "error" in response:
            return f"Error renaming function from '{old_name}' to '{new_name}': {response['error']}"
        
        success: bool = response.get("success", False)
        message: str = response.get("message", "")
        
        if success:
            return f"Successfully renamed function from '{old_name}' to '{new_name}': {message}"
        else:
            return f"Failed to rename function from '{old_name}' to '{new_name}': {message}"
    except Exception as e:
        self.logger.error(f"Error renaming function: {str(e)}", exc_info=True)
        return f"Error renaming function from '{old_name}' to '{new_name}': {str(e)}"

src/mcp_server_ida/server.py:968-972 (registration)

Registration of the 'ida_rename_function' tool in the MCP server's list_tools() function.

Tool(
    name=IDATools.RENAME_FUNCTION,
    description="Rename a function in the IDA database",
    inputSchema=RenameFunction.schema(),
),

src/mcp_server_ida/server.py:51-53 (schema)
Pydantic input schema for the 'ida_rename_function' tool defining old_name and new_name parameters.
```
class RenameFunction(BaseModel):
    old_name: str
    new_name: str
```

plugin/ida_mcp_server_plugin.py:206-210 (helper)

Request dispatcher in IDA plugin that routes 'rename_function' requests to the core implementation.

elif request_type == "rename_function":
    response.update(self.core.rename_function(
        request_data.get("old_name", ""),
        request_data.get("new_name", "")
    ))

ida-mcp-server