The existing octopus MMM is good, but theres scope for expansion on the idea.

The AGILE plan is a 1/2 hourly tariff (https://www.energy-stats.uk/octopus-agile/), with the following days updates released 4-4:30pm each day.

It would be great to have:

The last/next 24 hours pricing (maybe set this in variables as its a lot of lines)
Highlight pricing above/below specified thresholds (again, variable), i.e. green below 8p a unit, red above 15p, so you can spot at a glance the good/bad times for usage. Bonus points for plunge pricing (below 0p) to go nuts somehow
Display user usage for each 1/2 hour period next to the price - so people can check their costs - again bonus points for calculating the approx cost and showing spikes in usage somehow :)

This might need to be 2 modules, but to my mind its one long flow, updating every 1/2 hour (or perhaps it would be better to update everyday at 5/6pm when the numbers change) so that at a glance you can see:

cheap / expensive times to put the washing on today
when you should put all the EVs, batteries, storage heaters etc on charge to use plunge pricing
how well you are matching your usage to the expense

Octopus AGILE - price and usage in 1/2 hour chunks