As you noted you have search and the ability to read specific topics, posts, users and tags which covers most of what is needed.
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Chat with forum information
One that is of great value is similar to the idea of using AI to read a PDF then chat with the PDF. Instead of the content coming from the PDF, the content is from the Discourse forum.
Now while there is Discourse AI, wrapping some of the read-only functionality with a common interface, e.g. MCP, and being able to access within a common MCP host, e.g. Claude, increases the usefulness.
Additionally with this ability, one could in the MCP host, e.g. Anthropic Claude, add other agents or sources of information that could be used with the information from the Discourse MCP.
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Morning brief
On most days I visit over 20 different places for information, a few of them being Discourse forums and looking for specific information, or something of value that I was not specifically seeking. What would be nice is to get all of this automated and a Discourse MCP would be of value; yes I know not all Discourse sites would be required to allow access via an MCP.
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MCP Discourse forum discriminator (AKA Relevance score)
As a programmer am a member of several Discourse forums related to software. If all of them have MCP servers and all of them are activated for use with an MCP host, and I ask a not so specific question about coding, e.g. giving a coding fragment, there needs to be a way for the MCP server to give feedback if this question is a good fit for that forum before requesting a more expensive request.
Yes this is an odd question, but we know that in reality this is a possible real world scenario.
Do not expect a solution right away but something to ponder.
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Frequently asked question that are unanswered (AKA Lacuna)
Since the AI can quickly scan and summarize all topics into points in the vector space, it is possible for it to identify frequently asked questions that are not being answered. This is a common occurrence when something new is released such as with software updates, or even more real time when servers go down.
Additionally one could use the Discourse MCP to help a user identify commonalities in the information that could take minutes to hours to do so by hand.
From trying to help with server down issues this would be of great value, e.g. a server is working for me but not in another country, or it is working for me with Windows, but not with Apple phones, or there is a pattern of related problems but because users do not use the correct terminology it goes unanswered, e.g. CFG should be used but is not.
For me personally, currently not looking for the ability to write or modify.