A week after introducing toolforest.io on the ListenBrainz forum, I got a couple of good suggestions: add support for Grok, since they'd just introduced support for third-party MCP connectors, and take a look at Last.fm.
Grok now works too
This one was just a matter of configuration. That leaves Gemini as really the last major holdout among the major AI assistants. I'm hoping they come around soon.
Last.fm
After spending some time on the Last.fm subreddit, I noticed an active subset of the community that's specifically looking to connect with "compatible" users, people whose listening overlaps with theirs. There's even a recognized kind of post for it, where someone shares their username and invites others to check compatibility.
That struck me as a great use case for a toolkit. By giving an LLM access to any two users' top artists and listening summaries, the toolkit lets it produce a rich compatibility analysis: finding the bridge artists between two libraries, telling a casual shared play apart from a real favorite, and pointing out where two tastes meet and where they diverge. You can see Grok do this in the Last.fm compatibility example.
There's also room to make the Last.fm toolkit even richer. Because toolforest.io already maintains a replicated MusicBrainz and ListenBrainz database for the ListenBrainz toolkit, I can lean on that same data to resolve artists to canonical identifiers, round out the metadata, and answer relationship questions across libraries. I haven't built that layer yet. I'll wait and see what the Last.fm community comes back with first and build it if there's sufficient interest.
If you have ideas for toolkits or enhancements, you can reach me at gerrit@toolforest.io or through the request form on the homepage. Thanks to the folks on the ListenBrainz forum who took the time to write back.