MongoDB World Implementation and Agent World Builder

[dustintownsend]

I've been interested in Workflow since it was announced, but I wanted to try it in other worlds / infra. The World documentation is still in progress, so I decided to dig into the code and figure out how they actually work. I had Claude help me generate documentation from the source, then used that to build a simple in-memory World first. After working through the various edge cases, I set up an agent specifically for building Worlds and used it to generate a MongoDB implementation.

What it includes:

• Storage (runs, steps, events, hooks) in MongoDB collections
• Queue with TTL-based idempotency
• Change streams for real-time output (graceful fallback without replica set)

Passes the @workflow/world-testing suite. Tested locally with a MongoDB Atlas M0 cluster.

Mongodb World @workflow-worlds/mongodb

Repo: https://github.com/mizzle-dev/workflow-worlds Not sure what will come of this, but figured I'd share for anyone else building Worlds or looking for a MongoDB option. And I plan to generate some more worlds to try out. I am thinking GCP and BullMQ/Redis. I want to have multiple options to test, so we can use Workflow with our existing infra.

If you have Claude and want to try out the agent just fork or clone the repo and tell it what kind of world you want to make. I added some sample prompts.

[pranaygp]

@dustintownsend thanks so much for sharing this! I also just added some benchmarking to the workflow monorepo and it would be really cool to see if and how we can test new worlds against it too :)

[pranaygp]

example matrix of benchmarking comparisons: #470 (comment)

[dustintownsend]

I like that idea. I'll see what I can do. I just got done with a Redis world that uses BullMQ so will have a couple to benchmark against.

[dustintownsend]

Got the basic benchmarking setup now. Mongodb World actually performs pretty well. https://github.com/mizzle-dev/workflow-worlds/actions/runs/19808082198/attempts/1#summary-56746128178