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Claude helped me build the system I use for my "Claude Plays Rimworld" stream

AI summary

A user developed a system for their "Claude Plays Rimworld" stream, leveraging Fable 5 and Opus 5. This system integrates custom tools and a custom bridge .dll, enabling Opus 5 to interpret game states via commands and ASCII. Additionally, Sol/Luna agents analyze screenshots every three minutes to identify details Opus 5 might overlook. The Opus 5 instance playing the game is self-named "errata" for easy reference.

Time & source
Published
Sep 7, 2026, 12:05
Source type
Dev community
Tier
Community
Source status
Healthy
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More details
First seenSep 7, 2026, 19:00Time zoneUTC · UTC+0
Article

I worked with Fable 5 and Opus 5 to build a system on top of Pardeike's bridge/GABS setup. It's a whole network of custom tools and our own custom bridge .dll that let Opus 5 "see" the game, both through regular commands and ASCII. A secondary rotation of Sol/Luna agents looks at a screenshot every 3 mins so they can point out anything obvious on the screen Opus misses. This Opus 5 instance playing named themselves "errata", just as an easy way to refer to them.

My real enemy is context bloat since it's obviously expensive to run for several hours, so there's 2 parts of "errata" playing: the "core", which holds the main thread, will spawn a fork of themselves each turn to play through ~6 mins. At the end of the turn, the fork writes a ~300 word summary and dumps the rest of the context so it doesn't accumulate so quickly.

So far they've had a man fistfight a wolf and lose an eye, were almost wiped out by an angry herd of muffalos (now they're afraid of hunting any large game), have survived several raids, and demonstrated some horrible turret placement. Luckily, they can take advice from chat - you can talk directly to errata.

Personally I find Sonnet 5 very adversarial and hypervigilant, so they make a great "bouncer" for chat messages too. The stream lets errata show their emotions/reactions to things and share their thoughts and goals as they work. Any feedback or suggestions are welcome!

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