Build a Valheim city-building mod with Claude

The author used Claude to write C# code and remote command files to control the game, transforming Valheim into a city-building simulator. The mod features Viking residents, taxes, NPC needs, boss fights, and performance optimizations, and is available for free on Nexus and Thunderstore.

Reddit r/ClaudeAI/u/Any-Explanation3814

ClaudeBepInExHarmonyNexusThunderstore

Added 2026-10-31 · originally published 2026-10-26

Steps

1Design the core gameplay of the mod, such as Viking residents, tax collection, dietary needs, and boss fight mechanics.
2Use Claude to write C# code, integrating with the BepInEx framework and Harmony patches to hook into the game systems for resident AI, economic systems, and automated building construction.
3Have the AI control the game via remote command files to automatically build towns, take screenshots, inspect visuals, and fix issues independently.
4Handle bug fixing by feeding tester feedback—such as boss pursuit issues and NPCs getting stuck—to Claude to diagnose and fix all at once.
5Perform performance optimization by writing in-game benchmarks to measure frame rates under varying building counts, using techniques like mesh merging to boost FPS.

Copy-ready prompt

Please help me write a C# script that integrates with the [BepInEx framework] and [Harmony patches] to implement the following game mod features: [describe the AI, economic, or building systems you want to add to the game]. Also, write a remote control mechanism that allows the program to control the game for testing, taking screenshots, and fixing code issues.

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#Claude#AI Programming#Game Mod#C#

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