Cities2 MCP and Modding Toolkit — Claude Code MCP server
A local MCP server for Cities: Skylines II questions and mod projects. It gives agents searchable game references and tools for building mods.
claude mcp add --env CITIES2_MODS_DIR=<CITIES2_MODS_DIR> --env CITIES2_GAME_DIR=<CITIES2_GAME_DIR> --env CITIES2_LOCALE_COK=<CITIES2_LOCALE_COK> --transport stdio cities2-mcp-and-modding-toolkit -- uvx cities2-mcpWhat Cities2 MCP and Modding Toolkit does
The server lets an agent search a prepared Cities: Skylines II wiki, attributed research reports, and the encyclopedia extracted from a local game install. It can explain game systems, discuss update details, and return source context with its answers.
Five skills cover game knowledge, mod development, review, debugging, and release checks. Local workflow tools can generate C# or UI project skeletons, edit files in trusted workspaces, run builds and analyzers, and package the output. The bundle is aimed at CS2 mod projects.
The game encyclopedia needs a local installation and the file Cities2_Data/Content/Game/Locale.cok to be found. Mod and game locations are supplied through environment variables. A mod is not treated as ready to share until it has been playtested locally.
What it helps with
- look up Cities: Skylines II game mechanics
- summarize patch and update changes
- scaffold a C# or UI mod project
- build and package mod output
- review a mod before sharing
Example prompts for the agent
- Search the wiki for how public transport works in Cities: Skylines II.
- Create a C# mod skeleton in the configured workspace and run its build.
- Review this mod for packaging issues and release readiness.
How to install Cities2 MCP and Modding Toolkit
Platform CLI
claude mcp add --env CITIES2_MODS_DIR=<CITIES2_MODS_DIR> --env CITIES2_GAME_DIR=<CITIES2_GAME_DIR> --env CITIES2_LOCALE_COK=<CITIES2_LOCALE_COK> --transport stdio cities2-mcp-and-modding-toolkit -- uvx cities2-mcpReplace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from cities2-mcp <command>
Platform CLI
codex mcp add cities2-mcp-and-modding-toolkit --env CITIES2_MODS_DIR=<CITIES2_MODS_DIR> --env CITIES2_GAME_DIR=<CITIES2_GAME_DIR> --env CITIES2_LOCALE_COK=<CITIES2_LOCALE_COK> -- uvx cities2-mcpReplace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from cities2-mcp <command>
Config file
{
"mcpServers": {
"cities2-mcp-and-modding-toolkit": {
"command": "uvx",
"args": [
"cities2-mcp"
],
"env": {
"CITIES2_MODS_DIR": "<CITIES2_MODS_DIR>",
"CITIES2_GAME_DIR": "<CITIES2_GAME_DIR>",
"CITIES2_LOCALE_COK": "<CITIES2_LOCALE_COK>"
}
}
}
}Replace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from cities2-mcp <command>
Config file
{
"servers": {
"cities2-mcp-and-modding-toolkit": {
"type": "stdio",
"command": "uvx",
"args": [
"cities2-mcp"
],
"env": {
"CITIES2_MODS_DIR": "<CITIES2_MODS_DIR>",
"CITIES2_GAME_DIR": "<CITIES2_GAME_DIR>",
"CITIES2_LOCALE_COK": "<CITIES2_LOCALE_COK>"
}
}
}
}Replace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from cities2-mcp <command>
Platform CLI
gemini mcp add -e CITIES2_MODS_DIR=<CITIES2_MODS_DIR> -e CITIES2_GAME_DIR=<CITIES2_GAME_DIR> -e CITIES2_LOCALE_COK=<CITIES2_LOCALE_COK> cities2-mcp-and-modding-toolkit uvx cities2-mcpReplace <…> with your own values. uvx runs the command named after the package; if the README names another one, use uvx --from cities2-mcp <command>
Step by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about Cities2 MCP and Modding Toolkit
How do I install Cities2 MCP and Modding Toolkit in Claude Code?
Run claude mcp add cities2-mcp -- uvx cities2-mcp.
What does Cities2 MCP and Modding Toolkit do?
It searches game references and research reports, reads the local encyclopedia when available, and supports scaffolding, building, debugging, reviewing, and packaging Cities: Skylines II mods.
What is needed to use the local game encyclopedia?
Cities: Skylines II must be installed locally, with Cities2_Data/Content/Game/Locale.cok available to the server. Its location can be supplied through CITIES2_LOCALE_COK.
