Provides tools for AI agents in OpenAI Codex CLI to drive Coherent Gameface UI via Chrome DevTools Protocol: evaluate JavaScript, inspect DOM, take screenshots, capture console output, and set breakpoints.
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@gameface-devtools-mcp show me the console logs from the game UI"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
The CS Modding marketplace (csmodding) of agent plugins for Claude Code and OpenAI Codex CLI.
Give your coding agent eyes and hands inside a running game: its HTML UI, and its C#/ECS internals. Generic tooling, developed and verified against Cities: Skylines II.
Plugins · Install · Development
Plugin | Give your agent… | Runs on | Docs |
A live line into a Unity Mono dev build over the Mono Soft Debugger: reflect types, evaluate C# expressions, read & write ECS state. No code injection. Plus a driving skill. | .NET 10 SDK (Windows) | ||
Eyes and hands in any Coherent Gameface (Cohtml) game UI over CDP: evaluate JS, screenshot, drive the DOM, console, JS breakpoints. Plus an engine skill and a driving skill. | Node 22.4+ | README · Tools reference · npm |
Both plugins are generic: they target any game or application embedding the technology, with Cities: Skylines II as the reference target where everything is field-verified.
Not using Claude Code or Codex CLI? The Gameface MCP server is also published on npm as
@csmodding/gameface-devtools-mcp
and works with any MCP client (Cursor, Gemini CLI, VS Code, …).
Related MCP server: js-reverse-mcp
Add the marketplace once, then install the plugin(s) you want. Each plugin autoloads its MCP server from a committed artifact: no installation step, works offline, version-locked to the plugin.
/plugin marketplace add CitiesSkylinesModding/agents-plugins
/plugin install coherent-gameface@csmodding
/plugin install unity-devtools@csmoddingOr from your terminal, claude plugin marketplace add … / claude plugin install … with the same
arguments.
codex plugin marketplace add CitiesSkylinesModding/agents-plugins
codex plugin add coherent-gameface@csmodding
codex plugin add unity-devtools@csmoddingThen run /mcp to confirm the servers connected. Each plugin's README covers its requirements,
configuration and troubleshooting.
Uses mise + bun (never npx). The repository is a marketplace: plugin sources live under
plugins/<name>/, and everything a plugin ships lives inside its directory. The root is a bun
workspace carrying the lint/format tooling (oxlint, oxfmt) and the lefthook git hooks; the
Gameface MCP server is the plugins/coherent-gameface/mcp/ workspace package, and the Unity MCP
server is a .NET solution (agents-plugins.slnx).
bun install # install all workspace deps (also installs the git hooks)
mise check # verify (read-only): type-check, lint, format
mise fix # auto-fix lint + format in place
mise build # rebuild every shipped artifact (commit the results)Run mise tasks for the full list, and see AGENTS.md (plus each plugin's own
AGENTS.md) for the architecture notes.
This server cannot be installed
Unclaimed servers have limited discoverability.
If you are the server author, to access and configure the admin panel.
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