Funplay

Funplay

An open-source desktop AI workbench for building playable games with real project files, engine context, and agent tools.

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Funplay helps game ideas survive contact with the actual project. It combines a local-first Electron workspace, a built-in multi-provider AI agent runtime, engine-aware onboarding, MCP integrations, file editing, terminal tools, browser inspection, asset workflows, and release-grade verification.

The goal is simple: describe the game you want, connect the model and engine tools you trust, and let the agent plan, inspect, edit, run checks, generate assets, and keep the project moving toward something playable.

Product Preview

What Funplay Helps With

• Turn rough game concepts into scoped implementation plans.
• Create, inspect, and modify local project files with checkpointed agent tools.
• Run commands, read logs, inspect browser previews, search files, and recover from failed edits.
• Use OpenAI-compatible providers, Anthropic, Google, Bedrock, Vertex, and custom endpoints.
• Connect project-bound MCP servers and expose their tools/resources to the agent.
• Work with Unity, Cocos, and Godot projects through engine-aware diagnostics, bridge installation, open-project actions, and runtime state checks.
• Generate and manage game assets, including image, UI, texture, audio, 3D, and animation-oriented jobs.
• Keep provider settings, secrets, projects, sessions, generated assets, and agent run history local.

Engine Support

| Engine | Status | Current capabilities | | --- | --- | --- | | Unity | Real adapter | Unity Hub/Editor diagnostics, project opening, bridge installation, MCP connectivity, unity:// resource reads, runtime state refresh. | | Cocos Creator | Real adapter | Creator 3 project import/create flow, 2D/3D onboarding, funplay-cocos-mcp installation, MCP connectivity checks, cocos:// resource reads. | | Cocos4 / cocos-cli | Real adapter path | Headless project creation/opening through cocos-cli, supervised CLI server flow, prerequisite diagnostics, managed MCP startup. | | Godot | Real adapter | Godot 4 editor detection, macOS Spotlight fallback, guided editor install, 2D/3D project bootstrap, project opening, funplay-godot-mcp addon installation, and bridge diagnostics. | | Web / generic | Project inspector | Workspace/file/browser workflows and playable HTML preview guidance; no engine adapter side effects. | | Unreal | Contract stub | Structured unsupported responses with platform, capability, reason, and next action. |

Agent Runtime

Funplay's native runtime is a project-first tool loop with provider-neutral orchestration:

• Workspace tools: read/search files, write files, apply patches, multi-edit, run commands, persistent terminals, checkpoints.
• Runtime tools: browser inspection, web search/fetch, memory, notifications, media attachments, document reads, project inspection.
• MCP tools: list/call tools, read resources, and materialize project MCP tools directly when policy allows.
• Safety controls: permission broker, command sandboxing, write checkpoints, active verification after workspace or engine side effects, structured tool-result summaries, and replayable operation logs.
• Context controls: model-summary compaction, project evidence, recent-file context, provider capability registry, and multimodal input when the model supports vision.
• Subagents: local project definitions under .claude/agents or .funplay/agents, read-only investigator mode, worker tool pools, and persisted background run records.

Repository Layout

electron/main/      Main-process services, IPC handlers, persistence, agent platform
electron/preload/   Secure context bridge exposed as window.funplay
src/                React 19 renderer UI
shared/             Cross-process types and pure shared logic
tests/runtime/      Node runtime unit tests
tests/e2e/          Deterministic agent E2E task fixtures
tests/eval/         Agent evaluation scaffolding
scripts/            Build, smoke, benchmark, release, and native ABI helpers
resources/          Packaged assets and runtime placeholders
release/            electron-builder output (gitignored)

Important boundaries:

• Renderer code in src/ must not import from electron/main/.
• Main-process code in electron/main/ must not import from src/.
• Cross-process contracts belong in shared/ and electron/preload/index.ts.
• New IPC requires type updates, preload exposure, main handler wiring, and Zod validation.

Architecture

Funplay deliberately separates orchestration from platform integrations:

• electron/main/agent-core/ owns runtime-agnostic state, controller transitions, replay, Agent Core parts, and the single message stream used by UI and persistence.
• electron/main/agent-platform/native/ owns the built-in provider loop for Anthropic, Google, Bedrock, Vertex, OpenAI-compatible Chat Completions, OpenAI-compatible Responses, and Anthropic Messages-compatible endpoints.
• electron/main/agent-platform/tools/ owns registered agent tools and their risk, permission, checkpoint, and UI action metadata.
• electron/main/agent-platform/engine-adapters.ts defines the engine adapter contract used by tools/engine-control.ts.
• src/ projects Agent Core parts into chat transcripts, process timelines, settings pages, asset views, engine panels, and replayable run history.

The target shape is one authoritative agent event stream. UI, operation logs, persistence, verification reports, and detail panels are projections of that stream, not competing ledgers.

Providers, MCP, Assets, And Secrets

Funplay supports separate configuration for:

• chat/model providers
• asset-generation providers
• project MCP servers
• engine bridges
• web search providers

API keys are stored by main-process secret stores and are never sent to the renderer. The renderer talks to the app only through the typed window.funplay preload bridge.

Useful development environment variables:

• FUNPLAY_ALLOW_LOCAL_WEB_TOOLS=1 - allow local URL fetches in web-tool tests.
• BRAVE_SEARCH_API_KEY / BING_SEARCH_API_KEY - enable web search providers.
• FUNPLAY_COCOS_MCP_LOCAL_SOURCE=/path/to/funplay-cocos-mcp - install the Cocos bridge from a local checkout during development.
• FUNPLAY_GODOT_MCP_LOCAL_SOURCE=/path/to/funplay-godot-mcp - install the Godot bridge addon from a local checkout during development.
• GODOT_BIN=/path/to/Godot - point Funplay at a portable Godot editor binary when automatic discovery cannot find it.

Development

Install dependencies and start the desktop app:

npm install
npm run dev

npm run dev rebuilds native Electron dependencies for the correct ABI and starts Electron Vite.

On first launch:

1. Open Application Settings.
2. Add at least one AI provider.
3. Create or import a project.
4. Choose a workflow: Generic, Unity, Cocos, or Godot.
5. For engine projects, complete the onboarding checklist and connect the engine bridge/MCP server.
6. Start with a concrete goal such as "make a playable web prototype", "add a Unity level loop", "create a Cocos 3D scene", or "bootstrap a Godot 3D prototype and install the bridge."

Common commands:

npm run dev                 # Start the desktop app in development mode
npm run build               # Rebuild native deps, type-check, and build Electron targets
npm run test                # Run runtime tests with native ABI handling
npm run test:runtime        # Same runtime test suite, explicit script
npm run agent:e2e           # Deterministic scripted-provider agent E2E checks
npm run agent:benchmark     # Agent benchmark checks
npm run ui:smoke            # Static desktop UI smoke checks
npm run ui:electron-smoke   # Real Electron UI smoke scenarios
npm run ui:maturity-gate    # UI maturity gate
npm run runtime:maturity-gate # Runtime maturity gate

better-sqlite3 must match either the Node ABI or Electron ABI. npm run test:runtime handles the switch automatically. If you run a single Node test manually, restore Electron ABI afterward:

npm run rebuild:native:force

Contributing

Small, focused pull requests are easiest to review. Before opening a PR, run:

npm run build
npm run test:runtime

For UI changes, also run:

npm run ui:smoke
npm run ui:electron-smoke
npm run ui:maturity-gate

See [CONTRIBUTING.md](CONTRIBUTING.md) for repository boundaries and PR expectations.

License

Funplay is licensed under the [MIT License](LICENSE).

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: FunplayAI
• Source: FunplayAI/Funplay
• License: MIT
• Homepage: https://funplay.top/

Install and usage instructions live in the source repository linked above.