# Unityctl > Unity control plane for AI agents — 178 CLI commands, 12 MCP tools, headless CI/CD, undo rollback, and closed-loop verification. - **Type:** MCP server - **Install:** `agentstack add mcp-jason-hub-star-unityctl` - **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior - **Seller:** [Jason-hub-star](https://agentstack.voostack.com/s/jason-hub-star) - **Installs:** 0 - **Category:** [Developer Tools](https://agentstack.voostack.com/c/developer-tools) - **Latest version:** 0.1.0 - **License:** MIT - **Upstream author:** [Jason-hub-star](https://github.com/Jason-hub-star) - **Source:** https://github.com/Jason-hub-star/unityctl - **Website:** https://www.nuget.org/packages/unityctl ## Install ```sh agentstack add mcp-jason-hub-star-unityctl ``` Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent. ## About # unityctl [English](README.md) | [한국어](README.ko.md) [](https://www.nuget.org/packages/unityctl) [](https://www.nuget.org/packages/unityctl-mcp) [](https://github.com/Jason-hub-star/unityctl/actions/workflows/ci-dotnet.yml) [](https://github.com/Jason-hub-star/unityctl/actions/workflows/ci-unity.yml) [](LICENSE) ### The execution layer for AI-driven game development. Give your AI agent **179 commands** to build Unity scenes, write C# scripts, validate builds, and ship games — with automatic rollback when things go wrong. ``` 179 CLI commands · 12 MCP tools · 966 PR .NET tests · Windows / macOS / Linux ``` Unrehearsed session against a live Unity 6000.3.16f1 Editor — every command answers in structured JSON and drops an artifact in out/. Benchmarked head-to-head against the official Unity CLI (1.0.0-beta.2 + com.unity.pipeline) on the same editor session — faster round-trips, smaller responses, and every measured gap absorbed the same day. See [the benchmark](docs/contest/benchmark-vs-unity-cli.md). | Measured (same editor, same tasks) | unityctl v0.6.0 | Official Unity CLI | |---|---|---| | Scene hierarchy read | **286 ms / 919 B** | 617 ms / 1,602 B | | Play enter → console → stop | **965 ms** | 2,588 ms | | Multi-statement C# eval | **1,755 ms** (opt-in gate) | 2,634 ms (always on) | | Domain-reload survival (unattended) | **313–516 ms** | 739 ms | | Unattended test run | **1 passed (4.2 s)** | false success — 0 tests ran | | Wrong arguments | explicit failure + candidate list | silently ignored, returns success | | Screenshot with no camera in scene | captures the view | fails | Quality gates: every PR runs the .NET Shared/Core/Cli/Mcp test suites on Windows, macOS, and Linux. Unity Editor-dependent validation is separated into the Unity Integration workflow, with `init`, sample-project `doctor`, `check`, `scene hierarchy`, `player-settings set/get`, and `workflow verify` evidence uploaded from nightly/manual runs. Unity Integration requires either a `UNITY_LICENSE` or `UNITY_SERIAL` GitHub secret. Contributors: see [CONTRIBUTING.md](CONTRIBUTING.md) for the test trust checklist, flaky-test policy, command sync checklist, and Unity live-validation split. --- ## The Problem AI agents can write code, but they **can't build games** — because Unity has no programmatic interface for scene editing, asset management, or project validation. Existing Unity MCP servers try to fix this, but they create new problems for AI agents: | Pain Point | Impact on AI Agent | |---|---| | **45 KB+ schemas** loaded every turn | Wastes tokens on tool definitions instead of reasoning | | **No validation feedback** | Agent can't tell if the scene is broken after changes | | **No rollback** | One bad command corrupts the project state | | **WebSocket drops on Play Mode** | Agent loses connection during Unity's Domain Reload | | **Editor must be open** | CI/CD pipelines can't run without a GUI | ## The Solution unityctl is a **.NET CLI + MCP server** that turns Unity Editor into a programmable API. For AI agents, this means a **closed-loop automation cycle** — the agent doesn't just _execute_ commands, it can _verify_ results, _diagnose_ failures, and _recover_ from mistakes: > **Other tools give agents hands. unityctl gives agents hands, eyes, and a safety net.** --- ## Why unityctl for AI Agents? | | unityctl | Existing Unity MCP | |---|---|---| | **Schema overhead** | **5 KB** per session (9x smaller) | 45 KB+ loaded every turn | | **Validation loop** | `project validate` + `scene diff` + `screenshot capture` | Agent flies blind | | **Error recovery** | `script get-errors` with file/line/column | Raw console output or nothing | | **Safe experimentation** | `batch execute --rollbackOnFailure` + `undo` | No rollback — mistakes are permanent | | **Connection stability** | Named Pipe — survives Domain Reload | WebSocket drops, reconnect needed | | **CI/CD** | `check` / `test` / `build --dry-run` work headless | Editor must be open | | **Diagnostics** | `doctor` classifies failures + suggests next steps | "Connection failed" | | **Commands** | **179** (read + write + validate + diagnose) | ~34-200 tools | | **Audit trail** | NDJSON flight recorder for every command | No history | | **Runtime** | Native .NET — no Python/TS bridge | Bridge overhead | | **Install** | `dotnet tool install -g unityctl` | Node.js + npm + port config | | **License** | **MIT** | Varies | ### Token Efficiency AI agent costs are dominated by tool schemas sent every turn. unityctl uses **on-demand schema loading**: The CLI exposes 179 entry points, including convenience wrappers. The 12 MCP tools keep prompts small by loading 171 canonical command schemas on demand through `unityctl_query`, `unityctl_run`, and `unityctl_schema`. --- ## Install **Standalone binary — no .NET SDK required** (recommended): ```bash # macOS (Apple Silicon) — swap in unityctl-osx-x64 / unityctl-linux-x64 as needed curl -L https://github.com/Jason-hub-star/unityctl/releases/latest/download/unityctl-osx-arm64.tar.gz | tar xz ./unityctl --version ``` Windows: download `unityctl-win-x64.zip` from [Releases](https://github.com/Jason-hub-star/unityctl/releases/latest) and unzip. Each archive contains a self-contained `unityctl` + `unityctl-mcp` executable and the embedded Unity plugin template. **Or via .NET tool** (requires .NET 10 SDK): ```bash dotnet tool install -g unityctl dotnet tool install -g unityctl-mcp ``` Optional agent workflow skill for Claude Code and Codex: ```bash npx skills add Jason-hub-star/unityctl \ --skill unityctl-workflows \ -a claude-code -a codex ``` The skill teaches agents to discover the live command surface, target the right Unity project, and close every edit with structured readback and verification. Bootstrap notes: - `--source` accepts a local `Unityctl.Plugin` folder or a Git URL: `https://github.com/Jason-hub-star/unityctl.git?path=/src/Unityctl.Plugin#v0.6.5` ## Quick Start ```bash # 1. Install the Editor plugin unityctl init --project /path/to/project \ --source "https://github.com/Jason-hub-star/unityctl.git?path=/src/Unityctl.Plugin#v0.6.5" # 2. Open the project in Unity Editor, then verify connectivity unityctl ping --project /path/to/project --json unityctl status --project /path/to/project --json # 3. Start building unityctl gameobject create --name "Player" --project /path/to/project unityctl component add --id "" --type "Rigidbody" --project /path/to/project unityctl scene save --project /path/to/project # 4. Validate unityctl project validate --project /path/to/project --json # 5. Build unityctl build --project /path/to/project --dry-run # 13 preflight checks ``` ### MCP Setup (AI Agents) One command per client — it merges into the existing config instead of replacing it: ```bash unityctl mcp install --client claude-code # or cursor / codex unityctl mcp install --client vscode --project . # VS Code is workspace-scoped unityctl mcp install --client cursor --dry-run # preview, writes nothing ``` Or add it by hand: ```json { "mcpServers": { "unityctl": { "command": "unityctl-mcp" } } } ``` --- ## Documentation - [Command Reference](docs/ref/commands.md) — all 179 CLI commands and the 12 MCP tools - [README Appendix](docs/ref/readme-appendix.md) — worked examples, architecture, platform support - [Getting Started](docs/ref/getting-started.md) — installation, setup, and common workflows - [AI Agent Quickstart](docs/ref/ai-quickstart.md) — MCP setup and agent integration guide - [Showcase Roadmap](docs/ref/showcase-roadmap.md) — recommended demo game ladder, asset checklist, and pre-production plan - [Architecture](docs/ref/architecture-mermaid.md) — system design and transport diagrams - [Glossary](docs/ref/glossary.md) — key terms and concepts ## Changelog See [GitHub Releases](https://github.com/Jason-hub-star/unityctl/releases) for version history. ## License MIT — see [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:** [Jason-hub-star](https://github.com/Jason-hub-star) - **Source:** [Jason-hub-star/unityctl](https://github.com/Jason-hub-star/unityctl) - **License:** MIT - **Homepage:** https://www.nuget.org/packages/unityctl Install and usage instructions live in the source repository linked above. ## Pricing - **Free** — Free ## Security capabilities Automated source analysis of v0.1.0 — what this tool can access: - **Network access:** yes - **Filesystem access:** no - **Shell / process execution:** no - **Environment & secrets:** no - **Dynamic code execution:** no *"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.* ## Versions - **0.1.0** — security scan: passed — Imported from the upstream source. ## Links - Listing page: https://agentstack.voostack.com/l/mcp-jason-hub-star-unityctl - Seller: https://agentstack.voostack.com/s/jason-hub-star - Browse the marketplace: https://agentstack.voostack.com/browse --- Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.