feat: Add MCPB bundle for Claude Desktop installation #580
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Add Model Context Protocol Bundle (MCPB) support enabling single-click installation in Claude Desktop and other MCP hosts. Changes: - Add manifest.json with uvx-based server configuration - Add icon.png for display in Claude Desktop - Add .mcpbignore for build exclusions - Add pre-built unity-mcp.mcpb bundle 🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Reviewer's GuideAdds a Model Context Protocol Bundle (MCPB) manifest and related packaging files so the Unity MCP server can be installed as a one-click bundle in Claude Desktop and other MCP hosts, using an uvx-based Python server entrypoint and enumerating all available tools. Sequence diagram for MCPB-based Unity MCP installation and launchsequenceDiagram
actor User
participant ClaudeDesktop
participant MCPBundle
participant MCPServerPython
participant PyPI
participant UnityEditor
User->>ClaudeDesktop: double_click unity_mcp_mcpb
ClaudeDesktop->>MCPBundle: read manifest_json
MCPBundle-->>ClaudeDesktop: server_config(type_python, entry_point, uvx_command)
ClaudeDesktop->>ClaudeDesktop: register tools_from_manifest
User->>ClaudeDesktop: select Unity_MCP_server
ClaudeDesktop->>MCPServerPython: launch uvx --from mcpforunityserver mcp_for_unity
MCPServerPython->>PyPI: download mcpforunityserver (if_needed)
PyPI-->>MCPServerPython: package_files
MCPServerPython->>UnityEditor: connect_via_Unity_MCP_plugin
UnityEditor-->>MCPServerPython: connection_ready
MCPServerPython-->>ClaudeDesktop: mcp_server_ready_with_29_tools
User->>ClaudeDesktop: invoke_tool manage_gameobject
ClaudeDesktop->>MCPServerPython: mcp_tool_request manage_gameobject
MCPServerPython->>UnityEditor: apply_gameobject_operation
UnityEditor-->>MCPServerPython: operation_result
MCPServerPython-->>ClaudeDesktop: tool_response
ClaudeDesktop-->>User: show_result
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📝 WalkthroughWalkthroughTwo new configuration files are introduced at the project root: Changes
Estimated code review effort🎯 1 (Trivial) | ⏱️ ~5 minutes Poem
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Hey - I've found 1 issue, and left some high level feedback:
- The
server.entry_pointis set toServer/src/main.pywhile the actual launch is handled viauvxinmcp_config; if the entry point is unused for this server type, consider either aligning it with the real module or omitting it to avoid confusion for future maintainers. - The
.mcpbignorefile is currently empty; consider explicitly ignoring the generated.mcpbbundle and any build or tooling artifacts (e.g.,node_modules,.venv, caches) to keep bundles minimal and reproducible.
Prompt for AI Agents
Please address the comments from this code review:
## Overall Comments
- The `server.entry_point` is set to `Server/src/main.py` while the actual launch is handled via `uvx` in `mcp_config`; if the entry point is unused for this server type, consider either aligning it with the real module or omitting it to avoid confusion for future maintainers.
- The `.mcpbignore` file is currently empty; consider explicitly ignoring the generated `.mcpb` bundle and any build or tooling artifacts (e.g., `node_modules`, `.venv`, caches) to keep bundles minimal and reproducible.
## Individual Comments
### Comment 1
<location> `manifest.json:20-23` </location>
<code_context>
+ "icon": "icon.png",
+ "server": {
+ "type": "python",
+ "entry_point": "Server/src/main.py",
+ "mcp_config": {
+ "command": "uvx",
+ "args": ["--from", "mcpforunityserver", "mcp-for-unity"],
+ "env": {}
+ }
</code_context>
<issue_to_address>
**issue (bug_risk):** Clarify whether the server should be launched via entry_point or mcp_config to avoid conflicting definitions.
The manifest defines both a Python `entry_point` and an `mcp_config` using `uvx`, which may cause different hosts to choose different startup paths. Decide which mechanism should be canonical and remove the other to avoid inconsistent behavior across MCP clients.
</issue_to_address>Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
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| "entry_point": "Server/src/main.py", | ||
| "mcp_config": { | ||
| "command": "uvx", | ||
| "args": ["--from", "mcpforunityserver", "mcp-for-unity"], |
Contributor
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issue (bug_risk): Clarify whether the server should be launched via entry_point or mcp_config to avoid conflicting definitions.
The manifest defines both a Python entry_point and an mcp_config using uvx, which may cause different hosts to choose different startup paths. Decide which mechanism should be canonical and remove the other to avoid inconsistent behavior across MCP clients.
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Summary
Adds Model Context Protocol Bundle (MCPB) support enabling single-click installation in Claude Desktop and other MCP hosts.
Changes
manifest.jsonwith uvx-based server configuration (downloads from PyPI)icon.png(Coplay avatar).mcpbignorefor build exclusionsunity-mcp.mcpbbundle for direct installationWhat is MCPB?
MCPB (MCP Bundle) is a packaging format that enables easy distribution of MCP servers. Similar to browser extensions (.crx) or VS Code extensions (.vsix), users can install the server with a single click.
Testing
mcpb validate)mcpb pack)Installation
Download the
unity-mcp.mcpbfile and double-click to install in Claude Desktop.Note: Requires the Unity MCP plugin installed in Unity Editor (see README for setup).
Building the Bundle
If you prefer to build from source:
npx @anthropic-ai/mcpb pack .🤖 Generated with Claude Code
Summary by Sourcery
Add MCP bundle metadata for the Unity MCP server to support installation via MCP hosts.
New Features:
Enhancements:
Summary by CodeRabbit
New Features
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