From a47da655754dbc3e5eb484fb6d6a69ef5d80c475 Mon Sep 17 00:00:00 2001 From: mmar58 Date: Fri, 20 Mar 2026 17:45:09 +0600 Subject: [PATCH 1/2] Enabled mcp-studio to connect with the agent ide like antigravity - Added debug.log in McpSettings to allow setting auth token from unity editor - Added mcp_stdio.js to allow stdio connection proxy to allow antigravity like agents to access it - Added mcp-instructions.md to guide users on how to check from cmd or how to connect using antigravity - Added necessary package to support mcp stdio --- Editor/Settings/McpSettings.cs | 2 + Server~/mcp-instructions.md | 64 +++ Server~/package.json | 4 +- Server~/pnpm-lock.yaml | 783 +++++++++++++++++++++++++++++++++ Server~/src/mcp-stdio.js | 131 ++++++ Server~/src/server.js | 1 + 6 files changed, 984 insertions(+), 1 deletion(-) create mode 100644 Server~/mcp-instructions.md create mode 100644 Server~/pnpm-lock.yaml create mode 100644 Server~/src/mcp-stdio.js diff --git a/Editor/Settings/McpSettings.cs b/Editor/Settings/McpSettings.cs index 77a6e06..4053c29 100644 --- a/Editor/Settings/McpSettings.cs +++ b/Editor/Settings/McpSettings.cs @@ -136,8 +136,10 @@ static void Load() { // Generate token if empty if (string.IsNullOrEmpty(_instance.authToken)) { _instance.authToken = GenerateToken(); + // Debug.Log($"[McpSettings] Generated new auth token: {_instance.authToken}"); Save(); } + Debug.Log($"[McpSettings] Auth token {_instance.authToken}"); } public static void Save() { diff --git a/Server~/mcp-instructions.md b/Server~/mcp-instructions.md new file mode 100644 index 0000000..d89b3b9 --- /dev/null +++ b/Server~/mcp-instructions.md @@ -0,0 +1,64 @@ +# Connecting to UnityMCP + +This guide explains how to test your Unity MCP server from the command line and how to configure Antigravity to use it. + +## Testing via CMD (Original HTTP JSON-RPC) + +Since the original `server.js` implementation uses HTTP POST JSON-RPC, you can test it directly via Command Prompt or PowerShell without any special MCP client tools. + +Make sure `server.js` is running: +```cmd +npm start +``` + +**Using Command Prompt (curl):** +```cmd +curl -X POST http://127.0.0.1:5173/mcp -H "Content-Type: application/json" -H "Authorization: Bearer dev-local-token" -d "{\"jsonrpc\": \"2.0\", \"id\": 1, \"method\": \"tools/list\"}" +``` + +**Using PowerShell:** +```powershell +Invoke-RestMethod -Uri "http://127.0.0.1:5173/mcp" -Method Post -Headers @{"Authorization"="Bearer dev-local-token"} -ContentType "application/json" -Body '{"jsonrpc": "2.0", "id": 1, "method": "tools/list"}' +``` + +*** + +## Connecting UnityMCP to Antigravity + +Antigravity natively requires an MCP server to communicate through the standard **stdio** transport or **SSE** stream. The newly implemented `src/mcp-stdio.js` allows Antigravity to connect via stdio exactly as intended by the MCP protocol. + +### Antigravity Configuration + +To attach the server to the Antigravity agent context (or an IDE like Cursor, Windsurf, Claude Desktop), you need to add it to your MCP settings file (typically `mcp.json` or within IDE settings for MCP Servers): + +1. **Open your MCP configuration file.** +2. **Add the following entry snippet:** + +```json +{ + "mcpServers": { + "unity-mcp": { + "command": "node", + "args": [ + "f:/Node/UnityMCP/Server~/src/mcp-stdio.js" + ], + "env": { + "MCP_TOKEN": "dev-local-token", + "MCP_HTTP_PORT": "5173", + "MCP_IPC_PORT": "52100" + } + } + } +} +``` + +### Starting the Server Manually (Troubleshooting) +If you want to manually run the stdio server to make sure it loads correctly and finds the new MCP SDK: +```cmd +npm run mcp +``` +*(Note: Because it's a `stdio` server, it will appear to hang and not print anything besides standard error logs. This is perfectly normal because it's actively waiting for JSON-RPC inputs from Antigravity over `stdin`)*. + +--- + +**That's it! Once Antigravity restarts or you reload the MCP configurations, it will spin up the `mcp-stdio.js` script in the background and establish a direct connection to your Unity tools.** diff --git a/Server~/package.json b/Server~/package.json index d920c10..c9502af 100644 --- a/Server~/package.json +++ b/Server~/package.json @@ -4,12 +4,14 @@ "private": true, "type": "commonjs", "scripts": { - "start": "node src/server.js" + "start": "node src/server.js", + "mcp": "node src/mcp-stdio.js" }, "engines": { "node": ">=18" }, "dependencies": { + "@modelcontextprotocol/sdk": "^1.27.1", "dotenv": "^17.2.3" } } diff --git a/Server~/pnpm-lock.yaml b/Server~/pnpm-lock.yaml new file mode 100644 index 0000000..fe611ef --- /dev/null +++ b/Server~/pnpm-lock.yaml @@ -0,0 +1,783 @@ +lockfileVersion: '9.0' + +settings: + autoInstallPeers: true + excludeLinksFromLockfile: false + +importers: + + .: + dependencies: + '@modelcontextprotocol/sdk': + specifier: ^1.27.1 + version: 1.27.1(zod@4.3.6) + dotenv: + 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side-channel-map@1.0.1: + dependencies: + call-bound: 1.0.4 + es-errors: 1.3.0 + get-intrinsic: 1.3.0 + object-inspect: 1.13.4 + + side-channel-weakmap@1.0.2: + dependencies: + call-bound: 1.0.4 + es-errors: 1.3.0 + get-intrinsic: 1.3.0 + object-inspect: 1.13.4 + side-channel-map: 1.0.1 + + side-channel@1.1.0: + dependencies: + es-errors: 1.3.0 + object-inspect: 1.13.4 + side-channel-list: 1.0.0 + side-channel-map: 1.0.1 + side-channel-weakmap: 1.0.2 + + statuses@2.0.2: {} + + toidentifier@1.0.1: {} + + type-is@2.0.1: + dependencies: + content-type: 1.0.5 + media-typer: 1.1.0 + mime-types: 3.0.2 + + unpipe@1.0.0: {} + + vary@1.1.2: {} + + which@2.0.2: + dependencies: + isexe: 2.0.0 + + wrappy@1.0.2: {} + + zod-to-json-schema@3.25.1(zod@4.3.6): + dependencies: + zod: 4.3.6 + + zod@4.3.6: {} diff --git a/Server~/src/mcp-stdio.js b/Server~/src/mcp-stdio.js new file mode 100644 index 0000000..acfb4d1 --- /dev/null +++ b/Server~/src/mcp-stdio.js @@ -0,0 +1,131 @@ +"use strict" + +// NOTE: Do NOT use dotenv here. dotenv v17+ prints to stdout which corrupts +// the MCP stdio JSON-RPC channel. Env vars come from mcp_config.json instead. +const crypto = require("crypto") + +const { config } = require("./config") +const { tools } = require("./toolRegistry") +const { resources } = require("./resourceRegistry") + +const { httpHost, httpPort, authEnabled, authToken } = config +const API_URL = `http://${httpHost}:${httpPort}/mcp` + +async function makeRpcCall(method, params, timeoutMs = 15000) { + const payload = { + jsonrpc: "2.0", + id: crypto.randomUUID(), + method, + params + } + + const headers = { + "Content-Type": "application/json" + } + + if (authEnabled && authToken) { + headers["Authorization"] = `Bearer ${authToken}` + } + + try { + const controller = new AbortController() + const timeoutId = setTimeout(() => controller.abort(), timeoutMs) + + const res = await fetch(API_URL, { + method: "POST", + headers, + body: JSON.stringify(payload), + signal: controller.signal + }) + clearTimeout(timeoutId) + + if (!res.ok) { + throw new Error(`HTTP Error: ${res.status} ${res.statusText}`) + } + + const data = await res.json() + if (data.error) { + throw new Error(data.error.message || JSON.stringify(data.error)) + } + return data.result + } catch (e) { + throw new Error(`Proxy to ${API_URL} failed: ${e.message}`) + } +} + +async function main() { + const { Server } = await import("@modelcontextprotocol/sdk/server/index.js") + const { StdioServerTransport } = await import("@modelcontextprotocol/sdk/server/stdio.js") + const { CallToolRequestSchema, ListToolsRequestSchema, ReadResourceRequestSchema, ListResourcesRequestSchema } = await import("@modelcontextprotocol/sdk/types.js") + + const server = new Server( + { + name: "unity-mcp-server-proxy", + version: "1.0.0", + }, + { + capabilities: { + tools: {}, + resources: {}, + }, + } + ) + + // Serve list operations locally since we evaluate the registries when the script runs + server.setRequestHandler(ListToolsRequestSchema, async () => { + return { + tools: (Array.isArray(tools) ? tools : []).map((t) => ({ + name: t.name, + description: t.description || "", + inputSchema: t.inputSchema || { type: "object", properties: {}, additionalProperties: true }, + })), + } + }) + + server.setRequestHandler(ListResourcesRequestSchema, async () => { + return { + resources: (Array.isArray(resources) ? resources : []).map((r) => ({ + uri: r.uri, + name: r.name, + description: r.description || "", + mimeType: r.mimeType || "application/json", + })), + } + }) + + // Proxy active tool calls and resource reads to your main running HTTP server (npm start) + server.setRequestHandler(CallToolRequestSchema, async (request) => { + try { + const result = await makeRpcCall("tools/call", { + name: request.params.name, + arguments: request.params.arguments || {} + }, 10000) + + // The main server.js handles normalizing the `{ content: [], isError: false }` format + return result + } catch (e) { + return { + content: [{ type: "text", text: e.message }], + isError: true + } + } + }) + + server.setRequestHandler(ReadResourceRequestSchema, async (request) => { + try { + const result = await makeRpcCall("resources/read", { + uri: request.params.uri + }, 10000) + + return result + } catch (e) { + throw new Error(e.message) // ReadResource schema expects errors to be thrown + } + }) + + const transport = new StdioServerTransport() + await server.connect(transport) + console.error(`[mcp-stdio-proxy] Stdio adapter running! Forwarding executing commands to your main server at ${API_URL}`) +} + +main().catch(console.error) diff --git a/Server~/src/server.js b/Server~/src/server.js index 78f350e..51ca98c 100644 --- a/Server~/src/server.js +++ b/Server~/src/server.js @@ -73,6 +73,7 @@ function requireAuth(req, res) { const want = `Bearer ${authToken}` if (h !== want) { + console.log(`[Auth Failed] Received: "${h}" | Expected: "${want}"`) sendJson(res, 401, makeError(null, -32001, "Unauthorized")) return false } From ce0e32f7dd9998608b1b9fff358c641bcfe37bf0 Mon Sep 17 00:00:00 2001 From: mmar58 Date: Fri, 20 Mar 2026 17:51:01 +0600 Subject: [PATCH 2/2] Removed extra comments --- Editor/Settings/McpSettings.cs | 1 - Server~/src/server.js | 1 - 2 files changed, 2 deletions(-) diff --git a/Editor/Settings/McpSettings.cs b/Editor/Settings/McpSettings.cs index 4053c29..8a76eba 100644 --- a/Editor/Settings/McpSettings.cs +++ b/Editor/Settings/McpSettings.cs @@ -136,7 +136,6 @@ static void Load() { // Generate token if empty if (string.IsNullOrEmpty(_instance.authToken)) { _instance.authToken = GenerateToken(); - // Debug.Log($"[McpSettings] Generated new auth token: {_instance.authToken}"); Save(); } Debug.Log($"[McpSettings] Auth token {_instance.authToken}"); diff --git a/Server~/src/server.js b/Server~/src/server.js index 51ca98c..78f350e 100644 --- a/Server~/src/server.js +++ b/Server~/src/server.js @@ -73,7 +73,6 @@ function requireAuth(req, res) { const want = `Bearer ${authToken}` if (h !== want) { - console.log(`[Auth Failed] Received: "${h}" | Expected: "${want}"`) sendJson(res, 401, makeError(null, -32001, "Unauthorized")) return false }