fo-semantic-mcp Setup for Google Antigravity

About Google Antigravity

Google Antigravity is an agentic development platform built on VS Code, powered by Gemini 3 Pro. It combines a familiar coding experience with an agent-first interface, allowing you to deploy AI agents that autonomously plan, execute, and verify complex tasks.

Antigravity supports the Model Context Protocol (MCP), enabling fo-semantic-mcp to provide D365 F&O artifact search capabilities directly in your development workflow.

HTTP Transport for MCP

Antigravity connects to MCP servers via HTTP transport. fo-semantic-mcp provides a hosted endpoint at https://mcp.xplusplus.ai/mcp - no local installation required.

Configuration Steps

Get Your API Key
Sign in to xplusplus.ai and get your API key from the dashboard.
Get API Key
Open MCP Settings in Antigravity
In Antigravity IDE, navigate to Settings and find the MCP Servers configuration section.
Add the MCP Server Configuration
Add the following JSON configuration to connect fo-semantic-mcp:

{ "mcpServers": { "fo-semantic": { "serverUrl": "https://mcp.xplusplus.ai/mcp", "headers": { "X-API-Key": "your_api_key_here", "X-FO-Local-Assets-Path": "C:\\Users\\YourName\\AppData\\Local\\Microsoft\\Dynamics365\\10.0.xxxx\\PackagesLocalDirectory", "X-FO-Search-Default-Limit": "10", "X-FO-Search-Default-Threshold": "0.7", "Content-Type": "application/json" } } } }

Configuration Headers

X-API-Key (required) - Your API key from xplusplus.ai
X-FO-Local-Assets-Path (recommended) - Path to your local F&O PackagesLocalDirectory for XML file reading
X-FO-Search-Default-Limit - Number of search results (default: 10)
X-FO-Search-Default-Threshold - Relevance threshold 0-1 (default: 0.5)
Save and Activate
Save the configuration. Antigravity will connect to the MCP server automatically.
Test the Connection
Try asking Antigravity to search for F&O artifacts:

List F&O forms that involve CustTable table, include full physical file path in result

Example in Action

Here's what it looks like when Antigravity uses the MCP server to find F&O forms related to CustTable:

Google Antigravity using fo-semantic-mcp to search F&O artifacts

Antigravity automatically calls fo-semantic-mcp to search for forms involving CustTable, returning the full paths to each XML file in the PackagesLocalDirectory.

What's Happening

When you ask about F&O artifacts, Antigravity's AI agent automatically invokes the MCP server's search_fo_artifacts function via HTTP. The server queries the xplusplus.ai artifact index and returns matching results with their local file paths based on your configured PackagesLocalDirectory.

Finding Your PackagesLocalDirectory

To enable local XML file reading, set the X-FO-Local-Assets-Path header to your F&O installation path:

Typical Windows path:

C:\Users\[YourName]\AppData\Local\Microsoft\Dynamics365\[version]\PackagesLocalDirectory

PowerShell command to find it:

Get-ChildItem "$env:LOCALAPPDATA\Microsoft\Dynamics365\" -Recurse -Filter "PackagesLocalDirectory" | Select-Object FullName

Note: Use double backslashes (\\) in the JSON configuration for Windows paths.

HTTP vs Stdio Transport

fo-semantic-mcp supports two connection modes:

Feature	HTTP (Antigravity)	Stdio (Cursor/Codex)
Connection	HTTPS to mcp.xplusplus.ai	Local npx process
Config Format	JSON with headers	JSON/TOML with env vars
API Key Location	X-API-Key header	FOINDEX_API_KEY env
Local Node.js Required	No	Yes

Troubleshooting

Connection failed?

Verify the serverUrl is exactly https://mcp.xplusplus.ai/mcp
Check your API key is correct and active
Ensure Content-Type header is set to application/json

No results returned?

Try lowering the X-FO-Search-Default-Threshold value (e.g., 0.5)
Check your API key has available quota
Try a simpler search query

File paths not showing?

Make sure X-FO-Local-Assets-Path is set correctly
Use double backslashes for Windows paths in JSON
Verify the PackagesLocalDirectory exists at that path

fo-semantic-mcp Setup for Antigravity