Five-Client MCP Config Compiler

Compile validated Cursor, Claude, and VS Code MCP configs in seconds.

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Transport: stdio · 14ms schema reflection / 22ms parameterized query round-trip

PostgreSQL Official MCP Server @modelcontextprotocol/server-postgres

Install.sh

{
  "mcpServers": {
    "postgres": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-postgres",
        "postgresql://readonly_user:password@localhost:5432/production_db"
      ],
      "env": {
        "PGSSLMODE": "require"
      }
    }
  }
}

Ready 5-client compiler ready · postgres

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Technical Reference for Cross-Client Model Context Protocol Configuration Synthesis

MCPConfigForge compiles and validates Model Context Protocol server definitions across five host dialects: Cursor IDE (.cursor/mcp.json), Claude Desktop on macOS and Linux, Claude Desktop on Windows 11 with mandatory cmd /c npx process spawning wrappers, Claude Code CLI one-line registration commands, and VS Code Copilot Agent Mode (.vscode/mcp.json).

On Windows 11, Electron applications invoke child_process.spawn without a shell, causing direct npx invocations to fail with spawn npx ENOENT. MCPConfigForge normalizes Windows 11 configurations to invoke cmd with /c and npx flags automatically while preserving environment variable isolation.

Whereas Cursor and Claude Desktop nest server objects under the mcpServers root property, VS Code Copilot requires a top-level servers object with an explicit stdio or http transport declaration and interactive input variables to prevent accidental credential commits.

Autonomous coding agents and CI/CD pipelines can query GET /api/v1/forge?server=postgres for JSON output, download POSIX shell installers from /api/install.sh, or connect to /.well-known/mcp for JSON-RPC 2.0 tool execution.

Every blueprint in the twenty-server index includes transport latency benchmarks, required environment variable schemas, and secret-hygiene lint rules so engineering teams can lock deterministic MCP configurations in version control.

For enterprise deployments, the Lifetime Agency Buyout provides unlimited seats, shared team lockfile generation, and automated pull-request checks that block plaintext API keys before merge.

Host Client	Config Path	Root Key
Cursor IDE	.cursor/mcp.json	mcpServers
Claude Desktop (macOS)	claude_desktop_config.json	mcpServers
Claude Desktop (Windows 11)	%APPDATA%Claudeclaude_desktop_config.json	mcpServers (cmd /c npx)
Claude Code CLI	~/.claude.json	claude mcp add
VS Code Copilot	.vscode/mcp.json	servers + inputs

FAQ · 常见问题

Why does Claude Desktop on Windows 11 fail with spawn npx ENOENT?

Claude Desktop on Windows spawns child stdio servers without invoking a shell, so npx.cmd cannot be resolved directly. Wrapping the command as “command”: “cmd” with args [“/c”, “npx”, “-y”, “<package>”] resolves ENOENT deterministically.

What is the difference between Cursor .cursor/mcp.json and VS Code .vscode/mcp.json?

Cursor nests server definitions under the top-level “mcpServers” key, whereas VS Code Copilot Agent Mode expects a top-level “servers” key with an explicit “type”: “stdio” or “http” field.