Generate editable claude_desktop_config.json templates with Windows cmd.exe /c npx wrappers (fixing spawn npx ENOENT), macOS Homebrew/nvm absolute paths, and Python uvx launch settings.
This is a template: replace every YOUR_USERNAME, verify the npx/uvx executable path, and keep only folders you want this server to access. Then save it in %APPDATA%\Claude\claude_desktop_config.json (Windows) or ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) and restart Claude Desktop. A valid JSON file does not prove that the server is installed or that its paths exist.
| Operating System / Runtime | Config File Location | Command Entry | Why It Prevents Disconnection |
|---|---|---|---|
| Windows 10/11 (Node.js npx) | %APPDATA%\Claude\claude_desktop_config.json | cmd with ["/c", "npx", "-y", "..."] | Resolves npx.cmd batch shim when GUI process spawns without shell |
| macOS Apple Silicon (Homebrew / nvm) | ~/Library/Application Support/Claude/claude_desktop_config.json | /opt/homebrew/bin/npx | Bypasses missing ~/.zshrc PATH in macOS GUI apps |
| Python MCP Server (uvx) | Same OS config path above | Absolute path to uvx / uvx.exe | Prevents spawn uvx ENOENT when user bin directory is not in GUI PATH |
Rate tables are a November 9, 2026 documentation snapshot with announced schedule changes shown where available. Calculators use stated assumptions and are estimates, not invoices or measured hardware benchmarks. Check actual usage categories, account terms, cache behaviour, runtime allocations and cloud endpoint rates for a production decision.
Primary Source: MCP · Node.js DocsWhy local Model Context Protocol (MCP) servers fail to launch with spawn npx ENOENT or Server disconnected in Claude Desktop, and how to fix claude_desktop_config.json on Windows (cmd /c wrapper), macOS, and Claude Code.
Primary Source: Ollama DocsHow to diagnose partial CPU/GPU memory splits with ollama ps, override Ollama's VRAM-based default context lengths (4k/32k/256k), and configure OLLAMA_CONTEXT_LENGTH, num_ctx, and CUDA_VISIBLE_DEVICES.