How to add an MCP server to Cline

What Cline can run

• Local servers (stdio)
• Remote servers (HTTP)
• Remote servers (SSE)

504 of the 508 servers in the catalog run natively in Cline.

Step by step

1. Open the Cline sidebar → MCP Servers → Configure MCP Servers.
2. Add servers under `mcpServers`; give remote ones `type` and `url`.
3. Save — Cline restarts the server automatically.

Reloading: Cline reloads on save; use the restart button next to a server to retry it.

Example: the Filesystem server in Cline

The official reference server for file access. Replace the directory with the folder you want the assistant to see.

{
  "mcpServers": {
    "filesystem": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem",
        "/path/to/allowed/directory"
      ]
    }
  }
}

Troubleshooting

`npx` is not found, or the server exits immediately on Windows

Windows launches `npx` through cmd. Use `"command": "cmd"` with `"args": ["/c", "npx", "-y", "<package>"]`, and make sure Node.js 18+ is on the PATH of the user the client runs as.

`SyntaxError` or `Unsupported engine` when the server starts

Most MCP servers need Node.js 18 or newer (`node -v`). If you use nvm, the client may not see your shell's Node: point `command` at the absolute path of `npx`.

The server starts but every tool call fails with 401 or 403

Its API key is missing or wrong. Put it in the server's `env` block (or the header for remote servers) — never in a file you commit.

Official documentation: Cline MCP docs