fix(mcp): use a more generic folder to put mcp filesystem root (#1413)

Currently the MCP server attempts to access a folder under
`${HOMEDIR}/Desktop` which is not portable accross different OSes.

This PR proposes to change the `Desktop` part to `.mcp` which is OS
agnostic and ensure the folder exists when spawning.

---------

Co-authored-by: Julien Chaumond <[email protected]>

Author: mfuntowicz

packages/mcp-client/cli.ts

@@ -12,12 +12,13 @@ import { version as packageVersion } from "./package.json";
 const MODEL_ID = process.env.MODEL_ID ?? "Qwen/Qwen2.5-72B-Instruct";
 const PROVIDER = (process.env.PROVIDER as InferenceProvider) ?? "nebius";
 const ENDPOINT_URL = process.env.ENDPOINT_URL ?? process.env.BASE_URL;
+const MCP_EXAMPLER_LOCAL_FOLDER = process.platform === "darwin" ? join(homedir(), "Desktop") : homedir();
 
 const SERVERS: StdioServerParameters[] = [
 	{
 		// Filesystem "official" mcp-server with access to your Desktop
 		command: "npx",
-		args: ["-y", "@modelcontextprotocol/server-filesystem", join(homedir(), "Desktop")],
+		args: ["-y", "@modelcontextprotocol/server-filesystem", MCP_EXAMPLER_LOCAL_FOLDER],
 	},
 	{
 		// Playwright MCP
@@ -30,6 +31,7 @@ if (process.env.EXPERIMENTAL_HF_MCP_SERVER) {
 	SERVERS.push({
 		// Early version of a HF-MCP server
 		// you can download it from gist.github.com/julien-c/0500ba922e1b38f2dc30447fb81f7dc6
+		// and replace the local path below
 		command: "node",
 		args: ["--disable-warning=ExperimentalWarning", join(homedir(), "Desktop/hf-mcp/index.ts")],
 		env: {