Parallels RAS MCP Server

Instructions

Implementation Reference

• src/tools/site-settings.ts:132-151 (registration)

  Registration of the ras_site_get_printing tool with the MCP server, including schema configuration and handler function
  server.registerTool( "ras_site_get_printing", { title: "Printing Settings", description: "Get printing configuration settings, including printer redirection, universal " + "printing options, and driver policies. Use this to troubleshoot print redirection " + "issues or review printing policy configuration.", annotations: READ_ONLY_ANNOTATIONS, inputSchema: {}, }, async () => { try { const data = await rasClient.get("/api/site-settings/printing"); return { content: [{ type: "text" as const, text: JSON.stringify(data, null, 2) }] }; } catch (err) { return { content: [{ type: "text" as const, text: sanitiseError(err, "Failed to retrieve printing settings") }], isError: true }; } } );
• src/tools/site-settings.ts:143-150 (handler)

  Handler function that fetches printing settings from the RAS API endpoint /api/site-settings/printing and returns formatted JSON data
  async () => { try { const data = await rasClient.get("/api/site-settings/printing"); return { content: [{ type: "text" as const, text: JSON.stringify(data, null, 2) }] }; } catch (err) { return { content: [{ type: "text" as const, text: sanitiseError(err, "Failed to retrieve printing settings") }], isError: true }; } }
• src/client.ts:128-166 (helper)

  RasClient.get() method used by the handler to make authenticated GET requests to the RAS API, handling authentication, retry on 401, and request timeouts
  async get(path: string): Promise<unknown> { // Ensure we have a valid session if (!this.authToken) { await this.login(); } const fetchOptions = { method: "GET" as const, headers: { ...this.headers, auth_token: this.authToken!, }, signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS), }; let response = await fetch(`${this.baseUrl}${path}`, fetchOptions); // Token may have expired — re-authenticate once and retry if (response.status === 401) { await this.login(); response = await fetch(`${this.baseUrl}${path}`, { ...fetchOptions, headers: { ...this.headers, auth_token: this.authToken!, }, signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS), }); } if (!response.ok) { const body = await response.text(); throw new Error( `RAS API error (HTTP ${response.status}) on ${path}: ${body.substring(0, 300)}` ); } return response.json(); }
• src/client.ts:43-54 (helper)

  sanitiseError helper function that sanitizes error messages by redacting sensitive information like auth tokens and passwords
  function sanitiseError(err: unknown, context: string): string { const raw = err instanceof Error ? err.message : String(err); // Remove anything that looks like a token or password value let sanitised = raw .replace(/auth_token[=:]\s*\S+/gi, "auth_token=[REDACTED]") .replace(/password[=:]\s*\S+/gi, "password=[REDACTED]"); // Truncate excessively long API response bodies if (sanitised.length > 500) { sanitised = sanitised.substring(0, 500) + "... (truncated)"; } return `${context}: ${sanitised}`; }