Add Desktop Extension (DXT) support

[nickwinder]

This PR adds support for packaging the Nutrient DWS MCP server as a Desktop Extension (DXT) - a new packaging format that makes installing MCP servers as simple as clicking a button. This addresses the core installation friction that has made MCP servers largely inaccessible to non-technical users.

Desktop Extensions solve critical user experience problems with MCP servers: eliminating the need for manual JSON configuration, removing dependency management headaches, and providing a seamless installation experience similar to traditional desktop applications.

Changes Made

DXT Build Infrastructure

• bin/build_dxt: Added comprehensive build script that creates signed DXT packages
  • Handles version substitution and git commit tracking
  • Copies all necessary files and production dependencies
  • Generates proper package-lock.json for reproducible builds
  • Automatically signs the package with self-signed certificate
  • Outputs versioned DXT files to dxt_output/ directory

Static Manifest Configuration - Details on the schema can be found at https://github.com/anthropics/dxt/blob/main/MANIFEST.md

• manifest.json: Added DXT manifest with comprehensive metadata
  • Defines extension identity, tools, and configuration requirements
  • Specifies user configuration for API key and sandbox directory
  • Includes platform compatibility and Node.js runtime requirements
  • Documents all available tools with descriptions

Tool Architecture Refactoring

• src/tool-definitions.ts: Extracted tool definitions into centralized module
  • This was a helper during development but does not affect the actual PR.

Development Dependencies

• @anthropic-ai/dxt: Added DXT tooling for packaging and signing

Testing

Additional Notes

We still need a real certificate to sign the DXT for submission

[nickwinder]

stale