v4.2.0

imputnet/cobaltv4.2.0Jul 20, 2025by ravitemer

AI Summary

Adds full support for VS Code configuration format and enhances environment variable resolution with VS Code compatibility.

Key Highlights

Full `.vscode/mcp.json` configuration support with new `servers` key
Support for VS Code environment variable syntax (e.g., `${env:VARIABLE_NAME}`)
JSON5 support for configuration files (comments and trailing commas)
Seamless migration path for existing `.vscode/mcp.json` files

New Features

VS Code Configuration Compatibility
Enhanced Environment Variable Resolution
JSON5 Support

Full Release Notes


### Added

- **VS Code Configuration Compatibility**: Full support for `.vscode/mcp.json` configuration format
  - Support for `"servers"` key alongside existing `"mcpServers"` key
  - VS Code-style environment variable syntax: `${env:VARIABLE_NAME}`
  - VS Code predefined variables: `${workspaceFolder}`, `${userHome}`, `${pathSeparator}`, `${workspaceFolderBasename}`, `${cwd}`, `${/}`
  - VS Code input variables via `MCP_HUB_ENV`: support for `${input:variable-id}` syntax
  - JSON5 support for config files: comments and trailing commas now allowed
  - Seamless migration path: existing `.vscode/mcp.json` files work directly with MCP Hub

### Enhanced

- **Configuration System**: Enhanced environment variable resolution with VS Code compatibility
  - Proper priority system: predefined variables → process.env → MCP_HUB_ENV
  - Predefined variables available for placeholder resolution but not passed to server environments
  - Comprehensive test coverage for all VS Code variable types and scenarios