[macOS] Console launch fails: ''default'' quoting broken in shell command

[ben1440]

Bug Description

On macOS (Apple Silicon, Sequoia 15.5), the PowerShell.MCP proxy fails to maintain a connection. The proxy spawns a Terminal.app window with pwsh, but the shell quoting for the -Command argument is broken — identical root cause to #39 (Linux), but affecting macOS.

The spawned command looks like:

pwsh -NoExit -WorkingDirectory '/Users/user' -Command '$global:PowerShellMCPProxyPid = 78022; $global:PowerShellMCPAgentId = ''default''; Import-Module PowerShell.MCP -Force; Remove-Module PSReadLine -ErrorAction SilentlyContinue'

The ''default'' is interpreted by bash/zsh as:

1. '' → empty string
2. default → executed as a bare command
3. '' → empty string

Result:

default: The term 'default' is not recognized as a name of a cmdlet, function, script file, or executable program.

The module partially loads but the $global:PowerShellMCPAgentId is never set correctly, the IPC back to the proxy fails, and the MCP connection drops.

Environment

• macOS: Sequoia 15.5, Darwin 24.6.0, ARM64 (Mac Mini M4)
• pwsh: 7.5.2 (Core), installed via .pkg at /usr/local/bin/pwsh
• Shell: zsh 5.9
• Terminal: Terminal.app
• Claude Code: CLI (latest)
• PowerShell.MCP: Tested 1.6.8, 1.7.2, and 1.7.6 — all affected

Steps to Reproduce

1. Install PowerShell.MCP on macOS ARM64
2. Register as MCP server in Claude Code: claude mcp add PowerShell /path/to/PowerShell.MCP.Proxy
3. Launch Claude Code
4. MCP shows "Connected" briefly, then tools become unavailable
5. A Terminal.app window opens with the default: The term 'default' is not recognized error

Expected Behavior

The proxy should correctly quote the -Command argument so that $global:PowerShellMCPAgentId is set to 'default' and the module initializes properly.

Suggested Fix

Same as #39 — use -EncodedCommand with Base64-encoded UTF-16LE to avoid shell quoting issues entirely. The fix in #39 was applied to the Linux launcher (PwshLauncherLinux.cs) but the macOS launcher still uses the broken '' quoting.

Alternatively, the command could be written to a temp .ps1 file and executed with -File.

[mikenelson-io]

Experiencing this as well. Totally broken on MacOS.

[yotsuda]

@ben1440 @mikenelson-io — thanks for the report and confirmation! The fix (659ef8b + 3f6b7ca) did ship in v1.7.7, but I forgot to mention it in the release notes. Just updated the notes to credit you both. Thanks again for the precise repro and the pointer to #39 — that made the fix straightforward!