Execute PowerShell Plugin

An OpenCode plugin that provides PowerShell script execution capabilities with built-in safety controls and permission management.

Usage

Register in opencode.json

Add the plugin to your OpenCode configuration. OpenCode expects the plugin key (singular) with a string array:

{
  "plugin": [
    "@ordis_co_th/[email protected]"
  ]
}

Tool

Once registered, the plugin provides one tool: execute_powershell.

• Required params: command, description
• Optional params: timeout_ms, workdir
• timeout_ms default: 120000 (2 minutes)
• workdir default: current OpenCode directory (context.directory)

Example Tool Call

{
  "tool": "execute_powershell",
  "params": {
    "command": "Get-Process",
    "workdir": "/path/to/workdir",
    "timeout_ms": 30000
  }
}

Permission Integration (ask / allow / deny)

This plugin uses OpenCode's native permission engine and asks for permission key execute_powershell before spawning any command.

{
  "permission": {
    "execute_powershell": {
      "*": "ask",
      "Get-Process*": "allow",
      "Get-ChildItem*": "allow",
      "Invoke-Expression*": "deny",
      "Remove-Item*": "deny"
    }
  }
}

OpenCode evaluates rules with "last matching rule wins", so put broad defaults first and specific overrides later.

External Directory Permission

If workdir resolves outside the active project/worktree boundary, the tool asks for OpenCode permission key external_directory using a recursive glob pattern. The tool also performs a best-effort scan of path arguments in common filesystem PowerShell commands (for example Get-Content, Set-Content, Copy-Item, Move-Item, Remove-Item, Set-Location) and asks external_directory for out-of-bound path targets.

{
  "permission": {
    "execute_powershell": "ask",
    "external_directory": "ask"
  }
}

Output Metadata Footer

Tool output includes a metadata footer:

<powershell_metadata>{...}</powershell_metadata>

Long output is truncated using OpenCode-compatible defaults (2000 lines or 50 KiB), and the full output is written to OpenCode's tool-output directory. The returned content includes a preview and the full output path.

Metadata fields:

• exitCode
• endedBy (exit, timeout, or abort)
• shell (pwsh, powershell, or unknown)
• resolvedWorkdir
• timeoutMs
• durationMs
• truncated (optional)
• outputPath (optional)

Platform and Security Notes

• Intended for Windows PowerShell command execution.
• Permission checks run before execution.
• For safer defaults, deny high-risk command patterns such as Invoke-Expression* and Remove-Item*.

Development

# Install dependencies
bun install

# Build the project
bun run build

# Run tests
bun test

# Check package contents
bun run package:check

Package Structure

• Entry Point: ./dist/index.js
• Type Definitions: ./dist/index.d.ts
• Export: ExecutePowerShellPlugin - Main plugin function

License

MIT