[BUG] Windows: clicking Claude icon gives "command 'claude-vscode.editor.openLast' not found" - reinstalling VS Code and extension doesn't fix it

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Environment:

• OS: Windows 11
• VS Code version: latest
• Claude Code CLI version: 2.1.51

Bug Description:
Clicking the Claude icon in the VS Code activity bar gives error: command 'claude-vscode.editor.openLast' not found. The extension shows "Activating..." forever and never loads.

Root Cause Found:
In Developer Tools console, this error appears:
Activating extension 'Anthropic.claude-code' failed: The argument 'filename' must be a file URL object, file URL string, or absolute path string. Received 'file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs'

The extension has a hardcoded Linux path (/home/runner/work/...) baked into it which doesn't resolve on Windows.

Steps to Reproduce:

1. Install Claude Code CLI on Windows
2. Open VS Code
3. Click the Claude icon in the activity bar

Expected: Claude Code panel opens
Actual: Error: command 'claude-vscode.editor.openLast' not found

Note: CLI works fine in terminal (claude command works). Only the visual panel is broken.

What Should Happen?

Clicking the Claude icon in the VS Code activity bar should open the Claude Code visual panel successfully without any errors.

Error Messages/Logs

Steps to Reproduce

1. Install Claude Code CLI on Windows: npm install -g @anthropic-ai/claude-code
2. Open VS Code
3. Run "claude" in VS Code terminal (auto-installs the extension)
4. Click the Claude icon in the VS Code activity bar (top left)
5. Error appears: "command 'claude-vscode.editor.openLast' not found"
6. Open Developer Tools (Ctrl+Shift+P → "Developer: Toggle Developer Tools")
7. Check Console tab — shows the real error: extension activation failed due to hardcoded Linux path

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.51 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

The root cause is a hardcoded Linux path in the extension package:

file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs

This path does not exist on Windows, causing the extension to fail activation entirely.

Workaround: Claude CLI works fine in the terminal ("claude" command). Only the visual panel is broken.

Tried to fix by:

<img width="1433" height="942" alt="Image" src="https://github.com/user-attachments/assets/385a3ec5-65de-4221-91cc-3c0833d5abe8" />

• Uninstalling and reinstalling Claude Code CLI
• Uninstalling and reinstalling VS Code completely (including deleting all AppData folders)
• Updating Claude Code CLI to latest version (2.1.51)
• Nothing worked — this appears to be a packaging bug on Anthropic's side