[BUG] Claude Code extension fails to activate on Windows — hardcoded Linux path in build

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?

Extension fails to activate with error: "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 was built on Linux CI (GitHub Actions) and has a hardcoded Linux path /home/runner/work/... baked into the Windows binary. This path doesn't exist on Windows machines, causing activation to fail completely.

What Should Happen?

Extension should activate successfully on Windows and display the Claude Code sidebar icon. Users should be able to sign in and use Claude Code within VS Code.

Error Messages/Logs

[Extension Host] 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'.

Steps to Reproduce

Steps to Reproduce:

1. Install the Claude Code VS Code extension (Anthropic.claude-code) on

Windows 10

1. Open VS Code with any project folder
2. Open Developer Tools (Help → Toggle

Developer Tools → Console tab)

1. Attempt to run any Claude Code command ▎ (e.g. open the sidebar, or run

claude-vscode.open.window via Command
Palette)

1. Observe the error in the console

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.136 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_