### Preflight Checklist - [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) 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 on Windows 11.

[BUG] VS Code extension activation fails on Windows 2.1.51

Status Fixed / completed

Reported on v2.1.51

Maintainer reply None cached

Workaround ✓ Mentioned in thread ↓

Activity 5 comments · opened Feb 24, 2026 · closed Feb 25, 2026

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 on Windows 11.
Error in Developer Tools console:
Activating extension 'Anthropic.claude-code' failed:
Received 'file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs'.

This causes: Error: command 'claude-vscode.editor.openLast' not found

Version: 2.1.51-win32-x64
OS: Windows 11

What Should Happen?

Extension should activate successfully and register commands including claude-vscode.editor.openLast.

Error Messages/Logs

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'.

Error: command 'claude-vscode.editor.openLast' not found

Steps to Reproduce

Install Claude Code VS Code extension 2.1.51 on Windows 11
Open VS Code
Error appears immediately on startup

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Unknown

Claude Code Version

2.1.51-win32-x64

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_

View original on GitHub ↗

6 Comments

github-actions[bot] · 7 months ago

Found 3 possible duplicate issues:

This issue will be automatically closed as a duplicate in 3 days.

If your issue is a duplicate, please close it and 👍 the existing issue instead
To prevent auto-closure, add a comment or 👎 this comment

🤖 Generated with Claude Code

thoomi2009 · 7 months ago

升级到 2.1.52 同时升级一下插件就OK

adamrossmyers-coder · 7 months ago

Confirming this issue persists in v2.1.55 (win32-x64). The hardcoded CI paths were not fixed.

Details

extension.js in v2.1.55 contains 3 hardcoded references to the CI build path:

createRequire("file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs") (~byte 438942)
fileURLToPath("file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs") (~byte 844944)
__dirname="/home/runner/work/claude-cli-internal/claude-cli-internal/packages/claude-vscode/src/extension" (~byte 1045972)

Workaround

Manually patching all 3 resolves the issue and the extension activates successfully:

# Backup first
cp extension.js extension.js.bak

# Fix createRequire/fileURLToPath paths
sed -i 's|file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs|file:///c:/path/to/your/extension/extension.js|g' extension.js

# Fix __dirname
sed -i 's|__dirname="/home/runner/work/claude-cli-internal/claude-cli-internal/packages/claude-vscode/src/extension"|__dirname=require("path").dirname(__filename)|g' extension.js

Replace c:/path/to/your/extension/ with your actual extension path (e.g., c:/Users/<you>/.vscode/extensions/anthropic.claude-code-2.1.55-win32-x64/).

Environment: Windows 11 Home 10.0.26200, VS Code latest stable, extension v2.1.55 win32-x64.

samtuckerdavis · 7 months ago

Confirming regression in v2.1.55 (win32-x64) + complete fix

This issue persists in v2.1.55. The extension still ships with 3 hardcoded Linux CI build paths in extension.js that crash Module.createRequire() on Windows.

Error

TypeError: 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'
    at Module.createRequire (node:internal/modules/cjs/loader:1915:13)
    at Object.<anonymous> (extension.js:45:4848)

Root cause

The CI build (home/runner/work/claude-cli-internal/) bakes absolute Linux paths into the minified bundle in 3 places:

BE.createRequire("file:///home/runner/work/.../sdk.mjs") — crashes on activation (line 45)
JE.fileURLToPath("file:///home/runner/work/.../sdk.mjs") — crashes on agent SDK invocation (line 100)
__dirname="/home/runner/work/.../packages/claude-vscode/src/extension" — wrong directory resolution

Fix (bash, works in Git Bash / WSL / MSYS2)

EXT="$USERPROFILE/.vscode/extensions/anthropic.claude-code-2.1.55-win32-x64/extension.js"

# Backup
cp "$EXT" "$EXT.bak"

# Fix 1: createRequire with invalid Linux URL → use __filename
sed -i 's|BE.createRequire("file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs")|BE.createRequire(__filename)|g' "$EXT"

# Fix 2: fileURLToPath with invalid Linux URL → use __filename directly
sed -i 's|JE.fileURLToPath("file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs")|__filename|g' "$EXT"

# Fix 3: hardcoded __dirname → derive from __filename
sed -i 's|__dirname="/home/runner/work/claude-cli-internal/claude-cli-internal/packages/claude-vscode/src/extension"|__dirname=require("path").dirname(__filename)|g' "$EXT"

Then reload: Ctrl+Shift+P → Developer: Reload Window

Suggested build fix

The build pipeline should replace these paths with platform-agnostic equivalents (__filename, __dirname, import.meta.url) before bundling. This has now regressed across at least v2.1.51, 2.1.53, and 2.1.55.

Environment: Windows 11 Pro 10.0.26200, VS Code latest stable, Claude Code v2.1.55 win32-x64

shawnm-anthropic · 7 months ago

Thank you for your patience, v2.1.56 fixes the VS Code crash.