[BUG]

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?

Claude Code 403 - all local fixes exhausted

• Claude Code worked fine until morning of May 13, 2026
• Login reports success but every API call returns 403 status code (no body)
• Confirmed in both VS Code extension and terminal CLI
• Direct curl to api.anthropic.com works fine (req ID: req_011Cb4wgcwMUWe3n4sPXNLMb)
• Team/managed org plan — admin confirmed no policy changes
• Cleared: Keychain, ~/.claude/, ~/.claude.json, browser cookies for claude.ai and claude.com
• Service status shows operational
• No corporate network/VPN involved (WFH)
• Log shows: Failed to get auth headers: No API key available after successful token write

What Should Happen?

code should work normally after the OAUTH being successful.

Error Messages/Logs

Steps to Reproduce

1./login from claude code vscode extension

1. Login successfully on the redirected browser and authorize
2. Return back to the code console

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.142 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_