[BUG] RemoteTrigger tool returns HTTP 401 despite valid authentication

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?

## Description
The RemoteTrigger tool consistently returns HTTP 401 Authentication Failed
when attempting to create a scheduled trigger via Claude Code CLI, even
though the account has access to claude.ai/code/scheduled.

## Steps to reproduce

1. Use the schedule skill in Claude Code
2. Ask Claude to create a remote trigger
3. Claude calls RemoteTrigger with action: "create"
4. Returns: HTTP 401

{"type":"error","error":{"type":"authentication_error","message":"Authentication failed"}}

What Should Happen?

## Expected behavior
Trigger is created successfully.

Error Messages/Logs

Steps to Reproduce

## Steps to reproduce

1. Use the schedule skill in Claude Code
2. Ask Claude to create a remote trigger
3. Claude calls RemoteTrigger with action: "create"
4. Returns: HTTP 401

{"type":"error","error":{"type":"authentication_error","message":"Authentication failed"}}

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

4.6

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

## Environment

• Claude Code CLI
• OS: Windows 11
• Shell: Anaconda Prompt / PowerShell
• Model: claude-sonnet-4-6
• Account has access to claude.ai/code/scheduled