[BUG] Deleted routine still occasionally triggers and sends messages to webhook

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

After deleting a Claude Code Routine, it continues to occasionally send messages to a Google Chat webhook.

Steps to reproduce

1. Created a Routine to send daily weather reports to a Google Chat webhook
2. The routine was unreliable (sometimes sent, sometimes didn't)
3. Deleted the routine via the Claude Code interface
4. Confirmed deletion: /schedule list shows "No routines exist yet", and https://claude.ai/code/routines also shows empty
5. Despite this, messages are still occasionally being sent to the Google Chat webhook

Expected behavior

After deleting a routine, all scheduled executions should stop immediately.

Actual behavior

The deleted routine continues to trigger occasionally (not on a regular schedule), suggesting residual tasks remain in the server-side queue even after deletion.

Environment

• Claude Code web (claude.ai/code)
• Routine type: scheduled daily weather report
• Destination: Google Chat webhook

What Should Happen?

After a routine is deleted, all scheduled executions should stop immediately. The routine should no longer trigger or send any messages to configured webhooks.

Error Messages/Logs

Steps to Reproduce

1. Create a Routine to send a scheduled message (e.g. daily weather report) to a Google Chat webhook
2. Notice the routine is unreliable — sometimes sends, sometimes doesn't
3. Delete the routine via the Claude Code interface
4. Verify deletion: run /schedule list → shows "No routines exist yet"
5. Also confirm at https://claude.ai/code/routines → shows empty
6. Despite full deletion confirmed on both CLI and Web UI, messages continue to occasionally arrive at the Google Chat webhook

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

 2.1.150 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_