/schedule triggers produce blank sessions - all triggers broken

Description

All /schedule (RemoteTrigger) triggers are producing completely blank sessions. No output, no error messages, nothing is displayed when clicking on a run.

Environment

• Plan: Claude Max ($200/month)
• Environment IDs tried: env_01TJdrmnrdrxnSHDGUxnjQFT, env_01W8vH7Ry8w6PNdM3twvyxTU
• Model: claude-sonnet-4-6
• Allowed tools: Bash, Read, Write, Edit, Glob, Grep

What happened

• 3 triggers were working normally until ~2026-03-27
• After editing one trigger's prompt, ALL triggers stopped working (including ones never modified)
• Created a brand new trigger with a new environment ID and the simplest possible prompt (just a curl command) - still blank
• Deleted and recreated the trigger - still blank
• All execution history shows red circles (errors) but clicking them shows a blank session with no content

Steps to reproduce

1. Create a trigger via RemoteTrigger API with any prompt
2. Run it manually via action: "run"
3. Go to https://claude.ai/code/scheduled
4. Click on the trigger, click on the latest run
5. Session is completely blank - no agent output, no errors

Simplest failing case

{
  "name": "test",
  "cron_expression": "0 22 * * *",
  "job_config": {
    "ccr": {
      "environment_id": "env_01W8vH7Ry8w6PNdM3twvyxTU",
      "session_context": {
        "model": "claude-sonnet-4-6",
        "allowed_tools": ["Bash"]
      },
      "events": [{
        "data": {
          "uuid": "e1f2a3b4-c5d6-4e7f-8901-abcdef123456",
          "session_id": "",
          "type": "user",
          "parent_tool_use_id": null,
          "message": {
            "content": "Run: echo hello",
            "role": "user"
          }
        }
      }]
    }
  }
}

Even this minimal trigger produces a blank session.

Expected behavior

The agent should execute the prompt and show its output in the session.

Trigger IDs

• trig_014LzLqpciiAWmiUL59ppMWF (newly created, blank)
• trig_01H1vh8fH7qENGPjimpY33sg (never modified, was working, now blank)
• trig_01Fy5o8DpvVGSY4374Q1xdox (modified, blank)