[BUG] Scheduled triggers cannot access MCP connector tools

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:

MCP connectors (Supabase, Weclapp) attached to a scheduled trigger are not loaded into the agent's tool registry at runtime. The agent reports "MCP tools not available" and suggests local MCP setup instead.

What I tried:

Created trigger via API (RemoteTrigger) and via web UI — same result
Added MCP tool names to allowed_tools in session_context (e.g., mcp__Supabase__execute_sql) — no effect
Set permitted_tools on mcp_connections to explicit tool lists and to [] — no effect
Verified connector permissions in UI: read-only tools set to "Always allow", write tools set to approval-required
Removed git repository source to rule out auth interference — no effect
Created a fresh trigger entirely through the UI — same failure
Trigger IDs: trig_01Tvt7jqjfcsp29BAodNwAk3 (new, UI-created), trig_01BGiXHthAJCpCGokMVZRHKY (old, API-created, now disabled)

Environment: Claude Code VSCode extension, macOS

What Should Happen?

Expected: Agent sees MCP tools (execute_sql, weclapp_api_call, etc.) and can call them.

Error Messages/Logs

Actual: Agent cannot find MCP tools. Output: "The required MCP tools are not available in this session. They do not appear in the deferred tool registry."

Steps to Reproduce

Reproduction:

1. Create a scheduled trigger at claude.ai/code/scheduled
2. Attach OAuth MCP connectors (e.g., Supabase, Weclapp) via the Connectors tab
3. Set permissions to "Always allow" for read-only tools
4. Trigger a manual run

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.83 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_