[BUG] Gmail MCP integration (gmail.mcp.claude.com) not loading in Claude Code CLI despite being connected on claude.ai

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?

Body:
## Summary
Gmail MCP integration is connected on claude.ai but does not load in Claude Code CLI sessions.
Google Calendar MCP (gcal.mcp.claude.com) — connected identically — works fine in the same session.

## Environment

• Claude Code CLI (terminal)
• macOS
• MCP integrations connected via claude.ai account (not local ~/.claude/settings.json)

## Steps to Reproduce

1. Connect both Gmail and Google Calendar integrations on claude.ai
2. Open Claude Code in terminal
3. Google Calendar tools are available (mcp__claude_ai_Google_Calendar__gcal_*)
4. Gmail tools are not available — ToolSearch returns no Gmail-related tools

## Expected Behavior
Gmail MCP tools should load in Claude Code CLI sessions the same way Google Calendar tools do,
since both integrations are connected via the same claude.ai account.

## Actual Behavior
Gmail MCP tools are absent from the session. mcpServers in ~/.claude/settings.json is empty {},
confirming the integrations are being injected via the cloud account — but only Calendar comes through, not Gmail.

## Workaround
None found. Manually adding via settings.json is not viable as the hosted MCP server config is not publicly
documented.

What Should Happen?

Body:
## Summary
Gmail MCP integration is connected on claude.ai but does not load in Claude Code CLI sessions.
Google Calendar MCP (gcal.mcp.claude.com) — connected identically — works fine in the same session.

## Environment

• Claude Code CLI (terminal)
• macOS
• MCP integrations connected via claude.ai account (not local ~/.claude/settings.json)

## Steps to Reproduce

1. Connect both Gmail and Google Calendar integrations on claude.ai
2. Open Claude Code in terminal
3. Google Calendar tools are available (mcp__claude_ai_Google_Calendar__gcal_*)
4. Gmail tools are not available — ToolSearch returns no Gmail-related tools

## Expected Behavior
Gmail MCP tools should load in Claude Code CLI sessions the same way Google Calendar tools do,
since both integrations are connected via the same claude.ai account.

## Actual Behavior
Gmail MCP tools are absent from the session. mcpServers in ~/.claude/settings.json is empty {},
confirming the integrations are being injected via the cloud account — but only Calendar comes through, not Gmail.

## Workaround
None found. Manually adding via settings.json is not viable as the hosted MCP server config is not publicly
documented.

Error Messages/Logs

Steps to Reproduce

Body:
## Summary
Gmail MCP integration is connected on claude.ai but does not load in Claude Code CLI sessions.
Google Calendar MCP (gcal.mcp.claude.com) — connected identically — works fine in the same session.

## Environment

• Claude Code CLI (terminal)
• macOS
• MCP integrations connected via claude.ai account (not local ~/.claude/settings.json)

## Steps to Reproduce

1. Connect both Gmail and Google Calendar integrations on claude.ai
2. Open Claude Code in terminal
3. Google Calendar tools are available (mcp__claude_ai_Google_Calendar__gcal_*)
4. Gmail tools are not available — ToolSearch returns no Gmail-related tools

## Expected Behavior
Gmail MCP tools should load in Claude Code CLI sessions the same way Google Calendar tools do,
since both integrations are connected via the same claude.ai account.

## Actual Behavior
Gmail MCP tools are absent from the session. mcpServers in ~/.claude/settings.json is empty {},
confirming the integrations are being injected via the cloud account — but only Calendar comes through, not Gmail.

## Workaround
None found. Manually adding via settings.json is not viable as the hosted MCP server config is not publicly
documented.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code CLI: v2.1.90

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_