[BUG] Tools of a custom MCP server are visible on claude.ai/code but not via Claude Code in mobile app

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?

I have a custom MCP server connected, called "woc".

It is accessible on desktop web via claude.ai/code, but appears to be inaccessible / unusable on the Claude Code mobile app.

Compare the two sessions:
1) Desktop web https://claude.ai/code/session_01HFNQev4FAZW5TxQcvejUMo - works fine, lists the tools that the MCP server exposes.
2) Exact same query initiated from Claude Code mobile app (on Android, Pixel 9 Pro) https://claude.ai/code/session_01H8cTx3eX74e8jzMwjQvcGG - shows that no tools from the "woc" MCP server are visible to ToolSearch.

I have tried disconnecting and reconnecting the server from my mobile app and it hasn't helped.

This appears to be an issue specific to where the session is initiated - when I pick the second session on claude.ai/code and issue a query from desktop web, it still shows no tools from the MCP server being accessible.

What Should Happen?

Tools from the connected MCP server should be accessible to sessions initiated from Claude Code in the mobile app.

Error Messages/Logs

Steps to Reproduce

1. Create and deploy a custom MCP server with a few tools (or, I suppose, connect to any MCP server)
2. Connect it to Claude Code
3. Open Claude Code in the mobile app
4. Ask what tools are available from that server

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Android app version 1.260416.20

Platform

Other

Operating System

Other

Terminal/Shell

Other

Additional Information

Session initiated from claude.ai/web:
<img width="1048" height="860" alt="Image" src="https://github.com/user-attachments/assets/9ee0a8ef-c25c-4c70-9a9f-a068c8209016" />

Session initiated from Claude Code Android app (and then opened to take screenshot in claude.ai/web):
<img width="1041" height="854" alt="Image" src="https://github.com/user-attachments/assets/34801eb5-29cd-4f8b-b7c8-d2bdd563b85e" />