**Environment:** Claude Code VS Code extension, Windows 10 Pro 19045, model Opus 5.5. **Steps:** 1. Long session (with /compact in between). Any Gmail tool call (search_threads, list_labels) returns: `MCP server "claude.ai Gmail" session expired`. 2. On claude.ai the Gmail connector shows as CONNECTED. 3. Ran `/mcp` → Reconnect on "claude.ai Gmail". 4. After reconnecting, the session reports the Gmail server disconnected and all its tools are removed. ToolSearch returns "No matching deferred to

[BUG] claude.ai Gmail connector: "session expired" and tools vanish after /mcp Reconnect (VS Code, Windows)

Status Open

Maintainer reply None cached

Activity 0 comments · opened Oct 4, 2026

Environment: Claude Code VS Code extension, Windows 10 Pro 19045, model Opus 5.5.

Steps:

Long session (with /compact in between). Any Gmail tool call (search_threads, list_labels) returns: MCP server "claude.ai Gmail" session expired.
On claude.ai the Gmail connector shows as CONNECTED.
Ran /mcp → Reconnect on "claude.ai Gmail".
After reconnecting, the session reports the Gmail server disconnected and all its tools are removed. ToolSearch returns "No matching deferred tools found", while /mcp still shows it as connected.

Expected: after Reconnect, the Gmail tools should be available again in the same session without starting a new conversation.

Actual: the connector is unusable for the rest of the session.