[Feature] /mcp reconnect-all: batch restart all MCP servers mid-session

Summary

When running Claude Code with many MCP servers (10+), network drops (VPN reconnects, SASE proxy resets, travel WiFi) disconnect multiple stdio servers simultaneously. Currently there's no way to reconnect them all at once — you have to run /mcp and retry each one individually.

Current behavior

• /mcp shows status of all servers and allows individual retry
• HTTP/SSE servers auto-reconnect with exponential backoff (up to 5 attempts)
• Stdio servers never auto-reconnect (see #43177)
• After a network event, you have to manually reconnect each server one at a time

Requested behavior

A command like /mcp reconnect-all or /mcp restart that:

1. Kills and restarts all stdio MCP server processes
2. Re-initiates connections to all HTTP/SSE servers
3. Reports status (success/failure count) once complete

Use case

I run 12+ MCP servers (Slack, Atlassian, Panther, OpsGenie, Okta, AWS, Glean, n8n, Snyk, etc.) for security operations. VPN reconnects happen multiple times per day (corporate SASE + AWS VPN). Each reconnect currently requires 5-12 individual /mcp retries, which breaks flow significantly.

Workaround

Currently the best workaround is exiting the session and starting fresh with --continue, which reconnects all servers on startup. But this loses any in-progress context compression state and is disruptive.

Related issues

• #43177 — MCP stdio servers never auto-reconnect after disconnect
• #54136 — Reconnect/restart MCP servers from Claude Code without restart
• #43789 — OAuth tokens expire, requiring manual reconnect

Environment

• Claude Code CLI on macOS
• 12 MCP servers (mix of stdio and SSE)
• Network: Corporate SASE (Fortra) + AWS VPN = frequent drops