MCP server does not reload cookies from --cookie-file after external session refresh

[ChMueller001]

Problem

When the BTP ABAP session expires and cookies are refreshed externally
(e.g. via vsp --browser-auth --cookie-save cookies.txt as a separate
process), the already-running MCP server (vsp --cookie-file cookies.txt --mode focused --keepalive 60s) continues returning HTML IAS redirect
responses for all tool calls — even after cookies.txt is updated on disk.

The MCP server loads cookies once at startup and never reloads from --cookie-file.

Steps to reproduce

1. Start vsp as MCP server with --cookie-file
2. Wait for BTP session to expire (tools return HTML IAS redirect)
3. Refresh: vsp --url <btp-url> --browser-auth --cookie-save cookies.txt --keepalive 0s
4. Browser login completes, cookies.txt updated
5. Call any MCP tool → still returns HTML (stale in-memory cookies)

Expected behavior

MCP server detects expired session (ICMENOSESSION / HTML redirect) and
reloads cookies from --cookie-file automatically, without requiring restart.

Workaround

Restart the Claude Code session (restarts MCP server process).

Environment

• BTP ABAP Cloud eu10, IAS SSO
• Windows 11, Claude Code desktop app