Claude Code sends extra fields (e.g. "title") in initialize params that
caused the server to reject the request due to DisallowUnknownFields.
Use lenient JSON decoding for protocol messages while keeping strict
validation for tool arguments. Also defer KWallet credential loading
from server startup to tool invocation time, and negotiate protocol
versions per MCP spec instead of rejecting unknown ones.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
