ZV-2026-0200 · 2026-08-19 · mcp.stayker.com
mcp.stayker.com: Field cancellation_token was removed from cancel_booking input; consumers still sending it may be rejected or silently ignored.
breaking
What changed
Field cancellation_token was removed from cancel_booking input; consumers still sending it may be rejected or silently ignored. Field cancellation_token_expires_at was removed from cancel_booking output; consumers reading it will break. Field cancellation_token was renamed to cancellation_url_expires_at on cancel_booking. Enum value CONFIRMATION_REQUIRED removed from status on cancel_booking. Enum value cancelled removed from status on cancel_booking.
What to do
If your agents call mcp.stayker.com, pin the new snapshot, patch the affected call sites, and let a green contract check confirm the fix. If you don't use the changed tools, nothing is required, but the rest of the ecosystem just learned about it at the same moment you did.
The redline
− cancellation_token Field cancellation_token was removed from cancel_booking input; consumers still sending it may be rejected or silently ignored. − cancellation_token_expires_at Field cancellation_token_expires_at was removed from cancel_booking output; consumers reading it will break. − cancellation_token + cancellation_url_expires_at cancel_booking − status Enum value CONFIRMATION_REQUIRED removed from status on cancel_booking. − status Enum value cancelled removed from status on cancel_booking. − Cancel a hotel reservation. This is a two-step, server-confirmed action. The first call u… + Create a secure cancellation handoff for a hotel reservation. After verifying the guest, t… cancel_booking + cancellation_url Field cancellation_url was added to cancel_booking output. + status Enum value ACTION_REQUIRED added to status on cancel_booking. + status Enum value already_cancelled added to status on cancel_booking. − Search hotels by location and dates for exactly one room. Returns available properties wit… + Search hotels by location and dates for exactly one room, with check-in up to 340 days fro… search_hotels