ZV-2026-0247 · 2026-08-21 · engine-production-3bdc.up.railway.app
engine-production-3bdc.up.railway.app: Type of requested_format on research_hook_evidence changed string → unset.
breaking
What changed
Type of requested_format on research_hook_evidence changed string → unset.
What to do
If your agents call engine-production-3bdc.up.railway.app, 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
− string + unset research_hook_evidence + formats Optional field formats was added to research_hook_evidence; may shift model behaviour. + requested_count_v2 Optional field requested_count_v2 was added to research_hook_evidence; may shift model behaviour. + schema_version Optional field schema_version was added to research_hook_evidence; may shift model behaviour. + source_requirements_v2 Optional field source_requirements_v2 was added to research_hook_evidence; may shift model behaviour. + requested_format Enum value null added to requested_format on research_hook_evidence.