# ifc-model mutation instructions
Scope: schema-agnostic transactional edits to records and values. Follow the crate `../../AGENTS.md`. Read `PLAN.md` only for
assigned task(s) `MODEL-MUT` and keep implementation state there.
## Owns
- explicit edit operations
- preflight/conflict checks
- atomic commit and index updates
## Does not own
- material/property/domain setters
- partial mutation on failure
- automatic schema repair
## Growth map
`edit.rs`, `transaction.rs`, `conflict.rs`. These source owners already compile as private scaffold modules. Replace a module's planned-owner marker with its first real contract and tests; do not add parallel placeholders. Every graph operation has deterministic order and explicit limits.