Choose the owning interface

Start with the runtime owner of the behavior. Bind Core Read for lifecycle observations and Core Callbacks only when you need scheduled frame/phase work.

Feature	Interfaces	Boundary
Hand/HMD observer	Hands Read	Final poses at Core Presented; validity and generations required.
World pickup or consumable/throwable inventory handoff	Grab Read + Write	Queue a command and observe its terminal state; inventory handoff chooses an available hand.
Holster draw or inventory weapon switch	Weapon 1.1 Read + Write, Core scheduling	Capture the exact stack, choose the physical hand, and wait for the terminal result; retain an opposite-hand weapon with Toggle Drop controls.
Climbing or physical controls	Touch Read + Write, Grab Read; Collision as needed	Scoped target leases and explicit clear/yield cleanup.
Weapon inspection	Weapon and WeaponParts Read	Keep weapon-generation and source keys together.
Part manipulation	WeaponParts Read + Write	Separate target matching, drive publication and application readback.
Input gesture	Input Read; Write for suppression	Physical hand identity and raw levels are separate from weapon roles.
Native pose coordination	Animation Read + Write, Core callbacks	Narrow leased authority; clear before owner teardown.
Power Armor attachment	References Read, Grab Read + Write	Classification and animated anchor validation precede command admission.
External physics sensor	Collision Read + Write	Consumer owns body lifetime; clear scopes before destroying bodies.
Controller/jump observation	PlayerController Read; Write for jump	Native guarded jump only, no arbitrary locomotion or penetration API.
Diagnostic overlay	Diagnostics Write	Bounded copied data and expiring publications.
Configuration panel	Configuration Read + Write, optional RPS UI	Use the compiled catalog and ROCK's persistence service.

A native operation outside these contracts remains your plugin's responsibility. RPS Framework can support owned engine integration; a source key or body ID does not grant arbitrary native access.