Skill tree

Ask the graph model: linear, branch, web, loadout-grid, hybrid, or existing.

Contract

Publish:

• stable tree_id and tree revision
• stable node_id for every node
• versioned prerequisite graph
• cost/resource references and unlock effects
• respec/refund policy
• persistence/migration behavior
• evidence for locked/unlocked boundary states

Ownership

This skill owns progression graph eligibility and unlock transaction intent. Currency/inventory owners settle costs, gameplay skills own the unlocked effects, and save systems own persistence bytes.