Thread Model

Thread is the persisted conversation and state history entity.

Fields

• id: thread identifier
• resource_id: optional ownership key for listing/filtering
• parent_thread_id: lineage for delegated/sub-agent runs
• messages: ordered message history
• state: base snapshot value
• patches: tracked patch history since base snapshot
• metadata.version: persisted version cursor

Core Methods

• Thread::new(id)
• Thread::with_initial_state(id, state)
• with_message / with_messages
• with_patch / with_patches
• rebuild_state()
• replay_to(index)
• snapshot()

Persistence Coupling

Storage append operations consume ThreadChangeSet plus VersionPrecondition.