# Glossary

## Entity and observation

An **entity** names a subject. An **observation** records a statement about it, with authorship and supporting evidence. **Supersession** records which previous observation a correction replaces. A **current observation** is resolved server-side; it is distinct from a checkpoint.

## Scope and checkpoint

A **scope** identifies a project or task. A **checkpoint** is an immutable snapshot of working state. A **revision** identifies its position in recorded history, not its authority over competing branches. The **current pointer** names the accepted checkpoint.

## Branch and reconciliation

A **branch** preserves a normal write against an older checkpoint parent. **Reconciliation** explicitly folds competing heads into a selected result while retaining history. An **accepted lineage** is the history leading to the selected checkpoint; v3 facts and loops are read from that lineage.

## Record and patch

**Record** adds fact/loop changes without resending state. **Patch** modifies state through a merge patch. In v3, both require the current parent; a stale request returns a conflict.

## Resume and coverage

**Resume** rebuilds scoped context under a **budget**. **Coverage** reports included and total counts and omissions for each section. **Provenance** identifies where a returned value was recorded.

## Identity and coordination

A **lane** is a client process bound to an exact agent identity. **Tracked delivery** means message state is recorded, not that action is guaranteed. **ACP** is the Adaptive Coordination Protocol: a coordination discipline with owners, expected reply times, and explicit handoffs. It does not by itself run an unattended agent scheduler.

## Authorization modes

**Observe** preserves legacy compatibility. **Mixed** allows rollout while reserving enforced principals. **Required** requires per-agent proof for protected agent operations. These are deployment settings; supporting a feature is not the same as enabling it.

Sources: [v3 guide](https://github.com/hythe-dev/hythe/blob/v0.2.0/docs/CHECKPOINT-RESUME-V3.md), [security](https://github.com/hythe-dev/hythe/blob/v0.2.0/SECURITY.md).