# core/sessions — AGENTS.md

## Purpose

Session lifecycle management: defines session state, status transitions, approval mode, bound profile/workspace, and the projector/reducer/repository stack for tracking active and historical sessions.

## Ownership

CORREX kernel team.

## Local Contracts

- `Session` — core session domain type with id, status, bound profile and workspace.
- `SessionState` rebuilt from `SessionEvents` via `DefaultSessionReducer` + `SessionProjector`.
- `DefaultSessionRepository` wraps `EventReplayer<SessionState>`.
- `SessionStatus` — enum of lifecycle states (e.g. PENDING, RUNNING, COMPLETE, FAILED).
- `ApprovalMode` — per-session approval policy binding (AUTO, MANUAL, etc.).
- `BoundAgentInstructions` / `BoundProfile` / `BoundProjectProfile` / `BoundWorkspace` — types capturing what was bound to the session at launch time; these are immutable once set.
- `SessionSummary` / `SessionSummaryProjector` — lightweight projection for listing sessions without full state replay.
- `SessionCounterProjection` / `SessionCounterState` — cross-session counter projection.
- `TransitionResult` — outcome type for session state transitions.

## Work Guidance

- Follow the standard Events→State→Reducer→Projector→Repository pattern (see `core/AGENTS.md`).
- `DefaultSessionReducer` only does `state.copy(...)`. No lifecycle decision logic in the reducer.
- Bound types (`BoundProfile`, `BoundWorkspace`, etc.) are immutable once written to the event log. Do not mutate them post-bind.

## Verification

```bash
./gradlew :core:sessions:test --rerun-tasks
```

Tests in `testing/projections/` (DefaultSessionReducerTest) and `testing/replay/` (SessionReplayTest, SessionEmptyReplayTest).

## Child DOX Index

No child AGENTS.md (leaf module).