# Phase Handover — AF-Service-Snapshot (Service Snapshot Architecture)

| Field | Value |
| --- | --- |
| Phase ID | `ai-framework-service-snapshot` |
| Title | Service Snapshot Architecture |
| Status | Complete |
| Service(s) | N/A (documentation / process only) |
| Version | Framework service-snapshot-1.0 |
| Date | 2026-07-26 |
| ADR(s) | Extends [ADR-018](../architecture/adr/ADR-018.md), [ADR-019](../architecture/adr/ADR-019.md) (process; no new ADR) |

## Business Analysis Summary

| Item | Detail |
| --- | --- |
| Capabilities delivered | One compact YAML snapshot per service as primary runtime truth; eliminates repeated reconstruction from completed phase documents; mandatory regeneration after each Complete phase |
| Explicit non-goals honored | No business service code changes; no completed business phase retrofits; no pre-populated business snapshots |

## Enterprise Phase Discovery Summary (this docs phase)

| Item | Detail |
| --- | --- |
| Discovery Record location | This handover + [service-snapshot-policy.md](../ai-framework/service-snapshot-policy.md) |
| Gaps promoted & closed | Repeated multi-doc state reconstruction → service snapshot first; completed phase doc re-reads eliminated when snapshot valid |
| Exclusions | All business phases and services |
| CRUD-only rejected | N/A (process rule) |

## Enhancement Catalog

### New normative document

| Document | Purpose |
| --- | --- |
| [service-snapshot-policy.md](../ai-framework/service-snapshot-policy.md) | Required fields, execution entry, fallback reconstruction, regeneration rules, primary runtime truth |

### New snapshot infrastructure

| Path | Purpose |
| --- | --- |
| [docs/service-snapshots/](../service-snapshots/) | Snapshot storage directory |
| [docs/service-snapshots/_template.yaml](../service-snapshots/_template.yaml) | Machine-readable template |
| [docs/service-snapshots/README.md](../service-snapshots/README.md) | Index and policy link |

### Core execution upgrades

| Document | Enhancement |
| --- | --- |
| [runtime-read-policy.md](../ai-framework/runtime-read-policy.md) | Execution entry; snapshot in always-reload; Discovery mapping uses snapshot baseline |
| [context-cache-policy.md](../ai-framework/context-cache-policy.md) | Snapshot always reloads; superseded handovers cache-eligible |
| [master-prompt.md](../ai-framework/master-prompt.md) | Snapshot-first loading; regeneration on service extension |
| [development-loop.md](../ai-framework/development-loop.md) | Snapshot entry in Discovery; regeneration in Documentation Update; completion rule |
| [enterprise-phase-discovery.md](../ai-framework/enterprise-phase-discovery.md) | Baseline from snapshot; no completed phase doc reconstruction |
| [mandatory-phase-artifacts.md](../ai-framework/mandatory-phase-artifacts.md) | Artifact #43 Service Snapshot |
| [phase-handover.md](../ai-framework/phase-handover.md) | Service Snapshot Update section; next-phase entry uses snapshot |
| [quality-gates.md](../ai-framework/quality-gates.md) | Mandatory Service Snapshot gate + sign-off |

## Reusable Components

| Component | Location | Reuse notes |
| --- | --- | --- |
| Service Snapshot Policy | `docs/ai-framework/service-snapshot-policy.md` | Every service-scoped phase |
| Snapshot template | `docs/service-snapshots/_template.yaml` | Copy per service on first Complete phase |
| Service Snapshot gate | `docs/ai-framework/quality-gates.md` | Regeneration verification |

## Public APIs

N/A — documentation/process only.

## Events

N/A.

## Permissions

N/A.

## Extension Points

| Extension point | How to extend | Forbidden uses |
| --- | --- | --- |
| New snapshot field | Add to policy + template + regeneration procedure | Storing full OpenAPI or phase doc content in snapshot |
| New service | Create `<service>.yaml` on first Complete phase | Skipping snapshot gate |

## Known Limitations

- No business service snapshots pre-generated — first service phase after this upgrade builds initial snapshot.
- Snapshot summarizes state; full contracts remain in reference docs when triggered by read policy.
- Framework-only phases do not require a service snapshot file.

## Migration Notes

| Item | Detail |
| --- | --- |
| Alembic revision(s) | N/A |
| Upgrade steps | Next service-scoped Complete phase must regenerate `docs/service-snapshots/<service>.yaml` |
| Breaking changes | None for runtime; reduced doc fan-out for future phases |

## Dependencies

| Dependency | Type | Required for |
| --- | --- | --- |
| AF-Context-Cache-Policy | Docs | Incremental loading |
| AF-Runtime-Read-Policy | Docs | Tiered loading |
| AF-Discovery / ADR-019 | Docs | Discovery baseline |

## Boundary Compliance

- [x] No foreign service ownership implemented
- [x] No business logic duplication
- [x] No cross-DB access
- [x] No future-phase business functionality pulled forward
- [x] No business service code modified

## Service Snapshot Update

| Field | Value |
| --- | --- |
| Snapshot path | N/A (framework phase) |
| Snapshot version | N/A |
| Last updated | 2026-07-26 |
| Fields changed | Policy, template, gates, framework cross-links |

## Enterprise Completeness Sign-Off

- [x] Discovery completeness (snapshot-based baseline)
- [x] Business completeness (framework process)
- [x] Documentation completeness
- [x] Self Audit

## Definition of Done

- [x] service-snapshot-policy.md published
- [x] All listed framework docs updated
- [x] Service Snapshot quality gate added
- [x] Framework handover complete
- [x] No business code changes

## Next Phase Entry

1. [service-snapshot-policy.md](../ai-framework/service-snapshot-policy.md) execution entry order
2. Load `docs/service-snapshots/<service>.yaml` when present; build on first service Complete phase if missing
3. [runtime-read-policy.md](../ai-framework/runtime-read-policy.md) · [context-cache-policy.md](../ai-framework/context-cache-policy.md)
4. Resume business milestones per [next-steps.md](../next-steps.md) when explicitly requested

| Field | Value |
| --- | --- |
| Recommended next phase | Per [next-steps.md](../next-steps.md) (business track) — not started by this phase |
| Blockers for next phase | None; initial per-service snapshots created on next Complete phase per service |
| Entry checklist | Policies → snapshot → manifests → latest handover → Discovery → implement → regenerate snapshot |

## Completion Sign-Off

- [x] Service Snapshot Architecture integrated
- [x] Mandatory quality gate added
- [x] Framework handover complete
- [x] No TODO for claimed deliverables
- [x] No business service modifications

## Related Documents

- [Service Snapshot Policy](../ai-framework/service-snapshot-policy.md)
- [Runtime Read Policy](../ai-framework/runtime-read-policy.md)
- [Context Cache Policy](../ai-framework/context-cache-policy.md)
- [Phase Handover AF-Context-Cache-Policy](phase-af-context-cache-policy.md)
- [Phase Handover AF-Runtime-Read-Policy](phase-af-runtime-read-policy.md)
