# Golem Snapshot Restoration Effect

> Configures durable snapshots and restoration for Effect Golem agents. Use for recovery, schema state, custom bytes, or SQLite restoration.

- Skill: `golemcloud/golem-snapshot-restoration-effect` (Agent Skill)
- Install (CLI): `npx skillmds@latest add golemcloud/golem-snapshot-restoration-effect`
- Raw SKILL.md: https://api.skillmd.com/api/skills/golemcloud/golem-snapshot-restoration-effect/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: golemcloud (https://skillmd.com/u/golemcloud)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/golemcloud/golem-snapshot-restoration-effect

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# Snapshot restoration

Set `snapshotting: Snapshot.define({ schema, policy })` and use
`.implement({ init, methods, snapshot })`. `init(id)` exclusively infers runtime state. For a common
`Ref<State>` whose saved value matches the schema, use `snapshot: Snapshot.ref<Saved>()`. For a custom
representation use `{ save: state => Effect<Saved>, restore: (saved, context) => Effect<State> }`.
When SQLite databases are declared, add `databases: state => ({ declaredName: state.handle })` to
that strategy. The runtime restores database images before constructing methods.

Use `Snapshot.custom({ policy })` with implementation `save`/`restore` only for user-managed bytes.
Ordinary agents omit `snapshot`. External PostgreSQL, MySQL, and Ignite state is not included.

Use host-backed `Durability` combinators around external effects. Do not add compatibility migration
envelopes or legacy initialize/restore factories.