name: effector-storage description: Choose and implement effector-storage persistence patterns for Effector apps. Use when tasks involve persist/createPersist usage, selecting adapters (local/session/query/broadcast/storage/asyncStorage/memory/nil/log), configuring clock/pickup/context/keyPrefix, validating data with contracts, handling done/fail/finally flows, SSR-safe adapter fallback with either, or debugging sync and serialization issues.

Effector Storage Skill

Use this skill to design, implement, and debug effector-storage integrations with predictable runtime behavior.

Workflow

1. Classify the request:

• adapter-choice: pick the right adapter for environment and data behavior.
• integration: wire persist/createPersist into existing model flow.
• contracts-errors: validate storage payloads and route failures.
• sync-debug: investigate cross-tab/query/broadcast synchronization issues.
• ssr-fallback: make persistence safe across browser/server runtimes.

2. Load references progressively:

• Start with references/core-patterns.md.
• Add references/adapter-matrix.md when adapter selection/configuration is needed.
• Add references/tools-and-composition.md for async, either, farcached, or composition recipes.
• Add references/contracts-and-errors.md for contracts and error channels.
• End with references/pitfalls-and-checklist.md before finalizing.

3. Build answer contract:

• Start with a concrete adapter decision and why.
• Provide a minimal working snippet with explicit key strategy.
• List behavior caveats (init timing, sync limits, validation behavior).
• Add verification steps/tests for the chosen flow.

Defaults

• Target effector-storage v7.x behavior.
• Prefer explicit key over implicit store names for portability.
• Prefer declarative Effector wiring around persist (sample/clock/context units).
• Keep payloads plain and serialization stable (deserialize(serialize(x))).

Guardrails

• Do not omit both key and store name.
• Do not use source === target for non-store units.
• Do not assume pickup still performs automatic initial restore (it disables it).
• Do not assume contract validation prevents writes; invalid values can be persisted and then reported via fail.
• Do not treat broadcast as durable storage; it is sync-only messaging.

Practical Extras Boundary

For adapters from effector-storage-extras, reuse the same adapter contract and decision flow from this skill, but verify exact API/options in that repository before coding.