deepseek-harness/packages/storage/storage

@deepseek-ai/dsh-storage

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Storage hub (ctx.storage) for non-session data: a named backend registry plus mounted data-form facilities. The hub performs no IO itself — backends own media, and data forms own semantics. The storage family overview maps those packages; the domain KV storage Agent Note records the design rationale.

Shape

• ctx.storage.backend — name → backend table. Multiple backends stay mounted side by side (json, sqlite); which backend serves a consumer is that consumer's configuration (the domain layer's route table), never a hub-global choice. register() returns the disposer; duplicate names and unknown lookups fail loud.
• ctx.storage.mount(form, facility) / ctx.storage.form(form) — data-form mounting. StorageForms is merge-extensible; the domain layer merges domain and is reached as ctx.storage.domain.
• A backend owns one medium and exposes the data-shape facets it supports. kv is the current facet; src/backend.ts owns its exact contract.

Model Experience

Backend and form registrations

What the model sees

Nothing. ctx.storage is a host-side registration table; the hub registers no tools, injects no prompts, and writes no session events.

Token effect

Zero direct tokens on every request.

KV Cache effect

Independent of live requests: the hub never touches a request prefix, so it cannot invalidate provider cache reuse.

Known Limitations and Deferred Work

• kv is the only data shape — backends currently have one facet to implement.
• Forms resolve lazily — reading ctx.storage.domain before the domain plugin mounts throws form-not-mounted; assemblies order plugins accordingly (misconfiguration fails loud rather than silently deferring).