# @deepseek-ai/dsh-workspace

English | [中文](README.zh.md)

Workspace entity registry (`ctx.workspace`) for the DeepSeek Harness: durable workspace records, stable workspace order, and a newest-first candidate session index stored through the domain data form. Consumers see the `Workspace` interface; the entity implementation stays package-private.

The entity/storage rationale lives in the [domain Agent Note](../../../.agents/notes/proposed/architecture/2026-07-24-domain-kv-storage-and-workspace.md); header-only bootstrap and GUI ordering live in the [Workspace UI product-flow Agent Note](../../../.agents/notes/implemented/feature/2026-07-25-workspace-ui-product-flow.md).

## Shape

- `ctx.workspace.create(path, title?)` — canonicalizes `path` via `fs.realpath`, rejects a nonexistent or non-directory path, creates at most one record per canonical path, and prepends a new record to durable workspace order. Repeated calls for that path return the existing workspace without changing its title; a different path cannot create a duplicate title.
- `ctx.workspace.get(id)` / `list()` / `resolveByPath(path)` — cache-served lookups. `list()` is synchronous and follows durable registry order; `resolveByPath` is async because it applies the same `realpath` canon and rejects a missing path rather than creating it.
- `ctx.workspace.delete(id)` — removes only the Workspace registration, its durable order entry, and its session account. Unknown ids return `false`; a removed record returns `true`. The directory, user files, live Sessions, and persisted session logs are never touched, so those Sessions become Ungrouped. A table-write failure restores the prior order and published entity.
- `Workspace.attachSession(id)` — validates a live or persisted session header cwd against the workspace path and prepends a new id. Unknown sessions, absent/unresolvable/non-directory cwd values, and mismatches reject without writing. `detachSession` removes only the candidate index entry.
- `ctx.workspace.touchSession(id)` — moves only that validated, accounted session to the front. Ungrouped or filtered sessions are no-ops, and workspace order never changes.
- `Workspace.sessionIds` — synchronous id-plus-canonical-cwd membership projection in durable candidate order. Missing headers, invalid cwd values, and mismatches are filtered; the next workspace mutation prunes them. A medium indexing one session under two workspaces, claiming one path from two records, or diverging from durable workspace order rejects at startup.
- `Workspace.status()` — uncached directory check, `'ok' | 'missing-dir'`; a missing directory never mutates the record.

`storageDomain` and `sessionPersistence` are required startup dependencies. An unavailable peer leaves the plugin pending and cannot commit an empty initialized marker. On the first successful start, the registry calls `SessionPersistence.list()` and uses only header `id`, `cwd`, and `createdAt` to group valid historical directories and persist initial order; it never reads event bodies. The initialized marker is written last, so partial bootstrap writes are reused safely after restart. Later cwd-only sessions remain Ungrouped.

Create and delete persist an explicit pending-mutation marker before their record and order can diverge. Startup completes only the marked mutation, then clears the marker; an unmarked order/table mismatch remains unexplained corruption and fails loud. Deleting and re-registering the same path creates a fresh Workspace id and does not automatically re-adopt the retained Sessions.

## Model Experience

### Workspace records and session accounts

#### What the model sees

Nothing. `ctx.workspace` serves workspace records to host-side consumers only: the package registers no tools, injects no prompts, and writes no session events, so no request field ever carries this package's data.

#### Token effect

Zero direct tokens on every request.

#### KV Cache effect

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

## Known Limitations and Deferred Work

- Session deletion and destructive folder removal are separate, absent capabilities; Workspace registration deletion never substitutes for either ([decision](../../../.agents/notes/implemented/feature/2026-07-27-workspace-registration-deletion.md)).
- The header index refreshes at startup and when attach must resolve an uncached persisted id; deletion or cwd damage performed by another process is observed after the next refresh or restart.
