# @deepseek-ai/dsh-permission

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User-facing permission presets through `ctx.permission` ([`PermissionService`](src/index.ts)). Each configured name bundles `sandbox/mode` with `approval/policy`; the defaults are `workspace-write` (`workspace-write` + `ask`) and `danger-full-access` (`danger-full-access` + `never`). UI adapters may expose the table as one selector, while sandbox execution and approval continue to consume their own knobs.

`set(session, name)` records a changed selection in a log-only `permission/preset` event, then calls each knob's setter only when its effective value changes. The selection event precedes the knob events and preserves user intent when presets share a bundle; a net-zero selection appends nothing. `current(events)` prefers a still-matching recorded selection, then the first matching table entry, and otherwise returns `custom`. Clients may display `custom` as the current value, but cannot select it.

The service requires a confining `ctx.bash` executor and `ctx.approval`. A table entry named `custom` throws at load; composition defaults outside the table instead make a zero-event session derive `custom`. See the [sandbox switching design](../../../.agents/notes/implemented/feature/2026-07-06-sandbox.md).

## Model Experience

Indirectly, through `dsh-user-approval` and `dsh-tool-bash`, which render the approval-policy prompt, switch notice, and sandboxed tool outcomes selected by this service's knob events; `permission/preset` itself is log-only.

#### KV Cache effect

No direct invalidation; the named consumer owns any request-prefix changes.

## Known Limitations and Deferred Work

- **No shipped composition currently mounts the service** — the ACP bridge was its only selector before [ACP became automation-only](../../../.agents/notes/implemented/simplification/2026-07-23-acp-automation-only-protocol.md); the preset table is kept for the interactive front door that next exposes a runtime policy switch.
- **Only two mechanism knobs are bundled** — presets select sandbox mode and approval policy; an agent/profile choice is not part of `PresetSpec` yet.
- **`custom` is derived-only** — callers can switch away from an unmatched knob combination but cannot target or persist a named custom preset through this service.
- **The preset table is process-level** — configuration is fixed for the plugin lifetime; changing available presets requires reloading the plugin.
