# Settings Modal — Design

**Date:** 2026-04-21
**Status:** Approved for planning

## Goal

Add a general-settings modal reachable from the **⋯** button in the user footer of the Lists island (`ListsIslandView.axaml:68`). The modal exposes app-wide defaults for Claude runs, worktree behavior, and maintenance actions (cleanup / force-remove worktrees), plus a read-only "About" section with paths.

## Scope

**In scope**

- Claude defaults: instructions, model, max turns, permission mode
- Worktree defaults: strategy, central root, auto-cleanup toggle + days
- Worktree maintenance actions: cleanup finished, force-remove all
- About section: version, data/logs/config paths with "Open in Explorer"
- Single settings row persisted in SQLite
- SignalR surface for read/update + maintenance
- `ClaudeArgsBuilder` merge behavior for per-task overrides

**Out of scope**

- Worker-side infrastructure settings (hub URL, auto-start worker) — stays in `worker.config.json`
- Per-task "inherit defaults" toggle (always inherit; task values override per rule below)
- Any UI-layer tests (project has none today)

## Architecture

### Persistence

New single-row entity `AppSettingsEntity` (Id = 1) in SQLite. Access via new `AppSettingsRepository` with `GetAsync` / `UpdateAsync`. Seeded by a new EF migration `AddAppSettings`.

Fields:

| Column | Type | Seed default |
|---|---|---|
| `DefaultClaudeInstructions` | text | `""` |
| `DefaultModel` | string | `sonnet` |
| `DefaultMaxTurns` | int | `100` |
| `DefaultPermissionMode` | string | `acceptEdits` |
| `WorktreeStrategy` | string | `sibling` |
| `CentralWorktreeRoot` | string? | `null` |
| `WorktreeAutoCleanupEnabled` | bool | `false` |
| `WorktreeAutoCleanupDays` | int | `7` |

Rationale for DB over `worker.config.json`: transactional writes from the UI, no file-watcher dance, and the Worker already uses `IDbContextFactory<ClaudeDoDbContext>`.

### Merge rules for per-task overrides

`ClaudeArgsBuilder` gains a dependency on `AppSettingsRepository` and merges at build time:

- **Instructions:** `global + "\n\n" + task` (skip separator if either side empty)
- **Model / MaxTurns / PermissionMode:** `task ?? global` (task value wins when set)

No `TaskEntity` schema change.

### SignalR surface (new hub methods)

| Method | Returns | Notes |
|---|---|---|
| `GetAppSettings()` | `AppSettingsDto` | Single row |
| `UpdateAppSettings(dto)` | void | Full-row replace |
| `CleanupFinishedWorktrees()` | `int removedCount` | Skips Active |
| `ResetAllWorktrees()` | `{ removed, tasksAffected }` | Fails if any task is Running |

Maintenance logic lives in a new `WorktreeMaintenanceService` in the Worker; the hub stays thin. Service uses existing `GitService` + `WorktreeRepository`.

**Running-task guard:** `ResetAllWorktrees()` checks for any `Running` tasks before touching anything. If present, returns an error — the modal surfaces *"Cannot force-remove: N task(s) still running. Cancel them first."*

Affected worktrees after force-remove are marked `Discarded` in `WorktreeRepository`.

## UI

### Entry point

`ListsIslandView.axaml:68` ⋯ button binds to a new `OpenSettingsCommand` on `IslandsShellViewModel`. Command resolves `SettingsModalViewModel` and shows `SettingsModalView` via the existing modal pattern (`TaskCompletionSource<bool>` on save/cancel — same as `WorktreeModalView` / `DiffModalView`).

### Layout

Single scrollable modal, ~560 px wide, matches existing modal chrome (header eyebrow, monospace labels, close affordance). No tabs.

**Sections (top to bottom):**

1. **CLAUDE DEFAULTS** — instructions textarea (6 lines), model picker, max-turns numeric, permission-mode picker
2. **WORKTREES** — strategy picker, central-root folder picker, auto-cleanup toggle + days, then the two maintenance buttons
3. **ABOUT** — version (read-only), data folder / logs folder / worker.config path, each with "Open in Explorer" icon button

Footer: `[ Cancel ]` `[ Save ]`, right-aligned. Save button disabled while the form is invalid.

### Destructive action UX

- **Cleanup finished** — single click, inline result line under the button (`"Removed 3 worktree(s)."`), auto-clears ~4 s
- **Force-remove all** — click reveals an inline confirm row: *"Remove ALL N worktrees? Uncommitted work will be lost."* with red `Remove All` and neutral `Cancel`. Two-click confirm, no typed string (matches the delete-task confirm already in the app)

Both run against the worker over SignalR and leave the modal open on completion.

### Open-in-Explorer

Uses `Process.Start("explorer.exe", path)`. Windows-only is acceptable (app ships Windows-only via WPF installer).

### Validation

Modal-side only, block `Save`:

- Max turns: integer 1–200
- Auto-cleanup days: integer 1–365 (required only when toggle is on)
- Central root: required when Strategy = Central; must be an existing directory
- Instructions: no length cap

Invalid fields get a red eyebrow with the specific error text.

## Testing (ClaudeDo.Worker.Tests)

- **`AppSettingsRepositoryTests`** — round-trip `Get` / `Update` on real SQLite
- **`ClaudeArgsBuilderTests`** — four merge cases: both empty, only global, only task, both set (prepend + separator behavior)
- **`WorktreeMaintenanceServiceTests`** — real git worktree fixtures:
  - cleanup skips `Active`, removes `Merged` / `Discarded` / `Kept`
  - force-remove fails while any task is `Running`
  - force-remove succeeds otherwise and flips affected worktrees to `Discarded`

No UI-layer tests (project has none today).

## Build order (high level)

1. Data: entity + configuration + migration + repository
2. Worker: `WorktreeMaintenanceService` + `ClaudeArgsBuilder` wiring + hub methods + DTO
3. UI: SignalR client methods on `WorkerClient`, `SettingsModalViewModel`, `SettingsModalView`
4. Wire ⋯ button on `ListsIslandView` → `IslandsShellViewModel.OpenSettingsCommand`
5. Tests (Worker.Tests)

Detailed step-by-step sequencing belongs in the implementation plan, not here.
