# P8-009: TUI Phase 1 — Slash Command Parsing

## Task Reference

- Issue: #162
- Branch: feat/p8-009-tui-slash-commands

## Scope

- New files: parse.ts, registry.ts, local/help.ts, local/status.ts, commands/index.ts
- Modified files: use-socket.ts, input-bar.tsx, message-list.tsx, app.tsx

## Key Observations

- CommandDef in @mosaicstack/types does NOT have `category` field — will omit from LOCAL_COMMANDS
- CommandDef.args is `CommandArgDef[] | undefined`, not `{ usage: string }` — help.ts args rendering needs adjustment
- Message role union currently: 'user' | 'assistant' | 'thinking' | 'tool' — adding 'system'
- InputBar currently takes `onSubmit: (value: string) => void` — need to add slash command interception
- app.tsx passes `onSubmit={socket.sendMessage}` directly — needs command-aware handler

## Assumptions

- ASSUMPTION: `category` field not in CommandDef type — will skip category grouping in help output, or add it only to registry (not to CommandDef type)
- ASSUMPTION: For the `args` field display in help, will use `CommandArgDef.name` and `CommandArgDef.description`
- ASSUMPTION: `commands:manifest` event type may not be in ServerToClientEvents — will handle via socket.on with casting if needed

## Status

- [ ] Create commands directory structure
- [ ] Implement parse.ts
- [ ] Implement registry.ts
- [ ] Implement local/help.ts
- [ ] Implement local/status.ts
- [ ] Implement commands/index.ts
- [ ] Modify use-socket.ts
- [ ] Modify input-bar.tsx
- [ ] Modify message-list.tsx
- [ ] Modify app.tsx
- [ ] Run quality gates
- [ ] Commit + Push + PR + CI