slopus /control-flow — Analyze and design control flows and data structures
Read the relevant source code and produce ASCII tree diagrams inside ```txt blocks.
Format
- Each user action or IO event is a separate tree root
- Real function names and types — never invent
- Payload shapes as TypeScript types, not prose
- State mutations: which fields change, what triggers
- Re-render chain: which components and why
- Cross-package when the flow spans app → CLI → server
- Compact — skip trivial pass-throughs, show decisions
Example:
User taps "Archive"
│
├─ handleActionPress(action: SessionActionItem)
│ └─ onClose() → setActionsAnchor(null)
│
├─ sessionKill(sessionId: string)
│ ├─ POST /api/sessions/:id/kill
│ └─ → { success: boolean, message?: string }
│
└─ deleteSession(sessionId)
├─ mutates: sessions, sessionMessages, gitStatus, fileCache
├─ rebuilds: sessionListViewData
└─ re-renders: SessionsListWrapper (data ref changed)
For data structures, show the shape and what depends on it:
SessionRowData (flat primitives, cheap deep-equal)
├─ id, name, subtitle, avatarId ← identity + display
├─ state: SessionState ← collapsed from presence + agentState + thinking
├─ hasDraft: boolean ← collapsed from draft string
├─ activeAt?: number ← only inactive sessions (avoids heartbeat diffs)
├─ machineId, path, homeDir ← grouping in ActiveSessionsGroup
└─ completedTodosCount, totalTodosCount
│
consumed by:
├─ SessionItem → renders purely from props, no store hooks
├─ ActiveSessionsGroup → groups by machineId + path
└─ useDeepEqual → 12 primitive comparisons vs full Session tree
Principles
- Expressive yet compact — every line earns its place
- Show payload SHAPE not description
- Show state mutations → which store fields, what rebuilds
- Show re-render chain → component + reason
- Pseudo code only for branching logic between nodes
- Always output inside ```txt for alignment
- File:line refs when helpful, not mandatory — the flow matters more than the location
Process
- Parse topic into entry points
- Grep/Explore to find the call chain
- Read each step at the relevant lines
- Build tree from trigger → final effect
- Output as ```txt blocks
Source: slopus/happy → .agents/skills/control-flow/SKILL.md