understand-explain

Included with Lifetime

$97 forever

Use when you need a deep-dive explanation of a specific file, function, or module in the codebase

General

What this skill does

# /understand-explain

Provide a thorough, in-depth explanation of a specific code component.

## Graph Structure Reference

The knowledge graph JSON has this structure:
- `project` — {name, description, languages, frameworks, analyzedAt, gitCommitHash}
- `nodes[]` — each has {id, type, name, filePath?, summary, tags[], complexity, languageNotes?}
- Code node types: file, function, class, module, concept
- Non-code node types: config, document, service, table, endpoint, pipeline, schema, resource
- Domain/knowledge node types: domain, flow, step, article, entity, topic, claim, source
- IDs use the node type as prefix, e.g. `file:path`, `function:path:name`, `config:path`, `article:path`
- `edges[]` — each has {source, target, type, direction, weight}
- Key types: imports, contains, calls, depends_on, configures, documents, deploys, triggers, contains_flow, flow_step, related, cites
- `layers[]` — each has {id, name, description, nodeIds[]}
- `tour[]` — each has {order, title, description, nodeIds[]}

## How to Read Efficiently

1. Use Grep to search within the JSON for relevant entries BEFORE reading the full file
2. Only read sections you need — don't dump the entire graph into context
3. Node names and summaries are the most useful fields for understanding
4. Edges tell you how components connect — follow imports and calls for dependency chains

## Instructions

1. Check that `.understand-anything/knowledge-graph.json` exists. If not, tell the user to run `/understand` first.

2. **Find the target node** — use Grep to search the knowledge graph for the component: "$ARGUMENTS"
- For file paths (e.g., `src/auth/login.ts`): search for `"filePath"` matches
- For function notation (e.g., `src/auth/login.ts:verifyToken`): search for the function name in `"name"` fields filtered by the file path
- Note the exact node `id`, `type`, `summary`, `tags`, and `complexity`

3. **Find all connected edges** — Grep for the target node's ID in the edges section:
- `"source"` matches → things this node calls/imports/depends on (outgoing)
- `"target"` matches → things that call/import/depend on this node (incoming)
- Note the connected node IDs and edge types

4. **Read connected nodes** — for each connected node ID from step 3, Grep for those IDs in the nodes section to get their `name`, `summary`, and `type`. This builds the component's neighborhood.

5. **Identify the layer** — Grep for the target node's ID in the `"layers"` section to find which architectural layer it belongs to and that layer's description.

6. **Read the actual source file** — Read the source file at the node's `filePath` for the deep-dive analysis.

7. **Explain the component in context**:
- Its role in the architecture (which layer, why it exists)
- Internal structure (functions, classes it contains — from `contains` edges)
- External connections (what it imports, what calls it, what it depends on — from edges)
- Data flow (inputs → processing → outputs — from source code)
- Explain clearly, assuming the reader may not know the programming language
- Highlight any patterns, idioms, or complexity worth understanding

Files: 1

Size: 3.3 KB

Complexity: 11/100

Category: General

Source: https://github.com/lum1104/understand-anything/tree/main/understand-anything-plugin/skills/understand-explain

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