---
name: code-explorer
description: Search and explore codebases with CodeGraph. Symbol lookup, caller/callee analysis, impact analysis, BFS graph traversal.
metadata: { "openclaw": { "emoji": "🔍" } }
---

# Code Explorer — CodeGraph Knowledge Graph

Query codebases through a pre-indexed SQLite knowledge graph with FTS5 full-text search and BFS graph traversal.

## When to Use

- **"Where is X defined?"** → `search`
- **"Who calls X?"** → `callers`
- **"What does X call?"** → `callees`
- **"What's the impact of changing X?"** → `impact`
- **"How does the codebase handle auth?"** → `search` + `callers`
- **Before grep/glob** — CodeGraph is faster and more structured

## Setup

```bash
# Index a codebase (only needed once, or after major changes)
node src/codegraph/index.js index <project_dir>

# Force re-index
node src/codegraph/index.js index . --force

# Check index stats
node src/codegraph/index.js stats
```

## Commands

### Search symbols

```bash
node src/codegraph/index.js search "function_name"
node src/codegraph/index.js search "auth" --limit 10
```

### Caller/callee analysis

```bash
node src/codegraph/index.js callers "login"
node src/codegraph/index.js callees "main"
```

### Impact analysis (BFS traversal)

```bash
node src/codegraph/index.js impact "AuthService"
```

### Deep exploration (search + BFS context)

```bash
node src/codegraph/index.js explore "how to send HTTP requests"
```

## Languages Supported

JavaScript/TypeScript, Python, Rust, Go, Java, Ruby, Shell, C/C++

Extraction via regex grammars (8 languages, 8+ node types: function/class/method/struct/enum/import/export)

## Database

SQLite at `.codegraph/codegraph.db` with:
- `nodes` — symbols (name, kind, signature, location)
- `edges` — relationships (calls, imports, extends, implements)
- `files` — file metadata with hash-based incremental sync
- `nodes_fts` — FTS5 full-text search index

## Integration Pattern

```
Query codebase → codegraph search → symbol list → codegraph callers → call graph
                                                              ↓
                                                     codegraph impact → affected files
```

## File Path

- `src/codegraph/index.js` — main entry (index, search, callers, callees, impact, explore)
- `src/codegraph/schema.sql` — SQLite schema