# Engine

> Rule engine reference — decision tables, Rete algorithm, forward/backward chaining, and business rule management. Use when evaluating business rules, building decision trees, or implementing policy engines.

- Skill: `bytesagain/engine` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add bytesagain/engine`
- Raw SKILL.md: https://api.skillmd.com/api/skills/bytesagain/engine/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: bytesagain (https://skillmd.com/u/bytesagain)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/bytesagain/engine

---


# Engine — Rule Engine & Decision Logic Reference

Quick-reference skill for rule engines, decision tables, and business rule patterns.

## When to Use

- Implementing business rules that change frequently
- Building decision trees or scoring systems
- Choosing between rule engine approaches
- Designing policy engines for access control or pricing
- Separating business logic from application code

## Commands

### `intro`

```bash
scripts/script.sh intro
```

Overview of rule engines — types, benefits, when to use.

### `patterns`

```bash
scripts/script.sh patterns
```

Rule engine patterns — forward chaining, backward chaining, Rete.

### `tables`

```bash
scripts/script.sh tables
```

Decision tables — structure, completeness, and implementation.

### `dsl`

```bash
scripts/script.sh dsl
```

Domain-specific languages for rules — syntax approaches and examples.

### `tools`

```bash
scripts/script.sh tools
```

Rule engine tools — Drools, OPA, json-rules-engine, and more.

### `scoring`

```bash
scripts/script.sh scoring
```

Scoring and ranking engines — weighted rules, multi-criteria decisions.

### `testing`

```bash
scripts/script.sh testing
```

Testing rule engines — coverage, conflict detection, regression.

### `checklist`

```bash
scripts/script.sh checklist
```

Rule engine implementation checklist.

### `help`

```bash
scripts/script.sh help
```

### `version`

```bash
scripts/script.sh version
```

## Configuration

| Variable | Description |
|----------|-------------|
| `ENGINE_DIR` | Data directory (default: ~/.engine/) |

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