# Copilot Ld Copilot Ld Libpolicy

> libpolicy Skill

- Skill: `tomevault-io/copilot-ld-copilot-ld-libpolicy` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/copilot-ld-copilot-ld-libpolicy`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/copilot-ld-copilot-ld-libpolicy/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/copilot-ld-copilot-ld-libpolicy

---


# libpolicy Skill

## When to Use

- Implementing access control for resources
- Evaluating authorization policies
- Managing permissions in multi-tenant systems
- Building role-based access control (RBAC)

## Key Concepts

**PolicyIndex**: Stores policies and evaluates access requests against them.

**Policy evaluation**: Determines if an actor can perform an action on a
resource based on defined policies.

## Usage Patterns

### Pattern 1: Evaluate access

```javascript
import { createPolicyIndex } from "@copilot-ld/libpolicy";

const index = await createPolicyIndex(storage);
const allowed = await index.evaluate({
  actor: "user:123",
  resource: "document:456",
  action: "read",
});
```

### Pattern 2: Load policies

```javascript
const index = await createPolicyIndex(storage);
await index.load("policies/"); // Load from directory
```

## Integration

Used by ResourceIndex for access control. Policies stored in data/policies/.

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<!-- tomevault:4.0:skill_md:2026-04-13 -->