L76 Core Arch

Demonstration skill showcasing complete AgentSkills core architecture. Includes SKILL.md structure, main entry logic, tool integration patterns, error handling, and production-ready patterns. Use as a template for building new skills.

L76 Core Architecture Skill

This skill demonstrates a complete, production-ready AgentSkills architecture.

When to Use

✅ USE this skill when:

• Building a new skill from scratch
• Reviewing or auditing existing skill structure
• Learning AgentSkills best practices
• Needing a template for tool integration

Architecture Overview

text

l76-core-arch/
├── SKILL.md           # Skill manifest + instructions (YOU ARE HERE)
├── index.js           # Main entry point (optional for simple skills)
├── references/        # Supporting docs, examples, templates
│   └── examples.md
└── scripts/           # Helper scripts (optional)
    └── validate.sh

Core Components

1. Frontmatter (Required)

yaml

---
name: skill-name              # kebab-case, unique identifier
description: |                # Clear trigger conditions
  When to use this skill.
metadata:
  author: your-name
  version: "1.0.0"
  emoji: "🎯"                 # Optional visual identifier
  openclaw:                   # OpenClaw-specific metadata
    requires:
      bins: ["tool1", "tool2"]
    install:                  # Installation instructions
      - id: tool1
        kind: node
        package: package-name
        bins: ["binary-name"]
        label: "Install description"
---

2. Skill Instructions Structure

markdown

# Skill Name

Brief description (1-2 sentences).

## When to Use

✅ **USE this skill when:**
- Clear trigger condition 1
- Clear trigger condition 2

❌ **DON'T use this skill when:**
- Anti-pattern 1
- Anti-pattern 2

## Workflow

### Step 1 — Preflight

Check prerequisites before starting.

### Step 2 — Main Logic

Core skill functionality.

### Step 3 — Cleanup

Finalize and report results.

## Error Handling

Common errors and recovery steps.

## Examples

Concrete usage examples.

Tool Integration Patterns

Pattern 1: Sequential Tool Calls

javascript

// Read file, then process, then write
const content = await read({ path: "input.txt" });
const processed = transform(content);
await write({ path: "output.txt", content: processed });

Pattern 2: Conditional Execution

javascript

// Check first, then act
const exists = await exec({ command: "test -f file.txt" });
if (exists.exitCode === 0) {
  await edit({ path: "file.txt", oldText: "...", newText: "..." });
}

Pattern 3: Error Recovery

javascript

try {
  await riskyOperation();
} catch (error) {
  // Log error
  await write({ path: "error.log", content: error.message });
  // Attempt recovery
  await recoveryStep();
  // Report to user
  return { status: "recovered", error: error.message };
}

Pattern 4: Batch Operations

javascript

// Process multiple items efficiently
const items = await discoverItems();
const results = await Promise.all(
  items.map(item => processItem(item))
);

Error Handling Strategy

Error Categories

1. Recoverable — Retry with backoff, fallback to alternative
2. User Action Required — Prompt user for input/permission
3. Fatal — Report clearly, suggest workaround

Error Response Format

javascript

{
  status: "error" | "partial" | "success",
  error: "Human-readable error message",
  recovery: "Suggested next step",
  details: { /* Technical details */ }
}

Memory Items

Skills should track state when needed:

markdown

### Skill State

- Last run: 2026-03-22
- Items processed: 42
- Errors encountered: 3
- Configuration: {...}

Testing Checklist

• Skill triggers correctly
• All tool calls succeed
• Error paths tested
• Output is clear and actionable
• No sensitive data leaked
• Idempotent (safe to re-run)

Publishing to ClawHub

bash

# Login first
clawhub login

# Publish
clawhub publish ./l76-core-arch \
  --slug l76-core-arch \
  --name "L76 Core Architecture" \
  --version 1.0.0 \
  --changelog "Initial release"

# Verify
clawhub list

References

• AgentSkills Spec
• ClawHub Documentation
• OpenClaw Skills