thilak0105/skill-creator

Skill Creator

This skill provides guidance for creating effective skills.

About Skills

Skills are modular, self-contained packages that extend AI capabilities by providing specialized knowledge, workflows, and tools. Think of them as "onboarding guides" for specific domains or tasks—they transform a general-purpose agent into a specialized agent equipped with procedural knowledge.

What Skills Provide

1. Specialized workflows - Multi-step procedures for specific domains
2. Tool integrations - Instructions for working with specific file formats or APIs
3. Domain expertise - Company-specific knowledge, schemas, business logic
4. Bundled resources - Scripts, references, and assets for complex and repetitive tasks

Core Principles

Concise is Key

The context window is a public good. Skills share the context window with everything else needed: system prompt, conversation history, other Skills' metadata, and the actual user request.

Default assumption: The AI is already very smart. Only add context it doesn't already have. Challenge each piece of information: "Is this explanation really needed?" and "Does this paragraph justify its token cost?"

Prefer concise examples over verbose explanations.

Set Appropriate Degrees of Freedom

Match the level of specificity to the task's fragility and variability:

High freedom (text-based instructions): Use when multiple approaches are valid, decisions depend on context, or heuristics guide the approach.

Medium freedom (pseudocode or scripts with parameters): Use when a preferred pattern exists, some variation is acceptable, or configuration affects behavior.

Low freedom (specific scripts, few parameters): Use when operations are fragile and error-prone, consistency is critical, or a specific sequence must be followed.

Anatomy of a Skill

Every skill consists of a required SKILL.md file and optional bundled resources:

skill-name/
├── SKILL.md (required)
│   ├── YAML frontmatter metadata (required)
│   │   ├── name: (required)
│   │   ├── description: (required)
│   │   └── command: (optional, e.g., /my-skill)
│   └── Markdown instructions (required)
└── Bundled Resources (optional)
    ├── scripts/          - Executable code (Python/Bash/etc.)
    ├── references/       - Documentation loaded as needed
    └── assets/           - Files used in output (templates, icons, fonts, etc.)

SKILL.md (required)

Every SKILL.md consists of:

• Frontmatter (YAML): Contains name, description, and optional command fields. These determine when the skill gets used—be clear and comprehensive.
• Body (Markdown): Instructions and guidance for using the skill. Only loaded AFTER the skill triggers.

Bundled Resources (optional)

Scripts (scripts/)

Executable code for tasks requiring deterministic reliability or that are repeatedly rewritten.

• When to include: When the same code is being rewritten repeatedly or deterministic reliability is needed
• Example: scripts/rotate_pdf.py for PDF rotation tasks

References (references/)

Documentation and reference material loaded as needed into context.

• When to include: For documentation that should be referenced while working
• Examples: references/schema.md for database schemas, references/api_docs.md for API specifications

Assets (assets/)

Files not intended to be loaded into context, but used within the output.

• When to include: When the skill needs files for the final output
• Examples: assets/logo.png for brand assets, assets/template.html for boilerplate

Skill Creation Process

1. Understand the skill - Gather concrete examples of how the skill will be used
2. Plan contents - Identify what scripts, references, and assets would be helpful
3. Create the skill directory - Set up the folder structure
4. Write SKILL.md - Include frontmatter and instructions
5. Verify creation - MANDATORY: Confirm file exists at correct path with valid content
6. Test and iterate - Use the skill on real tasks and improve

Step 1: Understanding the Skill

To create an effective skill, understand concrete examples of how it will be used:

• "What functionality should this skill support?"
• "Can you give examples of how this skill would be used?"
• "What would a user say that should trigger this skill?"

Step 2: Planning Contents

Analyze each example to identify reusable resources:

1. Consider how to execute the example from scratch
2. Identify what scripts, references, and assets would help

Step 3: Create the Skill

Create a new directory for your skill:

my-skill/
├── SKILL.md
└── (optional resources)

Step 4: Write SKILL.md

Frontmatter:

---
name: my-skill
description: Clear description of what the skill does and when to use it.
command: /my-skill
---

Body:

Write clear instructions for using the skill. Include:

• Overview of the skill's purpose
• Step-by-step workflows
• Examples when helpful
• References to any bundled resources

Step 5: Test and Iterate

After creating the skill:

1. Use it on real tasks
2. Notice struggles or inefficiencies
3. Update SKILL.md or bundled resources
4. Test again

Saving Skills in Navigator

IMPORTANT: When creating skills in Navigator, you can ONLY create "custom" skills. You CANNOT create "official" skills - those are bundled with the app and managed by the Navigator team.

User Skills Directory

CRITICAL: You MUST save skills to EXACTLY the canonical path provided in the task prompt. Do NOT ask the user where to save - the path is fixed by the app.

If the task prompt includes an explicit skills base directory or exact SKILL.md path, that value is the source of truth and must be used exactly.

Skills must be saved to the Navigator user data directory under a skills folder:

macOS: ~/Library/Application Support/Navigator/skills/<skill-name>/SKILL.md Windows: %APPDATA%\Navigator\skills\<skill-name>\SKILL.md Linux: ~/.config/Navigator/skills/<skill-name>/SKILL.md

NEVER:

• Ask the user where to save the skill file
• Use any other path like ~/skills/, ./skills/, or custom paths
• Offer the user choices about the save location

The path is determined by the application runtime. Use the explicit runtime path from the prompt when provided. Only fall back to OS-based detection when no runtime path is provided.

How to Save a Skill

Do not ask the user for a path. Follow these steps automatically:

1. Use the base path from the task prompt when present.

   • If no path is provided, detect the OS and use:
     • macOS: ~/Library/Application Support/Navigator/skills/
     • Windows: %APPDATA%\Navigator\skills\
     • Linux: ~/.config/Navigator/skills/

2. Create the skill directory named after your skill (lowercase, hyphenated), or use the exact directory name provided in the task prompt:

   <base-path>/my-awesome-skill/
   

3. Write the SKILL.md file inside that directory:

   <base-path>/my-awesome-skill/SKILL.md
   

4. Add any bundled resources as subdirectories if needed:

   <base-path>/my-awesome-skill/
   ├── SKILL.md
   ├── scripts/
   ├── references/
   └── assets/
   

5. The skill is automatically detected - Navigator scans this directory on startup and syncs new skills to its database. The skill will appear in Settings > Skills as a "Custom" skill.

Skill Frontmatter Rules

For custom skills in Navigator:

• name: Required - the skill's display name
• description: Required - when to use this skill
• command: Optional - slash command like /my-skill
• DO NOT use verified: true - only official skills can be verified
• DO NOT use hidden: true - only internal skills should be hidden

Example Custom Skill

---
name: my-awesome-skill
description: Does something awesome. Use when users want to do awesome things.
command: /awesome
---

After Creating - MANDATORY VERIFICATION

IMPORTANT: You MUST verify the skill was created correctly before telling the user it's complete.

Verification Steps (Required)

1. Read the file - Use the Read tool to read the SKILL.md file you just created. This confirms:

   • The file actually exists
   • The content was written correctly

2. Verify the path - Confirm the file path matches the explicit path from the task prompt.

   • If no explicit path was provided, verify against:
     • macOS: ~/Library/Application Support/Navigator/skills/<skill-name>/SKILL.md
     • Windows: %APPDATA%\Navigator\skills\<skill-name>\SKILL.md
     • Linux: ~/.config/Navigator/skills/<skill-name>/SKILL.md

3. Validate frontmatter - Confirm the YAML frontmatter contains:

   • name: Present and non-empty
   • description: Present and non-empty
   • No forbidden fields (verified: true or hidden: true)

4. Report results - Only after ALL checks pass, tell the user:

   • The skill has been saved to their skills directory
   • Show the exact path where it was saved
   • Click the refresh button (↻) in Settings > Skills or in the + menu to detect the new skill
   • They can enable/disable or delete custom skills from the Settings panel

If verification fails: Do NOT tell the user the skill was created. Instead, diagnose the issue and fix it before re-verifying.

Example: Creating a Simple Skill

Here's a minimal skill example:

---
name: greeting-generator
description: Generate personalized greetings for various occasions. Use when users want help writing greeting cards, welcome messages, or celebratory notes.
command: /greet
---

# Greeting Generator

Generate warm, personalized greetings for any occasion.

## Usage

1. Ask what type of greeting is needed (birthday, holiday, thank you, etc.)
2. Gather details about the recipient
3. Generate multiple greeting options
4. Refine based on feedback

## Tone Guidelines

- **Formal**: Professional settings, business relationships
- **Warm**: Friends and family
- **Playful**: Children, casual occasions

## Examples

**Birthday greeting:**
"Wishing you a day filled with joy and a year filled with success!"

**Thank you note:**
"Your thoughtfulness means more than words can express. Thank you!"