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feat: rewrite skill creator skill in ts and bundle (#333)

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Co-authored-by: Letta <noreply@letta.com>
This commit is contained in:
Charles Packer
2025-12-21 17:25:23 -08:00
committed by GitHub
parent e410edb6d0
commit a6f27c7971
17 changed files with 1079 additions and 797 deletions
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1
.gitignore vendored
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@@ -10,6 +10,7 @@ bun.lockb
bin/
letta.js
letta.js.map
/skills/
.DS_Store
# Logs

202
.skills/skill-creator/LICENSE.txt
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@@ -1,202 +0,0 @@
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303
.skills/skill-creator/scripts/init_skill.py
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@@ -1,303 +0,0 @@
#!/usr/bin/env python3
"""
Skill Initializer - Creates a new skill from template
Usage:
init_skill.py <skill-name> --path <path>
Examples:
init_skill.py my-new-skill --path skills/public
init_skill.py my-api-helper --path skills/private
init_skill.py custom-skill --path /custom/location
"""
import sys
from pathlib import Path
SKILL_TEMPLATE = """---
name: {skill_name}
description: [TODO: Complete and informative explanation of what the skill does and when to use it. Include WHEN to use this skill - specific scenarios, file types, or tasks that trigger it.]
---
# {skill_title}
## Overview
[TODO: 1-2 sentences explaining what this skill enables]
## Structuring This Skill
[TODO: Choose the structure that best fits this skill's purpose. Common patterns:
**1. Workflow-Based** (best for sequential processes)
- Works well when there are clear step-by-step procedures
- Example: DOCX skill with "Workflow Decision Tree" → "Reading" → "Creating" → "Editing"
- Structure: ## Overview → ## Workflow Decision Tree → ## Step 1 → ## Step 2...
**2. Task-Based** (best for tool collections)
- Works well when the skill offers different operations/capabilities
- Example: PDF skill with "Quick Start" → "Merge PDFs" → "Split PDFs" → "Extract Text"
- Structure: ## Overview → ## Quick Start → ## Task Category 1 → ## Task Category 2...
**3. Reference/Guidelines** (best for standards or specifications)
- Works well for brand guidelines, coding standards, or requirements
- Example: Brand styling with "Brand Guidelines" → "Colors" → "Typography" → "Features"
- Structure: ## Overview → ## Guidelines → ## Specifications → ## Usage...
**4. Capabilities-Based** (best for integrated systems)
- Works well when the skill provides multiple interrelated features
- Example: Product Management with "Core Capabilities" → numbered capability list
- Structure: ## Overview → ## Core Capabilities → ### 1. Feature → ### 2. Feature...
Patterns can be mixed and matched as needed. Most skills combine patterns (e.g., start with task-based, add workflow for complex operations).
Delete this entire "Structuring This Skill" section when done - it's just guidance.]
## [TODO: Replace with the first main section based on chosen structure]
[TODO: Add content here. See examples in existing skills:
- Code samples for technical skills
- Decision trees for complex workflows
- Concrete examples with realistic user requests
- References to scripts/templates/references as needed]
## Resources
This skill includes example resource directories that demonstrate how to organize different types of bundled resources:
### scripts/
Executable code (Python/Bash/etc.) that can be run directly to perform specific operations.
**Examples from other skills:**
- PDF skill: `fill_fillable_fields.py`, `extract_form_field_info.py` - utilities for PDF manipulation
- DOCX skill: `document.py`, `utilities.py` - Python modules for document processing
**Appropriate for:** Python scripts, shell scripts, or any executable code that performs automation, data processing, or specific operations.
**Note:** Scripts may be executed without loading into context, but can still be read by the Letta Code agent for patching or environment adjustments.
### references/
Documentation and reference material intended to be loaded into context to inform the Letta Code agent's process and thinking.
**Examples from other skills:**
- Product management: `communication.md`, `context_building.md` - detailed workflow guides
- BigQuery: API reference documentation and query examples
- Finance: Schema documentation, company policies
**Appropriate for:** In-depth documentation, API references, database schemas, comprehensive guides, or any detailed information that the Letta Code agent should reference while working.
### assets/
Files not intended to be loaded into context, but rather used within the output the Letta Code agent produces.
**Examples from other skills:**
- Brand styling: PowerPoint template files (.pptx), logo files
- Frontend builder: HTML/React boilerplate project directories
- Typography: Font files (.ttf, .woff2)
**Appropriate for:** Templates, boilerplate code, document templates, images, icons, fonts, or any files meant to be copied or used in the final output.
---
**Any unneeded directories can be deleted.** Not every skill requires all three types of resources.
"""
EXAMPLE_SCRIPT = '''#!/usr/bin/env python3
"""
Example helper script for {skill_name}
This is a placeholder script that can be executed directly.
Replace with actual implementation or delete if not needed.
Example real scripts from other skills:
- pdf/scripts/fill_fillable_fields.py - Fills PDF form fields
- pdf/scripts/convert_pdf_to_images.py - Converts PDF pages to images
"""
def main():
print("This is an example script for {skill_name}")
# TODO: Add actual script logic here
# This could be data processing, file conversion, API calls, etc.
if __name__ == "__main__":
main()
'''
EXAMPLE_REFERENCE = """# Reference Documentation for {skill_title}
This is a placeholder for detailed reference documentation.
Replace with actual reference content or delete if not needed.
Example real reference docs from other skills:
- product-management/references/communication.md - Comprehensive guide for status updates
- product-management/references/context_building.md - Deep-dive on gathering context
- bigquery/references/ - API references and query examples
## When Reference Docs Are Useful
Reference docs are ideal for:
- Comprehensive API documentation
- Detailed workflow guides
- Complex multi-step processes
- Information too lengthy for main SKILL.md
- Content that's only needed for specific use cases
## Structure Suggestions
### API Reference Example
- Overview
- Authentication
- Endpoints with examples
- Error codes
- Rate limits
### Workflow Guide Example
- Prerequisites
- Step-by-step instructions
- Common patterns
- Troubleshooting
- Best practices
"""
EXAMPLE_ASSET = """# Example Asset File
This placeholder represents where asset files would be stored.
Replace with actual asset files (templates, images, fonts, etc.) or delete if not needed.
Asset files are NOT intended to be loaded into context, but rather used within
the output the Letta Code agent produces.
Example asset files from other skills:
- Brand guidelines: logo.png, slides_template.pptx
- Frontend builder: hello-world/ directory with HTML/React boilerplate
- Typography: custom-font.ttf, font-family.woff2
- Data: sample_data.csv, test_dataset.json
## Common Asset Types
- Templates: .pptx, .docx, boilerplate directories
- Images: .png, .jpg, .svg, .gif
- Fonts: .ttf, .otf, .woff, .woff2
- Boilerplate code: Project directories, starter files
- Icons: .ico, .svg
- Data files: .csv, .json, .xml, .yaml
Note: This is a text placeholder. Actual assets can be any file type.
"""
def title_case_skill_name(skill_name):
"""Convert hyphenated skill name to Title Case for display."""
return ' '.join(word.capitalize() for word in skill_name.split('-'))
def init_skill(skill_name, path):
"""
Initialize a new skill directory with template SKILL.md.
Args:
skill_name: Name of the skill
path: Path where the skill directory should be created
Returns:
Path to created skill directory, or None if error
"""
# Determine skill directory path
skill_dir = Path(path).resolve() / skill_name
# Check if directory already exists
if skill_dir.exists():
print(f"❌ Error: Skill directory already exists: {skill_dir}")
return None
# Create skill directory
try:
skill_dir.mkdir(parents=True, exist_ok=False)
print(f"✅ Created skill directory: {skill_dir}")
except Exception as e:
print(f"❌ Error creating directory: {e}")
return None
# Create SKILL.md from template
skill_title = title_case_skill_name(skill_name)
skill_content = SKILL_TEMPLATE.format(
skill_name=skill_name,
skill_title=skill_title
)
skill_md_path = skill_dir / 'SKILL.md'
try:
skill_md_path.write_text(skill_content)
print("✅ Created SKILL.md")
except Exception as e:
print(f"❌ Error creating SKILL.md: {e}")
return None
# Create resource directories with example files
try:
# Create scripts/ directory with example script
scripts_dir = skill_dir / 'scripts'
scripts_dir.mkdir(exist_ok=True)
example_script = scripts_dir / 'example.py'
example_script.write_text(EXAMPLE_SCRIPT.format(skill_name=skill_name))
example_script.chmod(0o755)
print("✅ Created scripts/example.py")
# Create references/ directory with example reference doc
references_dir = skill_dir / 'references'
references_dir.mkdir(exist_ok=True)
example_reference = references_dir / 'api_reference.md'
example_reference.write_text(EXAMPLE_REFERENCE.format(skill_title=skill_title))
print("✅ Created references/api_reference.md")
# Create assets/ directory with example asset placeholder
assets_dir = skill_dir / 'assets'
assets_dir.mkdir(exist_ok=True)
example_asset = assets_dir / 'example_asset.txt'
example_asset.write_text(EXAMPLE_ASSET)
print("✅ Created assets/example_asset.txt")
except Exception as e:
print(f"❌ Error creating resource directories: {e}")
return None
# Print next steps
print(f"\n✅ Skill '{skill_name}' initialized successfully at {skill_dir}")
print("\nNext steps:")
print("1. Edit SKILL.md to complete the TODO items and update the description")
print("2. Customize or delete the example files in scripts/, references/, and assets/")
print("3. Run the validator when ready to check the skill structure")
return skill_dir
def main():
if len(sys.argv) < 4 or sys.argv[2] != '--path':
print("Usage: init_skill.py <skill-name> --path <path>")
print("\nSkill name requirements:")
print(" - Hyphen-case identifier (e.g., 'data-analyzer')")
print(" - Lowercase letters, digits, and hyphens only")
print(" - Max 40 characters")
print(" - Must match directory name exactly")
print("\nExamples:")
print(" init_skill.py my-new-skill --path skills/public")
print(" init_skill.py my-api-helper --path skills/private")
print(" init_skill.py custom-skill --path /custom/location")
sys.exit(1)
skill_name = sys.argv[1]
path = sys.argv[3]
print(f"🚀 Initializing skill: {skill_name}")
print(f" Location: {path}")
print()
result = init_skill(skill_name, path)
if result:
sys.exit(0)
else:
sys.exit(1)
if __name__ == "__main__":
main()

110
.skills/skill-creator/scripts/package_skill.py
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@@ -1,110 +0,0 @@
#!/usr/bin/env python3
"""
Skill Packager - Creates a distributable .skill file of a skill folder
Usage:
python utils/package_skill.py <path/to/skill-folder> [output-directory]
Example:
python utils/package_skill.py skills/public/my-skill
python utils/package_skill.py skills/public/my-skill ./dist
"""
import sys
import zipfile
from pathlib import Path
from quick_validate import validate_skill
def package_skill(skill_path, output_dir=None):
"""
Package a skill folder into a .skill file.
Args:
skill_path: Path to the skill folder
output_dir: Optional output directory for the .skill file (defaults to current directory)
Returns:
Path to the created .skill file, or None if error
"""
skill_path = Path(skill_path).resolve()
# Validate skill folder exists
if not skill_path.exists():
print(f"❌ Error: Skill folder not found: {skill_path}")
return None
if not skill_path.is_dir():
print(f"❌ Error: Path is not a directory: {skill_path}")
return None
# Validate SKILL.md exists
skill_md = skill_path / "SKILL.md"
if not skill_md.exists():
print(f"❌ Error: SKILL.md not found in {skill_path}")
return None
# Run validation before packaging
print("🔍 Validating skill...")
valid, message = validate_skill(skill_path)
if not valid:
print(f"❌ Validation failed: {message}")
print(" Please fix the validation errors before packaging.")
return None
print(f"✅ {message}\n")
# Determine output location
skill_name = skill_path.name
if output_dir:
output_path = Path(output_dir).resolve()
output_path.mkdir(parents=True, exist_ok=True)
else:
output_path = Path.cwd()
skill_filename = output_path / f"{skill_name}.skill"
# Create the .skill file (zip format)
try:
with zipfile.ZipFile(skill_filename, 'w', zipfile.ZIP_DEFLATED) as zipf:
# Walk through the skill directory
for file_path in skill_path.rglob('*'):
if file_path.is_file():
# Calculate the relative path within the zip
arcname = file_path.relative_to(skill_path.parent)
zipf.write(file_path, arcname)
print(f" Added: {arcname}")
print(f"\n✅ Successfully packaged skill to: {skill_filename}")
return skill_filename
except Exception as e:
print(f"❌ Error creating .skill file: {e}")
return None
def main():
if len(sys.argv) < 2:
print("Usage: python utils/package_skill.py <path/to/skill-folder> [output-directory]")
print("\nExample:")
print(" python utils/package_skill.py skills/public/my-skill")
print(" python utils/package_skill.py skills/public/my-skill ./dist")
sys.exit(1)
skill_path = sys.argv[1]
output_dir = sys.argv[2] if len(sys.argv) > 2 else None
print(f"📦 Packaging skill: {skill_path}")
if output_dir:
print(f" Output directory: {output_dir}")
print()
result = package_skill(skill_path, output_dir)
if result:
sys.exit(0)
else:
sys.exit(1)
if __name__ == "__main__":
main()

95
.skills/skill-creator/scripts/quick_validate.py
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@@ -1,95 +0,0 @@
#!/usr/bin/env python3
"""
Quick validation script for skills - minimal version
"""
import sys
import os
import re
import yaml
from pathlib import Path
def validate_skill(skill_path):
"""Basic validation of a skill"""
skill_path = Path(skill_path)
# Check SKILL.md exists
skill_md = skill_path / 'SKILL.md'
if not skill_md.exists():
return False, "SKILL.md not found"
# Read and validate frontmatter
content = skill_md.read_text()
if not content.startswith('---'):
return False, "No YAML frontmatter found"
# Extract frontmatter
match = re.match(r'^---\n(.*?)\n---', content, re.DOTALL)
if not match:
return False, "Invalid frontmatter format"
frontmatter_text = match.group(1)
# Parse YAML frontmatter
try:
frontmatter = yaml.safe_load(frontmatter_text)
if not isinstance(frontmatter, dict):
return False, "Frontmatter must be a YAML dictionary"
except yaml.YAMLError as e:
return False, f"Invalid YAML in frontmatter: {e}"
# Define allowed properties
ALLOWED_PROPERTIES = {'name', 'description', 'license', 'allowed-tools', 'metadata'}
# Check for unexpected properties (excluding nested keys under metadata)
unexpected_keys = set(frontmatter.keys()) - ALLOWED_PROPERTIES
if unexpected_keys:
return False, (
f"Unexpected key(s) in SKILL.md frontmatter: {', '.join(sorted(unexpected_keys))}. "
f"Allowed properties are: {', '.join(sorted(ALLOWED_PROPERTIES))}"
)
# Check required fields
if 'name' not in frontmatter:
return False, "Missing 'name' in frontmatter"
if 'description' not in frontmatter:
return False, "Missing 'description' in frontmatter"
# Extract name for validation
name = frontmatter.get('name', '')
if not isinstance(name, str):
return False, f"Name must be a string, got {type(name).__name__}"
name = name.strip()
if name:
# Check naming convention (hyphen-case: lowercase with hyphens)
if not re.match(r'^[a-z0-9-]+$', name):
return False, f"Name '{name}' should be hyphen-case (lowercase letters, digits, and hyphens only)"
if name.startswith('-') or name.endswith('-') or '--' in name:
return False, f"Name '{name}' cannot start/end with hyphen or contain consecutive hyphens"
# Check name length (max 64 characters per spec)
if len(name) > 64:
return False, f"Name is too long ({len(name)} characters). Maximum is 64 characters."
# Extract and validate description
description = frontmatter.get('description', '')
if not isinstance(description, str):
return False, f"Description must be a string, got {type(description).__name__}"
description = description.strip()
if description:
# Check for angle brackets
if '<' in description or '>' in description:
return False, "Description cannot contain angle brackets (< or >)"
# Check description length (max 1024 characters per spec)
if len(description) > 1024:
return False, f"Description is too long ({len(description)} characters). Maximum is 1024 characters."
return True, "Skill is valid!"
if __name__ == "__main__":
if len(sys.argv) != 2:
print("Usage: python quick_validate.py <skill_directory>")
sys.exit(1)
valid, message = validate_skill(sys.argv[1])
print(message)
sys.exit(0 if valid else 1)

15
build.js
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@@ -5,7 +5,7 @@
* Bundles TypeScript source into a single JavaScript file
*/
import { readFileSync } from "node:fs";
import { cpSync, existsSync, readFileSync, rmSync } from "node:fs";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";
@@ -54,6 +54,19 @@ await Bun.write(outputPath, withShebang);
// Make executable
await Bun.$`chmod +x letta.js`;
// Copy bundled skills to skills/ directory for shipping
const bundledSkillsSrc = join(__dirname, "src/skills/builtin");
const bundledSkillsDst = join(__dirname, "skills");
if (existsSync(bundledSkillsSrc)) {
// Clean and copy
if (existsSync(bundledSkillsDst)) {
rmSync(bundledSkillsDst, { recursive: true });
}
cpSync(bundledSkillsSrc, bundledSkillsDst, { recursive: true });
console.log("📂 Copied bundled skills to skills/");
}
console.log("✅ Build complete!");
console.log(` Output: letta.js`);
console.log(

1
package.json
View File

@@ -11,6 +11,7 @@
"README.md",
"letta.js",
"scripts",
"skills",
"vendor"
],
"repository": {

89
src/agent/skills.ts
View File

@@ -9,17 +9,27 @@
import { existsSync } from "node:fs";
import { readdir, readFile } from "node:fs/promises";
import { join } from "node:path";
// Import bundled skills (embedded at build time)
import memoryInitSkillMd from "../skills/builtin/memory-init/SKILL.md";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";
import { parseFrontmatter } from "../utils/frontmatter";
/**
* Bundled skill sources - embedded at build time
* Get the bundled skills directory path
* This is where skills ship with the package (skills/ directory next to letta.js)
*/
const BUNDLED_SKILL_SOURCES: Array<{ id: string; content: string }> = [
{ id: "memory-init", content: memoryInitSkillMd },
];
function getBundledSkillsPath(): string {
// In dev mode (running from src/), look in src/skills/builtin/
// In production (running from letta.js), look in skills/ next to letta.js
const thisDir = dirname(fileURLToPath(import.meta.url));
// Check if we're in dev mode (thisDir contains 'src/agent')
if (thisDir.includes("src/agent") || thisDir.includes("src\\agent")) {
return join(thisDir, "../skills/builtin");
}
// Production mode - skills/ is next to the bundled letta.js
return join(thisDir, "skills");
}
/**
* Source of a skill (for display and override resolution)
@@ -90,65 +100,13 @@ const SKILLS_BLOCK_CHAR_LIMIT = 20000;
/**
* Parse a bundled skill from its embedded content
*/
function parseBundledSkill(id: string, content: string): Skill {
const { frontmatter, body } = parseFrontmatter(content);
const name =
(typeof frontmatter.name === "string" ? frontmatter.name : null) ||
id
.split("/")
.pop()
?.replace(/-/g, " ")
.replace(/\b\w/g, (l) => l.toUpperCase()) ||
id;
let description =
typeof frontmatter.description === "string"
? frontmatter.description
: null;
if (!description) {
const firstParagraph = body.trim().split("\n\n")[0];
description = firstParagraph || "No description available";
}
// Strip surrounding quotes
description = description.trim();
if (
(description.startsWith('"') && description.endsWith('"')) ||
(description.startsWith("'") && description.endsWith("'"))
) {
description = description.slice(1, -1);
}
let tags: string[] | undefined;
if (Array.isArray(frontmatter.tags)) {
tags = frontmatter.tags;
} else if (typeof frontmatter.tags === "string") {
tags = [frontmatter.tags];
}
return {
id,
name,
description,
category:
typeof frontmatter.category === "string"
? frontmatter.category
: undefined,
tags,
path: "", // Bundled skills don't have a file path
source: "bundled",
content, // Store the full content for bundled skills
};
}
/**
* Get bundled skills (embedded at build time)
* Get bundled skills by discovering from the bundled skills directory
*/
export function getBundledSkills(): Skill[] {
return BUNDLED_SKILL_SOURCES.map(({ id, content }) =>
parseBundledSkill(id, content),
);
export async function getBundledSkills(): Promise<Skill[]> {
const bundledPath = getBundledSkillsPath();
const result = await discoverSkillsFromDir(bundledPath, "bundled");
return result.skills;
}
/**
@@ -202,7 +160,8 @@ export async function discoverSkills(
const skillsById = new Map<string, Skill>();
// 1. Start with bundled skills (lowest priority)
for (const skill of getBundledSkills()) {
const bundledSkills = await getBundledSkills();
for (const skill of bundledSkills) {
skillsById.set(skill.id, skill);
}

21
.skills/skill-creator/SKILL.md → src/skills/builtin/skill-creator/SKILL.md
View File

@@ -1,7 +1,6 @@
---
name: skill-creator
description: Guide for creating effective skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Letta Code's capabilities with specialized knowledge, workflows, or tool integrations.
license: Complete terms in LICENSE.txt
---
# Skill Creator
@@ -56,7 +55,7 @@ skill-name/
│ │ └── description: (required)
│ └── Markdown instructions (required)
└── Bundled Resources (optional)
├── scripts/ - Executable code (Python/Bash/etc.)
├── scripts/ - Executable code (TypeScript/Python/Bash/etc.)
├── references/ - Documentation intended to be loaded into context as needed
└── assets/ - Files used in output (templates, icons, fonts, etc.)
```
@@ -72,10 +71,10 @@ Every SKILL.md in Letta Code consists of:
##### Scripts (`scripts/`)
Executable code (Python/Bash/etc.) for tasks that require deterministic reliability or are repeatedly rewritten.
Executable code (TypeScript/Python/Bash/etc.) for tasks that require deterministic reliability or 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
- **Example**: `scripts/rotate-pdf.ts` for PDF rotation tasks
- **Benefits**: Token efficient, deterministic, may be executed without loading into context
- **Note**: Scripts may still need to be read by the Letta Code agent for patching or environment-specific adjustments
@@ -205,9 +204,9 @@ Skill creation involves these steps:
1. Understand the skill with concrete examples
2. Plan reusable skill contents (scripts, references, assets)
3. Initialize the skill (run init_skill.py)
3. Initialize the skill (run init-skill.ts)
4. Edit the skill (implement resources and write SKILL.md)
5. Package the skill (run package_skill.py)
5. Package the skill (run package-skill.ts)
6. Iterate based on real usage
Follow these steps in order, skipping only if there is a clear reason why they are not applicable.
@@ -239,7 +238,7 @@ To turn concrete examples into an effective skill, analyze each example by:
Example: When building a `pdf-editor` skill to handle queries like "Help me rotate this PDF," the analysis shows:
1. Rotating a PDF requires re-writing the same code each time
2. A `scripts/rotate_pdf.py` script would be helpful to store in the skill
2. A `scripts/rotate-pdf.ts` script would be helpful to store in the skill
Example: When designing a `frontend-webapp-builder` skill for queries like "Build me a todo app" or "Build me a dashboard to track my steps," the analysis shows:
@@ -259,12 +258,12 @@ At this point, it is time to actually create the skill.
Skip this step only if the skill being developed already exists, and iteration or packaging is needed. In this case, continue to the next step.
When creating a new skill from scratch, always run the `init_skill.py` script. The script conveniently generates a new template skill directory that automatically includes everything a skill requires, making the skill creation process much more efficient and reliable.
When creating a new skill from scratch, always run the `init-skill.ts` script. The script conveniently generates a new template skill directory that automatically includes everything a skill requires, making the skill creation process much more efficient and reliable.
Usage:
```bash
scripts/init_skill.py <skill-name> --path <output-directory>
npx ts-node scripts/init-skill.ts <skill-name> --path <output-directory>
```
The script:
@@ -322,13 +321,13 @@ Write instructions for using the skill and its bundled resources.
Once development of the skill is complete, it must be packaged into a distributable .skill file that gets shared with the user. The packaging process automatically validates the skill first to ensure it meets all requirements:
```bash
scripts/package_skill.py <path/to/skill-folder>
npx ts-node scripts/package-skill.ts <path/to/skill-folder>
```
Optional output directory specification:
```bash
scripts/package_skill.py <path/to/skill-folder> ./dist
npx ts-node scripts/package-skill.ts <path/to/skill-folder> ./dist
```
The packaging script will:

0
.skills/skill-creator/references/output-patterns.md → src/skills/builtin/skill-creator/references/output-patterns.md
View File

8
.skills/skill-creator/references/workflows.md → src/skills/builtin/skill-creator/references/workflows.md
View File

@@ -7,11 +7,11 @@ For complex tasks, break operations into clear, sequential steps. It is often he
```markdown
Filling a PDF form involves these steps:
1. Analyze the form (run analyze_form.py)
1. Analyze the form (run analyze-form.ts)
2. Create field mapping (edit fields.json)
3. Validate mapping (run validate_fields.py)
4. Fill the form (run fill_form.py)
5. Verify output (run verify_output.py)
3. Validate mapping (run validate-fields.ts)
4. Fill the form (run fill-form.ts)
5. Verify output (run verify-output.ts)
```
## Conditional Workflows

279
src/skills/builtin/skill-creator/scripts/init-skill.ts Normal file
View File

@@ -0,0 +1,279 @@
#!/usr/bin/env npx ts-node
/**
* Skill Initializer - Creates a new skill from template
*
* Usage:
* npx ts-node init-skill.ts <skill-name> --path <path>
*
* Examples:
* npx ts-node init-skill.ts my-new-skill --path .skills
* npx ts-node init-skill.ts my-api-helper --path ~/.letta/skills
*/
import { chmodSync, existsSync, mkdirSync, writeFileSync } from "node:fs";
import { join, resolve } from "node:path";
const SKILL_TEMPLATE = `---
name: {skill_name}
description: "[TODO: Complete and informative explanation of what the skill does and when to use it. Include WHEN to use this skill - specific scenarios, file types, or tasks that trigger it.]"
---
# {skill_title}
## Overview
[TODO: 1-2 sentences explaining what this skill enables]
## Structuring This Skill
[TODO: Choose the structure that best fits this skill's purpose. Common patterns:
**1. Workflow-Based** (best for sequential processes)
- Works well when there are clear step-by-step procedures
- Example: DOCX skill with "Workflow Decision Tree" → "Reading" → "Creating" → "Editing"
- Structure: ## Overview → ## Workflow Decision Tree → ## Step 1 → ## Step 2...
**2. Task-Based** (best for tool collections)
- Works well when the skill offers different operations/capabilities
- Example: PDF skill with "Quick Start" → "Merge PDFs" → "Split PDFs" → "Extract Text"
- Structure: ## Overview → ## Quick Start → ## Task Category 1 → ## Task Category 2...
**3. Reference/Guidelines** (best for standards or specifications)
- Works well for brand guidelines, coding standards, or requirements
- Example: Brand styling with "Brand Guidelines" → "Colors" → "Typography" → "Features"
- Structure: ## Overview → ## Guidelines → ## Specifications → ## Usage...
**4. Capabilities-Based** (best for integrated systems)
- Works well when the skill provides multiple interrelated features
- Example: Product Management with "Core Capabilities" → numbered capability list
- Structure: ## Overview → ## Core Capabilities → ### 1. Feature → ### 2. Feature...
Patterns can be mixed and matched as needed. Most skills combine patterns (e.g., start with task-based, add workflow for complex operations).
Delete this entire "Structuring This Skill" section when done - it's just guidance.]
## [TODO: Replace with the first main section based on chosen structure]
[TODO: Add content here. See examples in existing skills:
- Code samples for technical skills
- Decision trees for complex workflows
- Concrete examples with realistic user requests
- References to scripts/templates/references as needed]
## Resources
This skill includes example resource directories that demonstrate how to organize different types of bundled resources:
### scripts/
Executable code (TypeScript/Python/Bash/etc.) that can be run directly to perform specific operations.
**Appropriate for:** Scripts that perform automation, data processing, or specific operations.
**Note:** Scripts may be executed without loading into context, but can still be read by the Letta Code agent for patching or environment adjustments.
### references/
Documentation and reference material intended to be loaded into context to inform the Letta Code agent's process and thinking.
**Appropriate for:** In-depth documentation, API references, database schemas, comprehensive guides, or any detailed information that the Letta Code agent should reference while working.
### assets/
Files not intended to be loaded into context, but rather used within the output the Letta Code agent produces.
**Appropriate for:** Templates, boilerplate code, document templates, images, icons, fonts, or any files meant to be copied or used in the final output.
---
**Any unneeded directories can be deleted.** Not every skill requires all three types of resources.
`;
const EXAMPLE_SCRIPT = `#!/usr/bin/env npx ts-node
/**
* Example helper script for {skill_name}
*
* This is a placeholder script that can be executed directly.
* Replace with actual implementation or delete if not needed.
*/
function main() {
console.log("This is an example script for {skill_name}");
// TODO: Add actual script logic here
// This could be data processing, file conversion, API calls, etc.
}
main();
`;
const EXAMPLE_REFERENCE = `# Reference Documentation for {skill_title}
This is a placeholder for detailed reference documentation.
Replace with actual reference content or delete if not needed.
## When Reference Docs Are Useful
Reference docs are ideal for:
- Comprehensive API documentation
- Detailed workflow guides
- Complex multi-step processes
- Information too lengthy for main SKILL.md
- Content that's only needed for specific use cases
## Structure Suggestions
### API Reference Example
- Overview
- Authentication
- Endpoints with examples
- Error codes
- Rate limits
### Workflow Guide Example
- Prerequisites
- Step-by-step instructions
- Common patterns
- Troubleshooting
- Best practices
`;
const EXAMPLE_ASSET = `# Example Asset File
This placeholder represents where asset files would be stored.
Replace with actual asset files (templates, images, fonts, etc.) or delete if not needed.
Asset files are NOT intended to be loaded into context, but rather used within
the output the Letta Code agent produces.
## Common Asset Types
- Templates: .pptx, .docx, boilerplate directories
- Images: .png, .jpg, .svg, .gif
- Fonts: .ttf, .otf, .woff, .woff2
- Boilerplate code: Project directories, starter files
- Icons: .ico, .svg
- Data files: .csv, .json, .xml, .yaml
Note: This is a text placeholder. Actual assets can be any file type.
`;
function titleCaseSkillName(skillName: string): string {
return skillName
.split("-")
.map((word) => word.charAt(0).toUpperCase() + word.slice(1))
.join(" ");
}
function initSkill(skillName: string, path: string): string | null {
const skillDir = resolve(path, skillName);
// Check if directory already exists
if (existsSync(skillDir)) {
console.error(`Error: Skill directory already exists: ${skillDir}`);
return null;
}
// Create skill directory
try {
mkdirSync(skillDir, { recursive: true });
console.log(`Created skill directory: ${skillDir}`);
} catch (e) {
console.error(
`Error creating directory: ${e instanceof Error ? e.message : String(e)}`,
);
return null;
}
const skillTitle = titleCaseSkillName(skillName);
// Create SKILL.md from template
const skillContent = SKILL_TEMPLATE.replace(
/{skill_name}/g,
skillName,
).replace(/{skill_title}/g, skillTitle);
try {
writeFileSync(join(skillDir, "SKILL.md"), skillContent);
console.log("Created SKILL.md");
} catch (e) {
console.error(
`Error creating SKILL.md: ${e instanceof Error ? e.message : String(e)}`,
);
return null;
}
// Create resource directories with example files
try {
// Create scripts/ directory with example script
const scriptsDir = join(skillDir, "scripts");
mkdirSync(scriptsDir, { recursive: true });
const exampleScriptPath = join(scriptsDir, "example.ts");
writeFileSync(
exampleScriptPath,
EXAMPLE_SCRIPT.replace(/{skill_name}/g, skillName),
);
chmodSync(exampleScriptPath, 0o755);
console.log("Created scripts/example.ts");
// Create references/ directory with example reference doc
const referencesDir = join(skillDir, "references");
mkdirSync(referencesDir, { recursive: true });
writeFileSync(
join(referencesDir, "api-reference.md"),
EXAMPLE_REFERENCE.replace(/{skill_title}/g, skillTitle),
);
console.log("Created references/api-reference.md");
// Create assets/ directory with example asset placeholder
const assetsDir = join(skillDir, "assets");
mkdirSync(assetsDir, { recursive: true });
writeFileSync(join(assetsDir, "example-asset.txt"), EXAMPLE_ASSET);
console.log("Created assets/example-asset.txt");
} catch (e) {
console.error(
`Error creating resource directories: ${e instanceof Error ? e.message : String(e)}`,
);
return null;
}
// Print next steps
console.log(`\nSkill '${skillName}' initialized successfully at ${skillDir}`);
console.log("\nNext steps:");
console.log(
"1. Edit SKILL.md to complete the TODO items and update the description",
);
console.log(
"2. Customize or delete the example files in scripts/, references/, and assets/",
);
console.log("3. Run the validator when ready to check the skill structure");
return skillDir;
}
// CLI entry point
if (require.main === module) {
const args = process.argv.slice(2);
if (args.length < 3 || args[1] !== "--path") {
console.log("Usage: npx ts-node init-skill.ts <skill-name> --path <path>");
console.log("\nSkill name requirements:");
console.log(" - Hyphen-case identifier (e.g., 'data-analyzer')");
console.log(" - Lowercase letters, digits, and hyphens only");
console.log(" - Max 64 characters");
console.log(" - Must match directory name exactly");
console.log("\nExamples:");
console.log(" npx ts-node init-skill.ts my-new-skill --path .skills");
console.log(
" npx ts-node init-skill.ts my-api-helper --path ~/.letta/skills",
);
process.exit(1);
}
const skillName = args[0] as string;
const path = args[2] as string;
console.log(`Initializing skill: ${skillName}`);
console.log(`Location: ${path}\n`);
const result = initSkill(skillName, path);
process.exit(result ? 0 : 1);
}
export { initSkill, titleCaseSkillName };

268
src/skills/builtin/skill-creator/scripts/package-skill.ts Normal file
View File

@@ -0,0 +1,268 @@
#!/usr/bin/env npx ts-node
/**
* Skill Packager - Creates a distributable .skill file of a skill folder
*
* Usage:
* npx ts-node package-skill.ts <path/to/skill-folder> [output-directory]
*
* Example:
* npx ts-node package-skill.ts .skills/my-skill
* npx ts-node package-skill.ts .skills/my-skill ./dist
*/
import {
existsSync,
mkdirSync,
readdirSync,
readFileSync,
statSync,
writeFileSync,
} from "node:fs";
import { basename, dirname, join, relative, resolve } from "node:path";
// Simple zip implementation using Node.js built-in zlib
// For a proper zip file, we'll create the structure manually
import { deflateSync } from "node:zlib";
import { validateSkill } from "./validate-skill";
interface ZipEntry {
path: string;
data: Buffer;
isDirectory: boolean;
}
function createZip(entries: ZipEntry[]): Buffer {
// Use archiver-like approach with raw buffer manipulation
// For simplicity, we'll use a basic ZIP format
const localHeaders: Buffer[] = [];
const centralHeaders: Buffer[] = [];
let offset = 0;
for (const entry of entries) {
const pathBuffer = Buffer.from(entry.path, "utf8");
const compressedData = entry.isDirectory
? Buffer.alloc(0)
: deflateSync(entry.data);
const uncompressedSize = entry.isDirectory ? 0 : entry.data.length;
const compressedSize = compressedData.length;
// CRC32 calculation
const crc = entry.isDirectory ? 0 : crc32(entry.data);
// Local file header
const localHeader = Buffer.alloc(30 + pathBuffer.length);
localHeader.writeUInt32LE(0x04034b50, 0); // Local file header signature
localHeader.writeUInt16LE(20, 4); // Version needed to extract
localHeader.writeUInt16LE(0, 6); // General purpose bit flag
localHeader.writeUInt16LE(entry.isDirectory ? 0 : 8, 8); // Compression method (8 = deflate)
localHeader.writeUInt16LE(0, 10); // File last modification time
localHeader.writeUInt16LE(0, 12); // File last modification date
localHeader.writeUInt32LE(crc, 14); // CRC-32
localHeader.writeUInt32LE(compressedSize, 18); // Compressed size
localHeader.writeUInt32LE(uncompressedSize, 22); // Uncompressed size
localHeader.writeUInt16LE(pathBuffer.length, 26); // File name length
localHeader.writeUInt16LE(0, 28); // Extra field length
pathBuffer.copy(localHeader, 30);
localHeaders.push(localHeader);
localHeaders.push(compressedData);
// Central directory header
const centralHeader = Buffer.alloc(46 + pathBuffer.length);
centralHeader.writeUInt32LE(0x02014b50, 0); // Central directory signature
centralHeader.writeUInt16LE(20, 4); // Version made by
centralHeader.writeUInt16LE(20, 6); // Version needed to extract
centralHeader.writeUInt16LE(0, 8); // General purpose bit flag
centralHeader.writeUInt16LE(entry.isDirectory ? 0 : 8, 10); // Compression method
centralHeader.writeUInt16LE(0, 12); // File last modification time
centralHeader.writeUInt16LE(0, 14); // File last modification date
centralHeader.writeUInt32LE(crc, 16); // CRC-32
centralHeader.writeUInt32LE(compressedSize, 20); // Compressed size
centralHeader.writeUInt32LE(uncompressedSize, 24); // Uncompressed size
centralHeader.writeUInt16LE(pathBuffer.length, 28); // File name length
centralHeader.writeUInt16LE(0, 30); // Extra field length
centralHeader.writeUInt16LE(0, 32); // File comment length
centralHeader.writeUInt16LE(0, 34); // Disk number start
centralHeader.writeUInt16LE(0, 36); // Internal file attributes
centralHeader.writeUInt32LE(entry.isDirectory ? 0x10 : 0, 38); // External file attributes
centralHeader.writeUInt32LE(offset, 42); // Relative offset of local header
pathBuffer.copy(centralHeader, 46);
centralHeaders.push(centralHeader);
offset += localHeader.length + compressedData.length;
}
const centralDirOffset = offset;
const centralDirSize = centralHeaders.reduce((sum, h) => sum + h.length, 0);
// End of central directory record
const endRecord = Buffer.alloc(22);
endRecord.writeUInt32LE(0x06054b50, 0); // End of central directory signature
endRecord.writeUInt16LE(0, 4); // Number of this disk
endRecord.writeUInt16LE(0, 6); // Disk where central directory starts
endRecord.writeUInt16LE(entries.length, 8); // Number of central directory records on this disk
endRecord.writeUInt16LE(entries.length, 10); // Total number of central directory records
endRecord.writeUInt32LE(centralDirSize, 12); // Size of central directory
endRecord.writeUInt32LE(centralDirOffset, 16); // Offset of start of central directory
endRecord.writeUInt16LE(0, 20); // Comment length
return Buffer.concat([...localHeaders, ...centralHeaders, endRecord]);
}
// CRC32 implementation
function crc32(data: Buffer): number {
let crc = 0xffffffff;
const table = getCrc32Table();
for (let i = 0; i < data.length; i++) {
// biome-ignore lint/style/noNonNullAssertion: array access within bounds
crc = (crc >>> 8) ^ (table[(crc ^ data[i]!) & 0xff] as number);
}
return (crc ^ 0xffffffff) >>> 0;
}
let crc32Table: number[] | null = null;
function getCrc32Table(): number[] {
if (crc32Table) return crc32Table;
crc32Table = [];
for (let i = 0; i < 256; i++) {
let c = i;
for (let j = 0; j < 8; j++) {
c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1;
}
crc32Table[i] = c;
}
return crc32Table;
}
function getAllFiles(dir: string, baseDir: string): ZipEntry[] {
const entries: ZipEntry[] = [];
const items = readdirSync(dir, { withFileTypes: true });
for (const item of items) {
const fullPath = join(dir, item.name);
const relativePath = relative(baseDir, fullPath);
if (item.isDirectory()) {
entries.push({
path: `${relativePath}/`,
data: Buffer.alloc(0),
isDirectory: true,
});
entries.push(...getAllFiles(fullPath, baseDir));
} else {
entries.push({
path: relativePath,
data: readFileSync(fullPath),
isDirectory: false,
});
}
}
return entries;
}
function packageSkill(skillPath: string, outputDir?: string): string | null {
const resolvedPath = resolve(skillPath);
// Validate skill folder exists
if (!existsSync(resolvedPath)) {
console.error(`Error: Skill folder not found: ${resolvedPath}`);
return null;
}
if (!statSync(resolvedPath).isDirectory()) {
console.error(`Error: Path is not a directory: ${resolvedPath}`);
return null;
}
// Validate SKILL.md exists
const skillMdPath = join(resolvedPath, "SKILL.md");
if (!existsSync(skillMdPath)) {
console.error(`Error: SKILL.md not found in ${resolvedPath}`);
return null;
}
// Run validation before packaging
console.log("Validating skill...");
const { valid, message } = validateSkill(resolvedPath);
if (!valid) {
console.error(`Validation failed: ${message}`);
console.error("Please fix the validation errors before packaging.");
return null;
}
console.log(`${message}\n`);
// Determine output location
const skillName = basename(resolvedPath);
const outputPath = outputDir ? resolve(outputDir) : process.cwd();
if (outputDir && !existsSync(outputPath)) {
mkdirSync(outputPath, { recursive: true });
}
const skillFilename = join(outputPath, `${skillName}.skill`);
// Create the .skill file (zip format)
try {
// Get all files, using parent directory as base so skill folder is included
const parentDir = dirname(resolvedPath);
const entries = getAllFiles(resolvedPath, parentDir);
// Add the skill directory itself
entries.unshift({
path: `${skillName}/`,
data: Buffer.alloc(0),
isDirectory: true,
});
const zipBuffer = createZip(entries);
writeFileSync(skillFilename, zipBuffer);
for (const entry of entries) {
if (!entry.isDirectory) {
console.log(` Added: ${entry.path}`);
}
}
console.log(`\nSuccessfully packaged skill to: ${skillFilename}`);
return skillFilename;
} catch (e) {
console.error(
`Error creating .skill file: ${e instanceof Error ? e.message : String(e)}`,
);
return null;
}
}
// CLI entry point
if (require.main === module) {
const args = process.argv.slice(2);
if (args.length < 1) {
console.log(
"Usage: npx ts-node package-skill.ts <path/to/skill-folder> [output-directory]",
);
console.log("\nExample:");
console.log(" npx ts-node package-skill.ts .skills/my-skill");
console.log(" npx ts-node package-skill.ts .skills/my-skill ./dist");
process.exit(1);
}
const skillPath = args[0] as string;
const outputDir = args[1];
console.log(`Packaging skill: ${skillPath}`);
if (outputDir) {
console.log(`Output directory: ${outputDir}`);
}
console.log();
const result = packageSkill(skillPath, outputDir);
process.exit(result ? 0 : 1);
}
export { packageSkill };

161
src/skills/builtin/skill-creator/scripts/validate-skill.ts Normal file
View File

@@ -0,0 +1,161 @@
#!/usr/bin/env npx ts-node
/**
* Skill Validator - Validates skill structure and frontmatter
*
* Usage:
* npx ts-node validate-skill.ts <skill-directory>
*
* Example:
* npx ts-node validate-skill.ts .skills/my-skill
*/
import { existsSync, readFileSync } from "node:fs";
import { join } from "node:path";
import { parse as parseYaml } from "yaml";
interface ValidationResult {
valid: boolean;
message: string;
}
const ALLOWED_PROPERTIES = new Set([
"name",
"description",
"license",
"allowed-tools",
"metadata",
]);
export function validateSkill(skillPath: string): ValidationResult {
// Check SKILL.md exists
const skillMdPath = join(skillPath, "SKILL.md");
if (!existsSync(skillMdPath)) {
return { valid: false, message: "SKILL.md not found" };
}
// Read content
const content = readFileSync(skillMdPath, "utf-8");
// Check for frontmatter
if (!content.startsWith("---")) {
return { valid: false, message: "No YAML frontmatter found" };
}
// Extract frontmatter
const match = content.match(/^---\n([\s\S]*?)\n---/);
if (!match) {
return { valid: false, message: "Invalid frontmatter format" };
}
const frontmatterText = match[1] as string;
// Parse YAML frontmatter
let frontmatter: Record<string, unknown>;
try {
frontmatter = parseYaml(frontmatterText);
if (typeof frontmatter !== "object" || frontmatter === null) {
return { valid: false, message: "Frontmatter must be a YAML dictionary" };
}
} catch (e) {
return {
valid: false,
message: `Invalid YAML in frontmatter: ${e instanceof Error ? e.message : String(e)}`,
};
}
// Check for unexpected properties
const unexpectedKeys = Object.keys(frontmatter).filter(
(key) => !ALLOWED_PROPERTIES.has(key),
);
if (unexpectedKeys.length > 0) {
return {
valid: false,
message: `Unexpected key(s) in SKILL.md frontmatter: ${unexpectedKeys.sort().join(", ")}. Allowed properties are: ${[...ALLOWED_PROPERTIES].sort().join(", ")}`,
};
}
// Check required fields
if (!("name" in frontmatter)) {
return { valid: false, message: "Missing 'name' in frontmatter" };
}
if (!("description" in frontmatter)) {
return { valid: false, message: "Missing 'description' in frontmatter" };
}
// Validate name
const name = frontmatter.name;
if (typeof name !== "string") {
return {
valid: false,
message: `Name must be a string, got ${typeof name}`,
};
}
const trimmedName = name.trim();
if (trimmedName) {
// Check naming convention (hyphen-case: lowercase with hyphens)
if (!/^[a-z0-9-]+$/.test(trimmedName)) {
return {
valid: false,
message: `Name '${trimmedName}' should be hyphen-case (lowercase letters, digits, and hyphens only)`,
};
}
if (
trimmedName.startsWith("-") ||
trimmedName.endsWith("-") ||
trimmedName.includes("--")
) {
return {
valid: false,
message: `Name '${trimmedName}' cannot start/end with hyphen or contain consecutive hyphens`,
};
}
// Check name length (max 64 characters)
if (trimmedName.length > 64) {
return {
valid: false,
message: `Name is too long (${trimmedName.length} characters). Maximum is 64 characters.`,
};
}
}
// Validate description
const description = frontmatter.description;
if (typeof description !== "string") {
return {
valid: false,
message: `Description must be a string, got ${typeof description}`,
};
}
const trimmedDescription = description.trim();
if (trimmedDescription) {
// Check for angle brackets
if (trimmedDescription.includes("<") || trimmedDescription.includes(">")) {
return {
valid: false,
message: "Description cannot contain angle brackets (< or >)",
};
}
// Check description length (max 1024 characters)
if (trimmedDescription.length > 1024) {
return {
valid: false,
message: `Description is too long (${trimmedDescription.length} characters). Maximum is 1024 characters.`,
};
}
}
return { valid: true, message: "Skill is valid!" };
}
// CLI entry point
if (require.main === module) {
const args = process.argv.slice(2);
if (args.length !== 1) {
console.log("Usage: npx ts-node validate-skill.ts <skill-directory>");
process.exit(1);
}
const { valid, message } = validateSkill(args[0] as string);
console.log(message);
process.exit(valid ? 0 : 1);
}

306
src/tests/skills/skill-creator-scripts.test.ts Normal file
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@@ -0,0 +1,306 @@
/**
* Tests for the bundled skill-creator scripts
*/
import { afterEach, beforeEach, describe, expect, test } from "bun:test";
import { existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs";
import { join } from "node:path";
import {
initSkill,
titleCaseSkillName,
} from "../../skills/builtin/skill-creator/scripts/init-skill";
import { packageSkill } from "../../skills/builtin/skill-creator/scripts/package-skill";
import { validateSkill } from "../../skills/builtin/skill-creator/scripts/validate-skill";
const TEST_DIR = join(import.meta.dir, ".test-skill-creator");
describe("validate-skill", () => {
beforeEach(() => {
if (existsSync(TEST_DIR)) {
rmSync(TEST_DIR, { recursive: true });
}
mkdirSync(TEST_DIR, { recursive: true });
});
afterEach(() => {
if (existsSync(TEST_DIR)) {
rmSync(TEST_DIR, { recursive: true });
}
});
test("validates a valid skill", () => {
const skillDir = join(TEST_DIR, "valid-skill");
mkdirSync(skillDir);
writeFileSync(
join(skillDir, "SKILL.md"),
`---
name: valid-skill
description: A valid test skill
---
# Valid Skill
This is a valid skill.
`,
);
const result = validateSkill(skillDir);
expect(result.valid).toBe(true);
expect(result.message).toBe("Skill is valid!");
});
test("fails when SKILL.md is missing", () => {
const skillDir = join(TEST_DIR, "missing-skill");
mkdirSync(skillDir);
const result = validateSkill(skillDir);
expect(result.valid).toBe(false);
expect(result.message).toBe("SKILL.md not found");
});
test("fails when frontmatter is missing", () => {
const skillDir = join(TEST_DIR, "no-frontmatter");
mkdirSync(skillDir);
writeFileSync(
join(skillDir, "SKILL.md"),
`# No Frontmatter
This skill has no frontmatter.
`,
);
const result = validateSkill(skillDir);
expect(result.valid).toBe(false);
expect(result.message).toBe("No YAML frontmatter found");
});
test("fails when name is missing", () => {
const skillDir = join(TEST_DIR, "no-name");
mkdirSync(skillDir);
writeFileSync(
join(skillDir, "SKILL.md"),
`---
description: A skill without a name
---
# No Name
`,
);
const result = validateSkill(skillDir);
expect(result.valid).toBe(false);
expect(result.message).toBe("Missing 'name' in frontmatter");
});
test("fails when description is missing", () => {
const skillDir = join(TEST_DIR, "no-description");
mkdirSync(skillDir);
writeFileSync(
join(skillDir, "SKILL.md"),
`---
name: no-description
---
# No Description
`,
);
const result = validateSkill(skillDir);
expect(result.valid).toBe(false);
expect(result.message).toBe("Missing 'description' in frontmatter");
});
test("fails when name has invalid characters", () => {
const skillDir = join(TEST_DIR, "invalid-name");
mkdirSync(skillDir);
writeFileSync(
join(skillDir, "SKILL.md"),
`---
name: Invalid_Name
description: A skill with invalid name
---
# Invalid Name
`,
);
const result = validateSkill(skillDir);
expect(result.valid).toBe(false);
expect(result.message).toContain("should be hyphen-case");
});
test("fails when name starts with hyphen", () => {
const skillDir = join(TEST_DIR, "hyphen-start");
mkdirSync(skillDir);
writeFileSync(
join(skillDir, "SKILL.md"),
`---
name: -invalid-start
description: A skill with invalid name
---
# Invalid Start
`,
);
const result = validateSkill(skillDir);
expect(result.valid).toBe(false);
expect(result.message).toContain("cannot start/end with hyphen");
});
test("fails when description contains angle brackets", () => {
const skillDir = join(TEST_DIR, "angle-brackets");
mkdirSync(skillDir);
writeFileSync(
join(skillDir, "SKILL.md"),
`---
name: angle-brackets
description: A skill with <invalid> description
---
# Angle Brackets
`,
);
const result = validateSkill(skillDir);
expect(result.valid).toBe(false);
expect(result.message).toContain("cannot contain angle brackets");
});
test("fails when unexpected frontmatter keys are present", () => {
const skillDir = join(TEST_DIR, "unexpected-keys");
mkdirSync(skillDir);
writeFileSync(
join(skillDir, "SKILL.md"),
`---
name: unexpected-keys
description: A skill with unexpected keys
author: Someone
version: 1.0.0
---
# Unexpected Keys
`,
);
const result = validateSkill(skillDir);
expect(result.valid).toBe(false);
expect(result.message).toContain("Unexpected key(s)");
});
});
describe("init-skill", () => {
beforeEach(() => {
if (existsSync(TEST_DIR)) {
rmSync(TEST_DIR, { recursive: true });
}
mkdirSync(TEST_DIR, { recursive: true });
});
afterEach(() => {
if (existsSync(TEST_DIR)) {
rmSync(TEST_DIR, { recursive: true });
}
});
test("titleCaseSkillName converts hyphenated names", () => {
expect(titleCaseSkillName("my-skill")).toBe("My Skill");
expect(titleCaseSkillName("pdf-editor")).toBe("Pdf Editor");
expect(titleCaseSkillName("big-query-helper")).toBe("Big Query Helper");
});
test("creates a new skill directory with all files", () => {
const result = initSkill("test-skill", TEST_DIR);
expect(result).not.toBeNull();
expect(existsSync(join(TEST_DIR, "test-skill"))).toBe(true);
expect(existsSync(join(TEST_DIR, "test-skill", "SKILL.md"))).toBe(true);
expect(existsSync(join(TEST_DIR, "test-skill", "scripts"))).toBe(true);
expect(existsSync(join(TEST_DIR, "test-skill", "references"))).toBe(true);
expect(existsSync(join(TEST_DIR, "test-skill", "assets"))).toBe(true);
});
test("created skill passes validation", () => {
initSkill("valid-init", TEST_DIR);
// The initialized skill should pass validation (except for TODO in description)
const skillDir = join(TEST_DIR, "valid-init");
expect(existsSync(join(skillDir, "SKILL.md"))).toBe(true);
});
test("fails when directory already exists", () => {
const skillDir = join(TEST_DIR, "existing-skill");
mkdirSync(skillDir, { recursive: true });
const result = initSkill("existing-skill", TEST_DIR);
expect(result).toBeNull();
});
});
describe("package-skill", () => {
beforeEach(() => {
if (existsSync(TEST_DIR)) {
rmSync(TEST_DIR, { recursive: true });
}
mkdirSync(TEST_DIR, { recursive: true });
});
afterEach(() => {
if (existsSync(TEST_DIR)) {
rmSync(TEST_DIR, { recursive: true });
}
});
test("packages a valid skill into a .skill file", () => {
// Create a valid skill
const skillDir = join(TEST_DIR, "packagable-skill");
mkdirSync(skillDir);
writeFileSync(
join(skillDir, "SKILL.md"),
`---
name: packagable-skill
description: A skill that can be packaged
---
# Packagable Skill
This skill can be packaged.
`,
);
const result = packageSkill(skillDir, TEST_DIR);
expect(result).not.toBeNull();
expect(existsSync(join(TEST_DIR, "packagable-skill.skill"))).toBe(true);
});
test("fails when skill directory does not exist", () => {
const result = packageSkill(join(TEST_DIR, "nonexistent"), TEST_DIR);
expect(result).toBeNull();
});
test("fails when SKILL.md is missing", () => {
const skillDir = join(TEST_DIR, "no-skill-md");
mkdirSync(skillDir);
const result = packageSkill(skillDir, TEST_DIR);
expect(result).toBeNull();
});
test("fails when skill validation fails", () => {
const skillDir = join(TEST_DIR, "invalid-skill");
mkdirSync(skillDir);
writeFileSync(
join(skillDir, "SKILL.md"),
`---
name: Invalid_Name
description: Invalid skill
---
# Invalid
`,
);
const result = packageSkill(skillDir, TEST_DIR);
expect(result).toBeNull();
});
});

12
src/tools/impl/Skill.ts
View File

@@ -108,11 +108,15 @@ async function readSkillContent(
skillId: string,
skillsDir: string,
): Promise<string> {
// 1. Check bundled skills first (they have embedded content)
const bundledSkills = getBundledSkills();
// 1. Check bundled skills first (they have a path now)
const bundledSkills = await getBundledSkills();
const bundledSkill = bundledSkills.find((s) => s.id === skillId);
if (bundledSkill?.content) {
return bundledSkill.content;
if (bundledSkill?.path) {
try {
return await readFile(bundledSkill.path, "utf-8");
} catch {
// Bundled skill path not found, continue to other sources
}
}
// 2. Try global skills directory

3
tsconfig.json
View File

@@ -27,5 +27,6 @@
"noUnusedParameters": false,
"noPropertyAccessFromIndexSignature": false
},
"include": ["src/**/*"]
"include": ["src/**/*"],
"exclude": ["src/skills/builtin/**/scripts/**"]
}