Skills Manifest System

FastSkill uses a declarative manifest system inspired by modern package managers like Poetry and npm. This system allows you to define which skills should be installed in your project, manage their versions, and ensure reproducible installations.

Overview

FastSkill uses a unified skill-project.toml file for all project configuration, following industry-standard patterns like pyproject.toml and package.json. The manifest system consists of:

skill-project.toml (project root) - Unified configuration file with [dependencies] section for skill dependencies and [tool.fastskill.repositories] for repository configuration
skills.lock (project root) - Lock file recording exact installed state (like poetry.lock)
skill-project.toml (skill directory) - Skill metadata for authors with [metadata] section

Context Detection

FastSkill automatically detects whether you’re working in a skill directory or project root:

Skill-level: skill-project.toml in directory with SKILL.md → requires [metadata] section with id and version
Project-level: skill-project.toml at project root → requires [dependencies] section

The same file name works in both contexts with different required sections.

skill-project.toml - Project-Level Configuration

The skill-project.toml file at your project root is the source of truth for which skills should be installed in your skills directory.

Basic Structure

# Project root: skill-project.toml

# Optional: Project metadata (for documentation)
[metadata]
name = "my-awesome-project"
version = "1.0.0"
description = "My project that uses FastSkill skills"

# Required: Skill dependencies
[dependencies]
web-scraper = { source = "git", url = "https://github.com/org/web-scraper.git", branch = "main" }
monitoring = { source = "source", name = "team-tools", skill = "monitoring", version = "1.0.0" }

# Optional: Repository configuration
[tool.fastskill.repositories]
[[tool.fastskill.repositories]]
name = "public-registry"
type = "http-registry"
priority = 0
index_url = "https://api.fastskill.io/index"
auth = { type = "pat", env_var = "FASTSKILL_TOKEN" }

Dependency Source Types

All existing dependency source types are supported in the [dependencies] section: Git Repository:

[dependencies]
git-skill = { source = "git", url = "https://github.com/org/skill.git", branch = "main" }

Local Path:

[dependencies]
local-skill = { source = "local", path = "./local-skill" }

ZIP URL:

[dependencies]
zip-skill = { source = "zip-url", zip_url = "https://example.com/skill.zip" }

Registry Source:

[dependencies]
registry-skill = { source = "source", name = "public-registry", skill = "skill-name", version = "1.0.0" }

With Groups:

[dependencies]
dev-skill = { source = "git", url = "https://github.com/org/dev-skill.git", groups = ["dev"] }

Editable Install:

[dependencies]
editable-skill = { source = "local", path = "./skill", editable = true }

Groups

Skills can be organized into groups (like Poetry groups):

[dependencies]
# Default skills (installed in all cases)
web-scraper = { source = "git", url = "https://github.com/org/repo.git" }

# Development group skills
pytest = { source = "source", name = "team-tools", skill = "pytest", groups = ["dev"] }

# Production group skills
monitoring = { source = "source", name = "team-tools", skill = "monitoring", groups = ["prod"] }

Install commands:

fastskill install - Installs all skills (default + all groups)
fastskill install --without dev - Installs all except dev group
fastskill install --only prod - Installs only prod group

Editable Installs

For local development, you can mark skills as editable:

[dependencies]
my-local-skill = { source = "local", path = "./local-skills/my-skill", editable = true, groups = ["dev"] }

Editable skills are installed as symlinks (on Unix) or references, allowing you to edit them in place without reinstalling.

Repository Configuration

Repository configuration is stored in the [tool.fastskill.repositories] section:

[tool.fastskill.repositories]
# HTTP Registry
[[tool.fastskill.repositories]]
name = "public-registry"
type = "http-registry"
priority = 0
index_url = "https://api.fastskill.io/index"
auth = { type = "pat", env_var = "FASTSKILL_TOKEN" }

# Git Marketplace
[[tool.fastskill.repositories]]
name = "team-marketplace"
type = "git-marketplace"
priority = 1
url = "https://github.com/org/skills.git"
branch = "main"

# ZIP URL Repository
[[tool.fastskill.repositories]]
name = "archive-repo"
type = "zip-url"
priority = 2
zip_url = "https://example.com/skills.zip"

# Local Repository
[[tool.fastskill.repositories]]
name = "local-repo"
type = "local"
priority = 3
path = "/path/to/local/skills"

Repositories are searched in priority order (lower number = higher priority). If multiple repositories have the same priority, the first one in the file is used.

skills.lock - Lock File

The skills.lock file at your project root records the exact installed state of all skills for reproducibility.

Structure

[metadata]
version = "1.0.0"
generated_at = "2024-01-01T12:00:00Z"
fastskill_version = "0.1.0"

[[skills]]
id = "web-scraper"
name = "Web Scraper"
version = "1.2.3"
source = { type = "git", url = "https://github.com/org/repo.git", branch = "main" }
commit_hash = "abc123def456789"
fetched_at = "2024-01-01T12:00:00Z"
groups = []
editable = false

Key Differences from skill-project.toml

Feature	skill-project.toml	skills.lock
Purpose	Declarative (what should be)	Exact state (what is installed)
Editable	Yes (user edits)	No (auto-generated)
Versions	Flexible (branches, ranges)	Exact (specific commits/versions)
Commit Hashes	No	Yes (for Git sources)
Timestamps	No	Yes (fetched_at)
Groups	Yes	Yes (from manifest)
Location	Project root	Project root

When Lock File is Updated

The lock file is automatically updated when you:

Run fastskill install
Run fastskill add <skill>
Run fastskill update
Run fastskill remove <skill>

Never edit the lock file manually - it’s generated automatically to ensure accuracy.

Workflow Examples

Development Workflow

# 1. Add a skill to manifest
fastskill add https://github.com/org/skill.git --group dev

# 2. Install all skills
fastskill install

# 3. Commit both files
git add skill-project.toml skills.lock
git commit -m "Add development skill"

Production Deployment

# 1. Install from lock file (reproducible)
fastskill install --lock

# 2. Only production skills
fastskill install --without dev

Team Collaboration

# Developer 1: Adds a skill
fastskill add --group dev pytest

# Developer 2: Gets updates
git pull
fastskill install

# Both have identical skill installations

Version Management

Semantic Versioning

Skills can use semantic versioning when distributed as ZIP files:

[dependencies]
versioned-skill = { source = "zip-url", zip_url = "https://example.com/skill.zip" }

Git-Based Versioning

For Git sources, FastSkill tracks:

Branch: The branch being tracked
Commit Hash: Exact commit installed
Tag: Optional tag reference

# In skill-project.toml (declarative)
[dependencies]
web-scraper = { source = "git", url = "...", branch = "main" }

# In skills.lock (exact state)
[[skills]]
id = "web-scraper"
source = { type = "git", url = "...", branch = "main" }
commit_hash = "abc123def456789"  # Exact commit

skill-project.toml - Skill-Level Configuration

Skill authors can provide comprehensive metadata in skill-project.toml within their skill directory. This file uses the same name as the project-level configuration but serves a different purpose. Full structure:

# my-skill/skill-project.toml

# Required: Skill metadata
[metadata]
id = "my-skill"  # Required: must not contain slashes
version = "1.2.3"  # Required: semantic version
description = "Does something useful"  # Optional
author = "Jane Doe"  # Optional
tags = ["automation", "cli"]  # Optional
capabilities = ["file-processing"]  # Optional

# Optional: Skill dependencies (if this skill depends on other skills)
[dependencies]
other-skill = "1.0.0"
another-skill = { source = "source", name = "registry", skill = "another", version = "2.0.0" }

Key Points:

The id field is required and must not contain forward slashes or scope information
The version field is also required
Skill name for display comes from SKILL.md frontmatter, not from skill-project.toml
Created using fastskill init command in the skill directory
When generating marketplace.json or during skill registration, fields in skill-project.toml take precedence over SKILL.md frontmatter

Context Detection: FastSkill automatically detects skill-level context when skill-project.toml exists in a directory containing SKILL.md, requiring the [metadata] section instead of [dependencies].

Best Practices

1. Commit Both Files

Always commit both skill-project.toml and skills.lock:

git add skill-project.toml skills.lock
git commit -m "Add skills"

2. Use Groups for Environments

Separate development and production skills:

[dependencies]
# Development tools
pytest = { source = "source", name = "team-tools", skill = "pytest", groups = ["dev"] }

# Production monitoring
monitoring = { source = "source", name = "team-tools", skill = "monitoring", groups = ["prod"] }

3. Lock File for Production

Use --lock flag for reproducible production deployments:

fastskill install --lock

4. Regular Updates

Keep skills up to date:

# Check for updates
fastskill update --check

# Update all skills
fastskill update

# Update specific skill
fastskill update my-skill-id

5. Editable for Local Development

Use editable installs for skills you’re developing:

fastskill add ./my-skill -e --group dev

Comparison with Other Package Managers

FastSkill’s manifest system is inspired by modern package managers:

Feature	FastSkill	Poetry	npm
Declarative manifest	`skill-project.toml`	`pyproject.toml`	`package.json`
Lock file	`skills.lock`	`poetry.lock`	`package-lock.json`
Groups	`groups = ["dev"]`	`--group dev`	`devDependencies`
Editable installs	`editable = true`	`-e` flag	`npm link`
Source tracking	Git, ZIP, local	PyPI, Git, local	npm registry, Git

Troubleshooting

Lock File Out of Sync

If your lock file doesn’t match installed skills:

# Regenerate lock file
fastskill install

Missing Skills

If skills are missing after git pull:

# Install from lock file
fastskill install --lock

Version Conflicts

If you see version conflicts:

# Check what's installed
fastskill show

# Update to resolve conflicts
fastskill update

Getting Started

Configuration

Skill Management

Discovery & Routing

Tool Calling

Progressive Loading

API Reference

CLI Reference

Registry

Examples & Tutorials

Advanced Topics

Integration

Community

​Skills Manifest System

​Overview

​Context Detection

​skill-project.toml - Project-Level Configuration

​Basic Structure

​Dependency Source Types

​Groups

​Editable Installs

​Repository Configuration

​skills.lock - Lock File

​Structure

​Key Differences from skill-project.toml

​When Lock File is Updated

​Workflow Examples

​Development Workflow

​Production Deployment

​Team Collaboration

​Version Management

​Semantic Versioning

​Git-Based Versioning

​skill-project.toml - Skill-Level Configuration

​Best Practices

​1. Commit Both Files

​2. Use Groups for Environments

​3. Lock File for Production

​4. Regular Updates

​5. Editable for Local Development

​Comparison with Other Package Managers

​Troubleshooting

​Lock File Out of Sync

​Missing Skills

​Version Conflicts