Our review
Manages installation, update, listing, and removal of agent skills from git repositories.
Strengths
- Supports multiple agents (Claude, Copilot) and scopes (project, personal).
- Centralized caching under ~/.skill/ for faster access.
- Parses git URLs to extract relative path and branch.
- Versioning via YAML frontmatter or last modified timestamp.
Limitations
- Requires network access to download from git.
- Only works with skills formatted as Skill.md with frontmatter.
- Does not support non-git sources (e.g., zip archives).
When you need to install, list, or update agent skills from git repositories with caching and scope management.
If you only use a single agent with no need for version control or skill sharing.
Security analysis
CautionThis skill is a package manager for other AI skills, inherently involving network downloads and file system writes. While the description itself is not malicious, the lack of script transparency and the ability to fetch and execute third-party content from anywhere makes it a potential vector for abuse. Rating as 'caution' due to the powerful but legitimate functionality that could be misused.
- •Relies on external PowerShell scripts (download-skill.ps1, install-skill.ps1, etc.) that are not provided or reviewed; their behavior is undefined.
- •Installs skills from arbitrary user-supplied Git repository URLs without integrity verification, enabling execution of untrusted code.
- •Can write to multiple locations under %USERPROFILE% and project directories, which could be abused to overwrite or add files.
- •No sandboxing or permission checks described; the scripts could potentially perform destructive actions if manipulated.
Examples
List all installed skills for Claude and Copilot, across both project and personal scopes.Install the skill from https://github.com/example/skills/tree/main/my-skillShow me the details and file structure of the installed skill named 'code-reviewer'.name: skills-manager description: Get, List, install, update and uninstall agent skills. Use when user wants to Get, list, install, uninstall and upgrade skills. For install, user should provide a git repo URL. metadata: author: concao version: "1.0"
Skills Manager
This skill helps you Get, list, install, uninstall and update agent skills.
Skill Metadata Format
Skills use YAML frontmatter in Skill.md with the following structure:
---
name: skill-name # Required
description: Brief description # Required
license: Apache-2.0 # Optional
metadata: # Optional
author: example-org
version: "1.0"
---
If version is not specified, the system uses the file's last modified time as the version identifier.
Skills Storage Locations
Skills can be stored at two levels:
1. Machine-Level Cache (Centralized)
All downloaded skills are cached in: %USERPROFILE%\.skill\{skill-name}\
Cache Structure:
~/.skill/{skill-name}/
├── origin/ # Original files downloaded from remote repo
├── parsed/ # Processed skill files ready for installation
└── metadata.json # Skill metadata
metadata.json format:
{
"name": "skill-name",
"description": "Skill description",
"version": "1.0",
"lastUpdated": "2026-01-15T10:30:00Z",
"source": {
"repoUrl": "https://github.com/owner/repo",
"relativePath": "skills/my-skill",
"branch": "main"
}
}
2. Agent-Level Storage
Skills are installed to agent-specific paths based on scope:
| Scope | Agent | Path |
|-------|-------|------|
| Project | Copilot (default) | .github\skills\{skill-name} |
| Project | Claude | .claude\skills\{skill-name} |
| Personal | Copilot (default) | %USERPROFILE%\.copilot\skills\{skill-name} |
| Personal | Claude | %USERPROFILE%\.claude\skills\{skill-name} |
Default behavior:
- If user doesn't specify agent preference: use Copilot paths (
.github/skillsor~/.copilot/skills) - If user doesn't specify scope: default to project scope
Instructions
1. List Skills
List all installed skills across all scopes.
Steps:
- Scan all skill storage locations (project and personal)
- Read the
Skill.mdfile from each skill folder to extract name and description - Display results in a table format
Script: list-skills.ps1
2. Get Skill Details
Get detailed information about a specific skill by name.
Steps:
- Search for the skill in all installed locations
- Parse the
Skill.mdfile to extract name and full description - Display skill details including path and files
Script: get-skill.ps1 -SkillName "name"
3. Install Skills
Install a skill from a git repository URL.
Steps:
Step 3.1: Parse the Git Repository URL
When the user provides a git repository link, parse it to extract:
- Repository URL: The base git repo URL (e.g.,
https://github.com/owner/repo) - Relative Path: The path to the skill folder within the repo (e.g.,
skills/my-skill) - Branch (optional): If specified, use it; otherwise default to
mainormaster
Supported URL formats:
https://github.com/owner/repo/tree/branch/path/to/skillhttps://github.com/owner/repo/path/to/skillhttps://dev.azure.com/org/project/_git/repo?path=/path/to/skill- Raw git URL + relative path provided separately
Step 3.2: Download to Machine Cache
- Create cache structure:
~/.skill/{skill-name}/origin/and~/.skill/{skill-name}/parsed/ - Clone/download files to
origin/folder - Validate skill structure (must contain
Skill.mdorSKILL.md) - Parse skill metadata and copy processed files to
parsed/folder - Create
metadata.jsonwith name, description, version (from frontmatter or last modified time), and source info
Script: download-skill.ps1 -SkillName "name" -RepoUrl "url" -RelativePath "path" [-Branch "branch"]
Step 3.3: Ask User for Installation Scope
Prompt the user to choose:
Where would you like to install this skill?
- Project scope - Available only in this repository (default)
- Personal scope - Available across all your projects
Which scope do you prefer? (1 or 2, default: 1)
Step 3.4: Copy to Agent Path
Based on user's choice, copy from ~/.skill/{skill-name}/parsed/ to the appropriate agent path.
Script: install-skill.ps1 -SkillName "name" -Scope "project|personal" -Agent "copilot|claude"
Step 3.5: Confirm Installation
Success message:
✅ Skill "{skill-name}" installed successfully!
📁 Location: {target-path}
📄 Skill file: {target-path}/Skill.md
📦 Version: {version}
To use this skill, simply ask me about topics related to: {skill-description}
4. Upgrade Skills
Update an existing skill to the latest version from its source repository.
Steps:
Step 4.1: Read Metadata
- Read
~/.skill/{skill-name}/metadata.jsonto get source repo info - If metadata not found, prompt user for repo URL
Step 4.2: Update Origin Files
- Pull latest changes to
~/.skill/{skill-name}/origin/ - Re-parse skill files to
~/.skill/{skill-name}/parsed/ - Update
metadata.jsonwith new version info
Step 4.3: Compare and Update Installed Locations
- Compare version in cache with installed locations
- Copy updated files from
parsed/to all installed locations if newer - Remind user to reopen chat for changes to take effect
Script: upgrade-skill.ps1 -SkillName "name"
Step 4.4: Confirm Upgrade
Success message:
✅ Skill "{skill-name}" upgraded successfully!
📦 New Version: {version}
Updated locations:
- {location-1}
- {location-2}
5. Uninstall Skills
Remove an installed skill from a specific scope.
Steps:
Step 5.1: Locate the Skill
- Search for the skill in all installed locations
- Display where the skill is installed
Step 5.2: Ask User What to Remove
Prompt the user:
The skill "{skill-name}" is installed in the following locations:
.github/skills/{skill-name}(project)~/.copilot/skills/{skill-name}(personal)~/.skill/{skill-name}(machine cache)Which would you like to remove? (1/2/3/all)
Step 5.3: Remove the Skill
Script: uninstall-skill.ps1 -SkillName "name"
Step 5.4: Confirm Removal
Success message:
✅ Skill "{skill-name}" uninstalled from {location}.
Example Usage
User request examples:
- "List all installed skills"
- "Get details about sfi-handler skill"
- "Install the skill from https://github.com/myorg/skills/tree/main/sfi-handler"
- "Install skill from https://github.com/user/repo path: skills/my-skill to personal scope"
- "Upgrade my sfi-handler skill"
- "Uninstall the old-skill from my personal skills"
Troubleshooting
Common Issues
- Git not installed: Ensure git is available in PATH
- Permission denied: Run with appropriate permissions
- Invalid skill structure: Skill folder must contain Skill.md or SKILL.md
- Network issues: Check internet connectivity and repository access
Validation Checklist
- [ ] Repository URL is accessible
- [ ] Skill folder contains Skill.md or SKILL.md
- [ ] Target directory is writable
- [ ] No naming conflicts with existing skills
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