python_engineering

Fusion uses a single MCP tool entry point with infinite skill commands:

```python

@omni("git.status") # Get git status

@omni("git.commit", {...}) # Commit with cog validation

@omni("file.read", {...}) # Read file

@omni("help") # Show all skills

```

| Pattern | Example | Dispatches To |

| --------------- | ------------ | ------------------ |

| skill.command | git.status | git.git_status() |

| skill | git | Shows skill help |

Omni can now download and install skills from Git repositories at runtime, enabling true capability expansion:

```bash

# Install a skill from GitHub

omni skill install https://github.com/omni-dev/skill-pandas

# Install specific version

omni skill install https://github.com/omni-dev/skill-docker --version v2.1.0

# Update an installed skill

omni skill update pandas-expert

# List all installed skills

omni skill list

# Show skill details

omni skill info pandas-expert

```

Skill Management Commands

| Command | Description |

| -------------------------------------------------------------- | ---------------------------------- |

| omni skill install | Install skill from Git URL |

| omni skill install --name | Install with custom name |

| omni skill install --version | Install specific branch/tag/commit |

| omni skill update | Update skill to latest |

| omni skill update --strategy stash\|abort\|overwrite | Update with conflict handling |

| omni skill list | List all installed skills |

| omni skill info | Show skill manifest and lockfile |

How It Works

1. Clone/Update: Uses GitPython + subprocess for reliable Git operations
2. Sparse Checkout: Supports monorepo subdirectory installation
3. Dependency Detection: Prevents circular dependencies during install
4. Lockfile: Generates .omni-lock.json for reproducible installs
5. Dirty Handling: Stashes local changes, pulls, then pops (stash strategy)

Omni supports cascading templates with "User Overrides > Skill Defaults" pattern:

```bash

# Check skill structure

omni skill check # Check all skills

omni skill check git # Check specific skill

omni skill check git --examples # With structure examples

# Manage templates (cascading pattern)

omni skill templates list git # List templates with source

omni skill templates eject git commit_message.j2 # Copy default to user dir

omni skill templates info git commit_message.j2 # Show template content

# Create new skill from template

omni skill create my-skill --description "My new skill"

```

Cascading Template Pattern

```

# Priority 1: User Overrides (assets/templates/{skill}/)

assets/templates/git/

├── commit_message.j2 # Custom template (highest priority)

# Priority 2: Skill Defaults (assets/skills/{skill}/temp