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sideline/.opencode/skills/mainline-presets/SKILL.md

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---
name: mainline-presets
description: Creating pipeline presets in TOML format for Mainline
compatibility: opencode
metadata:
audience: developers
source_type: codebase
---
## What This Skill Covers
This skill covers how to create pipeline presets in TOML format for Mainline's rendering pipeline.
## Key Concepts
### Preset Loading Order
Presets are loaded from multiple locations (later overrides earlier):
1. Built-in: `engine/presets.toml`
2. User config: `~/.config/mainline/presets.toml`
3. Local override: `./presets.toml`
### PipelinePreset Dataclass
```python
@dataclass
class PipelinePreset:
name: str
description: str = ""
source: str = "headlines" # Data source
display: str = "terminal" # Display backend
camera: str = "scroll" # Camera mode
effects: list[str] = field(default_factory=list)
border: bool = False
```
### TOML Format
```toml
[presets.my-preset]
description = "My custom pipeline"
source = "headlines"
display = "terminal"
camera = "scroll"
effects = ["noise", "fade"]
border = true
```
## Creating a Preset
### Option 1: User Config
Create/edit `~/.config/mainline/presets.toml`:
```toml
[presets.my-cool-preset]
description = "Noise and glitch effects"
source = "headlines"
display = "terminal"
effects = ["noise", "glitch"]
```
### Option 2: Local Override
Create `./presets.toml` in project root:
```toml
[presets.dev-inspect]
description = "Pipeline introspection for development"
source = "headlines"
display = "terminal"
effects = ["hud"]
```
### Option 3: Built-in
Edit `engine/presets.toml` (requires PR to repository).
## Available Sources
- `headlines` - RSS news feeds
- `poetry` - Literature mode
- `pipeline-inspect` - Live DAG visualization
## Available Displays
- `terminal` - ANSI terminal
- `websocket` - Web browser
- `null` - Headless
- `moderngl` - GPU-accelerated (optional)
## Available Effects
See `effects_plugins/`:
- noise, fade, glitch, firehose
- border, crop, tint, hud
## Validation Functions
Use these from `engine/pipeline/presets.py`:
- `validate_preset()` - Validate preset structure
- `validate_signal_path()` - Detect circular dependencies
- `generate_preset_toml()` - Generate skeleton preset