Aider Configuration

Production-ready configuration file for [Aider](https://aider.chat/), optimized for AI-assisted coding with Claude Sonnet 4.5 via OpenRouter. Includes auto-testing, linting, file watching, and Git attribution.

What This Configuration Does

Setup Instructions

1. **Save this configuration as `.aider.conf.yml` in your project root**

2. **Set your OpenRouter API key**

Replace `put-your-key-here` on line 55 with your actual OpenRouter API key:

```yaml

api-key: openrouter=YOUR_OPENROUTER_API_KEY

```

Alternatively, store it in a `.env` file:

```bash

OPENROUTER_API_KEY=your_key_here

```

3. **Install Aider**

```bash

pip install aider-chat

```

4. **Launch Aider**

```bash

aider

```

Aider will automatically load `.aider.conf.yml` from your project root.

Key Configuration Options

Models

Features Enabled

Customization

To customize lint commands for your language:

```yaml

lint-cmd:

- "python: pylint --select=E,W"

- "javascript: eslint --fix"

- "typescript: eslint --fix"

```

To change the test command:

```yaml

test-cmd: pytest tests/

```

To disable auto-testing:

```yaml

auto-test: false

```

File Locations

Git Attribution

This config attributes commits to Aider using the `Co-authored-by` trailer. To change attribution style:

```yaml

attribute-author: true # Attribute in author name

attribute-committer: true # Attribute in committer name

attribute-commit-message-author: true # Prefix with "aider:"

```

Language Settings

Change these if needed:

```yaml

chat-language: spanish

commit-language: french

```

Advanced: Provider Configuration

To use a different provider (OpenAI, Anthropic direct, etc.):

```yaml

model: gpt-4o

openai-api-key: YOUR_OPENAI_KEY

```

Or with Anthropic:

```yaml

model: claude-sonnet-4.5

anthropic-api-key: YOUR_ANTHROPIC_KEY

```

Constraints

References