# cursor - Functional Specification

**Version**: v1.1.9 | **Status**: Active | **Last Updated**: March 2026

## Purpose

Integration with Cursor IDE, providing programmatic access to AI-first code editing capabilities including Composer automation, rules management, and model configuration.

## Design Principles

### Modularity

- Composer automation separated from rules management
- Model configuration as independent component
- Clear separation of concerns

### Functionality

- Real working integration with Cursor
- Full coverage of available capabilities
- Production-ready implementation

## Functional Requirements

### Composer Automation

1. Start/stop Composer sessions
2. Submit prompts programmatically
3. Capture and process responses
4. Handle multi-turn conversations

### Rules Management

1. Read .cursorrules files
2. Update rule configurations
3. Validate rule syntax
4. Apply rules to workspace

### Model Configuration

1. List available models
2. Switch active model
3. Configure model parameters
4. Save preferences

## Interface Contracts

### CursorClient

```python
class CursorClient(IDEClient):
    def connect(self) -> bool: ...
    def disconnect(self) -> None: ...
    def get_capabilities(self) -> dict: ...
    def get_rules(self) -> dict: ...
    def update_rules(self, rules: dict) -> bool: ...
    def get_models(self) -> List[str]: ...
    def set_model(self, model: str) -> bool: ...
```

## Navigation

- **Human Documentation**: [README.md](README.md)
- **Technical Documentation**: [AGENTS.md](AGENTS.md)
- **Parent**: [ide](../README.md)

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## Detailed Architecture and Implementation

### Design Principles

1. **Strict Modularity**: Each component is isolated and communicates via well-defined APIs.
2. **Performance Optimization**: Implementation leverages lazy loading and intelligent caching to minimize resource overhead.
3. **Error Resilience**: Robust exception handling ensures system stability even under unexpected conditions.
4. **Extensibility**: The architecture is designed to accommodate future enhancements without breaking existing contracts.

### Technical Implementation

The codebase utilizes modern Python features (version 3.10+) to provide a clean, type-safe API. Interaction patterns are documented in the corresponding `AGENTS.md` and `SPEC.md` files, ensuring that both human developers and automated agents can effectively utilize these capabilities.
