# [Component Name] Specification

> Version: 1.0 | Status: Draft | Last Updated: YYYY-MM-DD

## 1. Overview

### 1.1 Purpose
Brief description of what this component does and why it exists.

### 1.2 Scope
- **In scope**: What this component handles
- **Out of scope**: What is explicitly NOT handled

### 1.3 Design Goals
- Goal 1
- Goal 2
- Goal 3

## 2. Architecture

### 2.1 Crate Structure
```
component/
├── crates/
│   ├── component-api/      # gRPC service definitions
│   ├── component-client/   # Client library
│   ├── component-core/     # Core business logic
│   ├── component-server/   # Server binary
│   ├── component-storage/  # Persistence layer
│   └── component-types/    # Shared types
└── proto/                  # Protocol definitions
```

### 2.2 Data Flow
```
[Client] → [API Layer] → [Core Logic] → [Storage]
                ↓
          [Consensus] (if distributed)
```

### 2.3 Dependencies
| Crate | Purpose |
|-------|---------|
| tokio | Async runtime |
| tonic | gRPC framework |
| ... | ... |

## 3. API

### 3.1 gRPC Services
```protobuf
service ServiceName {
  rpc Method(Request) returns (Response);
}
```

### 3.2 Public Traits
```rust
pub trait TraitName {
    async fn method(&self, input: Input) -> Result<Output>;
}
```

### 3.3 Client Library
```rust
let client = Client::connect("http://localhost:2379").await?;
let value = client.get("key").await?;
```

## 4. Data Models

### 4.1 Core Types
```rust
pub struct CoreType {
    field: Type,
}
```

### 4.2 Storage Format
- **Engine**: RocksDB / SQLite / Memory
- **Serialization**: Protocol Buffers / MessagePack
- **Key format**: Describe key structure

## 5. Configuration

### 5.1 Config File Format (TOML)
```toml
[section]
key = "value"
```

### 5.2 Environment Variables
| Variable | Default | Description |
|----------|---------|-------------|
| VAR_NAME | value | What it does |

### 5.3 CLI Arguments
```
component-server [OPTIONS]
  --config <PATH>    Config file path
  --data-dir <PATH>  Data directory
```

## 6. Security

### 6.1 Authentication
- Method (mTLS / tokens / etc.)

### 6.2 Authorization
- Access control model

### 6.3 Multi-tenancy
- Isolation mechanisms
- Namespace/org scoping

## 7. Operations

### 7.1 Deployment
- Single node
- Cluster mode

### 7.2 Monitoring
- Metrics exposed (Prometheus format)
- Health endpoints

### 7.3 Backup & Recovery
- Snapshot mechanism
- Point-in-time recovery

## 8. Compatibility

### 8.1 API Versioning
- Version scheme
- Deprecation policy

### 8.2 Wire Protocol
- Protocol buffer version
- Backward compatibility guarantees

## Appendix

### A. Error Codes
| Code | Meaning |
|------|---------|
| ... | ... |

### B. Glossary
- **Term**: Definition