# feagi-config Implementation Complete ✅

## Summary

The `feagi-config` crate has been fully implemented as a core, reusable component of the FEAGI 2.0 Rust architecture.

## Implementation Details

### 1. Crate Structure

```
feagi-core/crates/feagi-config/
├── Cargo.toml              # Dependencies and feature flags
├── README.md               # User documentation
├── src/
│   ├── lib.rs              # Main crate entry point
│   ├── types.rs            # All configuration structs
│   ├── loader.rs           # 3-tier override system
│   └── validation.rs       # Configuration validation
└── tests/                  # Integration tests (in modules)
```

### 2. Features Implemented

#### ✅ Type-Safe Configuration Structs
- `FeagiConfig` (root)
- `SystemConfig`, `ApiConfig`, `AgentConfig`, `PortsConfig`
- `ZmqConfig`, `TimeoutsConfig`, `NeuralConfig`, `PlasticityConfig`
- `BurstEngineConfig`, `ConnectomeConfig`, `ResourcesConfig`
- `LoggingConfig`, `VisualizationConfig`, `CompressionConfig`
- `MemoryProcessingConfig`, `SnapshotConfig`
- All structs with proper `Default` implementations matching Python config

#### ✅ 3-Tier Override System
1. **TOML File** (base defaults)
   - Searches: `FEAGI_CONFIG_PATH`, `./`, `../`, workspace root (up to 5 levels)
   - Parses `feagi_configuration.toml` with full validation

2. **Environment Variables** (runtime overrides)
   - `FEAGI_API_HOST`, `FEAGI_API_PORT`, `FEAGI_ZMQ_HOST`
   - `FEAGI_DATA_DIR`, `FEAGI_MAX_CORES`, `FEAGI_LOG_LEVEL`
   - All ZMQ port overrides (`FEAGI_ZMQ_*_PORT`)

3. **CLI Arguments** (explicit overrides)
   - HashMap-based for flexibility
   - Highest priority in override chain

#### ✅ Comprehensive Validation
- Port range validation (1024-65535 for non-root)
- Port conflict detection (within namespaces)
- Required field validation (hosts cannot be empty)
- Value range validation (GPU memory fraction 0.0-1.0)
- Enum validation (burst_engine.mode must be "inference" or "design")

#### ✅ Feature Flags
- `std` (default): Full TOML loading with filesystem access
- `no_std`: For embedded/RTOS (compile-time config)
- `wasm`: For WebAssembly (JS-provided config)

### 3. Test Coverage

All 12 tests passing:

#### Loader Tests
- ✅ `test_find_config_file_env_var` - Environment variable config path
- ✅ `test_load_minimal_config` - Minimal TOML parsing
- ✅ `test_environment_overrides` - Environment variable overrides
- ✅ `test_cli_overrides` - CLI argument overrides
- ✅ `test_override_precedence` - 3-tier precedence (TOML < ENV < CLI)

#### Validation Tests
- ✅ `test_default_config_is_valid` - Default config passes validation
- ✅ `test_invalid_port_range` - Ports < 1024 rejected
- ✅ `test_port_conflict` - Port conflicts detected
- ✅ `test_missing_required_field` - Empty hosts rejected
- ✅ `test_invalid_gpu_memory_fraction` - Values outside 0.0-1.0 rejected
- ✅ `test_invalid_burst_engine_mode` - Invalid modes rejected

#### Library Tests
- ✅ `test_config_types_compile` - All types compile correctly

#### Documentation Tests
- ✅ README examples compile and run

### 4. Integration with Other Crates

#### ✅ Workspace Integration
- Added to `feagi-core/Cargo.toml` workspace members (Foundation Layer)
- Listed as: `"crates/feagi-config"  # Configuration loader (TOML + overrides)`

#### ✅ feagi-inference-engine Integration
- Added `feagi-config` dependency
- Updated `main.rs` to:
  - Load configuration from file or search
  - Validate configuration
  - Log configuration source (file vs. CLI)
  - Fall back gracefully to CLI args if config not found
- New CLI argument: `--config <path>` for explicit config file

### 5. Architecture Compliance

#### Enforces FEAGI 2.0 Principles
- ❌ **No hardcoded values** (enforced by validation)
- ✅ **Single source of truth** (`feagi_configuration.toml`)
- ✅ **Environment-specific overrides** (3-tier system)
- ✅ **Cross-platform compatibility** (std, no_std, wasm features)

#### Mirrors Python Implementation
- All config sections from Python's `feagi_configuration.toml` included
- All override environment variables supported
- Same validation logic as Python's `toml_loader.py`

### 6. Documentation

#### ✅ README.md
- Quick start guide
- Usage examples (basic, CLI overrides, environment variables)
- Configuration file structure
- Supported environment variables table
- Feature flags explanation
- Architecture compliance notes

#### ✅ Inline Documentation
- All public functions have doc comments
- Examples in doc comments compile and run
- Module-level documentation

#### ✅ Generated Documentation
- `cargo doc` generates complete API documentation
- Available at: `target/doc/feagi_config/index.html`

### 7. Dependencies

```toml
[dependencies]
serde = { version = "1.0", features = ["derive"], default-features = false }
toml = { version = "0.8", optional = true }  # std feature only
thiserror = "1.0"

[dev-dependencies]
serde_json = "1.0"
tempfile = "3.8"
```

## Usage Example

```rust
use feagi_config::{load_config, validate_config};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Load configuration (searches automatically)
    let config = load_config(None, None)?;
    
    // Validate
    validate_config(&config)?;
    
    // Use type-safe values
    println!("API running on {}:{}", config.api.host, config.api.port);
    println!("ZMQ sensory port: {}", config.ports.zmq_sensory_port);
    println!("Burst timestep: {}ms", config.neural.burst_engine_timestep);
    
    Ok(())
}
```

## Next Steps

The `feagi-config` crate is production-ready and can now be:
1. ✅ Used by all Rust components (already integrated into `feagi-inference-engine`)
2. 🚧 Integrated into `feagi-api` (replace hardcoded values)
3. 🚧 Integrated into `feagi-io` (replace ZMQ hardcoded endpoints)
4. 🚧 Integrated into `feagi-burst-engine` (use burst_engine config section)
5. 🚧 Published to crates.io as part of FEAGI 2.0 release

## Build & Test Commands

```bash
cd /Users/nadji/code/FEAGI-2.0/feagi-core

# Build
cargo build -p feagi-config

# Test
cargo test -p feagi-config

# Documentation
cargo doc -p feagi-config --no-deps --open

# Check all features
cargo check -p feagi-config --all-features
cargo check -p feagi-config --no-default-features
```

## Status: ✅ COMPLETE

All 8 TODO items completed:
- ✅ Create feagi-config crate structure and Cargo.toml
- ✅ Implement core configuration structs
- ✅ Implement config loader with 3-tier override system
- ✅ Implement validation logic
- ✅ Add comprehensive tests (12/12 passing)
- ✅ Wire feagi-config into feagi-inference-engine
- ✅ Update workspace Cargo.toml
- ✅ Add documentation and examples

---

**Date**: October 30, 2025  
**Crate Version**: 2.0.0  
**Lines of Code**: ~1,500 LOC (types: 800, loader: 300, validation: 300, lib: 100)




