# CodeMode Optimization Summary

> Historical note: the measurements below describe the original minimal-stdlib optimization. For current benchmarks and the latest orchestration changes, see [PERFORMANCE.md](PERFORMANCE.md).

## ✅ Completed Optimizations

### 1. Performance Optimization (40% faster)

**Problem**: CodeMode was loading the entire Go stdlib (~50+ packages) on every execution, taking ~1.5ms and allocating ~2MB.

**Solution**: Load only the 3 packages actually needed (context, fmt, reflect) and cache them with `sync.Once`.

**Results**:
- **Execution time**: 1.63ms → 0.98ms (40% faster)
- **Memory usage**: 2.13MB → 1.34MB (37% less)
- **Throughput**: 723 ops/sec → 1186 ops/sec (64% increase)

### 2. Walrus Operator Fix

**Problem**: The `convertOutWalrus` function was incorrectly converting `:=` to `=` in all contexts, breaking multi-variable declarations and causing compilation errors like `expected ';', found ':='`.

**Solution**: Updated the regex to only convert `__out :=` when `__out` is the sole variable being declared at the start of a line, preserving multi-variable declarations like `__out, err := ...`.

**Implementation**:
```go
func convertOutWalrus(code string) string {
	// Only convert `__out :=` when __out is the sole variable being declared
	// This avoids breaking multi-variable declarations like `result, err := ...`
	// Use capture groups to preserve both leading whitespace and spacing before :=
	re := regexp.MustCompile(`(?m)^(\s*)__out(\s*):=`)
	return re.ReplaceAllString(code, "${1}__out${2}=")
}
```

**Test Coverage**: Added comprehensive tests in `preprocess_test.go` to verify:
- ✅ Simple `__out :=` conversion
- ✅ Preserves leading whitespace
- ✅ Does NOT convert multi-variable declarations (`__out, err := ...`)
- ✅ Works in nested blocks
- ✅ Leaves other variable declarations untouched

## 📊 Final Benchmark Results

```
BenchmarkExecuteSimple-8   1186   981,468 ns/op   1,336,425 B/op   15,226 allocs/op
```

Compared to original:
```
BenchmarkExecuteSimple-8    723  1,632,590 ns/op   2,126,798 B/op   16,162 allocs/op
```

## 🧪 Testing

All tests pass:
- ✅ All existing codemode tests
- ✅ New walrus operator conversion tests  
- ✅ Preprocessing tests
- ✅ Orchestrator tests

## 📝 Files Modified

1. `/src/plugins/codemode/codemode.go`
   - Added `getMinimalStdlib()` function with caching
   - Updated `injectHelpers()` to use minimal stdlib
   - Fixed `convertOutWalrus()` regex

2. `/src/plugins/codemode/benchmark_test.go` (new)
   - Added benchmarks for interpreter initialization
   - Added benchmarks for stdlib loading
   - Added benchmarks for code execution

3. `/src/plugins/codemode/preprocess_test.go` (new)
   - Added tests for `convertOutWalrus()`
   - Added tests for `preprocessUserCode()`

4. `/src/plugins/codemode/PERFORMANCE.md` (new)
   - Documented performance improvements
   - Included benchmark comparisons
   - Outlined future optimization opportunities

## 🎯 Impact

- **Faster agent operations**: 40% reduction in code execution time
- **Better scalability**: 64% higher throughput
- **Lower resource usage**: 37% less memory per execution
- **More reliable**: Fixed walrus operator bug that was causing compilation errors
- **Better tested**: Added comprehensive test coverage for preprocessing logic

## 🔮 Future Optimization Opportunities

1. **Interpreter Pooling**: Reuse interpreters instead of creating new ones (~5ms saved per execution)
2. **AST Caching**: Cache parsed/wrapped programs for repeated code snippets
3. **Lazy Helper Injection**: Only inject UTCP helpers when tools are actually called
4. **Parallel Compilation**: Compile user code in parallel with helper injection
