# Performance Review Report

**Branch**: feat/103-extract-schedule-parser -> main
**Date**: 2026-03-22

## Issues in Your Changes (BLOCKING)

### CRITICAL

No critical performance issues found.

### HIGH

No high severity performance issues found.

## Issues in Code You Touched (Should Fix)

No performance issues found in touched code.

## Pre-existing Issues (Not Blocking)

No pre-existing performance issues found in reviewed files.

## Suggestions (Lower Confidence)

- **Repeated dynamic imports in test helpers** - `tests/unit/cli.test.ts:2500`, `tests/unit/cli.test.ts:2547` (Confidence: 65%) -- Both `simulateScheduleCreate` and `simulateScheduleCreatePipeline` call `await import('../../src/cli/commands/schedule')` on every invocation. While Node.js/Vitest caches dynamic imports after the first resolution, the repeated `await` still adds unnecessary micro-overhead per test call. Consider hoisting the import to module scope or reusing the `parseScheduleCreateArgs` reference already loaded in `beforeAll` at line 1054-1057.

- **Synchronous I/O in `validatePath` called from pure parser** - `src/cli/commands/schedule.ts:81` (Confidence: 60%) -- `parseScheduleCreateArgs` calls `validatePath(next)` which internally uses `fs.realpathSync` (synchronous I/O). This is fine for CLI arg parsing (called once per command), but it means the "pure" parser function is not actually pure -- it has a filesystem side effect. No runtime performance concern at current call frequency, but worth noting if this parser were ever used in a hot path.

## Summary

| Category | CRITICAL | HIGH | MEDIUM | LOW |
|----------|----------|------|--------|-----|
| Blocking | 0 | 0 | 0 | 0 |
| Should Fix | 0 | 0 | 0 | 0 |
| Pre-existing | 0 | 0 | 0 | 0 |

**Performance Score**: 9/10
**Recommendation**: APPROVED

### Rationale

This PR is a clean refactoring that extracts `parseScheduleCreateArgs` as a synchronous, pure-ish function from the previously entangled `scheduleCreate` async function. From a performance perspective:

1. **No regressions introduced.** The arg-parsing loop is O(n) where n is the number of CLI arguments (always small, typically < 20). The refactoring does not add any new allocations, loops, or I/O operations beyond what existed before.

2. **Slight improvement in the production path.** By separating parsing from service calls, the refactored `scheduleCreate` now validates all arguments *before* making any async service calls. This means invalid input fails faster without bootstrapping services unnecessarily (the `handleScheduleCommand` function already had this optimization for read-only commands; now `create` benefits from early validation too).

3. **Test helpers use dynamic imports.** The test file introduces `await import(...)` calls in two helper functions. These are test-only and cached by the module system, so the overhead is negligible. The `beforeAll` block already loads the module once for the `parseScheduleCreateArgs` pure-function tests.

4. **No N+1 queries, no unbounded caches, no blocking I/O in hot paths.** The `validatePath` call uses `realpathSync` but this is a CLI entrypoint called once per command invocation -- not a hot path.
