# Review — Andrej Karpathy (Round 1)

**PRD**: `cOS_prds/20260329_213252_prd_when_we_implement_a_new_functionality_from_the_tasks_it_should_not_happen_in_par.md`
**Branch**: `colonyos/when_we_implement_a_new_functionality_from_the_tasks_it_should_not_happen_in_par`

## Assessment

The branch has **zero commits** beyond `main`. HEAD and main are the same commit (`c743759`). The working tree contains uncommitted changes with **unresolved merge conflict markers** in 3 files (`config.py`, `models.py`) and multiple files in unmerged (`UU`) state. The codebase doesn't parse — `pytest` fails immediately with `SyntaxError` at line 1062 of `config.py` due to `<<<<<<< HEAD` conflict markers.

## What was attempted (working tree analysis)

Only **Task 1.0** (flip config default) shows partial progress:
- **FR-1** ✅ `ParallelImplementConfig.enabled` default flipped to `False` (line 146)
- **FR-2** ✅ `DEFAULTS["parallel_implement"]["enabled"]` flipped to `False` (line 53)
- **FR-8** ✅ Warning log when parallel is explicitly enabled (line 488-492)
- Test updates for `test_parallel_config.py` and `test_parallel_orchestrator.py` look correct

But the changes were never committed, and the merge/rebase that produced the `UU` state was never resolved.

## What is completely missing

| Requirement | Status |
|-------------|--------|
| FR-3: Sequential task runner | ❌ Not implemented — orchestrator unchanged |
| FR-4: Topological sort ordering | ❌ Not implemented |
| FR-5: Per-task commits | ❌ Not implemented |
| FR-6: DAG-aware failure handling (BLOCKED) | ❌ Not implemented |
| FR-7: Budget division by task count | ❌ Not implemented |
| FR-9: PhaseResult per-task artifacts | ❌ Not implemented |
| FR-10: Parallel mode preserved | ⚠️ Code untouched but tests can't run |

The orchestrator still uses the old single-prompt fallback at line 3689-3708 — it dumps all tasks into one agent session rather than running them one-at-a-time with commits between each. This is the **entire point** of the PRD and it's absent.

## The irony

This PRD is about making sequential implementation the default because parallel execution causes merge conflicts. The implementation attempt itself appears to have been derailed by merge conflicts from the implementation agent trying to work in parallel on the same files.

## Checklist

- [ ] **Completeness**: 2/10 FRs partially addressed, 0/6 tasks completed, 0 commits
- [ ] **Quality**: SyntaxError in config.py, tests cannot run
- [ ] **Safety**: No secrets, no destructive ops — but only because nothing was shipped

---

VERDICT: request-changes

FINDINGS:
- [src/colonyos/config.py]: Unresolved merge conflict markers at lines 1062, 1107, 1109, 1121, 1124, 1127 — file doesn't parse
- [src/colonyos/models.py]: Unresolved merge conflict markers at lines 401, 403, 405
- [src/colonyos/orchestrator.py]: No changes made — sequential task runner (FR-3, FR-4, FR-5, FR-6, FR-7) completely missing; still uses single-prompt fallback
- [branch state]: Zero commits on branch — HEAD equals main. All changes are uncommitted and in broken merge state
- [tests/]: Cannot run due to SyntaxError in config.py; updated test assertions look correct but are untestable

SYNTHESIS:
This implementation is dead on arrival. The branch has zero commits, the working tree has unresolved merge conflicts that prevent the code from parsing, and the core deliverable — the sequential task runner in the orchestrator — was never started. Only the config default flip (Task 1.0) shows partial progress, and even that is trapped behind conflict markers. The implementation needs to start over: resolve or reset the merge state, commit the config changes cleanly, then build the sequential runner which is 80% of the PRD's value. From an AI engineering perspective, the failure mode here is instructive — the implementation agent appears to have attempted parallel file edits that conflicted, which is exactly the problem this PRD exists to solve. The fix should use the very pattern being implemented: sequential, one-task-at-a-time execution with commits between steps.
