# Review by Staff Security Engineer (Round 1)

Now I have a complete picture. Let me write the review.

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## Staff Security Engineer Review

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

### Summary of Findings

The branch has **zero code changes**. `HEAD` on this branch (`c743759`) is the exact same commit as `main`. The branch was created and the PRD/task artifacts were written, but no implementation work was performed. All 6 parent tasks and all subtasks remain unchecked.

### Checklist Assessment

| Item | Status | Notes |
|------|--------|-------|
| **Completeness** | ❌ | 0/10 FRs implemented. 0/6 parent tasks done. No code changes on branch. |
| FR-1: Flip `ParallelImplementConfig.enabled` default | ❌ Not implemented | |
| FR-2: Flip `DEFAULTS` dict | ❌ Not implemented | |
| FR-3: Sequential task runner | ❌ Not implemented | |
| FR-4: Topological sort ordering | ❌ Not implemented | |
| FR-5: Per-task commits | ❌ Not implemented | |
| FR-6: DAG-aware failure/skip | ❌ Not implemented | |
| FR-7: Budget division | ❌ Not implemented | |
| FR-8: Parallel opt-in warning | ❌ Not implemented | |
| FR-9: PhaseResult consistency | ❌ Not implemented | |
| FR-10: Parallel code preserved | ✅ Trivially — nothing was changed | |
| **Quality** | N/A | No code to assess |
| **Safety** | N/A | No code to assess |

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VERDICT: request-changes

FINDINGS:
- [branch]: No implementation commits exist — branch HEAD is identical to main (both at c743759). Zero functional requirements are implemented.
- [cOS_tasks/20260329_213252_tasks_when_we_implement_a_new_functionality_from_the_tasks_it_should_not_happen_in_par.md]: All 6 parent tasks and all subtasks remain unchecked ([ ]).
- [src/colonyos/config.py]: FR-1 and FR-2 (flip parallel default) not done — `ParallelImplementConfig.enabled` still defaults to `True`.
- [src/colonyos/orchestrator.py]: FR-3 through FR-9 (sequential runner, topo ordering, per-task commits, failure handling, budget division, warning log, PhaseResult) — none implemented.

SYNTHESIS:
From a security standpoint, there is nothing to review because no code was written. The branch is an empty shell — identical to main with zero diff. All 10 functional requirements from the PRD are unimplemented, and all task checkboxes remain unchecked. This is a complete non-delivery. The implementation phase must be re-executed before a meaningful security review can be performed. When implementation does land, I'll be watching for: (1) whether the per-task agent sessions properly sandbox budget and permissions, (2) whether the sequential runner's commit-after-each-task flow prevents one task's agent from reading secrets written by a prior task's agent, (3) whether the parallel opt-in warning log leaks any config details that shouldn't be in stdout, and (4) whether the budget division logic can be manipulated by crafting a task file with inflated task counts to starve legitimate tasks. But none of that matters until code actually exists on this branch.
