# AD-457 Build Report

**Date:** 2026-05-01
**Builder:** Wave 6 continuous-build

## Sections Implemented

| Section | File | Status |
|---|---|---|
| Section 0+5: EventTypes | `src/probos/events.py` | ✅ Added 3 (`DAMAGE_CONTROL_ACTIVATED`, `MAINTENANCE_SCHEDULED`, `PERFORMANCE_THRESHOLD_BREACHED`) |
| Section 1: __init__.py | `src/probos/agents/engineering/__init__.py` (new) | ✅ Re-exports 3 agents |
| Section 2: PerformanceMonitorAgent | `src/probos/agents/engineering/performance_monitor.py` (new) | ✅ |
| Section 3: MaintenanceAgent | `src/probos/agents/engineering/maintenance.py` (new) | ✅ |
| Section 4: DamageControlAgent | `src/probos/agents/engineering/damage_control.py` (new) | ✅ |
| Section 6: EngineeringConfig | `src/probos/config.py` | ✅ Added Pydantic class + field after `pre_flight: PreFlightConfig` (AD-458 just landed) |
| Section 7a: register_template | `src/probos/runtime.py:622+` | ✅ 3 templates registered after engineering_officer |
| Section 7b: pool spawn | `src/probos/startup/agent_fleet.py:140+` | ✅ 3 engineering pools registered after engineering_officer |
| Tests | `tests/test_ad457_engineering_crew.py` (new) | ✅ 14/14 pass at `-n 0` |
| Tracking | `PROGRESS.md`, `docs/development/roadmap.md:4148` | ✅ Updated |

## Test Results

- Focused gate: `pytest tests/test_ad457_engineering_crew.py -v -n 0` → **14/14 passed in 0.28s**
- Full parallel gate: **10,379 passed (+14 vs AD-458 baseline 10,365), 14 skipped**

## Notes / Decisions

- Owns directory creation: `src/probos/agents/engineering/__init__.py` mirrors `agents/medical/__init__.py:1-7` and `agents/security/__init__.py` (AD-455) precedents.
- v1 ships 3 agents only (`PerformanceMonitor`, `Maintenance`, `DamageControl`). The prompt's `InfrastructureAgent` is deferred — overlaps with AD-466 Engineering Infrastructure scope.
- Pool naming `engineering_<role>` follows the `medical_<role>` convention to avoid collision with the existing `engineering_officer` (AD-398) cognitive pool.
- Standard `@runtime_checkable`-style decorators on all class attributes (`agent_type`, `tier`, etc.) match medical pool precedent.
- v1 no-theater: events fire from real conditions even before AD-457b adds consumers. Documented in "What This Does NOT Change" section of the prompt.

## Pre-Commit Sanity Check

10 files changed, ~580 insertions, 4 deletions. Max per-file deletion: 1 line. Well under 200-line threshold.
