# BRIEFING — 2026-10-01T03:15:00Z

## Mission
Investigate previous gate failures and formulate exact drop-in code fixes for `server/world/level_progression_service.py` covering Level 100 cumulative EXP clamping, death penalty listener/counter behavior, EXP non-negative sanitization, and line count limits.

## 🔒 My Identity
- Archetype: explorer
- Roles: teamwork_preview_explorer
- Working directory: c:\Projects\FreeExile\.agents\teamwork\explorer_m2_progression_1_gen2
- Original parent: 6f4a2aa2-4315-4660-8cb7-8352a7220c95
- Milestone: Milestone M2 Iteration 2

## 🔒 Key Constraints
- Read-only investigation — do NOT implement / modify source code directly
- Write only to working directory: `c:\Projects\FreeExile\.agents\teamwork\explorer_m2_progression_1_gen2`
- Formulate exact drop-in code fixes for `server/world/level_progression_service.py`
- Verify line budget (<= 350 soft cap, <= 500 hard cap)
- Deliverables: report.md, handoff.md, send_message to parent

## Current Parent
- Conversation ID: 6f4a2aa2-4315-4660-8cb7-8352a7220c95
- Updated: 2026-10-01T03:08:31Z

## Investigation State
- **Explored paths**:
  - `c:\Projects\FreeExile\.agents\teamwork\ORIGINAL_REQUEST.md` (## 2026-10-01T00:40:44Z)
  - `c:\Projects\FreeExile\.agents\teamwork\orchestrator_4\PROJECT.md`
  - Gate failure reports: `reviewer_m2_progression_1/handoff.md`, `reviewer_m2_progression_2/handoff.md`, `challenger_m2_progression_2/handoff.md`
  - `server/world/level_progression_service.py`
  - `server/world/level_progression_curve.py`
  - `server/world/level_progression_types.py`
  - `server/world/combat_engine.py`
  - `tests/unit/test_level_progression_service.py`
  - `tests/e2e/test_level_progression_e2e.py`
- **Key findings**:
  - Level 100 benchmark cumulative EXP is strictly `24,285,477,315`. Clamping `cumulative_exp = min(self.get_canonical_benchmark(100).cumulative_exp, cumulative_exp)` guarantees zero overflow.
  - Early return at line 299 in `apply_death_penalty()` silenced Level 100 death telemetry and skipped `_death_listeners`. Removing it allows standard 0.0 ratio, 0 EXP loss, `deaths_count + 1`, and listener notification.
  - Negative `base_exp` and `raw_exp` injection clamped to `max(0, ...)` eliminates unintended EXP depletion on kill.
  - Proposed drop-in implementation achieves **340 lines** (<= 350 soft cap) and function AST length <= 47 lines (<= 50 line rule).
- **Unexplored areas**: None. All assigned requirements investigated, formulated, and validated.

## Key Decisions Made
- Implemented `get_canonical_benchmark(level: int) -> LevelExpBenchmark` returning `self._benchmarks.get(level) or self._benchmarks[100 if level >= 100 else 1]`.
- Applied cumulative EXP clamping in both `_apply_exp_gain` and `set_player_state`.
- Retained full compatibility with existing 33 unit tests and 22 E2E tests.

## Artifact Index
- `DISPATCH.md` — Orchestrator dispatch assignment log
- `BRIEFING.md` — Persistent awareness briefing
- `progress.md` — Liveness and task completion tracking
- `proposed_level_progression_service.py` — Formulated drop-in replacement
- `patch_level_progression_service.patch` — Unified diff patch
- `verify_fixes.py` — Standalone validation runner
- `test_proposed_cases.py` — Unit test cases for new behaviors
- `run_unit_tests.py` — Regression unit test runner
- `run_e2e_tests.py` — Regression E2E test runner
- `report.md` — In-depth technical report
- `handoff.md` — Formal 5-component handoff report