# BRIEFING — 2026-10-02T03:04:00Z

## Mission
Implement Milestone 4: Safe Teleportation & PoE2 Hideout Town Portal Engine with Anti-Exploit Quarantine for FreeExile.

## 🔒 My Identity
- Archetype: teamwork_preview_worker
- Roles: implementer, qa, specialist
- Working directory: c:\Projects\FreeExile\.agents\teamwork\worker_m4
- Original parent: 914399d4-059b-422e-a9e6-44e1005de38a
- Milestone: Milestone 4

## 🔒 Key Constraints
- Exclusive write ownership: `server/world/town_portal_types.py`, `server/world/town_portal_engine.py`, `server/world/teleport_service.py`, `tests/unit/test_teleport_and_portal.py`.
- No cheating: Genuine implementations only, real state and behavior.
- Python 3.11+ strict typing, dataclasses with `slots=True, frozen=True` where appropriate, soft cap <= 350 lines, hard cap <= 500 lines per file.
- Verify against existing and new tests.

## Current Parent
- Conversation ID: 914399d4-059b-422e-a9e6-44e1005de38a
- Updated: 2026-10-02T03:04:00Z

## Task Summary
- **What to build**:
  - `server/world/town_portal_types.py`: Enums (`TeleportChannelStatus`, `PortalQuarantineStatus`, `TargetType`, `InterruptReason`), dataclasses (`TownPortalLink`, `TeleportChannelSession`), property aliases and dictionary index compatibility.
  - `server/world/teleport_service.py`: 3.5s authoritative channeling state machine, movement/damage interruption hooks, 5-gate destination validation, spiral ray coordinate resolution.
  - `server/world/town_portal_engine.py`: 2-way `TownPortalLink`, personal exclusivity, party traversal, 6-portal map device tracking, anti-exploit quarantine (boss fight, secret chamber), death penalty handling.
  - `tests/unit/test_teleport_and_portal.py`: Comprehensive unit tests.
- **Success criteria**: All unit and e2e tests pass, hygiene check passes, clean handoff report.
- **Interface contracts**: PROJECT.md, TEST_READY.md, tests in `tests/e2e_social_party/`

## Key Decisions Made
- `TownPortalLink` and `TeleportChannelSession` implemented with `slots=True, frozen=True` while providing `__getitem__` and `__setitem__` to support dict-style access and mutations from tests/callers seamlessly.
- Used a per-instance monotonic counter appended to `portal_id` and `channel_id` to guarantee uniqueness even during rapid sub-millisecond automated calls.
- Enforced 5-gate destination validation both pre-flight (channel start) and post-flight (channel complete).
- Implemented spiral ray safe landing coordinate search at 2.0m, 2.5m, and 3.0m radii across 8 directional angles avoiding collisions.

## Artifact Index
- `.agents/teamwork/worker_m4/DISPATCH.md` — Dispatch log
- `.agents/teamwork/worker_m4/BRIEFING.md` — Working memory
- `.agents/teamwork/worker_m4/progress.md` — Liveness and progress tracker
- `.agents/teamwork/worker_m4/handoff.md` — Final handoff report
- `server/world/town_portal_types.py` — Domain models, enums, DTOs (243 lines)
- `server/world/teleport_service.py` — Safe teleportation channeling & 5-gate engine (227 lines)
- `server/world/town_portal_engine.py` — PoE2 town portal & quarantine engine (182 lines)
- `tests/unit/test_teleport_and_portal.py` — Comprehensive unit test suite (318 lines)

## Change Tracker
- **Files modified**:
  - `server/world/town_portal_types.py`: Created (243 lines)
  - `server/world/teleport_service.py`: Created (227 lines)
  - `server/world/town_portal_engine.py`: Created (182 lines)
  - `tests/unit/test_teleport_and_portal.py`: Created (318 lines)
- **Build status**: PASS (122/122 tests passing: 16 unit + 106 e2e)
- **Pending issues**: None

## Quality Status
- **Build/test result**: 100% PASS
  - `pytest tests/unit/test_teleport_and_portal.py -v`: 16 passed
  - `pytest tests/e2e_social_party/ -v`: 106 passed
- **Lint status**: Clean PASS (0 hard cap violations across all newly authored files)
- **Tests added/modified**: 16 comprehensive unit tests in `tests/unit/test_teleport_and_portal.py`

## Loaded Skills
- None