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# NEO-98 — Implementation plan
## Story reference
| Field | Value |
|--------|--------|
| **Key** | NEO-98 |
| **Title** | E5M2-12: Playable NPC telegraph combat capstone (Godot) |
| **Linear** | https://linear.app/neon-sprawl/issue/NEO-98/e5m2-12-playable-npc-telegraph-combat-capstone-godot |
| **Module** | [E5.M2 — NpcAiAndBehaviorProfiles](../decomposition/modules/E5_M2_NpcAiAndBehaviorProfiles.md) · Epic 5 Slice 2 · backlog **E5M2-12** |
| **Branch** | `NEO-98-e5m2-12-playable-npc-telegraph-combat-capstone` |
| **Server deps** | [NEO-92](https://linear.app/neon-sprawl/issue/NEO-92) aggro + leash (**Done**); [NEO-93](https://linear.app/neon-sprawl/issue/NEO-93) runtime state machine (**Done**); [NEO-94](https://linear.app/neon-sprawl/issue/NEO-94) runtime snapshot GET (**Done**); [NEO-95](https://linear.app/neon-sprawl/issue/NEO-95) NPC attack resolve + player combat HP (**Done**) |
| **Client deps** | [NEO-97](https://linear.app/neon-sprawl/issue/NEO-97) telegraph HUD + archetype markers (**Done**); E5.M1 cast + combat-target HUD ([NEO-85](https://linear.app/neon-sprawl/issue/NEO-85), [NEO-86](https://linear.app/neon-sprawl/issue/NEO-86)) (**Done**) |
| **Pattern** | Capstone integration — [NEO-86](https://linear.app/neon-sprawl/issue/NEO-86) docs + manual QA primary; minimal client gap-fill only if capstone QA fails on `main` |
| **Server counterpart** | NEO-92–NEO-95 server spine; Bruno-only verification is not prototype-complete per [full-stack epic decomposition](../../.cursor/rules/full-stack-epic-decomposition.md) |
## Kickoff clarifications
| Topic | Question | Agent recommendation | Answer |
|--------|----------|----------------------|--------|
| **Implementation scope** | Docs-only vs client code? | **Docs + manual QA primary**; fix integration gaps only if capstone QA fails on `main` — [NEO-86](NEO-86-implementation-plan.md) precedent. | **User:** docs-primary; client fixes only if QA fails. |
| **Session baseline** | Fresh server vs fixture POST? | **Fresh server restart** before Godot **F5** — resets NPC HP, aggro/runtime rows, and player combat HP (NEO-86 / NEO-97 precedent); zero Bruno/curl in main checklist. | **User:** fresh restart; no Bruno/curl in checklist. |
| **Archetype order** | Order in single-session script? | **Melee → Ranged → Elite** — matches E5M2-12 backlog goal prose (“aggro a melee NPC… defeat all three archetypes”). | **User:** melee → ranged → elite. |
| **Verification depth** | Full telegraph spine per archetype? | **Full telegraph + player HP on Melee**; Ranged + Elite **defeat + telegraph visible** with documented windup/cooldown — keeps one-session script tractable while satisfying Slice 2 AC. | **User:** melee full; ranged/elite light. |
| **NEO-97 relationship** | Supersede component QA? | **NEO-98 supersedes as capstone**; keep [NEO-97](../manual-qa/NEO-97.md) as component-level regression reference (NEO-85 / NEO-86 pattern). | **Adopted** (repo precedent; not asked). |
## Goal, scope, and out-of-scope
**Goal:** Prove Epic 5 Slice 2 acceptance **in Godot**: aggro a melee NPC, observe readable telegraph timing before damage, take incoming NPC damage, defeat all three archetypes — without Bruno.
**In scope (from Linear + [E5M2-12](E5M2-prototype-backlog.md#e5m2-12--playable-npc-telegraph-combat-capstone-godot)):**
- **`docs/manual-qa/NEO-98.md`**: numbered **single-session** capstone script — fresh dev player, **Melee → Ranged → Elite**, zero Bruno/curl steps in the main checklist.
- **`client/README.md`**: **End-to-end NPC telegraph combat loop** section — integration checklist (boot → lock → cast → telegraph → player HP → defeat ×3); cross-links NEO-92–NEO-97.
- **Module alignment** (on story completion): update [`documentation_and_implementation_alignment.md`](../decomposition/modules/documentation_and_implementation_alignment.md) E5.M2 row + E5M2-12 backlog checkboxes; note Epic 5 Slice 2 client capstone complete.
- **Integration fixes only if capstone QA fails** on current `main` wiring (unexpected deny, HUD refresh gap, poll gate, etc.).
**Out of scope (from Linear + backlog):**
- Encounters/loot ([E5.M3](../decomposition/modules/E5_M3_EncounterAndRewardTables.md)), spawn ecology ([E4.M2](../decomposition/modules/E4_M2_SpawnEcologyController.md)).
- Final VFX art, dodge mechanics, player death flow.
- Bruno-only verification as prototype-complete proof.
- New server APIs or behavior catalog changes.
## Acceptance criteria checklist
- [x] Human completes **`docs/manual-qa/NEO-98.md`** with server + client; telegraph timing readable before damage on the melee spine.
- [x] Epic 5 Slice 2 AC: telegraph timing matches UI feedback; aggro rules feel deterministic in manual QA.
- [x] All three archetypes defeated in one session; **`CombatTargetHpLabel`** shows defeated for each.
- [x] Re-read [epic_05 Definition of Done](../decomposition/epics/epic_05_pve_combat.md#definition-of-done) for prototype minimums.
## Implementation reconciliation (shipped)
- **`docs/manual-qa/NEO-98.md`** — single-session capstone (Melee full telegraph spine → Ranged/Elite defeat + telegraph visible); zero Bruno/curl in main checklist.
- **`client/README.md`** — **End-to-end NPC telegraph combat loop (NEO-98)** section with flow table and cross-links.
- **`docs/plans/E5M2-prototype-backlog.md`**, **`E5_M2_NpcAiAndBehaviorProfiles.md`**, **`documentation_and_implementation_alignment.md`** — E5M2-12 landed; E5.M2 **Ready**; Epic 5 Slice 2 client capstone complete.
- **Integration fix (capstone QA):** defeated NPCs continued attacking — **`NpcRuntimeOperations.TryStopOnTargetDefeat`** on cast accept + **`AdvanceOne`** defeated guard; server tests added.
## Technical approach
### 1. Capstone manual QA script (`docs/manual-qa/NEO-98.md`)
**Preconditions:** Stop any running server; start fresh (`dotnet run`) so in-memory **`dev-local-1`** NPC HP, aggro/runtime rows, and player combat HP reset. Godot **F5** with **no** prior curl/Bruno seeding (hotbar **`prototype_pulse`** bind is automatic — NEO-85 dev bootstrap).
**Frozen catalog math** (from [E5_M2 freeze box](../decomposition/modules/E5_M2_NpcAiAndBehaviorProfiles.md#prototype-slice-2-freeze-e5m2-01); player casts **`prototype_pulse`** **25** dmg, ~**3 s** cooldown):
| Archetype | Instance id | Marker | maxHp | Casts to defeat | attackDamage | windup | cooldown |
|-----------|-------------|--------|-------|-----------------|--------------|--------|----------|
| Melee | `prototype_npc_melee` | orange west **`(-3, -3)`** | 100 | **4** | 15 | 1.5 s | 3.0 s |
| Ranged | `prototype_npc_ranged` | purple SE **`(3, 3)`** | 80 | **4** | 12 | 2.0 s | 4.0 s |
| Elite | `prototype_npc_elite` | gold origin **`(0, 0)`** | 200 | **8** | 25 | 2.5 s | 5.0 s |
**Melee full spine (telegraph + player HP):**
1. Walk to **Melee** marker; **Tab** lock **`prototype_npc_melee`** — **`Validity: ok`**.
2. Press **1** (damaging cast): **`NpcStateLabel`** → **`aggro`** (~1 Hz poll); **`PlayerCombatHpLabel`** → **`100/100`**.
3. Wait **≥ 4.5 s** from first cast (3.0 s cooldown + 1.5 s windup): **`NpcStateLabel`** → **`telegraph_windup`**; **`TelegraphLabel`** shows countdown (**`Telegraph: Melee … · ~1.x s (melee)`**) ticking between polls.
4. After windup completes: **`PlayerCombatHpLabel`** → **`85/100`** (15 damage).
5. Press **1** three more times (respect cooldown) until **`CombatTargetHpLabel`** → **`0/100 (defeated)`** and cast feedback shows defeat.
**Ranged light (defeat + telegraph visible):**
6. Walk to **Ranged** marker; lock **`prototype_npc_ranged`**.
7. First damaging cast → aggro; wait for **`telegraph_windup`** + readable **`TelegraphLabel`** (2.0 s windup after 4.0 s cooldown from first cast).
8. Cast until defeated (**4** pulses); verify deny on re-cast (**`target_defeated`**).
**Elite light (defeat + telegraph visible):**
9. Walk to **Elite** marker; lock **`prototype_npc_elite`**.
10. First damaging cast → aggro; wait for **`telegraph_windup`** + readable **`TelegraphLabel`** (2.5 s windup after 5.0 s cooldown).
11. Cast until defeated (**8** pulses); verify deny on re-cast.
**Regression spot-checks (end of session):**
- Cast without lock → **`ability_cast_denied: invalid_target`** (NEO-28).
- **`CombatTargetHpLabel`** + cooldown HUD still work (NEO-85 / NEO-32).
- Optional deeper telegraph/HP checks: [NEO-97 manual QA](../manual-qa/NEO-97.md) (elite incoming-threat row).
**Notes section (not main checklist steps):**
- Optional mid-session reset (Development host): `POST /game/__dev/combat-targets-fixture` — see [NEO-97](../manual-qa/NEO-97.md) / [server README — dev fixture](../../../server/README.md#dev-combat-target-fixture-brunomanual-qa).
- Capstone baseline prefers **server restart** over fixture POST.
### 2. README integration checklist
New **`## End-to-end NPC telegraph combat loop (NEO-98)`** section after [NEO-97 NPC runtime + telegraph HUD](NEO-97-implementation-plan.md) subsection in `client/README.md`:
- Flow in prose: fresh server → boot hotbar sync → **Melee** lock → cast → telegraph HUD → player HP drop → defeat → repeat **Ranged** + **Elite**.
- Table mirroring capstone steps (lock, telegraph labels, defeat cast counts).
- Cross-links: NEO-92 (aggro), NEO-94 (runtime snapshot), NEO-95 (player combat HP), NEO-97 (HUD poll clients).
- Pointer to **`docs/manual-qa/NEO-98.md`** as authoritative capstone script.
- Note NEO-97 manual QA as component-level regression.
### 3. Module alignment (implementation batch or story end)
When acceptance criteria pass:
- **`documentation_and_implementation_alignment.md`**: E5.M2 — note **NEO-98 landed**, Epic 5 Slice 2 client capstone complete.
- **`E5M2-prototype-backlog.md`**: E5M2-12 acceptance checkboxes + landed note.
- **`E5_M2_NpcAiAndBehaviorProfiles.md`**: E5M2-12 row + capstone cross-link if not already marked.
### 4. Integration fixes (conditional)
Run capstone dry-run on **`main`** before doc-only work; if any step fails, fix minimal client bug in this branch and note in plan **Decisions**. Expected path: docs + README only (NEO-97 HUD wiring landed in PR #136).
## Files to add
| Path | Purpose |
|------|---------|
| `docs/plans/NEO-98-implementation-plan.md` | This plan. |
| `docs/manual-qa/NEO-98.md` | Capstone single-session manual QA (zero Bruno/curl in main checklist). |
## Files to modify
| Path | Rationale |
|------|-----------|
| `client/README.md` | End-to-end NPC telegraph combat loop section; capstone manual QA link; cross-links NEO-92–NEO-97. |
| `docs/decomposition/modules/documentation_and_implementation_alignment.md` | E5.M2 row — NEO-98 landed + Slice 2 client capstone complete (on story completion). |
| `docs/plans/E5M2-prototype-backlog.md` | E5M2-12 acceptance checkboxes + landed note (on story completion). |
| `docs/decomposition/modules/E5_M2_NpcAiAndBehaviorProfiles.md` | E5M2-12 capstone landed note + manual QA link (on story completion). |
| `server/NeonSprawl.Server/Game/Npc/NpcRuntimeOperations.cs` | **`TryStopOnTargetDefeat`** + defeated guard in **`AdvanceOne`**; **`AdvanceAll`** takes **`ICombatEntityHealthStore`**. |
| `server/NeonSprawl.Server/Game/Npc/NpcRuntimeSnapshotWorldApi.cs` | Pass combat health store into **`AdvanceAll`**. |
| `server/NeonSprawl.Server/Game/AbilityInput/AbilityCastApi.cs` | Stop NPC combat on **`TargetDefeated`**. |
| `server/README.md` | Threat table — **Defeat clear** rule. |
**Conditional (only if capstone QA fails on client):**
| Path | Rationale |
|------|-----------|
| `client/scripts/main.gd` | Minimal HUD / poll / sync fix for failing capstone step. |
| Other client scripts under `client/scripts/` | Only if root cause is outside `main.gd` (document in plan **Decisions**). |
## Tests
| Path | Change |
|------|--------|
| `server/NeonSprawl.Server.Tests/Game/Npc/NpcRuntimeOperationsTests.cs` | **`TryStopOnTargetDefeat`** + defeated **`AdvanceAll`** guard tests. |
| `server/NeonSprawl.Server.Tests/Game/AbilityInput/AbilityCastApiTests.cs` | **`PostAbilityCast_ShouldStopNpcCombat_WhenTargetDefeated`** integration test. |
**If integration fix adds/changes client behavior:** add or extend the smallest GdUnit test in the matching NEO-97 suite (`npc_combat_hud_refresh_test.gd`, etc.) — AAA layout per [testing-expectations.md](../../.cursor/rules/testing-expectations.md).
**Manual verification:** [`docs/manual-qa/NEO-98.md`](../manual-qa/NEO-98.md) — server + Godot; melee telegraph spine + three-archetype defeat without curl.
## Open questions / risks
| Question or risk | Agent recommendation | Status |
|------------------|----------------------|--------|
| **Capstone dry-run on `main`** | Capstone QA found defeated melee still attacking; server fix clears aggro + runtime on defeat. | **adopted** |
| **Session length (elite ×8 casts)** | Document cast counts + cooldown reminders; elite section is defeat + telegraph visibility only (kickoff depth decision). | **adopted** |
| **Player HP drift across three fights** | Script asserts melee **85/100** only; later archetype hits optional in Notes — do not require exact final HP in AC. | **adopted** |
| **Overlap with NEO-97 manual QA** | NEO-98 supersedes as capstone; NEO-97 stays component regression (elite incoming-threat row). | **adopted** |
| **NEO-97 merge dependency** | **NEO-97 merged** to `main` (PR #136) — capstone can proceed. | **adopted** |
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