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+# NEO-64 — Implementation plan
+
+## Story reference
+
+| Field | Value |
+|--------|--------|
+| **Key** | NEO-64 |
+| **Title** | E3.M1: resource_gathered / gather_node_depleted telemetry hook sites |
+| **Linear** | https://linear.app/neon-sprawl/issue/NEO-64/e3m1-resource-gathered-gather-node-depleted-telemetry-hook-sites |
+| **Module** | [E3.M1 — ResourceNodeAndGatherLoop](../decomposition/modules/E3_M1_ResourceNodeAndGatherLoop.md) · Epic 3 Slice 2 · backlog **E3M1-08** |
+| **Branch** | `NEO-64-e3m1-resource-gathered-gather-node-depleted-telemetry-hooks` |
+| **Blocked by** | [NEO-62](https://linear.app/neon-sprawl/issue/NEO-62) — `GatherOperations` + `GatherResult` (**Done** on `main`); [NEO-63](https://linear.app/neon-sprawl/issue/NEO-63) — interact gather wiring (**Done** on `main`). |
+| **Pattern** | [NEO-49](https://linear.app/neon-sprawl/issue/NEO-49) / [NEO-56](https://linear.app/neon-sprawl/issue/NEO-56) — comment-only engine anchors; [NEO-30](https://linear.app/neon-sprawl/issue/NEO-30) — event name + `TODO(E9.M1)` |
+
+## Kickoff clarifications
+
+| Topic | Question | Agent recommendation | Answer |
+|--------|----------|----------------------|--------|
+| **Runtime behavior** | Comments-only vs dev `ILogger`? | **Comments-only** — `TODO(E9.M1)`; no production logging (NEO-49/56 precedent). | **Adopted** (repo precedent; not asked). |
+| **Hook anchor** | Engine only vs engine + `InteractionApi`? | **Engine only** in **`GatherOperations.TryGather`** — HTTP calls engine; no duplicate API-layer hooks (NEO-56 precedent). | **Adopted** (repo precedent; not asked). |
+| **`gather_node_depleted` timing** | Success transition vs also pre-gather deny? | **Success transition only** — hook when a successful gather drives **`remainingGathers`** to **0** after depletion commit; not on pre-gather **`node_depleted`** deny. | **User:** success transition only. |
+| **Manual QA doc** | `docs/manual-qa/NEO-64.md`? | **Yes** — NEO-49/56 verification pattern (comments + no behavior change). | **Adopted** (repo convention). |
+
+## Goal, scope, and out-of-scope
+
+**Goal:** Document and place **comment-only hook sites** on the server-authoritative gather path for future E9.M1 catalog events **`resource_gathered`** and **`gather_node_depleted`**. Align with Epic 3 Slice 2 telemetry vocabulary ([epic_03 — Slice 2](../decomposition/epics/epic_03_crafting_economy.md#epic-3-slice-2)).
+
+**In scope (from Linear + [E3M1-08](E3M1-prototype-backlog.md#e3m1-08--resource_gathered--gather_node_depleted-telemetry-hook-sites)):**
+
+- Hook placement in **`GatherOperations.TryGather`** with **`TODO(E9.M1)`** comments.
+- **`server/README.md`** gather subsection + [E3_M1 module](../decomposition/modules/E3_M1_ResourceNodeAndGatherLoop.md) hook note.
+- **`docs/manual-qa/NEO-64.md`** — verify comments + no behavior/API change.
+- E3M1 backlog + alignment register updates when implementation completes.
+
+**Out of scope (from Linear):**
+
+- Telemetry ingest, dashboards (**E9.M1**).
+- `ILogger` / metrics / dev-only log lines.
+- Duplicate hook comments in **`InteractionApi`** (NEO-56 engine-only precedent).
+- **`gather_node_depleted`** on pre-gather depletion deny or interact deny passthrough (kickoff decision).
+
+## Acceptance criteria checklist
+
+- [ ] Hook sites documented in code and `server/README.md`.
+- [ ] Matches Epic 3 Slice 2 telemetry vocabulary (`resource_gathered`, `gather_node_depleted`).
+
+## Technical approach
+
+1. **Authoritative surface:** **`GatherOperations.TryGather`** — all gather side effects (inventory → XP → depletion) funnel here; **`InteractionApi`** delegates **`resource_node`** interact without duplicating hooks.
+
+2. **Hook site A — `resource_gathered`:** Immediately before the successful **`GatherResult`** return (after depletion commit succeeds):
+   - Comment block names future E9.M1 event **`resource_gathered`**.
+   - **`TODO(E9.M1): catalog emit`** (NEO-49 / NEO-56 style).
+   - Planned payload fields: `playerId`, `interactableId` (node instance key), `itemId`, `quantity` (from **`GatherGrantApplied`**), `skillId` + `xpAmount` + `sourceKind` (from **`GatherXpGrantSummary`**), `remainingGathers` after commit.
+
+3. **Hook site B — `gather_node_depleted`:** On the same success path, when **`depletionOutcome.Snapshot.RemainingGathers == 0`** (node exhausted by this gather):
+   - Comment block names future E9.M1 event **`gather_node_depleted`**.
+   - **`TODO(E9.M1): catalog emit`** — emit **once** when capacity transitions to zero via successful gather (not on pre-gather **`node_depleted`** deny).
+   - Planned payload fields: `interactableId`, optional `playerId` (last gatherer), `maxGathers` from definition if needed at E9.M1 wiring time.
+
+4. **Cross-references (minimal):**
+   - Update **`GatherResult.cs`** xml summary → hook sites in **`TryGather`**.
+   - **`GatherOperations`** class summary → NEO-64 telemetry hook anchor.
+   - **`server/README.md`:** new **NEO-64 telemetry hooks** subsection under gather engine (after NEO-62 block).
+   - **`E3_M1_ResourceNodeAndGatherLoop.md`:** NEO-64 landed line when complete.
+   - **`documentation_and_implementation_alignment.md`** + **`module_dependency_register.md`:** E3.M1 row — E3M1-08 complete; module **Ready** when all Slice 2 backlog lands.
+   - **`E3M1-prototype-backlog.md`:** E3M1-08 checkboxes + landed note.
+
+5. **NEO-56 interaction:** Successful gather already triggers **`item_created`** inside **`PlayerInventoryOperations.TryAddStack`**; **`resource_gathered`** is the gather-funnel catalog event at the orchestration layer (analogous to cast accept vs ability-specific events).
+
+## Files to add
+
+| Path | Purpose |
+|------|---------|
+| `docs/manual-qa/NEO-64.md` | Manual QA: verify comment blocks + no behavior/API change. |
+| `docs/plans/NEO-64-implementation-plan.md` | This plan. |
+
+## Files to modify
+
+| Path | Rationale |
+|------|-----------|
+| `server/NeonSprawl.Server/Game/Gathering/GatherOperations.cs` | **NEO-64:** comment-only **`resource_gathered`** + **`gather_node_depleted`** hook sites on success path. |
+| `server/NeonSprawl.Server/Game/Gathering/GatherResult.cs` | Cross-reference hook anchor in type summary (no behavior change). |
+| `server/README.md` | Document gather telemetry hook placement (NEO-64). |
+| `docs/decomposition/modules/E3_M1_ResourceNodeAndGatherLoop.md` | Implementation snapshot: NEO-64 telemetry hooks landed. |
+| `docs/decomposition/modules/documentation_and_implementation_alignment.md` | E3.M1 row: NEO-64 hook sites. |
+| `docs/decomposition/modules/module_dependency_register.md` | E3.M1 note — E3M1-08 complete; module status **Ready**. |
+| `docs/plans/E3M1-prototype-backlog.md` | E3M1-08 checkboxes + landed note. |
+
+## Tests
+
+| Test file | What it covers |
+|-----------|----------------|
+| *(none added or changed)* | Comments-only change; no behavior or wire contract change. Regression: `dotnet test NeonSprawl.sln` (existing **`GatherOperationsTests`** + **`InteractionResourceNodeGatherIntegrationTests`** unchanged). Manual verification: **`docs/manual-qa/NEO-64.md`**. |
+
+## Open questions / risks
+
+| Question / risk | Agent recommendation | Status |
+|-----------------|----------------------|--------|
+| **Overlap with NEO-56 `item_created`** | Keep both — **`item_created`** at inventory layer; **`resource_gathered`** at gather orchestration (E9.M1 can correlate or sample). | **adopted** |
+| **Pre-gather depletion deny telemetry** | No **`gather_node_depleted`** hook on deny; interact **`node_depleted`** **`reasonCode`** suffices until E9.M1 defines a separate deny funnel event. | **adopted** (kickoff) |
+
+None blocking.