# NimmerSky Architecture Research

Research findings from 2026-03-18 session exploring the Skyrim AI landscape and nimmerverse integration opportunities.

---

## The Three-System Landscape

| System | Strength | Weakness | Architecture |
|--------|----------|----------|--------------|
| **Mantella** | Established, stable, wide adoption | Older architecture | External Python server |
| **CHIM** | Oghma Infinium RAG, knowledge gating | Windows/WSL2 dependency | Dwemer Distro (Debian VM) |
| **SkyrimNet** | Native SKSE, action system, OmniSight | No lore RAG, context bleed | C++ DLL + Inja templates |

**Our approach**: Harvest the best from each — SkyrimNet's game integration, CHIM's lore database, nimmerverse's memory substrate.

---

## SkyrimNet Context Bleed Analysis

### Source Location
```
/home/dafit/Downloads/SkyrimNet-beta17.1/SKSE/Plugins/SkyrimNet/prompts/
```

### The Problem
NPCs omnisciently know the player's name and events they didn't witness.

### Root Cause
The `player` object is **globally available** to all NPC prompts without knowledge gating.

**Key files with leakage:**

| File | Line | Issue |
|------|------|-------|
| `submodules/character_bio/0600_relationships.prompt` | 7 | `Travel History with {{ player.name }}` |
| `submodules/character_bio/0010_header.prompt` | 8, 22, 24, 28, 30 | `{{ player.name }}` / `{{ decnpc(player.UUID).name }}` |
| `components/context/scene_context.prompt` | Various | Player references in nearby actor descriptions |

### Event History (Partial Isolation)
```inja
{% set _event_filter = append(_event_filter, npc.UUID) %}
{% set events = get_recent_events(_event_count, _event_filter) %}
```
Events ARE filtered by NPC UUID — but the implementation of `get_recent_events` is in C++ (SkyrimNet.dll), unclear if it's truly per-NPC witnessed events.

### Potential Fixes

**Level 1 - Template Hack:**
```inja
{% if has_memory_tag(npc.UUID, "met_player") %}
    {% set known_player_name = player.name %}
{% else %}
    {% set known_player_name = "the stranger" %}
{% endif %}
```

**Level 2 - Memory Check:**
Add C++ decorator `npc_knows_player_name(uuid)` that queries memory system.

**Level 3 - Nimmerverse Substrate:**
Route all "what does NPC X know about Y" through external memory service.

---

## Oghma Infinium (CHIM's RAG System)

### What It Is
1900+ tagged entries of Tamrielic lore with knowledge class filtering.

### Source
**Google Sheets (Open/Downloadable):**
https://docs.google.com/spreadsheets/d/1dcfctU-iOqprwy2BOc7___4Awteczgdlv8886KalPsQ/

### Knowledge Class Taxonomy

| Category | Examples | Purpose |
|----------|----------|---------|
| **Racial** | `nord`, `argonian`, `khajiit`, `darkelf`, `redguard` | Cultural knowledge |
| **Profession** | `blacksmith`, `scholar`, `mage`, `alchemist`, `merchant` | Trade knowledge |
| **Location** | `whiterun`, `rift`, `eastmarch`, `haafingar`, `solstheim` | Geographic knowledge |
| **Faction** | `thieves_guild`, `companions`, `dark_brotherhood`, `college` | Organizational secrets |
| **Special** | `charactername`, `knowall` | Edge cases |

### Content Sheets
- Knowledge Classes Reference (taxonomy)
- Vanilla NPCs (NPC → class mappings)
- Visual Descriptions
- Dynamic Oghma
- Groups/Lore/Books
- Figures/Gods
- Artifacts, Armor/Weapons, Items, Spells, Creatures
- Location sheets (one per Hold)

### Multi-Tag Intersection
NPCs receive lore from **overlapping domains**:
- Whiterun blacksmith: `[blacksmith] ∩ [nord] ∩ [whiterun]`
- Riften fence: `[merchant] ∩ [thieves_guild] ∩ [rift]`

### Embedding System
Uses **Minime-T5** for vector embeddings.

---

## SkyrimNet Memory System

### Documentation
https://goncalo22.github.io/SkyrimNet-GamePlugin/Memory%20System/memory-recall

### Storage Architecture
- **Database**: SQLite with HNSW vector indexing (per-NPC files)
- **Embeddings**: MiniLM-L6-v2 (384-dimensional)
- **Limits**: 1000 memories/NPC, minimum importance 0.2

### Memory Data Structure
```json
{
    "summary": "Brief description",
    "detailed_description": "Full narrative",
    "emotion": "joyful|angry|fearful|sad|neutral|...",
    "importance_score": 0.0-1.0,
    "tags": ["people", "places", "items", "activities"],
    "memory_type": "EXPERIENCE|RELATIONSHIP|KNOWLEDGE|TRAUMA|JOY|...",
    "embedding": [384-dimensional vector]
}
```

### Retrieval Scoring Weights

| Signal | Weight |
|--------|--------|
| Semantic similarity | 0.35 |
| Temporal proximity | 0.20 |
| Actor involvement | 0.20 |
| Emotional match | 0.10 |
| Keyword relevance | 0.10 |
| Location match | 0.05 |

### Memory Formation Triggers
- Conversations
- Combat encounters
- Item transactions
- Proximity to notable actions
- Grouped into segments (60min gap, 10-480min duration, 5-200 events)

---

## Nimmerverse Integration Architecture

### The Vision
SkyrimNet as **game interface**, nimmerverse as **cognitive substrate**.

```
┌─────────────────────────────────────────────────────────────┐
│                    NIMMERVERSE SUBSTRATE                     │
│                                                             │
│  ┌──────────────────┐  ┌──────────────────────────────────┐ │
│  │   phoebe-dev     │  │          iris-dev                │ │
│  │   PostgreSQL     │  │          ChromaDB                │ │
│  │   :35432         │  │          :35000                  │ │
│  │                  │  │                                  │ │
│  │ • NPC relations  │  │ • Oghma Infinium (lore vectors) │ │
│  │ • Knowledge      │  │ • NPC Memories (migrated)       │ │
│  │   classes        │  │ • 384-dim MiniLM embeddings     │ │
│  │ • Event log      │  │                                  │ │
│  │ • Who knows whom │  │                                  │ │
│  └──────────────────┘  └──────────────────────────────────┘ │
│                              │                               │
│                              ▼                               │
│                    ┌─────────────────┐                      │
│                    │   nats-dev      │                      │
│                    │   :30000        │                      │
│                    │                 │                      │
│                    │ • Memory events │                      │
│                    │ • Gossip pubsub │                      │
│                    │ • Real-time     │                      │
│                    └─────────────────┘                      │
└─────────────────────────────────────────────────────────────┘
                              │
                              ▼
                    ┌─────────────────┐
                    │   SkyrimNet     │
                    │                 │
                    │ • Query lore    │
                    │ • Query memory  │
                    │ • Log events    │
                    │ • Get classes   │
                    └─────────────────┘
```

### Migration Path

**Phase 1: Oghma Infinium Import**
1. Download CSV from Google Sheets
2. Load knowledge classes into PostgreSQL
3. Embed lore entries with MiniLM-L6-v2
4. Store in ChromaDB with class metadata

**Phase 2: Memory Migration**
1. Create ChromaDB collection for NPC memories
2. Match SkyrimNet's data structure
3. Replicate scoring weights in retrieval
4. Add NPC UUID to all memories (enables cross-NPC queries)

**Phase 3: Knowledge Gating Service**
1. Build service that answers "What does NPC X know about topic Y?"
2. Combines: Knowledge classes + Lore retrieval + Memory search
3. Expose via MCP or HTTP for SkyrimNet integration

**Phase 4: Gossip Network**
1. NATS pubsub for memory propagation
2. When NPCs interact, memories can spread (with distortion)
3. "Lydia told Farengar about the dragon attack" becomes queryable

### Benefits Over Current Architecture

| Feature | SkyrimNet Native | Nimmerverse Integration |
|---------|-----------------|------------------------|
| Memory storage | Per-NPC SQLite | Unified ChromaDB |
| Cross-NPC queries | Not possible | "Who witnessed X?" |
| Lore grounding | LLM training only | Oghma Infinium RAG |
| Knowledge isolation | Global `player` leaks | Per-NPC class filtering |
| Gossip propagation | None | NATS-based network |
| Infrastructure | Windows-compatible | Linux native |

---

## Key Resources

### SkyrimNet
- Source: `/home/dafit/Downloads/SkyrimNet-beta17.1/`
- Prompts: `SKSE/Plugins/SkyrimNet/prompts/`
- Memory docs: https://goncalo22.github.io/SkyrimNet-GamePlugin/Memory%20System/memory-recall
- Conversations docs: https://goncalo22.github.io/SkyrimNet-GamePlugin/conversations

### CHIM / Oghma Infinium
- Nexus: https://www.nexusmods.com/skyrimspecialedition/mods/126330
- Wiki: https://dwemerdynamics.hostwiki.io/
- Oghma CSV: https://docs.google.com/spreadsheets/d/1dcfctU-iOqprwy2BOc7___4Awteczgdlv8886KalPsQ/

### Mantella
- Nexus: https://www.nexusmods.com/skyrimspecialedition/mods/98631

### Current Modlist
- **Decision**: Tested Schtevie's Requiem Full Content Extension — returning to own foundation
- Our stack: SkyrimNet + custom nimmerverse integration

---

## Next Steps

- [x] Test Schtevie's modlist stability ✓ (2026-03-18: tested, returning to own foundation)
- [ ] Export Oghma Infinium CSV sheets
- [ ] Design PostgreSQL schema for knowledge classes
- [ ] Prototype ChromaDB lore collection
- [ ] Map SkyrimNet template injection points for external queries
- [ ] Design MCP/HTTP interface for lore service

---

**Version:** 1.0 | **Created:** 2026-03-18