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+```mermaid
+sequenceDiagram
+    participant UI as 🧩 +layout.svelte
+    participant serverStore as 🗄️ serverStore
+    participant PropsSvc as ⚙️ PropsService
+    participant API as 🌐 llama-server
+
+    Note over serverStore: State:<br/>props: ApiLlamaCppServerProps | null<br/>loading, error<br/>role: ServerRole | null (MODEL | ROUTER)<br/>fetchPromise (deduplication)
+
+    %% ═══════════════════════════════════════════════════════════════════════════
+    Note over UI,API: 🚀 INITIALIZATION
+    %% ═══════════════════════════════════════════════════════════════════════════
+
+    UI->>serverStore: fetch()
+    activate serverStore
+
+    alt fetchPromise exists (already fetching)
+        serverStore-->>UI: return fetchPromise
+        Note right of serverStore: Deduplicate concurrent calls
+    end
+
+    serverStore->>serverStore: loading = true
+    serverStore->>serverStore: fetchPromise = new Promise()
+
+    serverStore->>PropsSvc: fetch()
+    PropsSvc->>API: GET /props
+    API-->>PropsSvc: ApiLlamaCppServerProps
+    Note right of API: {role, model_path, model_alias,<br/>modalities, default_generation_settings, ...}
+
+    PropsSvc-->>serverStore: props
+    serverStore->>serverStore: props = $state(data)
+
+    serverStore->>serverStore: detectRole(props)
+    Note right of serverStore: role = props.role === "router"<br/>  ? ServerRole.ROUTER<br/>  : ServerRole.MODEL
+
+    serverStore->>serverStore: loading = false
+    serverStore->>serverStore: fetchPromise = null
+    deactivate serverStore
+
+    %% ═══════════════════════════════════════════════════════════════════════════
+    Note over UI,API: 📊 COMPUTED GETTERS
+    %% ═══════════════════════════════════════════════════════════════════════════
+
+    Note over serverStore: Getters from props:
+
+    rect rgb(240, 255, 240)
+        Note over serverStore: defaultParams<br/>→ props.default_generation_settings.params<br/>(temperature, top_p, top_k, etc.)
+    end
+
+    rect rgb(240, 255, 240)
+        Note over serverStore: contextSize<br/>→ props.default_generation_settings.n_ctx
+    end
+
+    rect rgb(255, 240, 240)
+        Note over serverStore: isRouterMode<br/>→ role === ServerRole.ROUTER
+    end
+
+    rect rgb(255, 240, 240)
+        Note over serverStore: isModelMode<br/>→ role === ServerRole.MODEL
+    end
+
+    %% ═══════════════════════════════════════════════════════════════════════════
+    Note over UI,API: 🔗 RELATIONSHIPS
+    %% ═══════════════════════════════════════════════════════════════════════════
+
+    Note over serverStore: Used by:
+    Note right of serverStore: - modelsStore: role detection, MODEL mode modalities<br/>- settingsStore: syncWithServerDefaults (defaultParams)<br/>- chatStore: contextSize for processing state<br/>- UI components: isRouterMode for conditional rendering
+
+    %% ═══════════════════════════════════════════════════════════════════════════
+    Note over UI,API: ❌ ERROR HANDLING
+    %% ═══════════════════════════════════════════════════════════════════════════
+
+    Note over serverStore: getErrorMessage(): string | null<br/>Returns formatted error for UI display
+
+    Note over serverStore: clear(): void<br/>Resets all state (props, error, loading, role)
+```