---
phase: 28-ollama-integration
plan: 03
subsystem: dashboard
tags: [hermes, ollama, stateJson, jsonb, heartbeat, dashboard]

# Dependency graph
requires:
  - phase: 28-01
    provides: ollama.ts service with detectOllama, listOllamaModels, getRecommendedModel

provides:
  - getOllamaMemoryUsage() in ollama.ts — queries /api/ps for active model VRAM usage
  - Hermes stateJson merge in heartbeat.ts updateRuntimeState — stores hermesModel + hermesMemoryBytes after each run
  - HermesRuntimeCard component in AgentDetail.tsx — displays model, native skill count, VRAM in AgentOverview
affects: [28-02, 29-default-provider]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - COALESCE jsonb concat pattern for stateJson merge (no overwrite)
    - Best-effort Ollama /api/ps probe (error caught, returns null gracefully)
    - Native skill count derived from agentsApi.skills in UI (avoids cross-DB query in heartbeat)

key-files:
  created: []
  modified:
    - server/src/services/ollama.ts
    - server/src/services/heartbeat.ts
    - ui/src/pages/AgentDetail.tsx

key-decisions:
  - "hermesNativeSkillCount derived from agentsApi.skills in HermesRuntimeCard (not stored in stateJson) — avoids cross-DB query in heartbeat path"
  - "COALESCE jsonb concat used for stateJson merge — prevents overwriting existing fields from other heartbeat writers"
  - "getOllamaMemoryUsage catches all errors and returns null — Ollama absence or model-not-loaded both show Not loaded"

patterns-established:
  - "Pattern: Use COALESCE(column, '{}'::jsonb) || patch::jsonb for safe jsonb merge in Drizzle"
  - "Pattern: Hermes-specific stateJson written in updateRuntimeState conditional on adapterType === hermes_local"

requirements-completed: [HERM-06, HERM-07]

# Metrics
duration: 12min
completed: 2026-04-01
---

# Phase 28 Plan 03: Hermes Runtime Dashboard Summary

**Hermes heartbeat now persists model name + VRAM via jsonb merge, and AgentOverview renders a HermesRuntimeCard showing model, native skill count, and memory usage.**

## Tasks Completed

| Task | Description | Commit |
|------|-------------|--------|
| 1 | Add getOllamaMemoryUsage + stateJson merge in heartbeat | dbdc62aa |
| 2 | Add HermesRuntimeCard in AgentOverview | 7458753a |

## What Was Built

### Server: getOllamaMemoryUsage (ollama.ts)

New exported function queries Ollama `/api/ps` with a 3-second AbortController timeout. Finds the running model by `name` or `model` field, returns `size_vram` bytes. Returns `null` on any error (graceful degradation per Pitfall 5 from RESEARCH).

### Server: Hermes stateJson Merge (heartbeat.ts)

After the existing `db.update(agentRuntimeState)` cost tracking block in `updateRuntimeState`, a `hermes_local`-gated block merges `hermesModel` and `hermesMemoryBytes` into `stateJson` using Postgres jsonb concat:

```sql
COALESCE(stateJson, '{}'::jsonb) || '{"hermesModel": ..., "hermesMemoryBytes": ...}'::jsonb
```

This never overwrites other fields already stored in stateJson (Pitfall 3 from RESEARCH).

### UI: HermesRuntimeCard (AgentDetail.tsx)

New component defined before `AgentOverview`, rendered inside it gated by `agent.adapterType === "hermes_local" && runtimeState`. Shows:
- **Model**: `stateJson.hermesModel` or "Not set"
- **Native Skills**: count from `agentsApi.skills(agentId).entries` filtered by `originLabel === "Hermes skill"`
- **Memory (VRAM)**: formatted from `stateJson.hermesMemoryBytes` or "Not loaded"

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Plan referenced `adapterEntries` but type has `entries`**
- **Found during:** Task 2
- **Issue:** The plan's action block referenced `skillsData.adapterEntries` but `AgentSkillSnapshot` has `entries: AgentSkillEntry[]`
- **Fix:** Used `skillsData.entries` in the implementation
- **Files modified:** ui/src/pages/AgentDetail.tsx
- **Commit:** 7458753a

**2. [Rule 1 - Bug] Removed unused `createRequire` import from ollama.ts**
- **Found during:** Task 1
- **Issue:** Plan 01 left a `createRequire` import in ollama.ts that was unused
- **Fix:** Removed the unused import when modifying the file
- **Files modified:** server/src/services/ollama.ts
- **Commit:** dbdc62aa

## Known Stubs

None — all data flows are wired (stateJson written by heartbeat, read by HermesRuntimeCard). Model name and memory bytes will be `null`/`undefined` until a Hermes run completes, which is correct behavior (displays "Not set" / "Not loaded").

## HERM-06 Verification (No Code Change)

Cost tracking for Hermes + Ollama runs correctly returns $0.00:
- `result.costUsd` is `undefined` for local Ollama runs
- `normalizeBilledCostCents(undefined, billingType)` returns `0`
- The `if (additionalCostCents > 0 || hasTokenUsage)` guard suppresses cost events when no token data emitted
- This is correct behavior per RESEARCH Pitfall 6

## Self-Check: PASSED

- `/opt/nexus/.claude/worktrees/agent-ad37cce3/server/src/services/ollama.ts` — exists with getOllamaMemoryUsage
- `/opt/nexus/.claude/worktrees/agent-ad37cce3/server/src/services/heartbeat.ts` — exists with hermes_local block
- `/opt/nexus/.claude/worktrees/agent-ad37cce3/ui/src/pages/AgentDetail.tsx` — exists with HermesRuntimeCard
- Commits dbdc62aa, 7458753a — confirmed in git log
