Skill: Grafana HA History

Purpose

Look up past Home Assistant entity state from Grafana → InfluxDB (uid: homeassistant). Live/current state stays on the HA MCP.

When to Use

• "Was the garage open at 2am?"
• "When did the front door unlock last night?"
• "What was outdoor temp over the last 24h?"
• Any historical entity state / change timeline / numeric series

Not for current state — use HA MCP GetLiveContext (or equivalent) first.

Workflow

1. Resolve the entity — domain + object_id from the HA entity_id (lock.back_door → domain lock, object_id back_door).

2. Route the question

   • On/off, modes, locked/unlocked, open/closed, person home/away → measurement "state"
   • Continuous numbers (temp, power, humidity, …) → unit-named measurement ("°F", "W", "%", …)

3. Pick a recipe in reference.md:

   • Point-in-time (last value before T)
   • Window changes (ordered events between T1 and T2)
   • Numeric series (raw or downsampled)

4. Query via Grafana MCP grafana_api_request:

   GET /api/datasources/proxy/uid/homeassistant/query?db=homeassistant&q=<URL-encoded InfluxQL>
   

5. Answer with timestamps + values. Cite the InfluxQL used. Cap results with LIMIT / a tight time window.

6. Empty result → verify domain / entity_id tags (and measurement for numerics) before claiming there is no history. See traps in reference.md.

Hard rules

• Read-only. Do not write to Influx or mutate Grafana.
• Always URL-encode the q parameter.
• Influx tag entity_id is the object_id only (no domain prefix).
• Prefer "state" + "value" fields on the "state" measurement for non-numeric entities.
• Never invent measurement names — discover with SHOW MEASUREMENTS / SHOW MEASUREMENTS WHERE "entity_id" = '…' when unsure.

Additional resources

• Schema, recipes, discovery queries, traps: reference.md