0650eb857a
Own minimal MCP server exposing the live state of the HA instances in
services/home-assistant/instances.yaml to Claude Code over stdio — the
phase-2 "MCP read-only" gate in services/home-assistant/DESIGN.md.
Operator decision 2026-07-30: build our own rather than adopt hass-mcp,
so the tools reuse scripts/ha/lib/{ha_api,ha_ws}.py (one token-handling
story for the whole HA toolchain) and can answer from the repo and from
instances.yaml, which a generic server cannot.
Seven tools, all read-only, default instance `ken`: list_entities,
get_state, get_areas, find_entities_by_description, read_automation,
list_automations, instance_status.
Read-only by construction, not by policy: REST goes through ha_api.Client
(get/get_raw_text only — no POST method exists), WebSocket commands are
checked against a three-entry *_list allowlist before being sent, and
read_automation reads services/home-assistant/config/<instance>/ rather
than /api/config. Tests assert all three, including a grep guard that
fails if requests.post/call_service ever appears in the package. The
write path stays repo + scripts/ha/deploy.sh.
Details that follow from how this instance actually behaves:
- unavailable is never silent — every entity view carries unavailable +
unavailable_since, every list a count. The 2026-07-23 audit traced ~15
silently dead automations to conditions sitting on dead sensors.
- chelsty-ha (status: offline in instances.yaml) is answered from the
file, never dialed — no 5s timeout for a known-offline LTE site.
- areas come from the WS registries (entity area_id > device area_id) with
a storage-export fallback; area_source/area_note say which was used and
what the offline export cannot resolve.
- PL->EN fuzzy matching, since the house is Polish and the entity_ids are
transliterated English: "czujnik temperatury salon" ->
sensor.thsalon_temperature, each hit explaining why it matched.
- 5s timeouts and errors returned as {"error": ...} inside a normal tool
result — a missing token or an unreachable instance never crashes the
server or hangs the agent.
Registered for Claude Code in the repo-root .mcp.json (new file) as `ha`,
via services/ha-mcp/run.sh (prefers the venv, falls back to system
python3). The mcp SDK lives in services/ha-mcp/.venv — rationale for venv
over --break-system-packages is in the README.
Tests: 42 offline (no network, no HA, no token) + a live read-only smoke
against ken — HA 2026.7.2, 1647 entities, 377 unavailable, 115
automations, 13 areas.
112 lines
3.2 KiB
JSON
112 lines
3.2 KiB
JSON
[
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{
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"entity_id": "sensor.thsalon_temperature",
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"state": "24.3",
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"attributes": {
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"friendly_name": "thSalon Temperature",
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"device_class": "temperature",
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"unit_of_measurement": "°C"
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},
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"last_changed": "2026-07-27T09:12:03.101000+00:00",
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"last_updated": "2026-07-27T09:12:03.101000+00:00"
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},
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{
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"entity_id": "sensor.thsalon_humidity",
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"state": "49.5",
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"attributes": {
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"friendly_name": "thSalon Humidity",
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"device_class": "humidity",
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"unit_of_measurement": "%"
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},
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"last_changed": "2026-07-27T09:12:03.102000+00:00",
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"last_updated": "2026-07-27T09:12:03.102000+00:00"
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},
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{
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"entity_id": "select.thsalon_temperature_unit",
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"state": "celsius",
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"attributes": {
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"friendly_name": "thSalon Temperature unit",
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"options": ["celsius", "fahrenheit"]
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},
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"last_changed": "2026-07-26T21:14:41.396310+00:00",
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"last_updated": "2026-07-26T21:14:41.396310+00:00"
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},
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{
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"entity_id": "sensor.thsypialnia_temperature",
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"state": "unavailable",
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"attributes": {
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"friendly_name": "thSypialnia Temperature",
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"device_class": "temperature"
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},
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"last_changed": "2026-07-17T15:07:11.000000+00:00",
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"last_updated": "2026-07-17T15:07:11.000000+00:00"
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},
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{
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"entity_id": "binary_sensor.0x00124b00251472ef_occupancy",
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"state": "unavailable",
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"attributes": {
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"friendly_name": "mdWejscie Occupancy",
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"device_class": "occupancy"
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},
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"last_changed": "2026-07-17T15:07:12.000000+00:00",
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"last_updated": "2026-07-17T15:07:12.000000+00:00"
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},
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{
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"entity_id": "light.salon_lampa",
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"state": "on",
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"attributes": {
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"friendly_name": "Lampa salon",
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"brightness": 180
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},
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"last_changed": "2026-07-27T18:40:00.000000+00:00",
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"last_updated": "2026-07-27T18:40:00.000000+00:00"
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},
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{
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"entity_id": "switch.tasmota_14",
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"state": "on",
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"attributes": {
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"friendly_name": "Tasmota 14"
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},
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"last_changed": "2026-03-26T04:00:00.000000+00:00",
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"last_updated": "2026-03-26T04:00:00.000000+00:00"
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},
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{
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"entity_id": "automation.klima_salon_off",
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"state": "on",
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"attributes": {
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"id": "1784804668795",
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"friendly_name": "Klima salon: wyłącz chłodzenie i osusz parownik",
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"last_triggered": "2026-07-27T19:31:00.000000+00:00",
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"mode": "single",
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"current": 0
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},
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"last_changed": "2026-07-26T21:15:19.374224+00:00",
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"last_updated": "2026-07-27T19:31:00.000000+00:00"
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},
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{
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"entity_id": "automation.mirror_on",
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"state": "on",
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"attributes": {
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"id": "1636927813132",
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"friendly_name": "Mirror ON",
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"last_triggered": "2026-07-24T04:30:00.102503+00:00",
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"mode": "single",
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"current": 0
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},
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"last_changed": "2026-07-26T21:15:19.375401+00:00",
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"last_updated": "2026-07-26T21:15:19.375401+00:00"
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},
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{
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"entity_id": "automation.only_on_instance",
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"state": "off",
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"attributes": {
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"id": "9999999999999",
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"friendly_name": "Created in the UI, never imported",
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"mode": "single",
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"current": 0
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},
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"last_changed": "2026-07-26T21:15:19.376000+00:00",
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"last_updated": "2026-07-26T21:15:19.376000+00:00"
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}
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]
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