List all devices with their channels, types, and addresses. Optional filters: room, function, type, name. Use this first to discover device addresses for get_value/set_value.

List available communication interfaces (BidCos-RF, HmIP-RF, VirtualDevices, etc.).

List all rooms with their assigned channel IDs. Use with list_devices to find devices by room.

List all function groups (Heating, Lighting, etc.) with their assigned channel IDs.

List all automation programs. Use execute_program to trigger them.

List all system variables with current values and metadata. Use set_system_variable to modify them.

Get the full channel/datapoint schema for a device type (e.g. 'HmIP-eTRV-2'). Shows all channels, paramsets, datapoint names, types, ranges, and operations. Served from cache (instant). Use list_devices first to find device types.

List direct device links (Direktverknüpfungen) — sender→receiver channel pairings that operate independently of the CCU (e.g. a wall switch directly driving a lamp, or thermostats linked to a FALMOT). Read-only. Optionally filter to links involving a specific device or channel address.

Read a single datapoint value from a device channel. Only address and valueKey are required — interface is auto-resolved. Use list_devices to find addresses, describe_device_type to find valid valueKeys.

Read datapoint values for multiple channels at once via HM Script. Provide either a list of channel addresses, or filter by room or function name.

Read all parameters for a channel (VALUES, MASTER, or LINK). Interface is auto-resolved from the address.

Set a single datapoint value on a device channel. Only address, valueKey, and value are required — interface and type are auto-resolved. Returns the previous value for undo. Use describe_device_type to find valid valueKeys and ranges.

Write multiple parameters at once (e.g. thermostat weekly profile). Interface is auto-resolved from address.

Set a system variable value. Type is auto-detected — use list_system_variables to see available variables.

Create a new system variable. Types: 'bool', 'float' (optional min/max/unit), 'enum' (requires values list), 'string'. Use set_system_variable to write it afterwards, list_system_variables to see existing ones.

Delete a system variable by name. Use list_system_variables to see existing names.

Trigger an automation program on the CCU. NOT idempotent — will not be auto-retried. Use list_programs to find program IDs.

Assign a channel to a room and/or a function group. Identify the channel by address and the room/function by name (use list_rooms / list_functions to see names). At least one of room or function is required.

Remove a channel from a room and/or a function group. Identify the channel by address and the room/function by name (use list_rooms / list_functions to see names). At least one of room or function is required.

Get all active service messages (low battery, unreachable, etc.) with device details and timestamps.

Confirm/dismiss active service messages (e.g. clear a low-battery or unreachable warning). Provide an alarm id (from get_service_messages) to confirm one message, or a channel address to confirm all active messages on that channel. A warning reappears if its condition persists.

Get CCU system information: firmware version, serial number, addresses.

Report radio link quality (RSSI, in dBm) for every device, resolved to device names, plus BidCos interface health (duty cycle, connected state). Covers both transports: BidCos-RF via Interface.rssiInfo, and HmIP-RF via each device's RSSI_DEVICE/RSSI_PEER maintenance datapoints. Use to answer 'why is this sensor flaky?'. Higher (closer to 0) dBm is better; null = no measurement.

Context-aware help. No args: conceptual guide. Tool name (e.g. 'set_value'): tool usage. Device type (e.g. 'HmIP-eTRV-2'): capabilities from cache.

Execute arbitrary HomeMatic Script on the CCU. NOT idempotent — will not be auto-retried. Use for anything the other tools don't cover.