Partitions

Tool Name: disks/partitions

Retrieves partition boundaries for a block device (conceptually fdisk -l), parsed natively from /sys/class/block - this daemon does not wrap the fdisk binary. Returns each partition's device name, parent disk, partition number, and start/size in both sectors and bytes. No root required.

Parameters

• device (optional) - only return partitions belonging to this disk (e.g. vda). Omit to list partitions across every disk on the system.
• output_format (optional) - json for structured output; omit for a plain text table.

Example

Every example below shows the equivalent linuxctl command and the raw MCP JSON-RPC call it resolves to. The raw call always follows the same two-step pattern (see MCP API overview for the full explanation): open an SSE stream to get a one-time POST endpoint, then POST the JSON-RPC request there - the result streams back on the SSE connection.

linuxctl

linuxctl get disks partitions vda --output json

Output (Ubuntu 24.04 VPS):

[
  {
    "device": "vda1",
    "parent_disk": "vda",
    "number": 1,
    "start_sector": 2048,
    "size_sectors": 31455232,
    "size_bytes": 16105078784
  }
]

curl (raw MCP JSON-RPC)

curl -N -s --cacert mcpd.crt -H "Authorization: Bearer $MCP_TOKEN" https://localhost:9091/sse &
# server sends: event: endpoint / data: /message?session_id=...

curl -s --cacert mcpd.crt -X POST "https://localhost:9091/message?session_id=<from step 1>" \
  -H "Authorization: Bearer $MCP_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "id": "1", "method": "tools/call", "params": {"name": "disks/partitions", "arguments": {"device": "vda", "output_format": "json"}}}'

Response:

{
  "jsonrpc": "2.0",
  "id": "1",
  "result": {
    "content": [
      {
        "type": "text",
        "text": "[\n  {\n    \"device\": \"vda1\",\n    \"parent_disk\": \"vda\",\n    \"number\": 1,\n    \"start_sector\": 2048,\n    \"size_sectors\": 31455232,\n    \"size_bytes\": 16105078784\n  }\n]"
      }
    ]
  }
}