list_sessions

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List tmux sessions (terminal workspaces) on a tmux server.

Use for tmux multiplexer sessions — ‘this session’, ‘my workspace’, ‘the dev session’ — not login sessions or HTTP sessions. The starting point for discovery — call this before targeting specific sessions, windows, or panes.

All Python tools · JSON · Source

Arguments

filters optional: Django-style filters as a dict (e.g. ``{"session_name__contains": "dev"}``) or as a JSON string. Some MCP clients require the string form.
Default: null.
socket_name optional: tmux socket name. Defaults to LIBTMUX_SOCKET env var.
Default: null.

Schemas

The schema defines required fields, nested values, defaults, and validation constraints.

Input schema

{
  "additionalProperties": false,
  "properties": {
    "filters": {
      "anyOf": [
        {
          "additionalProperties": {
            "type": "string"
          },
          "type": "object"
        },
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "default": null,
      "description": "Django-style filters as a dict (e.g. ``{\"session_name__contains\": \"dev\"}``)\nor as a JSON string. Some MCP clients require the string form."
    },
    "socket_name": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "default": null,
      "description": "tmux socket name. Defaults to LIBTMUX_SOCKET env var."
    }
  },
  "type": "object"
}

Output schema

{
  "properties": {
    "result": {
      "items": {
        "description": "Serialized tmux session.",
        "properties": {
          "active_pane_id": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "description": "Pane id (``%N``) of the session's active pane. Guaranteed non-None on ``create_session`` return (libtmux creates the session with one initial pane). May be None from ``list_sessions`` rows for sessions in transient teardown states where ``active_pane`` is unavailable."
          },
          "session_attached": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "description": "Attached client count"
          },
          "session_created": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "description": "Creation timestamp"
          },
          "session_id": {
            "description": "Session ID (e.g. '$1')",
            "type": "string"
          },
          "session_name": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "description": "Session name"
          },
          "window_count": {
            "description": "Number of windows",
            "type": "integer"
          }
        },
        "required": [
          "session_id",
          "window_count"
        ],
        "type": "object"
      },
      "type": "array"
    }
  },
  "required": [
    "result"
  ],
  "type": "object",
  "x-fastmcp-wrap-result": true
}

Tool annotations

{
  "destructiveHint": true,
  "idempotentHint": false,
  "openWorldHint": true,
  "readOnlyHint": false
}