wait_for_channel

Block until a tmux wait-for channel is signalled.

This is the AUTHORED-output synchronisation primitive: the channel only fires because your own composed shell command signals it. Reserve wait_for_text for output you did not author.

Agents can compose this with send_keys to turn shell-side milestones into explicit synchronisation points::

send_keys(
    "pytest; tmux wait-for -S tests_done",
    pane_id=...,
)
wait_for_channel("tests_done", timeout=60)

Shell ; semantics fire wait-for -S whether the command succeeded or failed, so the edge-triggered signal never deadlocks on a crash. Do NOT chain exit $status after the signal — in an interactive shell that exits the shell itself, which destroys single-pane sessions. Exit-status preservation in interactive shells is out-of-scope; inspect the captured output for command-specific success markers.

All Python tools · JSON · Source

Arguments

channel required · string

Channel name. Must match ``^[A-Za-z0-9_.:-]{1,128}$``.

socket_name optional

tmux socket name.

Default: null.

timeout optional · number

Maximum seconds to wait. The underlying ``tmux wait-for`` has no built-in timeout — this wrapper enforces it by killing the tmux child, which also happens if the call is cancelled. Defaults to 30 seconds. Capped by the same server wait ceiling as ``wait_for_text``; an over-large value is not an error, the wait returns at the ceiling and the confirmation message names the timeout that was actually enforced.

Default: 30.

Schemas

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

{
  "additionalProperties": false,
  "properties": {
    "channel": {
      "description": "Channel name. Must match ``^[A-Za-z0-9_.:-]{1,128}$``.",
      "type": "string"
    },
    "socket_name": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "default": null,
      "description": "tmux socket name."
    },
    "timeout": {
      "default": 30,
      "description": "Maximum seconds to wait. The underlying ``tmux wait-for`` has\nno built-in timeout — this wrapper enforces it by killing the\ntmux child, which also happens if the call is cancelled.\nDefaults to 30 seconds. Capped by the same server wait ceiling\nas ``wait_for_text``; an over-large value is not an error, the\nwait returns at the ceiling and the confirmation message names\nthe timeout that was actually enforced.",
      "type": "number"
    }
  },
  "required": [
    "channel"
  ],
  "type": "object"
}

{
  "properties": {
    "result": {
      "type": "string"
    }
  },
  "required": [
    "result"
  ],
  "type": "object",
  "x-fastmcp-wrap-result": true
}

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