A tool for controlling interactive command-line programs running inside tmux, a terminal session manager that keeps programs running in separate panes.

Use it with interactive CLIs, long-running terminal sessions, and programs that need ongoing monitoring.

It allows an agent to send keystrokes and read terminal output when a normal one-shot command is not enough.

tmux — Skill for Claude Code and Codex by mosaxiv: A tool for controlling interactive command-line programs running inside…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/mosaxiv/clawlet/tmux

Any agent

npx skills add mosaxiv/clawlet --skill tmux

Clone the repo

git clone --depth 1 https://github.com/mosaxiv/clawlet

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/mosaxiv/clawlet/tmux.svg)](https://agentmods.dev/skills/mosaxiv/clawlet/tmux)

Your own site

<a href="https://agentmods.dev/skills/mosaxiv/clawlet/tmux"><img src="https://agentmods.dev/badge/skills/mosaxiv/clawlet/tmux.svg" alt="Measured on agentmods" height="20"></a>

Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,276 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin 81% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00022	$0.01276
Opus 5	$0.00011	$0.00638
Sonnet 5	$0.00004	$0.00255
Haiku 4.5	$0.00002	$0.00128

Measured 5d ago against content hash b4345ecc37b2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

tmux scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/find-sessions.sh, scripts/wait-for-text.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

81% identical to tmux — 14 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/builtin/skills/tmux/SKILL.md · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.

tmux Skill

Use tmux only when you need an interactive TTY. Prefer exec background mode for long-running, non-interactive tasks.

Quickstart (isolated socket, exec tool)

SOCKET_DIR="${CLAWLET_TMUX_SOCKET_DIR:-${TMPDIR:-/tmp}/clawlet-tmux-sockets}"
mkdir -p "$SOCKET_DIR"
SOCKET="$SOCKET_DIR/clawlet.sock"
SESSION=clawlet

tmux -S "$SOCKET" new -d -s "$SESSION" -n shell
tmux -S "$SOCKET" send-keys -t "$SESSION":0.0 -- 'PYTHON_BASIC_REPL=1 python3 -q' Enter
tmux -S "$SOCKET" capture-pane -p -J -t "$SESSION":0.0 -S -200

After starting a session, always print monitor commands:

To monitor:
  tmux -S "$SOCKET" attach -t "$SESSION"
  tmux -S "$SOCKET" capture-pane -p -J -t "$SESSION":0.0 -S -200

Socket convention

Use CLAWLET_TMUX_SOCKET_DIR environment variable.
Default socket path: "$CLAWLET_TMUX_SOCKET_DIR/clawlet.sock".

Targeting panes and naming

Target format: session:window.pane (defaults to :0.0).
Keep names short; avoid spaces.
Inspect: tmux -S "$SOCKET" list-sessions, tmux -S "$SOCKET" list-panes -a.

Finding sessions

List sessions on your socket: {baseDir}/scripts/find-sessions.sh -S "$SOCKET".
Scan all sockets: {baseDir}/scripts/find-sessions.sh --all (uses CLAWLET_TMUX_SOCKET_DIR).

Sending input safely

Prefer literal sends: tmux -S "$SOCKET" send-keys -t target -l -- "$cmd".
Control keys: tmux -S "$SOCKET" send-keys -t target C-c.

Watching output

Capture recent history: tmux -S "$SOCKET" capture-pane -p -J -t target -S -200.
Wait for prompts: {baseDir}/scripts/wait-for-text.sh -t session:0.0 -p 'pattern'.
Attaching is OK; detach with Ctrl+b d.

Spawning processes

For python REPLs, set PYTHON_BASIC_REPL=1 (non-basic REPL breaks send-keys flows).

Windows / WSL

tmux is supported on macOS/Linux. On Windows, use WSL and install tmux inside WSL.
This skill is gated to darwin/linux and requires tmux on PATH.

Orchestrating Coding Agents (Codex, Claude Code)

Read the full file on GitHub · 122 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

5d ago First seen · 122 lines · 22 tokens per session scan A b4345ecc37b2

Subscribe to this mod's changes

tmux is a skill published in the GitHub repository mosaxiv/clawlet (326 stars, last pushed 5mo ago), licensed MIT. It adds 22 tokens to every session and 1,276 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 81% identical to tmux, differing in 14 lines, and is treated as a copy.

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