A tool for reading and controlling tmux, a terminal program that keeps several shells or running commands in separate panes and windows. It can work with panes showing servers, tests, logs, shells, or REPLs.

Use it to read logs, check whether a development server is running and which port it uses, drive a test watcher or REPL, and run commands in separate tmux sessions.

It lets an agent inspect and interact with processes that are already running in another terminal pane, instead of treating each command as an isolated session.

tmux — Skill for Claude Code by nicknisi/claude-plugins

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.

Any agent

npx skills add nicknisi/claude-plugins --skill tmux

Clone the repo

git clone --depth 1 https://github.com/nicknisi/claude-plugins

Made for: Claude Code.

Or install tmux, the plugin that ships this one along with the rest of its 1 skill, 1 hook.

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/nicknisi/claude-plugins/tmux/github.svg)](https://agentmods.dev/skills/nicknisi/claude-plugins/tmux)

Your own site

<a href="https://agentmods.dev/skills/nicknisi/claude-plugins/tmux"><img src="https://agentmods.dev/badge/skills/nicknisi/claude-plugins/tmux/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/nicknisi/claude-plugins/tmux"><img src="https://agentmods.dev/badge/skills/nicknisi/claude-plugins/tmux.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 124 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,382 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium MCP Rug Pull · line 112
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

How audits are shown

Origin original No closer match found 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 5.1	$0.00124	$0.03382
Opus 5.5	$0.00050	$0.01353
Sonnet 5.5	$0.00025	$0.00676
Haiku 4.5	$0.00012	$0.00338

Measured 2mo ago against content hash 6b8e9fd75dea, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 2mo ago.

The scan reads SKILL.md. This mod also ships 6 executable files (scripts/find-panes.sh, scripts/find-sessions.sh, scripts/run-in-pane.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.

plugins/tmux/skills/tmux/SKILL.md · 162 lines

How it starts

The opening of the file, as written. The whole thing — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.

tmux Skill

Use tmux as a programmable terminal multiplexer — both to drive the panes the user is already watching (their dev server, test watcher, REPL, logs) and to run your own isolated sessions. Works on Linux and macOS with stock tmux.

If you were launched from inside tmux, a SessionStart hook will already have told you so and listed the visible panes — which means Mode A below is available. When in doubt, prefer acting on the surfaces the user can actually see; that's usually what they mean.

Mode A — observe & control the user's tmux

This is the high-value mode when you're running inside the user's tmux: you can read and drive the same panes they're looking at, instead of spinning up a sandbox they can't see.

Confirm you're inside their tmux and find the server ($TMUX is socket,pid,session; the socket is the first field):

[ -n "$TMUX" ] && echo "in tmux — socket=${TMUX%%,*} pane=$TMUX_PANE"

Plain tmux ... already targets that server; tmux -S "${TMUX%%,*}" ... is the explicit form. The user usually works one window per project, so the panes sharing your window are the relevant ones. The bundled scripts cover the common operations — prefer them over hand-rolling:

./scripts/find-panes.sh -p                    # panes in YOUR window + listening ports
./scripts/find-panes.sh --session -p          # widen to the whole session

Never assume :0.0. The user's tmux may set base-index 1 / pane-base-index 1, so targets can be 1-based. Always use the exact session:win.pane reported by find-panes.sh (or the SessionStart hook, or $TMUX_PANE for your own pane).

Read a pane's output — safe, do it freely:

tmux capture-pane -p -J -t projects:1.2 -S -200   # scrape a dev server's recent log

Run a one-off in the user's shell pane and get just its output back (waits for completion, prompt-agnostic, exits with the command's code):

./scripts/run-in-pane.sh -t projects:1.3 -- pnpm vitest run src/auth

Read the full file on GitHub · 162 lines

Files

What ships with it

6 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.

2mo ago First seen · 162 lines · 124 tokens per session scan A 6b8e9fd75dea

Subscribe to this mod's changes

tmux is a skill published in the GitHub repository nicknisi/claude-plugins (114 stars, last pushed 2mo ago), licensed MIT. It adds 124 tokens to every session and 3,382 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

tmux next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
tmuxnicknisi/claude-plugins	Skill	114	2mo ago	MIT	A	124	Claude Code
imagegenopenai/codex	Skill	134k	today	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	today	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	today	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	314k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	today	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	today	MIT	A	103	Claude Code