A workflow that starts GitHub issue work in a separate tmux window and Git worktree. tmux is a terminal tool that lets multiple sessions run at once, while a worktree is a separate working copy of a Git repository.

Use it to start a numbered GitHub issue in a new tmux window, create or reuse its worktree, launch Claude Code, and begin the issue workflow.

It lets issue work continue outside your current terminal session without mixing changes with the files you are currently editing.

tmux-start — Skill for Claude Code and Codex by gopherguides: A workflow that starts GitHub issue work in a…

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/gopherguides/gopher-ai/tmux-start

Any agent

npx skills add gopherguides/gopher-ai --skill tmux-start

Clone the repo

git clone --depth 1 https://github.com/gopherguides/gopher-ai

Made for: Claude Code, Codex.

Or install go-workflow, the plugin that ships this one along with the rest of its 11 skills, 3 commands, 4 agents, 4 hooks.

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/gopherguides/gopher-ai/tmux-start.svg)](https://agentmods.dev/skills/gopherguides/gopher-ai/tmux-start)

Your own site

<a href="https://agentmods.dev/skills/gopherguides/gopher-ai/tmux-start"><img src="https://agentmods.dev/badge/skills/gopherguides/gopher-ai/tmux-start.svg" alt="Measured on agentmods" height="20"></a>

Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 964 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00070	$0.00964
Opus 5	$0.00035	$0.00482
Sonnet 5	$0.00014	$0.00193
Haiku 4.5	$0.00007	$0.00096

Measured today against content hash 206310d9ddd5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

tmux-start 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 today.

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/go-workflow/skills/tmux-start/SKILL.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Start Issue in tmux Window

Plugin Resource Resolution

<PLUGIN_ROOT> is notation. Replace it with a concrete absolute plugin root before every resource read or command:

Codex: Start from the directory containing the absolute selected SKILL.md path, then ascend two directories (skills/<name> -> plugin root).
Claude Code: Bind it to the injected ${CLAUDE_PLUGIN_ROOT} value.

Before requesting decisions, read <PLUGIN_ROOT>/lib/driver-interaction.md and follow its cross-platform capability-binding rules.

Read <PLUGIN_ROOT>/lib/decision-gates.md before resolving target or secret-copy intent.

Bind the invocation arguments as SKILL_ARGS for $go-workflow:tmux-start by reading <PLUGIN_ROOT>/lib/skill-arguments.md with this Claude Code compatibility payload: $ARGUMENTS

Empty Arguments

If SKILL_ARGS is empty or not provided, explain:

This skill creates or reuses a worktree, opens a new tmux window, launches the active assistant surface, and sends its qualified start-issue invocation automatically.

Claude Code: /go-workflow:tmux-start <issue-number>.

Codex: $go-workflow:tmux-start <issue-number>.

Prerequisites: running inside a tmux session ($TMUX set); gh authenticated; inside a git repo.

This is a missing-intent gate. Request: "What issue number should I start in a tmux window?" If structured input is unavailable, ask in the final response and stop before creating a worktree or tmux window.

Clear Worktree State

/bin/bash "<PLUGIN_ROOT>/scripts/worktree-state.sh" clear 2>/dev/null || true

Issue Number

Use SKILL_ARGS as the issue number. The script validates that it is numeric and that the issue exists.

Environment Files

Check whether the source repo has environment files before creating the worktree:

SOURCE_DIR="$(pwd)"
/bin/bash "<PLUGIN_ROOT>/scripts/worktree-create.sh" env-files --source-dir "$SOURCE_DIR"

Read the full file on GitHub · 111 lines

Files

What ships with it

1 file 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.

agents/openai.yaml 43 B

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.

today Changed 206310d9ddd5
2d ago Changed · +27 lines 6be9ecaddddf
5d ago First seen · 84 lines · 70 tokens per session scan A ab33f364b57b

Subscribe to this mod's changes

tmux-start is a skill published in the GitHub repository gopherguides/gopher-ai (21 stars, last pushed today), licensed MIT. It adds 70 tokens to every session and 964 once invoked, about $0.0003 per session on Opus 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.

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tmux-start