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tmuxy: Instructions file for GitHub Copilot

.github/copilot-instructions.md

tmuxy copilot-instructions.md is an instructions file for GitHub Copilot from flplima/tmuxy. It costs 272 tokens per session, scanned A, original, MIT.

Repository-specific instructions for using GitHub Copilot with tmuxy, a web-based tmux interface. They list setup commands, project constraints, validation commands, and key documentation.

In plain words
What is it for?
Use them to bootstrap tmuxy, follow its tmux and tooling rules, and run fast, full, end-to-end, Rust, and lint checks.
Why use it?
They reduce guesswork about how to change the repository and which checks to run before finishing work.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file. Also seen: mentions AGENTS.md.

This is flplima/tmuxy's own configuration. It tells GitHub Copilot how to work on tmuxy itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything tmuxy configures →

not rated 96repo +1 changed 1mo ago A scan 272 tokens original MIT
View source ↗ flplima/tmuxy tmuxy.sh
Reuse

Borrowing it

Nothing to install: this file belongs to flplima/tmuxy. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/flplima/tmuxy/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/flplima/tmuxy

Made for: GitHub Copilot.

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.

agentmods badge for tmuxy copilot-instructions.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/flplima/tmuxy/copilot-instructions/github.svg)](https://agentmods.dev/instructions/flplima/tmuxy/copilot-instructions)
Your own site
<a href="https://agentmods.dev/instructions/flplima/tmuxy/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/flplima/tmuxy/copilot-instructions/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.

agentmods 80×15 button for tmuxy copilot-instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/flplima/tmuxy/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/flplima/tmuxy/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 272 This file is loaded in full into every session.
When invoked 272 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00272 $0.00272
Opus 5.5 $0.00109 $0.00109
Sonnet 5.5 $0.00054 $0.00054
Haiku 4.5 $0.00027 $0.00027

Measured 1mo ago against content hash e7b0baa917c5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tmuxy copilot-instructions.md 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 1mo ago.

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.

.github/copilot-instructions.md · 25 lines

What it actually says

Agent instructions for tmuxy

AGENTS.md is the instruction file for every agent, this one included. Read it: the coding rules, the tmux control-mode constraint, the test guidelines, the doc index and the commands to run before wrapping up all live there, and they are not repeated here. A copy would only be a second thing to keep current, and the copy is what goes stale.

First commands

  1. bash bin/bootstrap
  2. npm run check:fast

What is different about the Copilot cloud session

  • The environment is an ephemeral GitHub Actions runner built by .github/workflows/copilot-setup-steps.yml. .devcontainer/ does not apply here — a custom container image and devcontainer.json are not supported for this agent.
  • The tooling on top of Node, Rust and tmux comes from bin/install-dev-tools, the same list the devcontainer image installs. If something an agent needs is missing, add it there rather than to this file or the workflow.
  • The browser is agent-browser's, and PLAYWRIGHT_CHROMIUM_EXECUTABLE_PATH points the Playwright-driven suites at that same binary.
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.

  1. 1mo ago Changed · -14 lines · -99 tokens per session e7b0baa917c5
  2. 1mo ago First seen · 39 lines · 371 tokens per session scan A 442126d5a57b

Subscribe to this mod's changes

tmuxy copilot-instructions.md is an instructions file published in the GitHub repository flplima/tmuxy (96 stars, last pushed today), licensed MIT. It adds 272 tokens to every session, about $0.0011 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 2026-09-22.

FrontendLanguagesReactRustterminalterminal-emulatorterminal-multiplexertmux
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