cmux-workspace

Instructions for working safely inside the current cmux workspace and terminal. cmux is a terminal environment that can contain multiple work areas, panes, and application surfaces.

In plain words
What is it for?
Use it when automating cmux panes or surfaces, identifying the current workspace, or sending commands through the appropriate terminal connection.
Why use it?
It helps target the correct workspace and terminal surface without disrupting other active work.

Skill for Claude CodeCodex

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/basicmachines-co/basic-memory/cmux-workspace
Any agent
npx skills add basicmachines-co/basic-memory --skill cmux-workspace
Clone the repo
git clone --depth 1 https://github.com/basicmachines-co/basic-memory

Made for: Claude Code, Codex.

Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,597 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00043 $0.01597
Opus 5 $0.00022 $0.00798
Sonnet 5 $0.00009 $0.00319
Haiku 4.5 $0.00004 $0.00160

Measured 2d ago against content hash 1c8e787a74c4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

cmux-workspace 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 2d 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.

.agents/skills/cmux-workspace/SKILL.md · 117 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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.

  1. 2d ago First seen · 117 lines · 43 tokens per session scan A 1c8e787a74c4

Subscribe to this mod's changes

cmux-workspace is a skill published in the GitHub repository basicmachines-co/basic-memory (3,834 stars, last pushed today), licensed AGPL-3.0. It adds 43 tokens to every session and 1,597 once invoked, about $0.0002 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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