session

session is a command for Claude Code from MadAppGang/magus. It costs 19 tokens per session (959 once invoked), scanned A, original, MIT.

A command for creating, listing, and closing terminal sessions, including tmux and headless sessions. A headless session runs without needing its own visible terminal window.

In plain words
What is it for?
It helps create project terminal sessions, inspect active panes, and close headless sessions after work is complete.
Why use it?
It provides manual control over terminal processes when automatic session management is not enough. It also helps find active sessions and avoid leaving unwanted ones running.

Command for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: positional $N argument.

Part of the terminal plugin — 5 skills, 7 commands, 1 agent shipped together

Good fit It helps create project terminal sessions, inspect active panes, and close headless…

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Install with agentmods
npx agentmods add commands/madappgang/magus/session
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.

Clone the repo
git clone --depth 1 https://github.com/MadAppGang/magus

Made for: Claude Code.

Or install terminal, the plugin that ships this one along with the rest of its 5 skills, 7 commands, 1 agent.

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 session

README.md
[![agentmods](https://agentmods.dev/badge/commands/madappgang/magus/session.svg)](https://agentmods.dev/commands/madappgang/magus/session)
Your own site
<a href="https://agentmods.dev/commands/madappgang/magus/session"><img src="https://agentmods.dev/badge/commands/madappgang/magus/session.svg" alt="Measured on agentmods" height="20"></a>
Per session 19 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 959 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.
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 $0.00019 $0.00959
Opus 5 $0.00010 $0.00479
Sonnet 5 $0.00004 $0.00192
Haiku 4.5 $0.00002 $0.00096

Measured 2d ago against content hash 82cd109e697d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

session 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.

plugins/terminal/commands/session.md · 145 lines

How it starts

The opening of the file, as written. The whole thing — 145 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/terminal:session

Advanced command — For most tasks, use /terminal:run, /terminal:watch, or /terminal:repl instead. They handle session lifecycle automatically. Use this command only when you need manual control over sessions.

Create, list, and manage terminal sessions using tmux-mcp.

Usage

/terminal:session list
/terminal:session tmux list
/terminal:session tmux create {name}
/terminal:session headless create
/terminal:session headless close {paneId}
/terminal:session headless close-all

Subcommands

list — Show all active sessions

/terminal:session list

Lists all active tmux sessions (both regular and headless) with their pane IDs and metadata.

Use this to:

  • Find a pane ID when you've forgotten it
  • Check for orphaned headless sessions to clean up
  • Verify a session was closed successfully

tmux list — List tmux sessions

/terminal:session tmux list

Lists all active tmux sessions with their windows and panes. This shows the developer's existing tmux environment — do not kill these sessions.

tmux create — Create a tmux session

/terminal:session tmux create myproject

Creates a new named tmux session. tmux sessions are visible to the user and can be attached to from their terminal.

headless create — Create a headless session

/terminal:session headless create

Creates an isolated headless session for running a command invisibly.

mcp__tmux__create-headless({ name: "my-task" }) → { paneId: "headless:%0" }

headless close — Close a headless session

/terminal:session headless close headless:%0

Kills a specific headless session and releases its resources.

mcp__tmux__kill-session({ sessionId: "headless:$0" })

Always close sessions when you are done with them.

headless close-all — Close all headless sessions

/terminal:session headless close-all

Terminates all headless sessions at once.

mcp__tmux__kill-headless-server()

Useful for bulk cleanup after a long workflow.

Read the full file on GitHub · 145 lines

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 · 145 lines · 19 tokens per session scan A 82cd109e697d

Subscribe to this mod's changes

session is a command published in the GitHub repository MadAppGang/magus (9 stars, last pushed 2d ago), licensed MIT. It adds 19 tokens to every session and 959 once invoked, about $0.0001 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 2026-09-04.