Use them when building the Go program, creating its Docker image, running debug mode, or changing its command-line and platform-specific components.

They give a coding agent the repository's expected commands and architecture. This helps it work within the project's platform-specific code and dependency setup.

How STRRL/shell-now configures Claude Code

Q: What is shell-now CLAUDE.md?

Project instructions for Shell Now, a Go command-line tool that creates public web terminals using ttyd and Cloudflare Quick Tunnels. They describe how to build, run, test, and structure the project.

Reuse

Borrowing it

Nothing to install: this file belongs to STRRL/shell-now. 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/STRRL/shell-now/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/STRRL/shell-now

Made for: Claude Code.

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/instructions/strrl/shell-now/claude-md/github.svg)](https://agentmods.dev/instructions/strrl/shell-now/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/strrl/shell-now/claude-md"><img src="https://agentmods.dev/badge/instructions/strrl/shell-now/claude-md/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/instructions/strrl/shell-now/claude-md"><img src="https://agentmods.dev/badge/instructions/strrl/shell-now/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 497 This file is loaded in full into every session.

When invoked 497 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.

Model	Per session	Once invoked
Fable 5.1	$0.00497	$0.00497
Opus 5.5	$0.00199	$0.00199
Sonnet 5.5	$0.00099	$0.00099
Haiku 4.5	$0.00050	$0.00050

Measured 2mo ago against content hash 4b3773d7df02, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

shell-now CLAUDE.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 2mo 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.

CLAUDE.md · 44 lines

What it actually says

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

Shell Now is a Go CLI tool that creates instant public web terminals using ttyd and Cloudflare Quick Tunnels. The tool automatically downloads required dependencies (ttyd and cloudflared) and sets up a secure web-based shell accessible via a public URL.

Build Commands

make build or go build -o out/shell-now ./cmd/shell-now/ - Build the binary
DEBUG=1 ./out/shell-now - Run with debug logging enabled
docker build -t shell-now . - Build Docker image
docker run cr.strrl.dev/strrl/shell-now:latest - Run via Docker

Architecture

The codebase follows a simple CLI pattern with platform-specific implementations:

Core Components

cmd/shell-now/main.go - CLI entry point using Cobra, handles signals and context
pkg/bootstrap.go - Main orchestration logic that coordinates ttyd and cloudflared processes
Platform-specific preparation files (prepare_linux.go, prepare_darwin.go, prepare.go) that handle dependency installation

Key Architecture Points

Uses build tags for platform-specific code (//go:build !darwin && !linux)
Linux/ARM64 support with automatic binary downloads to ~/.local/bin/
macOS requires manual installation via Homebrew
Concurrent goroutines for ttyd and cloudflared with WaitGroup synchronization
Context-based cancellation for graceful shutdown on SIGINT/SIGTERM
Random port allocation for ttyd using net.Listen("tcp", ":0")
Random 6-digit password generation for web terminal authentication

Dependencies

Uses github.com/spf13/cobra for CLI framework
Downloads ttyd v1.7.7 and cloudflared 2025.5.0 on Linux
Expects ttyd and cloudflared via Homebrew on macOS

Platform Considerations

The tool has different behavior per platform:

Linux: Automatically downloads binaries to ~/.local/bin/ if not in PATH
macOS: Requires manual installation via brew install ttyd cloudflared
Other platforms: Requires manual installation with informational messages only

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 · 44 lines · 497 tokens per session scan A 4b3773d7df02

Subscribe to this mod's changes

shell-now CLAUDE.md is an instructions file published in the GitHub repository STRRL/shell-now (48 stars, last pushed 1y ago), licensed MIT. It adds 497 tokens to every session, about $0.0020 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.

Cloud DevOps and cloud cloudflare cloudflare-tunnel devtools ttyd web-terminal webshell

shell-now CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
shell-now CLAUDE.mdSTRRL/shell-now	Instructions file	48	1y ago	MIT	A	497	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

shell-now: Instructions file for Claude Code