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claudetainer CLAUDE.md

claudetainer CLAUDE.md is an instructions file for coding agents from smithclay/claudetainer. It costs 884 tokens per session, scanned A, original, MIT.

A project instruction file for Claudetainer, a development-container feature that adds language support to Claude Code through hooks, commands, sub-agents, and presets.

In plain words
What is it for?
Use it when developing, formatting, linting, testing, building, or validating Claudetainer and its command-line tools.
Why use it?
It documents the required development cycle and validation commands, so changes can be checked against the project's expected behaviour before they are committed.

Instructions file

not rated 107 5mo ago A scan 884 tokens original MIT
View the source file smithclay/claudetainer
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 instructions/smithclay/claudetainer/claude-md
Clone the repo
git clone --depth 1 https://github.com/smithclay/claudetainer

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.

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README.md
[![agentmods](https://agentmods.dev/badge/instructions/smithclay/claudetainer/claude-md.svg)](https://agentmods.dev/instructions/smithclay/claudetainer/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/smithclay/claudetainer/claude-md"><img src="https://agentmods.dev/badge/instructions/smithclay/claudetainer/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 884 This file is loaded in full into every session.
When invoked 884 The same file — it is already loaded in full.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00884 $0.00884
Opus 5 $0.00442 $0.00442
Sonnet 5 $0.00177 $0.00177
Haiku 4.5 $0.00088 $0.00088

Measured 4d ago against content hash 35bac6ed03da, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

claudetainer 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 4d 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 · 118 lines

How it starts

The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides focused development guidance for Claude Code when working with this repository.

Claudetainer Development

Claudetainer is a devcontainer feature that adds language-specific support to Claude Code through automated hooks, commands, sub-agents, and presets.

See docs/ for complete architecture, installation, and usage documentation

Essential Development Commands

IMPORTANT: ALWAYS run development checks before committing:

make dev        # Quick check: lint + test-cli (recommended for regular dev)
make test       # Full test suite: CLI + DevContainer features + lifecycle
make check      # Comprehensive: lint + test + build (pre-commit)
make lint       # Linting: shellcheck + shfmt + scripts + JSON
make fmt        # Format all shell scripts

Testing workflow:

# Quick development cycle
./bin/claudetainer --version    # Test modular CLI
make dev                        # Run lint + CLI tests

# Full validation
make test                       # All tests (CLI + feature + lifecycle)
make build                      # Build single-file distribution
./dist/claudetainer --version   # Test built CLI

YOU MUST run make dev successfully before any commit.

Key Project Structure

Core Files:

  • bin/claudetainer - Modular CLI development version (143 lines)
  • dist/claudetainer - Built single-file distribution (1,435 lines)
  • build.sh - Build script (modular → single-file)
  • Makefile - Development automation and testing
  • src/claudetainer/install.sh - DevContainer feature installation

Important Directories:

  • bin/lib/ - CLI library modules (8 core functions)
  • bin/commands/ - CLI command implementations
  • src/claudetainer/presets/ - Language-specific configurations with sub-agents
  • src/claudetainer/multiplexers/ - Terminal multiplexer support
  • test/claudetainer/ - DevContainer feature tests
  • docs/ - Complete documentation

Development Standards

Code Style:

  • Use rg instead of grep, fd instead of find
  • Graceful degradation when tools missing
  • Shell scripts must pass shellcheck and shfmt formatting
  • JSON files must be valid

Read the full file on GitHub · 118 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. 4d ago First seen · 118 lines · 884 tokens per session scan A 35bac6ed03da

Subscribe to this mod's changes

claudetainer CLAUDE.md is an instructions file published in the GitHub repository smithclay/claudetainer (107 stars, last pushed 5mo ago), licensed MIT. It adds 884 tokens to every session, about $0.0044 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.

claude-codedevcontainer-feature
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