What is sublayer CLAUDE.md?

Repository instructions for Sublayer, a Ruby library and command-line tool for building applications that use AI providers such as OpenAI, Claude, and Gemini. They cover setup, testing, building, releasing, and the project's main building blocks.

Use them when developing, testing, packaging, releasing, or extending Sublayer applications and commands.

They give contributors the commands and design context needed to make changes without breaking the gem or its command-line interface.

How sublayerapp/sublayer configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to sublayerapp/sublayer. 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/sublayerapp/sublayer/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/sublayerapp/sublayer

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/sublayerapp/sublayer/claude-md/github.svg)](https://agentmods.dev/instructions/sublayerapp/sublayer/claude-md)

Your own site

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

Per session 759 This file is loaded in full into every session.

When invoked 759 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	$0.00759	$0.00759
Opus 5.5	$0.00304	$0.00304
Sonnet 5.5	$0.00152	$0.00152
Haiku 4.5	$0.00076	$0.00076

Measured 2mo ago against content hash cdb5f390002d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sublayer 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 · 83 lines

How it starts

The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

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

Project Overview

Sublayer is a Ruby gem and CLI framework for building AI-powered applications. It provides base classes for Generators, Actions, Tasks, and Agents that work with multiple AI providers (OpenAI, Claude, Gemini).

Development Commands

# Setup
bin/setup                    # Install dependencies and configure dummy API keys
bundle install              # Install gem dependencies

# Testing
rake spec                   # Run RSpec test suite
rake                        # Default task (runs specs)

# Building and releasing
rake build                  # Build gem package
rake install               # Install gem locally
rake release               # Release to RubyGems

# CLI usage (after install)
sublayer new PROJECT_NAME --template=[CLI|GithubAction|QuickScript] --provider=[OpenAI|Claude|Gemini]
sublayer generate:generator  # Generate new Generator class
sublayer generate:agent     # Generate new Agent class
sublayer generate:action    # Generate new Action class

Architecture

The framework is built around four core concepts:

Generators (lib/sublayer/generators/base.rb) - Generate specific outputs based on input data
Actions (lib/sublayer/actions/base.rb) - Perform operations to get inputs or use generated outputs
Agents (lib/sublayer/agents/base.rb) - Autonomous entities with triggers and goal conditions
Tasks (lib/sublayer/tasks/base.rb) - Task management components

AI Provider System: The framework supports multiple AI providers through a unified interface:

OpenAI (default: gpt-4o) - lib/sublayer/providers/open_ai.rb
Claude (Anthropic) - lib/sublayer/providers/claude.rb
Gemini (Google, beta) - lib/sublayer/providers/gemini.rb

Provider configuration is done via:

Sublayer.configuration.ai_provider = Sublayer::Providers::Claude
Sublayer.configuration.ai_model = "claude-3-5-sonnet-20240620"

Read the full file on GitHub · 83 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.

2mo ago First seen · 83 lines · 759 tokens per session scan A cdb5f390002d

Subscribe to this mod's changes

sublayer CLAUDE.md is an instructions file published in the GitHub repository sublayerapp/sublayer (206 stars, last pushed 1y ago), licensed MIT. It adds 759 tokens to every session, about $0.0030 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.

Building agents Languages Ruby agents ai ai-agents ai-agents-framework dsl

sublayer CLAUDE.md next to 6 instructions from other repositories
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sublayer: Instructions file for Claude Code