What is ga CLAUDE.md?

Claude Code instructions for Guitar Alchemist, covering the project’s .NET and React codebase, architecture, build commands, tests, and verification rules.

Building and testing the application, starting services, running focused tests, and keeping changes within the project’s architecture.

They help an agent follow the project’s existing structure and verify changes with the checks the repository requires.

How GuitarAlchemist/ga configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to GuitarAlchemist/ga. 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/GuitarAlchemist/ga/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/GuitarAlchemist/ga

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/guitaralchemist/ga/claude-md.svg)](https://agentmods.dev/instructions/guitaralchemist/ga/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/guitaralchemist/ga/claude-md"><img src="https://agentmods.dev/badge/instructions/guitaralchemist/ga/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 4,159 This file is loaded in full into every session.

When invoked 4,159 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 94% copy Near-identical to another mod 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	$0.04159	$0.04159
Opus 5	$0.02080	$0.02080
Sonnet 5	$0.00832	$0.00832
Haiku 4.5	$0.00416	$0.00416

Measured 4d ago against content hash 9d9a04a5b891, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

ga 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.

Origin

This is a copy

94% identical to ga AGENTS.md — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 193 lines

How it starts

The opening of the file, as written. The whole thing — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Guitar Alchemist — .NET 10 / C# 14 + F# DSL + React frontend, Aspire orchestrated.

Note: AGENTS.md is auto-synced from this file by Scripts/sync-agents-md.ps1 (also called from .githooks/pre-commit). Edit CLAUDE.md; never edit AGENTS.md directly.

Build, test, verify

dotnet build AllProjects.slnx -c Debug                    # full build
dotnet test  AllProjects.slnx                             # full suite
pwsh Scripts/start-all.ps1 -Dashboard                     # start all services via Aspire
pwsh Scripts/start-all.ps1 -NoBuild -Dashboard            # daily dev restart (skip build)
pwsh Scripts/run-all-tests.ps1 -BackendOnly -SkipBuild    # backend-only suite (faster)
dotnet test --filter "FullyQualifiedName~<name>"           # single test

Verify before claiming success. dotnet build AllProjects.slnx -c Debug and dotnet test AllProjects.slnx must pass. Frontend: npm run build && npm run lint in ReactComponents/ga-react-components.

Architecture

Strict bottom-up five-layer model:

Core — GA.Core, GA.Domain.Core (pure primitives: Note, Interval, Fretboard)
Domain — GA.Business.Core, GA.Business.Config, GA.BSP.Core (logic, YAML, BSP)
Analysis — GA.Business.Core.Harmony, GA.Business.Core.Fretboard (chord/scale, voice leading, spectral)
AI/ML — GA.Business.ML (embeddings, vector search, RAG, OPTIC-K schema)
Orchestration — GA.Business.Core.Orchestration, GA.Business.Assets, GA.Business.Intelligence

Rule: AI code in layer 4 (GA.Business.ML). Orchestration in layer 5. Never in lower layers. Full layer map + conventions: docs/architecture/layers.md.

Apps live in Apps/: ga-server/GaApi (ASP.NET + SignalR + GraphQL), GaChatbot, ga-client (React + R3F), GaMusicTheoryLsp (F#), AllProjects.AppHost (Aspire).

Conventions

C# 14 / .NET 10: <Nullable>enable</Nullable>, file-scoped namespaces with using inside, record for DTOs, primary constructors, [] collection expressions, System.Threading.Lock, zero-warnings policy.
Railway-Oriented Programming: Services return Result<T,E> / Try<T> / Validation<T> / Option<T> from GA.Core.Functional. throw only at system boundaries.
F# (GA.Business.DSL, GA.Business.Config): 4-space indent, [<CLIMutable>] on YAML records, PascalCase YAML keys, hardcoded fallback if YAML missing.
Frontend: React 18, TypeScript strict, MUI v5 (sx prop only), R3F (no state in useFrame), no any.

Read the full file on GitHub · 193 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.

4d ago First seen · 193 lines · 4,159 tokens per session scan A 9d9a04a5b891

Subscribe to this mod's changes

ga CLAUDE.md is an instructions file published in the GitHub repository GuitarAlchemist/ga (2 stars, last pushed yesterday), licensed MIT. It adds 4,159 tokens to every session, about $0.0208 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to ga AGENTS.md, differing in 4 lines, and is treated as a copy.

codex AGENTS.md

AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

openai/codex · 5,182 tokens

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 6,785 tokens

ga: Instructions file for Claude Code