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ga: Instructions file for Codex

AGENTS.md

ga AGENTS.md is an instructions file for Codex, OpenCode from GuitarAlchemist/ga. It costs 4,429 tokens per session, scanned A, original, MIT.

Repository instructions for Guitar Alchemist, covering its .NET and React codebase, architecture, build commands, tests, and verification rules.

In plain words
What is it for?
Building and testing the application, starting its services, running targeted checks, and keeping code within the project’s architecture.
Why use it?
They help an agent follow the project’s existing structure and check changes correctly before claiming that work is complete.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions Claude Code.

This is GuitarAlchemist/ga's own configuration. It tells Codex and OpenCode how to work on ga itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything ga configures →

not rated 2repo changed 1mo ago A scan 4,429 tokens original MIT
View source ↗ GuitarAlchemist/ga
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/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/GuitarAlchemist/ga

Made for: Codex, OpenCode.

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 ga AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/guitaralchemist/ga/agents-md/github.svg)](https://agentmods.dev/instructions/guitaralchemist/ga/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/guitaralchemist/ga/agents-md"><img src="https://agentmods.dev/badge/instructions/guitaralchemist/ga/agents-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.

agentmods 80×15 button for ga AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/guitaralchemist/ga/agents-md"><img src="https://agentmods.dev/badge/instructions/guitaralchemist/ga/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 4,429 This file is loaded in full into every session.
When invoked 4,429 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.04429 $0.04429
Opus 5.5 $0.01772 $0.01772
Sonnet 5.5 $0.00886 $0.00886
Haiku 4.5 $0.00443 $0.00443

Measured 1mo ago against content hash d87f92263b1b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ga AGENTS.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 1mo 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

Copies of this mod

1 near-identical copy found in the catalogue:

AGENTS.md · 207 lines

How it starts

The opening of the file, as written. The whole thing — 207 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.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). Source of truth is CLAUDE.md. This file is auto-generated — do not edit 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:

  1. Core — GA.Core, GA.Domain.Core (pure primitives: Note, Interval, Fretboard)
  2. Domain — GA.Business.Core, GA.Business.Config, GA.BSP.Core (logic, YAML, BSP)
  3. Analysis — GA.Domain.Services (chord/scale analysis, voicing generation and analysis, voice leading, spectral)
  4. AI/ML — GA.Business.ML (embeddings, vector search, RAG, OPTIC-K schema)
  5. 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 · 207 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. 1mo ago Changed · +14 lines · +237 tokens per session d87f92263b1b
  2. 1mo ago Changed · +29 tokens per session be4b76b82c91
  3. 1mo ago First seen · 193 lines · 4,163 tokens per session scan A 4f3c9fe3e522

Subscribe to this mod's changes

ga AGENTS.md is an instructions file published in the GitHub repository GuitarAlchemist/ga (2 stars, last pushed yesterday), licensed MIT. It adds 4,429 tokens to every session, about $0.0177 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 2026-09-03.

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