agentmods.dev

mx gen.instructions.md

A code generator that reads MusicXML, a standard format for representing written music, and produces C++, Go, C, and JSON Schema code. It uses an intermediate model and templates to create the output.

In plain words
What is it for?
Use it to change the generator, its templates, or its MusicXML model, then regenerate and check the resulting C++, Go, C, and JSON Schema files.
Why use it?
It keeps generated code consistent across several programming languages and makes the MusicXML source the basis for changes. Its rules help prevent hand-edited generated files, hidden template logic, and unnoticed differences between source and output.

Instructions file for GitHub Copilot

93 3d ago A scan 298 tokens original MIT
View the source file webern/mx
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/webern/mx/gen
Clone the repo
git clone --depth 1 https://github.com/webern/mx

Made for: GitHub Copilot.

Per session 298 This file is loaded in full into every session.
When invoked 298 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 $0.00298 $0.00298
Opus 5 $0.00149 $0.00149
Sonnet 5 $0.00060 $0.00060
Haiku 4.5 $0.00030 $0.00030

Measured 2d ago against content hash 0122706193a5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mx gen.instructions.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 2d 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.

.github/instructions/gen.instructions.md · 23 lines

What it actually says

gen/ is a Python code generator (XSD -> IR -> Plates -> Mustache press) with four targets: C++ (gen/cpp, the product), Go, C, JSON Schema. Review against its cardinal rules (gen/AGENTS.md):

  • Language-agnosticism: no language knowledge in any *.py outside a target's own directory. Reject language tables, per-language branches, or target-name checks in generator Python; language facts belong in the target's config.toml and templates/.
  • The IR is a pure function of the XSD: no configurable knobs in gen/ir/ (the sounds.xml fold is the one documented exception).
  • Templates stay dumb: naming/structural decisions belong in Plates or press context, not in template text. The Mustache engine has no expressions or filters -- reject attempts to add logic to it.
  • Fail loud: new error paths must exit non-zero with a template:line style message, never emit best-effort output.
  • Generated output is committed: a generator change without its regenerated output (or vice versa) fails the CI drift check (make gen then git diff --exit-code).
  • Template identifiers must be unity-build safe: use {{ident}}-suffixed names for file-local symbols.
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. 2d ago First seen · 23 lines · 298 tokens per session scan A 0122706193a5

Subscribe to this mod's changes

mx gen.instructions.md is an instructions file published in the GitHub repository webern/mx (93 stars, last pushed 3d ago), licensed MIT. It adds 298 tokens to every session, about $0.0015 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.

Creative and mediaData and AILanguagesc-plus-plusmusicmusic-notationmusicxmlxmlxml-dom
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