What is midi-scene-creator?

A guide for creating MIDI scenes, sequences, and music-driven visualisations in Irreden Engine. MIDI is a standard way for software and musical hardware to exchange notes and control messages.

Use it to connect MIDI hardware, generate musical sequences, respond to contact or timed events, and build visuals driven by music.

It explains how incoming and outgoing MIDI moves through the engine, including triggers, delays, and hardware output.

How jakildev/IrredenEngine configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to jakildev/IrredenEngine. 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/jakildev/IrredenEngine/master/.claude/skills/midi-scene-creator/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/jakildev/IrredenEngine

Made for: Claude Code.

Wrote this? Show the measurements

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README.md

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Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,436 The whole file, excluding the scripts and references it only reads on demand.

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	$0.00081	$0.01436
Opus 5.5	$0.00032	$0.00574
Sonnet 5.5	$0.00016	$0.00287
Haiku 4.5	$0.00008	$0.00144

Measured 2d ago against content hash 634bf7bf23fc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

midi-scene-creator 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.

.claude/skills/midi-scene-creator/SKILL.md · 129 lines

How it starts

The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MIDI Scene Creator

MIDI flows through the ECS: components carry note / sequence data, systems route messages to hardware through ephemeral entities that live one frame. Component catalog, entity builders, and gotchas: engine/prefabs/irreden/audio/CLAUDE.md.

C_MidiNote / C_MidiSequence (on game entities)
        |
Trigger system (CONTACT_MIDI_TRIGGER, PERIODIC_IDLE_MIDI_TRIGGER, MIDI_SEQUENCE_OUT)
        |
Ephemeral entity: C_MidiMessage + C_MidiOut + C_Lifetime{1}
        |
OUTPUT_MIDI_MESSAGE_OUT --> IRAudio::sendMidiMessage --> hardware

Systems

System	Pipeline	Purpose
`INPUT_MIDI_MESSAGE_IN`	INPUT	Routes inbound MIDI from hardware into `IRAudio` buffers
`OUTPUT_MIDI_MESSAGE_OUT`	UPDATE	Sends `C_MidiMessage` entities tagged `C_MidiOut` to hardware
`MIDI_SEQUENCE_OUT`	UPDATE	Advances `C_MidiSequence` tick counters, spawns outbound message entities
`MIDI_DELAY_PROCESS`	UPDATE	Spawns a delayed message as an outbound entity when its countdown expires
`CONTACT_MIDI_TRIGGER`	UPDATE	On contact enter, fires NOTE_ON and schedules NOTE_OFF via delay
`PERIODIC_IDLE_MIDI_TRIGGER`	UPDATE	On periodic-idle cycle completion, fires NOTE_ON and schedules NOTE_OFF

Minimal output pipeline — LIFETIME last, so ephemeral message entities are reaped after they send (pipeline order: engine/system/CLAUDE.md §Pipelines):

IRSystem::registerPipeline(
    IRTime::Events::UPDATE,
    {// ... other update systems ...
     IRSystem::createSystem<IRSystem::MIDI_SEQUENCE_OUT>(),
     IRSystem::createSystem<IRSystem::MIDI_DELAY_PROCESS>(),
     IRSystem::createSystem<IRSystem::OUTPUT_MIDI_MESSAGE_OUT>(),
     IRSystem::createSystem<IRSystem::LIFETIME>()}
);

Scene setup

Open a port (substring match on the device name): C++ IRAudio::openPortMidiOut("OP-1");, Lua IRAudio.openMidiOut("OP-1").
Entities. Sequence-driven — C_MidiSequence(bpm, {num, den}, lengthMeasures, looping = true) (or (bpm, num, den, lengthMeasures, looping)); insertNote(startMeasures, holdSeconds, note, velocity) with 0.0 = beat 1 of measure 1 and 1.0 = beat 1 of measure 2; getNextMessage() yields std::optional<C_MidiMessage> as ticks advance; reset() rewinds; resolution kTicksPerWholeNote = 480 * 4:

Read the full file on GitHub · 129 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.

2d ago First seen · 129 lines · 81 tokens per session scan A 634bf7bf23fc

Subscribe to this mod's changes

midi-scene-creator is a skill published in the GitHub repository jakildev/IrredenEngine (10 stars, last pushed today), licensed MIT. It adds 81 tokens to every session and 1,436 once invoked, about $0.0003 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 2026-11-07.

Creative and media Game development

midi-scene-creator next to 6 skills from other repositories
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IrredenEngine: Skill for Claude Code